diff --git a/.ai/AGENTS.md b/.ai/AGENTS.md
new file mode 100644
index 00000000..4e0f7496
--- /dev/null
+++ b/.ai/AGENTS.md
@@ -0,0 +1,65 @@
+# AI Agent Instructions
+
+## Project Context
+
+TanStack Time is a headless time/calendar utility library for TS/JS, React, Solid, Vue, Svelte, Angular. Uses Temporal API polyfill. Monorepo under pnpm + nx.
+
+## Core Constraints
+
+- All public API methods return Date or string. Never Temporal objects.
+- Input dates: RFC 3339 string, epoch numeric, or Date object.
+- Formatting via Intl.DateTimeFormat parts, not string tokens.
+- Timezone and calendar are always tracked. Defaults from Intl.DateTimeFormat.
+- Date objects are mutable. Never mutate inputs.
+
+## Package Hierarchy
+
+- `@tanstack/time` — core logic (calendar, date ops, formatting)
+- `@tanstack/react-time` — React hooks (useCalendar), re-exports from core
+- `@tanstack/time-devtools` — devtools UI, depends on core
+- `@tanstack/solid-time` — Solid adapter (mirrors react-time)
+- `@tanstack/solid-time-devtools` — Solid devtools
+
+## File Organization
+
+- `packages/time/src/date/` — date manipulation (add, subtract, startOf, endOf, format, parse, etc.)
+- `packages/time/src/calendar/` — calendar engine (CalendarCore, DateCore, event rendering, recurrence, resizing)
+- `packages/time/src/client/` — client-side utilities
+- `packages/time/src/formatter/` — Intl.DateTimeFormat wrappers
+- `packages/time/src/utils/` — shared helpers
+
+## Testing
+
+- Vitest for unit tests. `*.test.ts` co-located with source.
+- React tests use `@testing-library/react`.
+- No comment policy: zero comments in source. Prefer naming, types, structure.
+
+## Build
+
+- `tsdown` for bundling. Outputs ESM + CJS.
+- `nx` for task orchestration.
+- `pnpm` for package management.
+
+## Key Files
+
+- `packages/time/src/calendar/calendar.ts` — CalendarCore class
+- `packages/time/src/calendar/date-core.ts` — DateCore abstract class
+- `packages/time/src/date/index.ts` — date utility exports
+- `packages/time/src/index.ts` — top-level exports
+- `Methodology.md` — API design philosophy
+- `TODO.md` — roadmap
+
+## Navigation
+
+- Read `.ai/graph.json` before exploring. It contains the full package map, file lists, exports, dependencies, and test locations.
+- Use the `edges` array to trace internal dependencies and identify affected packages before modifying core logic.
+- If `graph.json` is stale or missing, run `pnpm run graphify` to regenerate it.
+
+## Agent Rules
+
+- Do not add comments to source code.
+- Follow existing code style. Use explicit types.
+- When changing core, check react-time and devtools for breakage.
+- Run `pnpm test:lib` and `pnpm test:types` before declaring done.
+- Prefer small focused functions over classes.
+- All new date logic must handle timezone and calendar correctly.
diff --git a/.ai/README.md b/.ai/README.md
new file mode 100644
index 00000000..4c9d973f
--- /dev/null
+++ b/.ai/README.md
@@ -0,0 +1,20 @@
+# AI Infrastructure
+
+Generated and maintained for AI agents working on TanStack Time.
+
+## Graphify
+
+`pnpm run graphify` generates `.ai/graph.json` — a machine-readable graph of the monorepo (packages, exports, dependencies, files, tests).
+
+## Spec Kit
+
+`.ai/spec-kit/` contains domain-specific specifications:
+
+- `architecture.md` — monorepo structure, package relationships, build system
+- `testing.md` — test framework, commands, coverage expectations
+- `api-design.md` — input/output contracts, method signatures, design philosophy
+- `calendar-domain.md` — Temporal API, event model, recurrence, availability, views
+
+## Agent Context
+
+`.ai/AGENTS.md` — top-level instructions for AI agents. Read this first.
diff --git a/.ai/graph.json b/.ai/graph.json
new file mode 100644
index 00000000..d21cd61c
--- /dev/null
+++ b/.ai/graph.json
@@ -0,0 +1,302 @@
+{
+  "generated": "2026-06-08T11:19:58.167Z",
+  "packages": [
+    {
+      "name": "@tanstack/react-time",
+      "path": "packages/react-time",
+      "exports": [
+        "useCalendar from ./useCalendar",
+        "calculateGhostPreviewStyle from @tanstack/time",
+        "calculateSegmentResizePreview from @tanstack/time",
+        "calculateTimelineResizePreview from @tanstack/time",
+        "formatEventTimeRange from @tanstack/time",
+        "getEventDisplayTimeRange from @tanstack/time",
+        "getSegmentInfo from @tanstack/time",
+        "isMultiDayEvent from @tanstack/time",
+        "useCalendar",
+        "calculateGhostPreviewStyle",
+        "calculateSegmentResizePreview",
+        "calculateTimelineResizePreview",
+        "formatEventTimeRange",
+        "getEventDisplayTimeRange",
+        "getSegmentInfo",
+        "isMultiDayEvent"
+      ],
+      "dependencies": ["@tanstack/react-store", "@tanstack/time"],
+      "devDependencies": [
+        "@eslint-react/eslint-plugin",
+        "@testing-library/react",
+        "@types/react",
+        "@vitejs/plugin-react",
+        "eslint-plugin-react-compiler",
+        "eslint-plugin-react-hooks",
+        "react"
+      ],
+      "peerDependencies": ["react", "react-dom"],
+      "internalDeps": ["@tanstack/react-store", "@tanstack/time"],
+      "files": [
+        "packages/react-time/src/index.ts",
+        "packages/react-time/src/useCalendar/index.ts",
+        "packages/react-time/src/useCalendar/useCalendar.ts"
+      ],
+      "tests": []
+    },
+    {
+      "name": "@tanstack/react-time-devtools",
+      "path": "packages/react-time-devtools",
+      "exports": ["TimeDevtoolsPanel", "timeDevtoolsPlugin"],
+      "dependencies": ["@tanstack/devtools-utils", "@tanstack/time-devtools"],
+      "devDependencies": [
+        "@eslint-react/eslint-plugin",
+        "@types/react",
+        "@vitejs/plugin-react",
+        "eslint-plugin-react-compiler",
+        "eslint-plugin-react-hooks",
+        "react",
+        "solid-js"
+      ],
+      "peerDependencies": ["react", "react-dom"],
+      "internalDeps": ["@tanstack/devtools-utils", "@tanstack/time-devtools"],
+      "files": [
+        "packages/react-time-devtools/src/index.ts",
+        "packages/react-time-devtools/src/production.ts"
+      ],
+      "tests": []
+    },
+    {
+      "name": "@tanstack/solid-time",
+      "path": "packages/solid-time",
+      "exports": [],
+      "dependencies": ["@tanstack/solid-store", "@tanstack/time"],
+      "devDependencies": ["@types/node", "solid-js", "vite-plugin-solid"],
+      "peerDependencies": ["solid-js"],
+      "internalDeps": ["@tanstack/solid-store", "@tanstack/time"],
+      "files": ["packages/solid-time/src/index.ts"],
+      "tests": []
+    },
+    {
+      "name": "@tanstack/solid-time-devtools",
+      "path": "packages/solid-time-devtools",
+      "exports": ["TimeDevtools", "timeDevtoolsPlugin"],
+      "dependencies": ["@tanstack/devtools-utils", "@tanstack/time-devtools"],
+      "devDependencies": ["solid-js", "vite-plugin-solid"],
+      "peerDependencies": ["solid-js"],
+      "internalDeps": ["@tanstack/devtools-utils", "@tanstack/time-devtools"],
+      "files": [
+        "packages/solid-time-devtools/src/index.ts",
+        "packages/solid-time-devtools/src/production.ts"
+      ],
+      "tests": []
+    },
+    {
+      "name": "@tanstack/time",
+      "path": "packages/time",
+      "exports": ["* from ./date", "* from ./calendar", "* from ./client"],
+      "dependencies": ["@tanstack/devtools-event-client", "@tanstack/store"],
+      "devDependencies": ["vite-tsconfig-paths"],
+      "peerDependencies": [],
+      "internalDeps": ["@tanstack/devtools-event-client", "@tanstack/store"],
+      "files": [
+        "packages/time/src/index.ts",
+        "packages/time/src/calendar/calendar.ts",
+        "packages/time/src/calendar/date-core.ts",
+        "packages/time/src/calendar/expandRecurringEvent.ts",
+        "packages/time/src/calendar/generateDateRange.ts",
+        "packages/time/src/calendar/getEventProps.ts",
+        "packages/time/src/calendar/getResizeProps.ts",
+        "packages/time/src/calendar/getTimeSlots.ts",
+        "packages/time/src/calendar/groupDaysBy.ts",
+        "packages/time/src/calendar/index.ts",
+        "packages/time/src/calendar/resizeController.ts",
+        "packages/time/src/calendar/splitMultiDayEvents.ts",
+        "packages/time/src/calendar/types.ts",
+        "packages/time/src/client/TimeClient.ts",
+        "packages/time/src/client/index.ts",
+        "packages/time/src/formatter/extractLocaleOptions.ts",
+        "packages/time/src/formatter/shared.ts",
+        "packages/time/src/date/index.ts",
+        "packages/time/src/date/types.ts",
+        "packages/time/src/date/validateDate.ts",
+        "packages/time/src/utils/dateDefaults.ts",
+        "packages/time/src/utils/dateRange.ts",
+        "packages/time/src/utils/dateTimeDefaults.ts",
+        "packages/time/src/utils/index.ts",
+        "packages/time/src/utils/weekUtils.ts",
+        "packages/time/src/formatter/buildDateFormatter/buildDateFormatter.ts",
+        "packages/time/src/formatter/buildDateFormatter/index.ts",
+        "packages/time/src/polyfills/getWeekInfo.ts",
+        "packages/time/src/polyfills/types.ts",
+        "packages/time/src/polyfills/weekInfoData.ts",
+        "packages/time/src/formatter/buildDateTimeFormatter/buildDateTimeFormatter.ts",
+        "packages/time/src/formatter/buildDateTimeFormatter/index.ts",
+        "packages/time/src/formatter/buildTimeFormatter/buildTimeFormatter.ts",
+        "packages/time/src/formatter/buildTimeFormatter/index.ts",
+        "packages/time/src/formatter/buildFinalFormatter/buildFinalFormatter.ts",
+        "packages/time/src/formatter/buildFinalFormatter/index.ts",
+        "packages/time/src/date/add/add.ts",
+        "packages/time/src/date/add/index.ts",
+        "packages/time/src/date/endOf/endOf.ts",
+        "packages/time/src/date/endOf/index.ts",
+        "packages/time/src/date/equals/equals.ts",
+        "packages/time/src/date/equals/index.ts",
+        "packages/time/src/date/format/format.ts",
+        "packages/time/src/date/format/index.ts",
+        "packages/time/src/date/helpers/index.ts",
+        "packages/time/src/date/helpers/normalizeLocale.ts",
+        "packages/time/src/date/helpers/normalizeWeek.ts",
+        "packages/time/src/date/helpers/toZonedDateTime.ts",
+        "packages/time/src/date/intersects/index.ts",
+        "packages/time/src/date/intersects/intersects.ts",
+        "packages/time/src/date/isAfter/index.ts",
+        "packages/time/src/date/isAfter/isAfter.ts",
+        "packages/time/src/date/isBefore/index.ts",
+        "packages/time/src/date/isBefore/isBefore.ts",
+        "packages/time/src/date/isBetween/index.ts",
+        "packages/time/src/date/isBetween/isBetween.ts",
+        "packages/time/src/date/isSameOrAfter/index.ts",
+        "packages/time/src/date/isSameOrAfter/isSameOrAfter.ts",
+        "packages/time/src/date/isSameOrBefore/index.ts",
+        "packages/time/src/date/isSameOrBefore/isSameOrBefore.ts",
+        "packages/time/src/date/isLeapYear/index.ts",
+        "packages/time/src/date/isLeapYear/isLeapYear.ts",
+        "packages/time/src/date/isValidDate/index.ts",
+        "packages/time/src/date/isValidDate/isValidDate.ts",
+        "packages/time/src/date/isWeekend/index.ts",
+        "packages/time/src/date/isWeekend/isWeekend.ts",
+        "packages/time/src/date/range/index.ts",
+        "packages/time/src/date/range/range.ts",
+        "packages/time/src/date/parse/index.ts",
+        "packages/time/src/date/parse/parse.ts",
+        "packages/time/src/date/round/index.ts",
+        "packages/time/src/date/round/round.ts",
+        "packages/time/src/date/since/index.ts",
+        "packages/time/src/date/since/since.ts",
+        "packages/time/src/date/startOf/index.ts",
+        "packages/time/src/date/startOf/startOf.ts",
+        "packages/time/src/date/subtract/index.ts",
+        "packages/time/src/date/subtract/subtract.ts",
+        "packages/time/src/date/until/index.ts",
+        "packages/time/src/date/until/until.ts",
+        "packages/time/src/date/withDateOperation/index.ts",
+        "packages/time/src/date/withDateOperation/withDateOperation.ts"
+      ],
+      "tests": [
+        "packages/time/src/calendar/tests/calendar.test.ts",
+        "packages/time/src/date/withDateOperation/withDateOperation.test.ts",
+        "packages/time/src/date/add/tests/add.test.ts",
+        "packages/time/src/formatter/buildFinalFormatter/tests/buildFinalFormatter.test.ts",
+        "packages/time/src/date/endOf/tests/endOf.test.ts",
+        "packages/time/src/date/equals/tests/equals.test.ts",
+        "packages/time/src/date/format/tests/format.test.ts",
+        "packages/time/src/date/intersects/tests/intersects.test.ts",
+        "packages/time/src/date/isBefore/tests/isBefore.test.ts",
+        "packages/time/src/date/isBetween/tests/isBetween.test.ts",
+        "packages/time/src/date/isSameOrAfter/tests/isSameOrAfter.test.ts",
+        "packages/time/src/date/isAfter/tests/isAfter.test.ts",
+        "packages/time/src/date/isSameOrBefore/tests/isSameOrBefore.test.ts",
+        "packages/time/src/date/isLeapYear/tests/isLeapYear.test.ts",
+        "packages/time/src/date/isValidDate/tests/isValidDate.test.ts",
+        "packages/time/src/date/isWeekend/tests/isWeekend.test.ts",
+        "packages/time/src/date/parse/tests/parse.test.ts",
+        "packages/time/src/date/range/tests/range.test.ts",
+        "packages/time/src/date/round/tests/round.test.ts",
+        "packages/time/src/date/since/tests/since.test.ts",
+        "packages/time/src/date/startOf/tests/startOf.test.ts",
+        "packages/time/src/date/subtract/tests/subtract.test.ts",
+        "packages/time/src/date/until/tests/until.test.ts"
+      ]
+    },
+    {
+      "name": "@tanstack/time-devtools",
+      "path": "packages/time-devtools",
+      "exports": ["TimeDevtoolsCore"],
+      "dependencies": [
+        "@tanstack/devtools-ui",
+        "@tanstack/devtools-utils",
+        "@tanstack/time",
+        "goober",
+        "solid-js"
+      ],
+      "devDependencies": ["rolldown-plugin-solid"],
+      "peerDependencies": [],
+      "internalDeps": [
+        "@tanstack/devtools-ui",
+        "@tanstack/devtools-utils",
+        "@tanstack/time"
+      ],
+      "files": [
+        "packages/time-devtools/src/index.ts",
+        "packages/time-devtools/src/production.ts",
+        "packages/time-devtools/src/styles/use-styles.ts"
+      ],
+      "tests": []
+    }
+  ],
+  "edges": [
+    {
+      "from": "@tanstack/react-time",
+      "to": "@tanstack/react-store",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/react-time",
+      "to": "@tanstack/time",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/react-time-devtools",
+      "to": "@tanstack/devtools-utils",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/react-time-devtools",
+      "to": "@tanstack/time-devtools",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/solid-time",
+      "to": "@tanstack/solid-store",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/solid-time",
+      "to": "@tanstack/time",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/solid-time-devtools",
+      "to": "@tanstack/devtools-utils",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/solid-time-devtools",
+      "to": "@tanstack/time-devtools",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/time",
+      "to": "@tanstack/devtools-event-client",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/time",
+      "to": "@tanstack/store",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/time-devtools",
+      "to": "@tanstack/devtools-ui",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/time-devtools",
+      "to": "@tanstack/devtools-utils",
+      "type": "dependency"
+    },
+    {
+      "from": "@tanstack/time-devtools",
+      "to": "@tanstack/time",
+      "type": "dependency"
+    }
+  ]
+}
diff --git a/.ai/spec-kit/api-design.md b/.ai/spec-kit/api-design.md
new file mode 100644
index 00000000..a98c6574
--- /dev/null
+++ b/.ai/spec-kit/api-design.md
@@ -0,0 +1,53 @@
+# API Design Spec
+
+## Design Philosophy
+
+TanStack Time is designed after TanStack Query and TanStack Table: headless, framework-agnostic core with thin framework adapters. See `Methodology.md` for detailed rationale.
+
+## Input Contracts
+
+- Dates accepted as RFC 3339 string, epoch milliseconds (number), or Date object.
+- Timezone and calendar are explicit parameters. If omitted, defaults from `Intl.DateTimeFormat`.
+- Never mutate input Date objects. Always clone or create new Temporal instances.
+
+## Output Contracts
+
+- Public methods return either Date objects or strings.
+- Never return Temporal objects directly to consumers.
+- Methods return `{ value, options }` tuple where `options` carries timezone/calendar used.
+- Formatting methods return string parts via Intl.DateTimeFormat.
+
+## Method Signature Pattern
+
+```ts
+function operationName({
+  date,
+  unit,
+  returnFormat,
+  options,
+}: {
+  date: Date | string | number
+  unit: DateUnit
+  returnFormat?: 'standard' | 'long' | 'epoch' | 'Date' | 'ZonedDateTime'
+  options?: { timeZone?: string; calendar?: string }
+}): { value: ReturnType; options: { timeZone: string; calendar: string } }
+```
+
+## Chaining vs Standalone
+
+- Prefer standalone functions over fluent/chaining APIs.
+- Chaining creates object overhead and hinders treeshaking.
+- Each function is idempotent and composable.
+
+## TypeScript Requirements
+
+- All public APIs must be fully typed.
+- Generic parameters for calendar resources and events.
+- No `any` in public surface.
+
+## Framework Adapter Pattern
+
+- Core is pure TS/JS. No framework dependencies.
+- React adapter: `useCalendar` hook that creates `CalendarCore` instance and exposes reactive selectors.
+- Solid adapter: equivalent `useCalendar` using Solid's reactive primitives.
+- Devtools are separate packages that inject into core store.
diff --git a/.ai/spec-kit/architecture.md b/.ai/spec-kit/architecture.md
new file mode 100644
index 00000000..0f6e7e28
--- /dev/null
+++ b/.ai/spec-kit/architecture.md
@@ -0,0 +1,62 @@
+# Architecture Spec
+
+## Monorepo Layout
+
+```
+packages/
+  time/              — core package
+    src/date/        — date manipulation primitives
+    src/calendar/    — calendar engine
+    src/client/      — client utilities
+    src/formatter/   — Intl.DateTimeFormat wrappers
+    src/utils/       — shared helpers
+    src/index.ts     — public API surface
+  react-time/        — React adapter
+    src/useCalendar/ — useCalendar hook
+    src/index.ts     — re-exports core + React-specific
+  time-devtools/     — devtools UI
+    src/components/  — UI components (Solid-based via goober)
+    src/store/       — devtools state
+    src/core.tsx     — devtools core
+  solid-time/        — Solid adapter (mirrors react-time)
+  solid-time-devtools/ — Solid devtools
+```
+
+## Dependency Graph
+
+- `react-time` → `time`
+- `time-devtools` → `time`
+- `solid-time` → `time`
+- `solid-time-devtools` → `time`
+
+## Build System
+
+- `tsdown` bundles each package. Produces `dist/index.js` (ESM) and `dist/index.cjs` (CJS).
+- `nx` caches builds and runs tests selectively.
+- Root scripts run via `nx run-many` or `nx affected`.
+
+## Public API Surface
+
+Core exports from `@tanstack/time`:
+
+- Date primitives: `add`, `subtract`, `startOf`, `endOf`, `format`, `parse`, `equals`, `isBefore`, `isAfter`, `isBetween`, `range`, `since`, `until`
+- Calendar: `CalendarCore`, `DateCore`, event helpers, recurrence logic
+- Types: `CalendarEvent`, `CalendarResource`, `ResizeState`, etc.
+
+React exports from `@tanstack/react-time`:
+
+- `useCalendar` hook
+- `ResizeState`, `ResizeOptions`, `UseCalendarOptions`
+- Re-exports of core event utilities and types
+
+## State Management
+
+- Core uses `@tanstack/store` for reactive state.
+- React adapter uses `@tanstack/react-store`.
+- CalendarCore maintains event collections, selected dates, current view.
+
+## Key Abstractions
+
+- `DateCore` — abstract base for date operations and navigation
+- `CalendarCore<TResource, TEvent>` — concrete calendar with events, resources, availability
+- `useCalendar` — React hook that instantiates CalendarCore and provides reactive selectors
diff --git a/.ai/spec-kit/calendar-domain.md b/.ai/spec-kit/calendar-domain.md
new file mode 100644
index 00000000..d9ce8e30
--- /dev/null
+++ b/.ai/spec-kit/calendar-domain.md
@@ -0,0 +1,51 @@
+# Calendar Domain Spec
+
+## Temporal API
+
+- Until native browser support, use `@js-temporal/polyfill`.
+- Internal computations use `Temporal.ZonedDateTime` and `Temporal.PlainDate`.
+- Public API never exposes Temporal objects.
+
+## Timezone and Calendar
+
+- A date/time instance is not a static point; it is relative to timezone and calendar.
+- Always track timezone and calendar alongside the instant value.
+- RFC 3339 extended format may include timezone and calendar: `2024-03-05T12:34:56.789Z[America/New_York][u-ca=gregory]`.
+
+## Event Model
+
+- `CalendarEvent` has: id, start, end, title, allDay flag, recurrence rule, resources, dependencies, metadata.
+- `CalendarResource` has: id, title, availability windows, unavailability rules.
+- Events can span multiple days. Split multi-day events into per-day segments for rendering.
+- All-day events have no time component. Rendered at top of day view.
+
+## Recurrence
+
+- Supported: daily, weekly, monthly, yearly.
+- Recurrence exceptions: EXDATE (skip occurrences), modified single occurrences.
+- End conditions: UNTIL date, COUNT number.
+- Expand recurring events into individual occurrences before rendering.
+
+## Resizing and Dragging
+
+- `ResizeController` handles pointer events for event resizing.
+- `calculateSegmentResizePreview` computes preview state during resize.
+- `calculateGhostPreviewStyle` computes CSS for drag ghost.
+- `calculateTimelineResizePreview` computes timeline-specific resize preview.
+- `getResizeProps` returns styling props for resize handles.
+
+## Availability
+
+- Resources define availability windows (start/end times per day).
+- Unavailability rules define blocked ranges.
+- `validateEventDependencies` checks if placing an event satisfies dependency constraints.
+- `getUnavailableRanges` returns blocked ranges for a date.
+
+## Views
+
+- CalendarCore supports: day, week, month, year, agenda, timeline.
+- `groupDaysBy` groups days by unit (week, month) for grid layouts.
+- `goToSpecificPeriod` navigates to a specific date with view context.
+- `getEventsByDate` retrieves all events for a date (including multi-day segments).
+- `getAllDayEventsByDate` retrieves all-day events for a date.
+- `getTimeSlots` generates time slots for day/week views.
diff --git a/.ai/spec-kit/testing.md b/.ai/spec-kit/testing.md
new file mode 100644
index 00000000..12fc4dd2
--- /dev/null
+++ b/.ai/spec-kit/testing.md
@@ -0,0 +1,36 @@
+# Testing Spec
+
+## Test Framework
+
+- Vitest for all unit and integration tests.
+- Co-located tests: `*.test.ts` in same directory as source.
+- React tests use `@testing-library/react` + `@testing-library/jest-dom` matchers.
+- Faker via `@faker-js/faker` for test data generation.
+
+## Test Commands
+
+- `pnpm test:lib` — run Vitest tests
+- `pnpm test:lib:dev` — watch mode
+- `pnpm test:types` — TypeScript type checking via `tsc --noEmit`
+- `pnpm test:eslint` — linting
+- `pnpm test:ci` — full CI suite (eslint, sherif, knip, docs, lib, types, build)
+
+## Coverage Expectations
+
+- Date primitives: edge cases around leap years, timezone transitions, calendar variants
+- Calendar engine: event overlap, multi-day splitting, recurrence, resize, availability
+- React hooks: render cycles, state updates, unmount cleanup
+
+## Test Patterns
+
+- Use explicit timezones in calendar tests. Avoid relying on local system time.
+- Create helper functions for common calendar setup to reduce boilerplate.
+- Mock Temporal API polyfill behavior when testing edge cases.
+- For resize/drag tests, simulate pointer events and verify state transitions.
+
+## CI Requirements
+
+- `pnpm test:pr` must pass before merge.
+- `pnpm test:sherif` ensures dependency consistency across packages.
+- `pnpm test:knip` detects unused exports and dependencies.
+- `pnpm test:docs` verifies all markdown links are valid.
diff --git a/.changeset/config.json b/.changeset/config.json
new file mode 100644
index 00000000..c1ddb08a
--- /dev/null
+++ b/.changeset/config.json
@@ -0,0 +1,17 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@3.1.2/schema.json",
+  "changelog": [
+    "@changesets/changelog-github",
+    { "repo": "TanStack/time", "disableThanks": true }
+  ],
+  "commit": false,
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "fixed": [],
+  "linked": [],
+  "ignore": [],
+  "___experimentalUnsafeOptions_WILL_CHANGE_IN_PATCH": {
+    "onlyUpdatePeerDependentsWhenOutOfRange": true
+  }
+}
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 00000000..9d08a1a8
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,9 @@
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
new file mode 100644
index 00000000..e2ea8ad3
--- /dev/null
+++ b/.github/FUNDING.yml
@@ -0,0 +1,3 @@
+# These are supported funding model platforms
+
+github: tannerlinsley
diff --git a/.github/ISSUE_TEMPLATE/bug_report.yml b/.github/ISSUE_TEMPLATE/bug_report.yml
new file mode 100644
index 00000000..cb3fd88b
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/bug_report.yml
@@ -0,0 +1,100 @@
+name: '🐛 Bug report'
+description: Report a reproducible bug or regression
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for reporting an issue :pray:.
+
+        This issue tracker is for reporting reproducible bugs or regression's found in [time](https://github.com/tanstack/time)
+        If you have a question about how to achieve or implement something and are struggling, please post a question
+        inside of time's [Discussions tab](https://github.com/tanstack/time/discussions) instead of filing an issue.
+
+        Before submitting a new bug/issue, please check the links below to see if there is a solution or question posted there already:
+        - TanStack time's [Discussions tab](https://github.com/tanstack/time/discussions)
+        - TanStack time's [Open Issues](https://github.com/tanstack/time/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc)
+        - TanStack time's [Closed Issues](https://github.com/tanstack/time/issues?q=is%3Aissue+sort%3Aupdated-desc+is%3Aclosed)
+
+        The more information you fill in, the better the community can help you.
+
+  - type: input
+    id: tanstack-time-version
+    attributes:
+      label: TanStack Time version
+      description: |
+        - Please let us know the exact version of the TanStack Time framework adapter that you were using when the issue occurred. If you are using an older version, check to see if your bug has already been solved in the latest version. Please don't just put in "latest", as this is subject to change.
+        - The latest "time" version is <img alt="" src="https://badgen.net/npm/v/@tanstack/react-time" />
+      placeholder: |
+        e.g. v0.0.1
+    validations:
+      required: true
+
+  - type: input
+    id: framework-library-version
+    attributes:
+      label: Framework/Library version
+      description: Which framework and what version of that framework are you using?
+      placeholder: |
+        e.g. React v19.2.3
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug and the steps to reproduce it
+      description: Provide a clear and concise description of the challenge you are running into, and the steps we should take to try to reproduce your bug.
+    validations:
+      required: true
+
+  - type: input
+    id: link
+    attributes:
+      label: Your Minimal, Reproducible Example - (Sandbox Highly Recommended)
+      description: |
+        Please add a link to a minimal reproduction.
+        Note:
+          - Your bug may get fixed much faster if we can run your code and it doesn't have dependencies other than React.
+          - To create a shareable code example for web, you can use CodeSandbox (https://codesandbox.io/s/new) or Stackblitz (https://stackblitz.com/).
+          - Please make sure the example is complete and runnable without prior dependencies and free of unnecessary abstractions
+          - Feel free to fork any of the official CodeSandbox examples to reproduce your issue: https://github.com/tanstack/time/tree/main/examples/
+          - For React Native, you can use: https://snack.expo.dev/
+          - For TypeScript related issues only, a TypeScript Playground link might be sufficient: https://www.typescriptlang.org/play
+          - Please read these tips for providing a minimal example: https://stackoverflow.com/help/mcve.
+      placeholder: |
+        e.g. Code Sandbox, Stackblitz, TypeScript Playground, etc.
+    validations:
+      required: true
+
+  - type: textarea
+    id: screenshots_or_videos
+    attributes:
+      label: Screenshots or Videos (Optional)
+      description: |
+        If applicable, add screenshots or a video to help explain your problem.
+        For more information on the supported file image/file types and the file size limits, please refer
+        to the following link: https://docs.github.com/en/github/writing-on-github/working-with-advanced-formatting/attaching-files
+      placeholder: |
+        You can drag your video or image files inside of this editor ↓
+
+  - type: dropdown
+    attributes:
+      options:
+        - No, because I do not know how
+        - No, because I do not have time to dig into it
+        - Maybe, I'll investigate and start debugging
+        - Yes, I think I know how to fix it and will discuss it in the comments of this issue
+        - Yes, I am also opening a PR that solves the problem along side this issue
+      label: Do you intend to try to help solve this bug with your own PR?
+      description: |
+        If you think you know the cause of the problem, the fastest way to get it fixed is to suggest a fix, or fix it yourself! However, it is ok if you cannot solve this yourself and are just wanting help.
+  - type: checkboxes
+    id: agrees-to-terms
+    attributes:
+      label: Terms & Code of Conduct
+      description: By submitting this issue, you agree to follow our Code of Conduct and can verify that you have followed the requirements outlined above to the best of your ability.
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true
+        - label: I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.
+          required: true
diff --git a/.github/ISSUE_TEMPLATE/config.yml b/.github/ISSUE_TEMPLATE/config.yml
new file mode 100644
index 00000000..d47ed610
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -0,0 +1,11 @@
+blank_issues_enabled: false
+contact_links:
+  - name: 🤔 Feature Requests & Questions
+    url: https://github.com/TanStack/time/discussions
+    about: Please ask and answer questions here.
+  - name: 💬 Community Chat
+    url: https://discord.gg/mQd7egN
+    about: A dedicated discord server hosted by TanStack
+  - name: 🦋 TanStack Bluesky
+    url: https://bsky.app/profile/tanstack.com
+    about: Stay up to date with new releases of our libraries
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
new file mode 100644
index 00000000..0262cea3
--- /dev/null
+++ b/.github/pull_request_template.md
@@ -0,0 +1,13 @@
+## 🎯 Changes
+
+<!-- What changes are made in this PR? Describe the change and its motivation. -->
+
+## ✅ Checklist
+
+- [ ] I have followed the steps in the [Contributing guide](https://github.com/TanStack/time/blob/main/CONTRIBUTING.md).
+- [ ] I have tested this code locally with `pnpm run test:pr`.
+
+## 🚀 Release Impact
+
+- [ ] This change affects published code, and I have generated a [changeset](https://github.com/changesets/changesets/blob/main/docs/adding-a-changeset.md).
+- [ ] This change is docs/CI/dev-only (no release).
diff --git a/.github/renovate.json b/.github/renovate.json
new file mode 100644
index 00000000..fb2083cf
--- /dev/null
+++ b/.github/renovate.json
@@ -0,0 +1,20 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "configMigration": true,
+  "extends": [
+    "config:recommended",
+    "group:allNonMajor",
+    "schedule:weekly",
+    ":approveMajorUpdates",
+    ":automergeMinor",
+    ":disablePeerDependencies",
+    ":maintainLockFilesMonthly",
+    ":semanticCommits",
+    ":semanticCommitTypeAll(chore)"
+  ],
+  "ignorePresets": [":ignoreModulesAndTests"],
+  "labels": ["dependencies"],
+  "rangeStrategy": "bump",
+  "postUpdateOptions": ["pnpmDedupe"],
+  "ignoreDeps": ["@types/node", "node"]
+}
diff --git a/.github/workflows/autofix.yml b/.github/workflows/autofix.yml
new file mode 100644
index 00000000..12dceb88
--- /dev/null
+++ b/.github/workflows/autofix.yml
@@ -0,0 +1,33 @@
+name: autofix.ci # needed to securely identify the workflow
+
+on:
+  pull_request:
+  push:
+    branches: [main, alpha, beta, rc]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number || github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  autofix:
+    name: autofix
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+      - name: Setup Tools
+        uses: tanstack/config/.github/setup@e4b48f16568324f76f467aa4c2aac2f05db632c3 # main
+      - name: Fix formatting
+        run: pnpm run format
+      - name: Regenerate docs
+        run: pnpm build:all && pnpm generate-docs
+      - name: Apply fixes
+        uses: autofix-ci/action@635ffb0c9798bd160680f18fd73371e355b85f27
+        with:
+          commit-message: 'ci: apply automated fixes'
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
new file mode 100644
index 00000000..128fe388
--- /dev/null
+++ b/.github/workflows/pr.yml
@@ -0,0 +1,52 @@
+name: PR
+
+on:
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - 'media/**'
+      - '**/*.md'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number || github.ref }}
+  cancel-in-progress: true
+
+env:
+  NX_CLOUD_ACCESS_TOKEN: ${{ secrets.NX_CLOUD_ACCESS_TOKEN }}
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+      - name: Setup Tools
+        uses: tanstack/config/.github/setup@e4b48f16568324f76f467aa4c2aac2f05db632c3 # main
+      - name: Get base and head commits for `nx affected`
+        uses: nrwl/nx-set-shas@3e9ad7370203c1e93d109be57f3b72eb0eb511b1 # v4.4.0
+        with:
+          main-branch-name: main
+      - name: Run Checks
+        run: pnpm run test:pr
+  preview:
+    name: Preview
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+      - name: Setup Tools
+        uses: tanstack/config/.github/setup@e4b48f16568324f76f467aa4c2aac2f05db632c3 # main
+      - name: Build Packages
+        run: pnpm run build:all
+      - name: Publish Previews
+        run: pnpx pkg-pr-new publish --pnpm './packages/*' --template './examples/*/*'
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 00000000..6f9391b4
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,42 @@
+name: Release
+
+on:
+  push:
+    # branches: [main, alpha, beta, rc]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number || github.ref }}
+  cancel-in-progress: true
+
+env:
+  NX_CLOUD_ACCESS_TOKEN: ${{ secrets.NX_CLOUD_ACCESS_TOKEN }}
+
+permissions:
+  contents: write
+  id-token: write
+  pull-requests: write
+
+jobs:
+  release:
+    name: Release
+    if: github.repository_owner == 'TanStack'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+      - name: Setup Tools
+        uses: tanstack/config/.github/setup@e4b48f16568324f76f467aa4c2aac2f05db632c3 # main
+      - name: Run Tests
+        run: pnpm run test:ci
+      - name: Run Changesets (version or publish)
+        uses: changesets/action@e0145edc7d9d8679003495b11f87bd8ef63c0cba # v1.5.3
+        with:
+          version: pnpm run changeset:version
+          publish: pnpm run changeset:publish
+          commit: 'ci: Version Packages'
+          title: 'ci: Version Packages'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
new file mode 100644
index 00000000..ba8e8cfa
--- /dev/null
+++ b/.github/workflows/zizmor.yml
@@ -0,0 +1,25 @@
+name: GitHub Actions Security Analysis
+
+on:
+  push:
+    branches: [alpha]
+  pull_request:
+    branches: ['**']
+
+permissions: {}
+
+jobs:
+  zizmor:
+    name: Run zizmor
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Run zizmor
+        uses: zizmorcore/zizmor-action@b1d7e1fb5de872772f31590499237e7cce841e8e # v0.5.3
+        with:
+          advanced-security: false
+          annotations: true
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..3005d7b6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,63 @@
+
+# See https://help.github.com/ignore-files/ for more about ignoring files.
+
+# dependencies
+node_modules
+package-lock.json
+yarn.lock
+
+# builds
+build
+dist
+lib
+es
+artifacts
+.rpt2_cache
+coverage
+*.tgz
+
+# misc
+.DS_Store
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+.next
+.svelte-kit
+
+# developer-specific VS Code config files
+.vscode/tasks.json
+.vscode/launch.json
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.history
+size-plugin.json
+stats-hydration.json
+stats-react.json
+stats.html
+.vscode/settings.json
+.idea
+.cursor
+.claude
+
+*.log
+.DS_Store
+.cache
+.idea
+.pnpm-store
+
+package-lock.json
+yarn.lock
+*.tsbuildinfo
+*.tsbuildinfo
+
+.svelte-kit
+.nx/cache
+.nx/workspace-data
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*
+
+.angular
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 00000000..268c392d
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1 @@
+provenance=true
diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 00000000..b4040276
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+24.8.0
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 00000000..fe4bf24f
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,11 @@
+**/.nx/
+**/.nx/cache
+**/.svelte-kit
+**/build
+**/coverage
+**/dist
+**/docs
+**/old-examples
+pnpm-lock.yaml
+
+.angular
diff --git a/.specify/README.md b/.specify/README.md
new file mode 100644
index 00000000..b16931ae
--- /dev/null
+++ b/.specify/README.md
@@ -0,0 +1,70 @@
+# Spec Kit — TanStack Time
+
+This is the Spec-Driven Development (SDD) infrastructure for TanStack Time, following the [github/spec-kit](https://github.com/github/spec-kit) methodology.
+
+## Workflow
+
+```
+/speckit.constitution  →  /speckit.specify  →  /speckit.clarify (optional)
+       ↓
+  /speckit.plan  →  /speckit.analyze (optional)  →  /speckit.tasks
+       ↓
+  /speckit.implement
+```
+
+## Directory Structure
+
+```
+.specify/
+  memory/
+    constitution.md      # Project principles (read first, always)
+  scripts/bash/
+    common.sh            # Shared utilities
+    create-new-feature.sh # Scaffolds specs/<id>-<name>/
+    setup-plan.sh        # Scaffolds plan.md
+    setup-tasks.sh       # Scaffolds tasks.md
+  templates/
+    constitution-template.md
+    spec-template.md
+    plan-template.md
+    tasks-template.md
+
+specs/
+  001-<feature>/         # Feature specs live here
+    spec.md              # Functional requirements
+    plan.md              # Technical implementation
+    tasks.md             # Actionable task breakdown
+    contracts/           # API contracts, data models
+
+.claude/commands/
+  speckit-constitution.md   # /speckit.constitution
+  speckit-specify.md        # /speckit.specify
+  speckit-clarify.md        # /speckit.clarify
+  speckit-plan.md           # /speckit.plan
+  speckit-analyze.md        # /speckit.analyze
+  speckit-tasks.md          # /speckit.tasks
+  speckit-implement.md      # /speckit.implement
+```
+
+## Commands
+
+| Command                 | Purpose                          | When to run                   |
+| ----------------------- | -------------------------------- | ----------------------------- |
+| `/speckit.constitution` | Create/update project principles | First, before any feature     |
+| `/speckit.specify`      | Write functional requirements    | For each new feature          |
+| `/speckit.clarify`      | Ask clarifying questions         | After specify, before plan    |
+| `/speckit.plan`         | Write technical plan             | After clarify/specify         |
+| `/speckit.analyze`      | Check spec-plan-task coverage    | After tasks, before implement |
+| `/speckit.tasks`        | Break plan into tasks            | After plan                    |
+| `/speckit.implement`    | Execute task breakdown           | After tasks                   |
+
+## Constitution
+
+Read `.specify/memory/constitution.md` before any development. It defines:
+
+- Zero comments in source code
+- Headless core, thin adapters
+- No Temporal leakage in public API
+- Immutable inputs
+- Treeshakable standalone functions
+- Test-first for all public functions
diff --git a/.specify/memory/constitution.md b/.specify/memory/constitution.md
new file mode 100644
index 00000000..db1644c5
--- /dev/null
+++ b/.specify/memory/constitution.md
@@ -0,0 +1,41 @@
+# TanStack Time Constitution
+
+## Purpose
+
+TanStack Time is a headless, framework-agnostic date/time and calendar utility library. It provides the core logic for building time and calendar UI components across React, Solid, Vue, Svelte, and Angular. It is designed after TanStack Query and TanStack Table: a powerful, treeshakable core with thin framework adapters.
+
+## Core Principles
+
+1. **Headless First**: All UI logic lives in the core. Framework adapters are thin reactive wrappers.
+2. **Temporal Accuracy**: Date/time instances are relative to timezone and calendar. Never treat them as static points.
+3. **Zero Comments**: Source code contains no comments. Prefer names, types, structure, and tests.
+4. **Treeshakable**: Prefer standalone functions over fluent APIs. Each function is idempotent and composable.
+5. **No Temporal Leakage**: Public API returns Date or string. Never expose Temporal objects to consumers.
+6. **Immutable Inputs**: Never mutate Date objects passed into the API. Always clone or create new Temporal instances.
+7. **Standards-Based**: Use RFC 3339 for serialization, Intl.DateTimeFormat for display, and the Temporal polyfill for computation.
+
+## Quality Standards
+
+- **Testing**: Every public function must have co-located unit tests using Vitest. React hooks tested with `@testing-library/react`.
+- **Type Safety**: All public APIs fully typed. No `any` in the public surface. Generics for calendar resources and events.
+- **Performance**: Date primitives should be fast enough for frequent re-renders. Avoid creating unnecessary Temporal objects.
+- **Edge Cases**: Handle leap years, timezone transitions, and calendar variants correctly.
+- **CI Gate**: `pnpm test:pr` (eslint, sherif, knip, docs, lib, types, build) must pass before merge.
+
+## Technical Decisions
+
+- **Monorepo**: pnpm workspaces + nx for task orchestration and caching.
+- **Build**: `tsdown` produces ESM + CJS for each package.
+- **State**: `@tanstack/store` in core. `@tanstack/react-store` in React adapter.
+- **Temporal**: `@js-temporal/polyfill` until native browser support.
+- **Formatting**: Intl.DateTimeFormat parts, not string tokens.
+- **Date Input**: Accept RFC 3339 string, epoch milliseconds, or Date object.
+
+## Process Rules
+
+1. **No comments in source code**. If a constraint is non-obvious, encode it in the type system or test.
+2. **Small focused functions over classes**. Only use classes where state management is necessary (CalendarCore, DateCore).
+3. **When changing core, check all adapters**. react-time, solid-time, and devtools must remain compatible.
+4. **Run tests before declaring done**. `pnpm test:lib` and `pnpm test:types`.
+5. **All new date logic must handle timezone and calendar correctly**.
+6. **Prefer improving names, types, APIs, structure, and tests over adding comments**.
diff --git a/.specify/scripts/bash/common.sh b/.specify/scripts/bash/common.sh
new file mode 100644
index 00000000..7a7cb6b4
--- /dev/null
+++ b/.specify/scripts/bash/common.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../../.." && pwd)"
+SPECS_DIR="${ROOT_DIR}/specs"
+SPECIFY_DIR="${ROOT_DIR}/.specify"
+MEMORY_DIR="${SPECIFY_DIR}/memory"
+TEMPLATES_DIR="${SPECIFY_DIR}/templates"
+
+next_feature_id() {
+  local max_id=0
+  for dir in "${SPECS_DIR}"/*/; do
+    if [ -d "$dir" ]; then
+      local id=$(basename "$dir" | cut -d'-' -f1)
+      if [[ "$id" =~ ^[0-9]+$ ]]; then
+        if [ "$id" -gt "$max_id" ]; then
+          max_id=$id
+        fi
+      fi
+    fi
+  done
+  printf "%03d" $((max_id + 1))
+}
+
+slugify() {
+  echo "$1" | tr '[:upper:]' '[:lower:]' | tr ' ' '-' | tr -cd '[:alnum:]-' | sed 's/-*$//'
+}
+
+check_prerequisites() {
+  if [ ! -f "${MEMORY_DIR}/constitution.md" ]; then
+    echo "ERROR: No constitution found. Run /speckit.constitution first."
+    exit 1
+  fi
+}
diff --git a/.specify/scripts/bash/create-new-feature.sh b/.specify/scripts/bash/create-new-feature.sh
new file mode 100644
index 00000000..bec03212
--- /dev/null
+++ b/.specify/scripts/bash/create-new-feature.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+set -euo pipefail
+
+source "$(dirname "$0")/common.sh"
+
+FEATURE_NAME="${1:-}"
+if [ -z "$FEATURE_NAME" ]; then
+  echo "Usage: $0 <feature-name>"
+  exit 1
+fi
+
+ID=$(next_feature_id)
+SLUG=$(slugify "$FEATURE_NAME")
+FEATURE_DIR="${SPECS_DIR}/${ID}-${SLUG}"
+
+mkdir -p "$FEATURE_DIR"
+
+cat > "${FEATURE_DIR}/spec.md" <<EOF
+# Specification: ${FEATURE_NAME}
+
+## User Stories
+
+As a user, I want...
+
+## Functional Requirements
+
+1. Requirement 1
+2. Requirement 2
+
+## Non-Functional Requirements
+
+- Performance: ...
+- Compatibility: ...
+
+## Acceptance Criteria
+
+- [ ] Criterion 1
+- [ ] Criterion 2
+
+## Review & Acceptance Checklist
+
+- [ ] Requirements are clear and unambiguous
+- [ ] All user stories have acceptance criteria
+- [ ] Edge cases are documented
+- [ ] Dependencies are identified
+- [ ] No over-engineered components
+- [ ] Aligns with project constitution
+EOF
+
+echo "Created ${FEATURE_DIR}/spec.md"
diff --git a/.specify/scripts/bash/setup-plan.sh b/.specify/scripts/bash/setup-plan.sh
new file mode 100644
index 00000000..298cb978
--- /dev/null
+++ b/.specify/scripts/bash/setup-plan.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+set -euo pipefail
+
+source "$(dirname "$0")/common.sh"
+
+FEATURE_DIR="${1:-}"
+if [ -z "$FEATURE_DIR" ] || [ ! -d "$FEATURE_DIR" ]; then
+  echo "Usage: $0 <feature-dir>"
+  exit 1
+fi
+
+cat > "${FEATURE_DIR}/plan.md" <<EOF
+# Implementation Plan
+
+## Overview
+
+## Tech Stack
+
+## Architecture
+
+## Data Model
+
+## API Contracts
+
+## Implementation Phases
+
+## Risk Analysis
+
+## Research Notes
+EOF
+
+mkdir -p "${FEATURE_DIR}/contracts"
+
+echo "Created ${FEATURE_DIR}/plan.md"
diff --git a/.specify/scripts/bash/setup-tasks.sh b/.specify/scripts/bash/setup-tasks.sh
new file mode 100644
index 00000000..2945d08d
--- /dev/null
+++ b/.specify/scripts/bash/setup-tasks.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+set -euo pipefail
+
+source "$(dirname "$0")/common.sh"
+
+FEATURE_DIR="${1:-}"
+if [ -z "$FEATURE_DIR" ] || [ ! -d "$FEATURE_DIR" ]; then
+  echo "Usage: $0 <feature-dir>"
+  exit 1
+fi
+
+cat > "${FEATURE_DIR}/tasks.md" <<EOF
+# Tasks
+
+## Phase 1: Foundation
+
+## Phase 2: Core Implementation
+
+## Phase 3: Polish & Validation
+
+## Dependencies
+
+## Parallel Execution
+EOF
+
+echo "Created ${FEATURE_DIR}/tasks.md"
diff --git a/.specify/templates/constitution-template.md b/.specify/templates/constitution-template.md
new file mode 100644
index 00000000..ca769ce9
--- /dev/null
+++ b/.specify/templates/constitution-template.md
@@ -0,0 +1,21 @@
+# Project Constitution
+
+## Purpose
+
+{{purpose}}
+
+## Core Principles
+
+{{principles}}
+
+## Quality Standards
+
+{{quality_standards}}
+
+## Technical Decisions
+
+{{technical_decisions}}
+
+## Process Rules
+
+{{process_rules}}
diff --git a/.specify/templates/plan-template.md b/.specify/templates/plan-template.md
new file mode 100644
index 00000000..943050a4
--- /dev/null
+++ b/.specify/templates/plan-template.md
@@ -0,0 +1,33 @@
+# Implementation Plan: {{feature_name}}
+
+## Overview
+
+{{overview}}
+
+## Tech Stack
+
+{{tech_stack}}
+
+## Architecture
+
+{{architecture}}
+
+## Data Model
+
+{{data_model}}
+
+## API Contracts
+
+{{api_contracts}}
+
+## Implementation Phases
+
+{{phases}}
+
+## Risk Analysis
+
+{{risks}}
+
+## Research Notes
+
+{{research}}
diff --git a/.specify/templates/spec-template.md b/.specify/templates/spec-template.md
new file mode 100644
index 00000000..761bdc24
--- /dev/null
+++ b/.specify/templates/spec-template.md
@@ -0,0 +1,26 @@
+# Specification: {{feature_name}}
+
+## User Stories
+
+{{user_stories}}
+
+## Functional Requirements
+
+{{requirements}}
+
+## Non-Functional Requirements
+
+{{non_functional_requirements}}
+
+## Acceptance Criteria
+
+{{acceptance_criteria}}
+
+## Review & Acceptance Checklist
+
+- [ ] Requirements are clear and unambiguous
+- [ ] All user stories have acceptance criteria
+- [ ] Edge cases are documented
+- [ ] Dependencies are identified
+- [ ] No over-engineered components
+- [ ] Aligns with project constitution
diff --git a/.specify/templates/tasks-template.md b/.specify/templates/tasks-template.md
new file mode 100644
index 00000000..ce92b48d
--- /dev/null
+++ b/.specify/templates/tasks-template.md
@@ -0,0 +1,21 @@
+# Tasks: {{feature_name}}
+
+## Phase 1: {{phase_1_name}}
+
+{{phase_1_tasks}}
+
+## Phase 2: {{phase_2_name}}
+
+{{phase_2_tasks}}
+
+## Phase 3: {{phase_3_name}}
+
+{{phase_3_tasks}}
+
+## Dependencies
+
+{{dependencies}}
+
+## Parallel Execution
+
+{{parallel_tasks}}
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
new file mode 100644
index 00000000..fa111aa2
--- /dev/null
+++ b/CODE_OF_CONDUCT.md
@@ -0,0 +1,81 @@
+---
+title: Code of Conduct
+id: code-of-conduct
+---
+
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+- Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+- The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+- Trolling, insulting/derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at TANNERLINSLEY@GMAIL.COM. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq
diff --git a/CONTEXT.md b/CONTEXT.md
new file mode 100644
index 00000000..dfdf9c7e
--- /dev/null
+++ b/CONTEXT.md
@@ -0,0 +1,153 @@
+# TanStack Time
+
+A comprehensive, Temporal-native library for date/time problems. Two layers: a set of
+pure date/time functions, and a stateful core extended by feature modules (calendar,
+scheduling, undo/redo, …) in the style of TanStack Table v9 / AG Grid modules.
+
+## Language
+
+**Date Primitive**:
+A pure, stateless date/time function (e.g. `add`, `startOf`, `format`). Operates on a
+single value, holds no state, belongs to no module. The "alternative to date-fns" layer.
+Returns a native `Date` for instant-bearing results.
+_Avoid_: helper, util (too vague)
+
+**Instant**:
+An exact moment in time (UTC milliseconds). The public boundary represents instants as
+native `Date` objects. A `Date` carries no timezone or calendar.
+_Avoid_: timestamp, moment (Moment.js baggage)
+
+**Civil Date**:
+A calendar-civil value with no instant — a day, month, or all-day boundary (e.g.
+`Day.date`, `currentPeriod`). Represented at the public boundary as an ISO string
+(`YYYY-MM-DD`), never as a `Date`, to avoid the all-day off-by-one. Temporal `PlainDate` is
+the internal-only counterpart.
+_Avoid_: plain date (Temporal-internal term), date-only
+
+**Data Strategy**:
+The pluggable choice (`client` | `server`) of _where the projection/validation pipeline
+executes_, analogous to AG Grid's row model. In `client` mode every stage runs in-process over
+a supplied event set; in `server` mode the delegatable stages (sourcing, recurrence-expand,
+conflict, slot-generation) run on the server via the shared Validation Core, returning
+materialized results. Clip-to-viewport and layout always run client-side. The consumer's
+calendar API is the same in both.
+_Avoid_: mode (informal), row model (AG Grid's term)
+
+**Kernel**:
+The single stateful core every product shares. It owns the **event collection**, the
+**viewport** (current period + view mode) with its navigation, the **date-range
+projection** (events mapped to the visible range), and plain create/edit/remove. Nothing
+domain-specific (no availability, recurrence, dependencies, drag, or undo) lives here.
+Analogous to the one TanStack Table core (table instance + row model).
+_Avoid_: core, engine (informal synonyms; "kernel" is canonical)
+
+**Module**:
+A unit of opt-in feature behavior that extends the kernel (recurrence, availability,
+dependencies, drag-resize, undo/redo, scheduling). Modeled on TanStack Table v9 / AG Grid
+modules so unused features tree-shake away. A module _adds capability and state_.
+_Avoid_: plugin, feature, extension (pick one canonical term — see open question)
+
+**Product**:
+A user-facing bundle = the kernel + a preset of modules + a chosen view. _Calendar_,
+_Scheduler_ (Calendly-style), and _Timeline/Gantt_ are products, **not** separate kernels.
+A product is a convenience preset, not a new core.
+_Avoid_: app, preset (informal)
+
+**Master Event** / **Occurrence**:
+A Master Event carries the recurrence rule; Occurrences are the individual instances expanded
+from it for the current viewport. Occurrences are ephemeral (derived in the projection), not
+stored.
+_Avoid_: parent/child, series/instance (mix freely — pick master/occurrence)
+
+**Override** / **Exception**:
+An Override is a single Occurrence modified in place (moved, retitled), keyed by its original
+start (RECURRENCE-ID). An Exception is an Occurrence removed from the series (EXDATE). Both
+live on the Master Event's rule.
+_Avoid_: edit/delete-this-one (describe the data, not the gesture)
+
+**Recurrence Rule**:
+The structured repeat definition on a Master Event, scoped to the UI-builder subset
+(frequency, interval, until/count, `byWeekday` with optional ordinal, `byMonthDay`). Full RFC
+5545 RRULE is an optional interop adapter, not this model.
+_Avoid_: RRULE (that names the iCal string form, not our structured model)
+
+**Viewport**:
+The kernel's window onto time: the current period plus the view mode that determines its
+span. Navigation moves the viewport; it does not change the event collection.
+_Avoid_: window, range (overloaded), current view
+
+**Projection**:
+The derived, read-only result the kernel computes from the event collection for the current
+viewport (events mapped onto the visible range). Views and modules transform the projection;
+they never mutate the event collection through it.
+_Avoid_: render, output, derived state
+
+**Advisory Validation**:
+Client-side conflict/availability checking run by the kernel over the events currently
+loaded. Instant UX feedback only — never authoritative, because the client may hold a partial
+dataset and cannot see other users' concurrent writes.
+_Avoid_: client validation (describe the role, not the location)
+
+**Authoritative Validation**:
+The same validation logic run server-side against the full dataset, ideally inside the write
+transaction. The source of truth for whether a write is allowed.
+_Avoid_: server check, backend validation
+
+**Required Range**:
+The date range the kernel declares it must have loaded to validate a proposed write
+(`getRequiredRange`). The orchestration layer ensures that range is loaded (via TanStack
+Query) before the sync validation runs. The kernel declares the need; it never fetches.
+_Avoid_: fetch range, query range
+
+**Validation Core**:
+The pure, isomorphic rule logic (`validate(write, events, config) → conflicts`) shared by the
+client (advisory) and server (authoritative). No store, no viewport, no DOM, no DB.
+_Avoid_: validator, rules engine (informal)
+
+**`loadEvents` Adapter**:
+A consumer-implemented function the server package calls to read events for a Required Range
+from the consumer's own database, inside the consumer's transaction. The only DB seam; the
+library never opens a connection.
+_Avoid_: data source, repository
+
+**Event Layout**:
+The logical placement of an event in the projection, independent of pixels: time-axis
+position as fractions (`startFraction`/`endFraction`), overlap position as `column` /
+`columnCount`, and `lane` for timelines. The view's prop-getter turns this into a
+percentage-based `style` object.
+_Avoid_: position, geometry, coordinates (imply pixels)
+
+**Lane**:
+A horizontal track in a timeline that separates events which would otherwise overlap in
+time. Distinct from an overlap `column` (the day/week side-by-side split).
+_Avoid_: row, track
+
+**Adapter**:
+A thin framework binding that wires the headless core into a framework's reactivity (e.g.
+`@tanstack/react-time`'s `useCalendar`). Holds no domain logic. Solid serves as the proof
+that the core is framework-agnostic.
+_Avoid_: integration, binding, wrapper
+
+**Resource**:
+A bookable/assignable entity an event consumes (a room, a person, a piece of equipment),
+carrying availability windows, capacity, and buffers. The unit availability and capacity
+rules are checked against.
+_Avoid_: asset, entity, calendar (overloaded)
+
+**Availability**:
+The windows during which a Resource can hold events (weekday + start/end time), plus capacity
+and buffer rules. Drives both advisory conflict checks and the Scheduler's free-slot
+projection.
+_Avoid_: schedule, hours, working hours
+
+**Calendar** / **Scheduler** / **Timeline**:
+Products. Calendar = kernel + recurrence/drag-resize/undo over a day/week/month view.
+Scheduler = kernel + availability + scheduling (free-slot projection + `book()`) over a
+slot-picker view. Timeline/Gantt = kernel + dependencies (events that push each other) over
+a timeline view.
+
+**View** (a.k.a. Renderer):
+A way of presenting a kernel's projection (day, week, month, agenda, timeline strip). A
+view _reads_ the projection; it does not add capability. This is the line that separates a
+view from a module.
+_Avoid_: layout, display (too vague)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 00000000..a23c8cfe
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,55 @@
+---
+title: Contributing
+id: contributing
+---
+
+# Contributing
+
+## Questions
+
+If you have questions about implementation details, help or support, then please use our dedicated community forum at [Github Discussions](https://github.com/tanstack/time/discussions) **PLEASE NOTE:** If you choose to instead open an issue for your question, your issue will be immediately closed and redirected to the forum.
+
+## Reporting Issues
+
+If you have found what you think is a bug, please [file an issue](https://github.com/tanstack/time/issues/new). **PLEASE NOTE:** Issues that are identified as implementation questions or non-issues will be immediately closed and redirected to [Github Discussions](https://github.com/tanstack/time/discussions)
+
+## Suggesting new features
+
+If you are here to suggest a feature, first create an issue if it does not already exist. From there, we will discuss use-cases for the feature and then finally discuss how it could be implemented.
+
+## Development
+
+Before proceeding with development, ensure you match one of the following criteria:
+
+- Fixing a small bug
+- Fixing a larger issue that has been previously discussed and agreed-upon by maintainers
+- Adding a new feature that has been previously discussed and agreed-upon by maintainers
+
+## Development Workflow
+
+- Fork this repository, we prefer the `feat-*` branch name style
+- Ensure you have `pnpm` installed
+- Install projects dependencies and linkages by running `pnpm install`
+- Auto-build and auto-test files as you edit by running `pnpm dev`
+- Implement your changes and tests
+- To run examples, follow their individual directions. Usually this includes:
+  - cd into the example directory
+  - Do NOT install dependencies again or do any linking. Nx already handles this for you. Only run install from the project root.
+  - Starting the dev server with `pnpm dev` or `pnpm start` (from the example directory)
+- To test in your own projects:
+  - Build/watch for changes with `pnpm build`/`pnpm dev`
+- Document your changes in the appropriate documentation website markdown pages
+- Run `pnpm test` to ensure all tests pass before committing
+- Create a changeset (changelog entry) for your changes by running `pnpm changeset`
+- Commit your work and open a pull request
+- Submit PR for review
+
+## Adding a new example
+
+- Clone an existing example into the appropriate `examples` directory
+- Name it the example name in kebab-case
+- Update the new example's package.json to match the new example name and any other details
+- Check dependencies for unused packages
+- Install any additional packages to the example that you may need
+- Update the docs/config.json file to include the new example in the navigation sidebar
+- Commit the example eg. `docs: Add example-name`
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 00000000..308cb68d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Tanner Linsley
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/Methodology.md b/Methodology.md
new file mode 100644
index 00000000..1369960a
--- /dev/null
+++ b/Methodology.md
@@ -0,0 +1,152 @@
+## Some Givens
+
+As mentioned in our initial wiki entry, we have a few givens that we are working with:
+
+- Dates, given to the TanStack Time API, should be in standard Internet Date Time Format [RFC 3339](https://datatracker.ietf.org/doc/html/rfc3339) (string) format, epoch time (numeric), or already be a Date object.
+- Format of dates/times are configurable to base standards set forth by the Intl.DateTimeFormat API. Formats are not designated by string tokens, but rather by parts, and displayed according to locale, calendar and timezone. This ensures consistent display of dates and times when switching between any of these three localization points.
+- Until Temporal is ratified and implemented by all major browsers, TanStack Time will [use the polyfill](https://github.com/js-temporal/temporal-polyfill) maintained by the TC39 champions of the Temporal API
+- Date objects are mutable, therefore we must take care not to directly revise any Date passed into the API
+- Public API methods should return either a Date object or a string. Temporal objects should never be returned by the public API methods.
+
+## Assumptions of working with true date and time
+
+Developers, dealing with accurate references to an instance of date/time, require a few things:
+
+- A reference to the date/time instance, either as an RFC 3339 string or epoch time
+- The timezone of the date/time instance
+- And, in some instances, the calendar system of the date/time instance
+
+Why is this important? Because a date/time instance is not a static point in time. It is a reference to a point in time that is relative to the timezone and calendar system in which it is being referenced. This is why it is important to know the timezone and calendar system of the date/time instance. This is the reason the Temporal API is so important. It allows us to work with date/time instances in a way that is more accurate with how we truly interoperate with date/time instances.
+
+## Defaults
+
+We can get the browser local defaults for the timezone and calendar system by using the Intl.DateTimeFormat API. This will allow us to set defaults for the timezone and calendar system when the developer does not provide them. That said, we should always allow the developer to override these defaults on a case by case basis.
+
+## Rethinking In Terms of DX
+
+When we think about the DX of the TanStack Time API, we need to consider the following:
+
+- Developers will often be working with date and time values stored in a database
+- Developers will often be working with date and time values from user input
+- Those values will need to be converted to valid ZonedDateTime objects internally
+  - This will require the developer to know the timezone of the date/time instance
+  - This will require the developer to know the calendar system of the date/time instance
+- Developers will need to be able to define the representation (return type) of the return value of a method (this excludes formatting methods)
+  - Do they need an RFC 3339 string? 'standard' (current zulu time standard) or 'long' (with timezone and calendar)?
+  - Do they need an epoch time?
+  - Do they need a Date object?
+  - Do they need a ZonedDateTime object? (this would be for calling multiple methods back to back to back)
+
+Because the user may use the browser defaults for the timezone and calendar system, it may be necessary to return these options with the 'result' of a method call. This will allow the developer to know what the defaults were when the method was called, where they may need to database the timeZone or calendar.
+
+```js
+// maybe?
+const { value: firstOfMonth, options } = startOf({
+  date: '2024-03-05T12:34:56.789Z',
+  unit: 'month',
+  returnFormat: 'ZonedDateTime',
+  // These 'options' would be the defaults set by the Intl.DateTimeFormat API
+  // and could be overridden by the developer
+  /* options: {
+    calendar: 'gregory',
+    timeZone: 'America/New_York'
+  } */
+})
+const { value: firstCalendarDayOfMarch } = startOf({
+  date: firstOfMonth, // as a ZonedDateTime object it won't have to be parsed
+  unit: 'week',
+  returnFormat: 'standard', // an ISO 8601 string to send to the database
+  options, // uses returned options from first method to maintain consistency
+})
+// maybe?
+const myDate = startOf({ ...options })
+const value = myDate.asDate()
+const value2 = myDate.asEpoch()
+const tz = myDate.timeZone
+const { value, timeZone, calendar } = myDate
+```
+
+As mentioned in the Temporal documentation, the ISO 8601 and RFC 3339 industry standards for machine-readable serialization of dates and times are considering extension to include the timeZone and calendar as a part of the string. This would allow for a more complete representation of the date/time instance. This is something we should consider when returning a string representation of a date/time instance. (i.e. `2024-03-05T12:34:56.789Z[America/New_York][u-ca=gregory]`). While this may be acceptable for string based representations, where later access to timeZone and calendar may be required.
+
+## Possible Workflow
+
+### Workflow 'A'
+
+One possible way of handling this is for each method to be standalone, requiring basic arguments
+and options and returning a result and options. This would allow for a more flexible API, but
+may require more boilerplate code to be written by the developer.
+
+1. Method takes in a date/time value, arguments, and options
+   a. If value is already a ZonedDateTime, continue
+   b. If not a ZonedDateTime (i.e. string, epoch time, or Date object), convert to ZonedDateTime
+2. Method processes the ZonedDateTime
+3. Method returns the result and options
+   a. Result is in default or specified returnFormat
+   b. Options include timeZone and calendar
+
+### Workflow 'B'
+
+Another possible way of handling this is by utilizing a class that can be instantiated with the options and returnFormat. The class would then hold the 'value' internally, and the return of any method (aside from the `value` getter) would return the class instance, allowing one to chain methods together.
+
+I'm not sure what this looks like yet, but honestly not a fan. From a DX perspective it gives an initial appearance of ease of use, but seems like in the end it would be more difficult to work with, too difficult to see your progression in the process stack, and hard to identify error boundaries. It would also require a rather large object with a lot of methods, creating a lot of object overhead for simple processes, and make it difficult to treeshake.
+
+```js
+// maybe?
+const firstCalendarDayOfMarch = new TanStackTime('2024-03-05T12:34:56.789Z', {
+  timeZone: 'America/New_York',
+  calendar: 'gregory',
+  returnFormat: 'standard',
+})
+  .startOf({ unit: 'month' })
+  .startOf({ unit: 'week' })
+  .asDate()
+```
+
+## Parsing
+
+When parsing input date/time values, we need to consider the following:
+
+- If the input is numeric (epoch time), we need to convert it to a valid ZonedDateTime object
+- If the input is a string, we need to convert it to a valid ZonedDateTime object?
+- If the input is a Date object, we need to convert it to a valid ZonedDateTime object
+
+### Epoch parsing
+
+An epoch time is a numeric value that represents the number of milliseconds since the Unix epoch (1970-01-01T00:00:00.000Z). This is a common way of representing a date/time instance in a database. All we require, aside from it's value, is the timezone and calendar system in which it is being referenced.
+
+```js
+const timeZone = 'Asia/Tokyo'
+const calendar = 'japanese'
+const legacy = new Date(1726515625477)
+const zdt = Temporal.ZonedDateTime.from(
+  `${legacy.toJSON()}[${timeZone}][u-ca=${calendar}]`,
+)
+```
+
+### String parsing
+
+A string representation must be in the RFC 3339 standard format, or in the ISO 8601 extended format. This is the most common way of representing a date/time instance in a web application. All we require, aside from it's value, is the timezone and calendar system in which it is being referenced.
+
+```js
+const timeZone = 'Asia/Tokyo'
+const calendar = 'japanese'
+const legacy = '2024-03-05T12:34:56.789Z'
+const zdt = Temporal.ZonedDateTime.from(
+  `${legacy}[${timeZone}][u-ca=${calendar}]`,
+)
+```
+
+This assumes that the timeZone and calendar are not already included in the string. If they are, we can simply pass the string to the Temporal.ZonedDateTime.from() method.
+
+### Date parsing
+
+A Date object is a native object in JavaScript that represents a date/time instance. This is a common way of representing a date/time instance in a web application. All we require, aside from it's value, is the timezone and calendar system in which it is being referenced.
+
+```js
+const timeZone = 'Asia/Tokyo'
+const calendar = 'japanese'
+const legacy = new Date() // this would be passed into a method, but this is just an example
+const zdt = Temporal.ZonedDateTime.from(
+  `${legacy.toJSON()}[${timeZone}][u-ca=${calendar}]`,
+)
+```
diff --git a/README.md b/README.md
index e3c81954..7ecd7e46 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,3 @@
 # time
+
 🤖⏰ Headless utilities for building time and calendar components in TS/JS, React, Solid, Vue, Svelte and Angular
diff --git a/UTILITY_RESEARCH.md b/UTILITY_RESEARCH.md
new file mode 100644
index 00000000..f7346da1
--- /dev/null
+++ b/UTILITY_RESEARCH.md
@@ -0,0 +1,221 @@
+# Utility Research: d3-time & date-fns
+
+## Already Implemented ✅
+
+- `startOf` / `endOf` - Start/end of units
+- `add` / `subtract` - Date arithmetic
+- `round` - Round to nearest unit
+- `isBefore` / `isAfter` - Comparisons
+- `equals` - Equality with unit
+- `isSameOrBefore` / `isSameOrAfter` - Comparison with unit
+- `isBetween` / `intersects` - Range operations
+- `since` / `until` - Duration calculations
+- `format` - Date formatting
+
+## Recommended Additions
+
+### 1. Rounding & Boundaries (from d3-time)
+
+#### `ceil(date, unit)` - Round up to nearest unit ✅
+
+- **Use case**: "Next Monday", "Next hour", "Next month"
+- **Example**: `ceil('2024-03-15T14:30:00Z', { unit: 'hour' })` → `'2024-03-15T15:00:00Z'`
+- **Status**: High priority - complements `round` and `startOf`
+
+#### `floor(date, unit)` - Round down to nearest unit ✅
+
+- **Use case**: Similar to `startOf` but more explicit naming
+- **Note**: Could be alias for `startOf` or separate implementation
+- **Status**: Medium priority - `startOf` already covers this
+
+### 2. Range Generation (from d3-time & date-fns)
+
+#### `range(start, end, unit, step?)` - Generate array of dates
+
+- **Use case**: Generate dates for calendars, charts, time series
+- **Example**: `range('2024-03-01', '2024-03-31', { unit: 'day' })` → array of all days in March
+- **Example**: `range('2024-03-01T00:00:00Z', '2024-03-01T23:00:00Z', { unit: 'hour', step: 2 })` → every 2 hours
+- **Status**: High priority - very useful for UI components
+
+#### `eachDayOfInterval(range)` - Generate days in range
+
+- **Use case**: Calendar views, date pickers
+- **Status**: Medium priority - can use `range` with `unit: 'day'`
+
+#### `eachWeekOfInterval(range)` - Generate weeks in range
+
+- **Use case**: Week-based views
+- **Status**: Medium priority - can use `range` with `unit: 'week'`
+
+### 3. Interval Counting (from d3-time)
+
+#### `count(start, end, unit)` - Count intervals between dates
+
+- **Use case**: "How many days/months/weeks between two dates?"
+- **Example**: `count('2024-03-01', '2024-03-31', { unit: 'day' })` → `30`
+- **Note**: Different from `until` which returns duration - this counts discrete intervals
+- **Status**: High priority - common use case
+
+### 4. Date Clamping (from date-fns)
+
+#### `clamp(date, range)` - Ensure date is within range
+
+- **Use case**: Date picker min/max constraints, validation
+- **Example**: `clamp('2024-05-01', { start: '2024-03-01', end: '2024-04-30' })` → `'2024-04-30'`
+- **Status**: High priority - essential for date pickers
+
+### 5. Relative Time Checks (from date-fns)
+
+#### `isToday(date)` - Check if date is today
+
+- **Use case**: UI highlighting, relative formatting
+- **Status**: Medium priority - convenience function
+
+#### `isYesterday(date)` / `isTomorrow(date)` - Relative day checks
+
+- **Use case**: Relative date formatting ("yesterday", "tomorrow")
+- **Status**: Low priority - can be built with `isSameDay` + date arithmetic
+
+#### `isPast(date)` / `isFuture(date)` - Relative to now
+
+- **Use case**: Validation, conditional rendering
+- **Status**: Medium priority - common use case
+
+### 6. Day/Week Helpers (from date-fns)
+
+#### `isWeekend(date)` / `isWeekday(date)` - Day type checks
+
+- **Use case**: Business logic, calendar highlighting
+- **Status**: Medium priority - useful utility
+
+#### `isSameDay(date1, date2)` / `isSameMonth(date1, date2)` / `isSameYear(date1, date2)`
+
+- **Use case**: Convenience wrappers around `equals` with specific units
+- **Status**: Low priority - `equals` with unit already covers this
+
+### 7. Getters (from date-fns)
+
+#### `getDayOfYear(date)` - Get day of year (1-365/366)
+
+- **Use case**: Analytics, progress tracking
+- **Status**: Medium priority - niche but useful
+
+#### `getWeek(date)` - Get ISO week number
+
+- **Use case**: Week-based reporting, ISO 8601 compliance
+- **Status**: Medium priority - depends on week calculation needs
+
+#### `getWeeksInMonth(date)` - Count weeks in month
+
+- **Use case**: Calendar layout calculations
+- **Status**: Low priority - can be calculated
+
+### 8. Setters (from date-fns)
+
+#### `set(date, { year?, month?, day?, hour?, ... })` - Set date components
+
+- **Use case**: Date manipulation, form inputs
+- **Example**: `set('2024-03-15T14:00:00Z', { month: 5, day: 1 })` → `'2024-06-01T14:00:00Z'`
+- **Status**: High priority - very useful for date manipulation
+
+#### `setDate(date, day)` / `setMonth(date, month)` / `setYear(date, year)` - Individual setters
+
+- **Use case**: Convenience setters
+- **Status**: Medium priority - can use `set` with single property
+
+### 9. Min/Max Operations (from date-fns)
+
+#### `min(dates[])` - Find earliest date
+
+- **Use case**: Finding earliest date in array
+- **Status**: Medium priority - useful utility
+
+#### `max(dates[])` - Find latest date
+
+- **Use case**: Finding latest date in array
+- **Status**: Medium priority - useful utility
+
+### 10. Calendar Differences (from date-fns)
+
+#### `differenceInCalendarDays(date1, date2)` - Calendar day difference
+
+- **Use case**: "How many calendar days apart?" vs duration
+- **Note**: Different from `until` - counts calendar boundaries, not duration
+- **Status**: Medium priority - useful distinction from duration
+
+#### `differenceInCalendarMonths(date1, date2)` / `differenceInCalendarYears(date1, date2)`
+
+- **Use case**: Calendar-based differences
+- **Status**: Medium priority - similar to calendar days
+
+### 11. Offset/Step Operations (from d3-time)
+
+#### `offset(date, unit, step)` - Advance by step intervals
+
+- **Use case**: "Next 3 Mondays", "Every 15 minutes"
+- **Example**: `offset('2024-03-15T14:00:00Z', { unit: 'day', step: 7 })` → next week same time
+- **Status**: Medium priority - can use `add` with duration
+
+#### `every(unit, step)` - Create filtered interval
+
+- **Use case**: "Every 15 minutes", "Every 2 weeks"
+- **Status**: Low priority - advanced use case
+
+### 12. Conversion Helpers (from date-fns)
+
+#### `toDate(dateInput)` - Convert to Date object
+
+- **Use case**: Interop with Date-based libraries
+- **Status**: Low priority - `asDate()` already exists on results
+
+#### `fromUnixTime(timestamp)` - Create date from Unix timestamp
+
+- **Use case**: API responses, database timestamps
+- **Status**: Medium priority - common conversion
+
+#### `getUnixTime(date)` - Get Unix timestamp
+
+- **Use case**: API requests, database storage
+- **Status**: Medium priority - common conversion
+
+## Priority Recommendations
+
+### High Priority (Implement Soon)
+
+1. **`ceil`** - Round up to nearest unit (complements `round`)
+2. **`range`** - Generate date arrays (essential for calendars/charts)
+3. **`count`** - Count intervals between dates (common use case)
+4. **`clamp`** - Date clamping (essential for date pickers)
+5. **`set`** - Set date components (very useful for manipulation)
+
+### Medium Priority (Consider Adding)
+
+1. **`isPast` / `isFuture`** - Relative time checks
+2. **`isWeekend` / `isWeekday`** - Day type checks
+3. **`min` / `max`** - Array operations
+4. **`differenceInCalendarDays`** - Calendar differences
+5. **`fromUnixTime` / `getUnixTime`** - Unix timestamp conversion
+6. **`getDayOfYear`** - Day of year getter
+7. **`getWeek`** - ISO week number
+
+### Low Priority (Nice to Have)
+
+1. **`isToday` / `isYesterday` / `isTomorrow`** - Can be built from existing functions
+2. **`isSameDay` / `isSameMonth`** - Convenience wrappers around `equals`
+3. **`eachDayOfInterval`** - Can use `range` with `unit: 'day'`
+4. **`setDate` / `setMonth`** - Can use `set` with single property
+5. **`every`** - Advanced interval filtering
+
+## Implementation Notes
+
+- All functions should follow existing patterns:
+  - Accept `DateInput` (string | number | Date | ZonedDateTime)
+  - Support `DateOptions` (timeZone, calendar)
+  - Use Temporal API internally
+  - Return appropriate types (boolean, number, array, etc.)
+
+- Consider creating a `range` function that's flexible enough to replace multiple "each\*" functions
+
+- `ceil` should mirror `round` but always round up instead of nearest
+
+- `clamp` should work with the existing `Range` type
diff --git a/docs/adr/0001-one-kernel-modules-as-pipeline-stages.md b/docs/adr/0001-one-kernel-modules-as-pipeline-stages.md
new file mode 100644
index 00000000..c467a4a3
--- /dev/null
+++ b/docs/adr/0001-one-kernel-modules-as-pipeline-stages.md
@@ -0,0 +1,47 @@
+# One kernel; modules are declared pipeline stages, not a hook bus
+
+## Status
+
+accepted
+
+## Context
+
+TanStack Time bundles several time products (Calendar, Scheduler, Timeline/Gantt). The
+current `CalendarCore` is a ~3,800-line god class that fuses viewport, projection,
+recurrence, availability, dependencies, drag-resize, undo/redo, and timeline layout. We
+want to decompose it into a modular system (in the style of TanStack Table v9 / AG Grid
+modules) so unused features tree-shake away.
+
+## Decision
+
+There is exactly **one feature-agnostic kernel** (event collection + viewport + date-range
+projection + plain create/edit/remove). Calendar, Scheduler, and Timeline are **products** =
+kernel + a preset of modules + a view — not separate cores. This mirrors TanStack Table's
+single core; there is no `SortableTableCore`.
+
+Modules attach via **two ordered pipelines with kernel-defined stages and per-module
+priority within a stage** — not a `beforeWrite`/`afterWrite` hook bus run in registration
+order:
+
+- **Projection (read):** `recurrence-expand → clip-to-viewport → layout`. Scheduling adds an
+  inverse tail (`availability − busy → free slots`).
+- **Write (mutate):** `recurrence-materialize → dependency-transform → availability-validate
+  → commit → undo-snapshot/emit`.
+
+Rules: a user action produces **one atomic write batch** (original + cascaded writes) so
+undo/redo wraps the batch; **validation is veto-only and kept separate from transformation**;
+modules never call each other directly; stage order is kernel-defined and not
+module-overridable.
+
+## Considered Options
+
+- **Middleware / event-bus** (modules subscribe to lifecycle hooks, run in registration
+  order). Rejected: ordering becomes implicit and non-deterministic — the perennial
+  ESLint/Babel plugin-ordering problem — and the room-at-capacity-recurring-occurrence-with-
+  a-dependent scenario has exactly one correct order that registration order can't guarantee.
+
+## Consequences
+
+- The kernel must enumerate pipeline stages up front, which bounds what a third-party module
+  can do. Acceptable for a domain this constrained.
+- The kernel must stay strictly feature-agnostic so future non-calendar features reuse it.
diff --git a/docs/adr/0002-public-return-types-date-and-iso-strings.md b/docs/adr/0002-public-return-types-date-and-iso-strings.md
new file mode 100644
index 00000000..1e526fdb
--- /dev/null
+++ b/docs/adr/0002-public-return-types-date-and-iso-strings.md
@@ -0,0 +1,42 @@
+# Public return types: native `Date` for instants, ISO strings for civil values
+
+## Status
+
+accepted
+
+## Context
+
+Computations are done internally with Temporal (`ZonedDateTime`, `PlainDate`). The question
+is what types cross the public boundary. `Methodology.md` originally said "never expose
+Temporal; return Date or string" and sketched a `{ value, options }` tuple. The current code
+contradicts this — `Day.date`, `CalendarStore.currentPeriod`, and `activeDate` are
+`Temporal.PlainDate`. We also explored a `TimeValue` wrapper with `.toDate()`/`.toZonedDateTime()`
+converters.
+
+## Decision
+
+- **Instant-bearing results return a native `Date`.** This makes the Date Primitives a real
+  date-fns drop-in.
+- **Civil/plain values return ISO strings** — `YYYY-MM-DD` for dates, and string form for
+  periods/all-day boundaries. Never encode a civil date as a `Date`.
+- **Timezone and calendar are explicit inputs only** (defaulting from `Intl`), never present
+  in a return value. No `{ value, options }` tuple.
+- **Contract:** consumers must interpret returned `Date`s through TanStack Time's tz-aware
+  functions, never via native local accessors (`.getMonth()`, `.getDate()`, …).
+
+## Considered Options
+
+- **Temporal objects in the public API** — rejected: leaks the polyfill into consumer types
+  before Temporal is native.
+- **`TimeValue` wrapper** (canonical extended-ISO string + `to*` converters) — elegant and
+  removed the polyfill-lock-in concern, but rejected in favour of native `Date` for date-fns
+  drop-in compatibility and zero wrapper allocation.
+- **Uniform "everything is a `Date`" at UTC midnight for civil values** — rejected: forces
+  the all-day off-by-one onto every consumer who reads a civil `Date` with native accessors.
+
+## Consequences
+
+- `Day.date`, `currentPeriod`, `activeDate` must change from `Temporal.PlainDate` to ISO
+  strings.
+- A returned `Date` is an instant with no zone/calendar; correct rendering *requires* going
+  back through the library. This is a documented, load-bearing contract, not a convenience.
diff --git a/docs/adr/0003-logical-layout-with-percentage-prop-getter.md b/docs/adr/0003-logical-layout-with-percentage-prop-getter.md
new file mode 100644
index 00000000..0a4b5a02
--- /dev/null
+++ b/docs/adr/0003-logical-layout-with-percentage-prop-getter.md
@@ -0,0 +1,41 @@
+# Logical layout in the core; percentage prop-getter for positioning
+
+## Status
+
+accepted
+
+## Context
+
+The calendar code computes pixel geometry: `getUnavailableRanges(containerHeight) → {top,
+height}`, `getTimelineLayout() → {left, width}` in px, and pixel-based `getEventProps`. That
+makes the core a layout engine with baked-in assumptions (vertical, LTR, non-virtualized),
+which is what makes calendar libraries hard to restyle. We still want an *easy* way to
+position events, just not ready-made styles.
+
+## Decision
+
+The core/projection emits **logical layout only**: per event `{ startFraction, endFraction,
+column, columnCount }` (and `lane` for timelines), plus overlap resolution (interval-graph
+coloring) — the genuinely hard part the library owns.
+
+A **prop-getter** `getEventProps(event)` (TanStack idiom) returns a **percentage-based,
+`style`-ready object** the consumer spreads directly — no container dimensions required,
+responsive and zoom-proof via CSS. Orientation (vertical day/week vs horizontal timeline) is
+a view config that maps the time axis to `top/height` or `left/width`. The prop-getter lives
+with the **view**, not the feature-agnostic kernel, which stays pixel- and dimension-free.
+
+Minimum visible size for tiny events is the consumer's CSS (`min-height`), not injected
+pixels. A pixel helper, if ever needed, is a separate opt-in module.
+
+## Considered Options
+
+- **Pixel layout engine** (keep `containerHeight`/px outputs) — rejected: bakes in geometry
+  assumptions; the react-big-calendar restyling trap.
+- **CSS-Grid coordinates** (`gridRowStart`/`gridColumn`) — rejected: forces a grid model and
+  is awkward for sub-slot precision.
+
+## Consequences
+
+- `getUnavailableRanges` drops its `containerHeight` parameter; `getTimelineLayout` and
+  `getEventProps` return percentages/fractions, not pixels.
+- Raw logical fields stay public for power users (canvas/virtualized rendering).
diff --git a/docs/adr/0004-advisory-client-validation-authoritative-server-package.md b/docs/adr/0004-advisory-client-validation-authoritative-server-package.md
new file mode 100644
index 00000000..281d783a
--- /dev/null
+++ b/docs/adr/0004-advisory-client-validation-authoritative-server-package.md
@@ -0,0 +1,46 @@
+# Advisory client validation; authoritative server validation via a shared pure core
+
+## Status
+
+accepted
+
+## Context
+
+Fetching is TanStack Query's job (the kernel is sync over a supplied event collection). But
+conflict/availability validation needs a complete view of the affected range, and the client
+may hold only a partial cache and cannot see other users' concurrent writes. So client
+validation cannot be authoritative.
+
+## Decision
+
+- **Client validation is advisory** — instant UX feedback only. The kernel exposes
+  `getRequiredRange(write)`; the orchestration layer ensures that range is loaded (via Query)
+  before running sync validation; writes are applied optimistically and rolled back if the
+  server rejects.
+- **The server is authoritative.** A `@tanstack/time` package provides the same validation as
+  a **pure, isomorphic rule core** (`validate(write, events, config) → conflicts`) — no store,
+  no viewport, no DOM. This forces availability/dependency/recurrence validation to be
+  extracted from `CalendarCore` into pure functions both sides import. This extraction is
+  mandatory, not optional.
+- **Server package shape = rules + orchestration via an adapter.** The consumer implements
+  `loadEvents(range, ctx) → Event[]` against their own DB; `validateOnServer(write,
+  { loadEvents }, ctx)` computes the required range, loads, and runs the pure rules. The
+  library never opens a DB connection.
+- **Transactional isolation is the consumer's responsibility.** Read-validate-write is only
+  race-free inside one transaction with a consistent/locked view; the package provides rules,
+  not isolation. **Recommended backstop:** a DB exclusion constraint for raw time-overlap
+  (e.g. Postgres `EXCLUDE USING gist (resource_id WITH =, tstzrange(start,end) WITH &&)`); the
+  library rules cover what a constraint can't (availability windows, capacity, buffers,
+  dependencies).
+
+## Considered Options
+
+- **Authoritative client validation** — rejected: impossible under partial caches / multi-user.
+- **Batteries-included backend** (storage, transactions, route handlers, DB adapters) —
+  rejected: that's a backend framework, not a time library; ties us to specific databases.
+
+## Consequences
+
+- Validation logic must be pure and isomorphic — a real refactor of the current god class.
+- "Authoritative" is honest only when the consumer runs `loadEvents` + validate + write in one
+  isolated transaction. This must be documented prominently, not implied.
diff --git a/docs/adr/0005-v1-scope-calendar-product-react-only.md b/docs/adr/0005-v1-scope-calendar-product-react-only.md
new file mode 100644
index 00000000..1d8f794c
--- /dev/null
+++ b/docs/adr/0005-v1-scope-calendar-product-react-only.md
@@ -0,0 +1,65 @@
+# v1 scope: Calendar product, React-supported, some deferred
+
+## Status
+
+accepted
+
+## Context
+
+The designed surface is large: Date Primitives + a feature-agnostic kernel + ~6 modules +
+3 products (Calendar/Scheduler/Timeline) + several views + a server package + five framework
+adapters (the `package.json`/README advertise React, Solid, Vue, Svelte, Angular). Shipping
+all of it as v1 would take ~a year and leave every part shallow.
+
+However, the current `CalendarCore` already implements more than the original "Calendar only"
+plan. Dependencies (FS/SS/FF/SF), undo/redo, and timeline layout are all present and working.
+Removing them from the public API would be additional work with no user benefit, and they
+will naturally become modules once the kernel is extracted (ADR 0001). Keeping them in v1
+acknowledges the code we have.
+
+## Decision
+
+**In v1:**
+
+- **Date Primitives** (the date-fns alternative layer).
+- **The feature-agnostic kernel** (event collection + viewport + projection + plain CRUD +
+  `getRequiredRange`/rollback).
+- **The Calendar product** with modules: **recurrence** (UI-builder subset), **drag-resize**,
+  **advisory availability**.
+- **Dependencies / FS-SS-FF-SF** — already implemented; ships as part of the Calendar product
+  and becomes a proper module during modularization.
+- **undo/redo** — already implemented; ships in v1 and becomes a module during
+  modularization.
+- **Timeline/Gantt view** — already implemented; ships in v1 as a view, not a separate product.
+  The product split (Calendar vs Scheduler vs Timeline) remains architectural intent; the view
+  is what ships now.
+- **Isomorphic validation core + `@tanstack/time` server package** (`loadEvents` adapter).
+- **React adapter** as the supported target; **Solid** kept as the proof the core is
+  framework-agnostic, not a QA'd v1 target.
+- **Timezone- and calendar-system-correct internally**, but **QA'd/supported on Gregorian +
+  ISO-week + arbitrary IANA timezones/DST** for v1.
+
+**Deferred (explicit no for v1):**
+
+- **Scheduler** product — a preset over the same kernel/modules (ADR 0001), so it is a
+  fast-follow once Calendar proves the architecture.
+- **Vue / Svelte / Angular** adapters.
+- **`.ics` / full RFC 5545 RRULE interop.**
+- **Non-Gregorian calendar QA** (must keep *working* via Temporal; not a v1 support promise).
+
+## Considered Options
+
+- **Ship all three products + five adapters** — rejected: a year of shallow surface.
+- **Scheduler in v1** (Calendly was in the original pitch) — deferred: it is a preset over the
+  same kernel/modules (ADR 0001), so it is a fast-follow once Calendar proves the architecture.
+- **Cut dependencies/undo/timeline from v1** — rejected: they are already implemented and
+  removing them from the public API is wasted work. They become proper modules during
+  modularization instead.
+
+## Consequences
+
+- The `package.json`/README five-framework claim is aspirational, not v1 — update messaging to
+  avoid implying Vue/Svelte/Angular are ready.
+- Dependencies, undo/redo, and timeline view stay in the v1 public API but are treated as
+  "modularization targets" — they will be extracted into proper modules once the kernel is
+  established (ADR 0001).
diff --git a/docs/adr/0006-client-server-data-strategy.md b/docs/adr/0006-client-server-data-strategy.md
new file mode 100644
index 00000000..473712be
--- /dev/null
+++ b/docs/adr/0006-client-server-data-strategy.md
@@ -0,0 +1,49 @@
+# Client / server Data Strategy (computation push-down)
+
+## Status
+
+accepted
+
+## Context
+
+The calendar should run in two modes, like AG Grid's Client-Side vs Server-Side Row Model:
+everything in the browser, or backed by a server for large datasets / long recurrences /
+org-wide availability. The defining trait of the server mode is not "it fetches" — it is that
+*computation is delegated*.
+
+## Decision
+
+A pluggable **Data Strategy** (`client | server`) chosen at kernel construction decides *where
+each pipeline stage executes* (refines ADR 0001 and ADR 0004). The consumer's calendar API is
+identical in both modes.
+
+- **Delegatable stages** (run server-side in `server` mode): sourcing, recurrence-expansion,
+  availability/conflict, slot-generation. They run the **same pure Validation Core** as the
+  client (ADR 0004) — the logic is never written twice; "mode" is only *where it executes*.
+- **Always client-side:** clip-to-viewport and layout (% positioning is render-time).
+- **Transport:** the kernel calls `strategy.run(operation, request)`. The library defines the
+  serializable **operation contracts** (`expandRange`, `getConflicts`, `generateSlots`,
+  `validateWrite`) and ships the **server-side handlers**; the **consumer owns the transport**
+  (their endpoint, fetch/RPC, auth) — same philosophy as the `loadEvents` adapter. The request
+  descriptor doubles as the TanStack Query key, so `server` mode = Query + server-side core
+  with no new fetching machinery.
+- **Serializability is free:** ADR 0002 already restricts the boundary to native `Date` + ISO
+  strings + plain objects (no Temporal/class instances), which is exactly what lets a stage
+  cross the network.
+- **Validation authority by mode:** `client` mode — the client is the only validator, so
+  advisory and authoritative collapse (local-first / single-user). `server` mode — exactly
+  ADR 0004 (client advisory, server authoritative).
+
+## Considered Options
+
+- **Sourcing-only push-down** (server returns raw events, client computes) — rejected as a
+  "mode": it is essentially what Query + `getRequiredRange` already provide and does not scale
+  the compute.
+- **Library ships a concrete HTTP transport + routes** — rejected: re-opens the backend-
+  framework scope closed in ADR 0004.
+
+## Consequences
+
+- Each ADR 0001 pipeline stage must be implemented as a pure function with serializable
+  I/O so it can run in-process or be marshalled to the server.
+- The server package grows handlers per delegatable operation, not just `validateOnServer`.
diff --git a/docs/config.json b/docs/config.json
new file mode 100644
index 00000000..07800219
--- /dev/null
+++ b/docs/config.json
@@ -0,0 +1,56 @@
+{
+  "$schema": "https://raw.githubusercontent.com/TanStack/tanstack.com/main/tanstack-docs-config.schema.json",
+  "docSearch": {
+    "appId": "",
+    "apiKey": "",
+    "indexName": "tanstack-time"
+  },
+  "sections": [
+    {
+      "label": "Getting Started",
+      "children": [
+        {
+          "label": "Overview",
+          "to": "overview"
+        },
+        {
+          "label": "Installation",
+          "to": "installation"
+        },
+        {
+          "label": "Quick Start",
+          "to": "quick-start"
+        }
+      ],
+      "frameworks": [
+        {
+          "label": "react",
+          "children": [
+            {
+              "label": "React Adapter",
+              "to": "framework/react/adapter"
+            }
+          ]
+        },
+        {
+          "label": "solid",
+          "children": [
+            {
+              "label": "Solid Adapter",
+              "to": "framework/solid/adapter"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "label": "API Reference",
+      "children": [
+        {
+          "label": "Core API",
+          "to": "reference"
+        }
+      ]
+    }
+  ]
+}
diff --git a/docs/framework/react/adapter.md b/docs/framework/react/adapter.md
new file mode 100644
index 00000000..201026e1
--- /dev/null
+++ b/docs/framework/react/adapter.md
@@ -0,0 +1 @@
+# React Adapter
diff --git a/docs/framework/solid/adapter.md b/docs/framework/solid/adapter.md
new file mode 100644
index 00000000..f370e9ec
--- /dev/null
+++ b/docs/framework/solid/adapter.md
@@ -0,0 +1 @@
+# Solid Adapter
diff --git a/docs/framework/solid/reference/index.md b/docs/framework/solid/reference/index.md
new file mode 100644
index 00000000..4d2f7063
--- /dev/null
+++ b/docs/framework/solid/reference/index.md
@@ -0,0 +1,6 @@
+---
+id: "@tanstack/solid-time"
+title: "@tanstack/solid-time"
+---
+
+# @tanstack/solid-time
diff --git a/docs/installation.md b/docs/installation.md
new file mode 100644
index 00000000..c6ec5ddb
--- /dev/null
+++ b/docs/installation.md
@@ -0,0 +1,45 @@
+# Installation
+
+## Core Package
+
+```bash
+npm install @tanstack/time
+# or
+pnpm add @tanstack/time
+# or
+yarn add @tanstack/time
+```
+
+## React
+
+```bash
+npm install @tanstack/react-time
+# or
+pnpm add @tanstack/react-time
+# or
+yarn add @tanstack/react-time
+```
+
+## Solid
+
+```bash
+npm install @tanstack/solid-time
+# or
+pnpm add @tanstack/solid-time
+# or
+yarn add @tanstack/solid-time
+```
+
+## Devtools
+
+### React Devtools
+
+```bash
+npm install @tanstack/react-time-devtools
+```
+
+### Solid Devtools
+
+```bash
+npm install @tanstack/solid-time-devtools
+```
diff --git a/docs/overview.md b/docs/overview.md
new file mode 100644
index 00000000..6f387301
--- /dev/null
+++ b/docs/overview.md
@@ -0,0 +1,3 @@
+# TanStack Time
+
+🤖⏰ Headless utilities for building time and calendar components in TS/JS, React, Solid, Vue, Svelte and Angular
diff --git a/docs/quick-start.md b/docs/quick-start.md
new file mode 100644
index 00000000..89906578
--- /dev/null
+++ b/docs/quick-start.md
@@ -0,0 +1,13 @@
+# Quick Start
+
+## Core Usage
+
+## React Usage
+
+## Solid Usage
+
+## With Devtools
+
+### React
+
+### Solid
diff --git a/docs/reference/classes/CalendarCore.md b/docs/reference/classes/CalendarCore.md
new file mode 100644
index 00000000..7dd8ab8a
--- /dev/null
+++ b/docs/reference/classes/CalendarCore.md
@@ -0,0 +1,1768 @@
+---
+id: CalendarCore
+title: CalendarCore
+---
+
+# Class: CalendarCore\<TResource, TEvent\>
+
+Defined in: [calendar/calendar.ts:338](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L338)
+
+## Extends
+
+- [`DateCore`](DateCore.md)
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](../interfaces/Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](../interfaces/Event.md)\<`TResource`\>
+
+## Implements
+
+- `CalendarActions`\<`TResource`, `TEvent`\>
+
+## Constructors
+
+### Constructor
+
+```ts
+new CalendarCore<TResource, TEvent>(options): CalendarCore<TResource, TEvent>;
+```
+
+Defined in: [calendar/calendar.ts:405](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L405)
+
+#### Parameters
+
+##### options
+
+[`CalendarCoreOptions`](../interfaces/CalendarCoreOptions.md)\<`TResource`, `TEvent`\>
+
+#### Returns
+
+`CalendarCore`\<`TResource`, `TEvent`\>
+
+#### Overrides
+
+[`DateCore`](DateCore.md).[`constructor`](DateCore.md#constructor)
+
+## Properties
+
+### formatters
+
+```ts
+formatters: object;
+```
+
+Defined in: [calendar/date-core.ts:81](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L81)
+
+#### date
+
+```ts
+date: DateTimeFormat;
+```
+
+#### dateTime
+
+```ts
+dateTime: DateTimeFormat;
+```
+
+#### time
+
+```ts
+time: DateTimeFormat;
+```
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`formatters`](DateCore.md#formatters)
+
+***
+
+### options
+
+```ts
+options: ParsedCalendarCoreOptions<TResource, TEvent>;
+```
+
+Defined in: [calendar/calendar.ts:345](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L345)
+
+#### Overrides
+
+[`DateCore`](DateCore.md).[`options`](DateCore.md#options)
+
+***
+
+### store
+
+```ts
+store: Store<CalendarStore>;
+```
+
+Defined in: [calendar/date-core.ts:79](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L79)
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`store`](DateCore.md#store)
+
+## Methods
+
+### addEvent()
+
+```ts
+addEvent(event, options?): Promise<SaveEventResult>;
+```
+
+Defined in: [calendar/calendar.ts:2159](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L2159)
+
+Fetches events for the event's date range, validates placement
+constraints, and adds the event if valid. Returns a result
+indicating success or a validation error.
+
+#### Parameters
+
+##### event
+
+`TEvent`
+
+##### options?
+
+###### dependsOn?
+
+[`EventDependency`](../interfaces/EventDependency.md)[]
+
+#### Returns
+
+`Promise`\<[`SaveEventResult`](../type-aliases/SaveEventResult.md)\>
+
+#### Implementation of
+
+```ts
+CalendarActions.addEvent
+```
+
+***
+
+### canGoNextPeriod()
+
+```ts
+canGoNextPeriod(): boolean;
+```
+
+Defined in: [calendar/date-core.ts:446](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L446)
+
+#### Returns
+
+`boolean`
+
+#### Implementation of
+
+```ts
+CalendarActions.canGoNextPeriod
+```
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`canGoNextPeriod`](DateCore.md#cangonextperiod)
+
+***
+
+### canGoPreviousPeriod()
+
+```ts
+canGoPreviousPeriod(): boolean;
+```
+
+Defined in: [calendar/date-core.ts:415](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L415)
+
+#### Returns
+
+`boolean`
+
+#### Implementation of
+
+```ts
+CalendarActions.canGoPreviousPeriod
+```
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`canGoPreviousPeriod`](DateCore.md#cangopreviousperiod)
+
+***
+
+### canRedo()
+
+```ts
+canRedo(): boolean;
+```
+
+Defined in: [calendar/calendar.ts:985](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L985)
+
+Returns true when there is at least one action to redo.
+
+#### Returns
+
+`boolean`
+
+#### Implementation of
+
+```ts
+CalendarActions.canRedo
+```
+
+***
+
+### canUndo()
+
+```ts
+canUndo(): boolean;
+```
+
+Defined in: [calendar/calendar.ts:981](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L981)
+
+Returns true when there is at least one action to undo.
+
+#### Returns
+
+`boolean`
+
+#### Implementation of
+
+```ts
+CalendarActions.canUndo
+```
+
+***
+
+### changeViewMode()
+
+```ts
+changeViewMode(newViewMode): void;
+```
+
+Defined in: [calendar/date-core.ts:266](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L266)
+
+#### Parameters
+
+##### newViewMode
+
+[`ViewMode`](../interfaces/ViewMode.md)
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.changeViewMode
+```
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`changeViewMode`](DateCore.md#changeviewmode)
+
+***
+
+### commitAdd()
+
+```ts
+commitAdd(event): void;
+```
+
+Defined in: [calendar/calendar.ts:1032](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L1032)
+
+#### Parameters
+
+##### event
+
+`TEvent`
+
+#### Returns
+
+`void`
+
+***
+
+### commitUpdate()
+
+```ts
+commitUpdate(id, updates): void;
+```
+
+Defined in: [calendar/calendar.ts:1054](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L1054)
+
+#### Parameters
+
+##### id
+
+`string`
+
+##### updates
+
+`Partial`\<`Omit`\<`TEvent`, `"id"`\>\>
+
+#### Returns
+
+`void`
+
+***
+
+### createDependency()
+
+```ts
+createDependency(
+   sourceId, 
+   targetId, 
+   type): object;
+```
+
+Defined in: [calendar/calendar.ts:2660](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L2660)
+
+Creates a dependency link from source to target event.
+If the target event starts before the source event ends, it will optionally reschedule the target.
+
+#### Parameters
+
+##### sourceId
+
+`string`
+
+##### targetId
+
+`string`
+
+##### type
+
+[`DependencyType`](../type-aliases/DependencyType.md) = `'FS'`
+
+#### Returns
+
+`object`
+
+##### blocked
+
+```ts
+blocked: boolean;
+```
+
+##### error?
+
+```ts
+optional error: ResizeError;
+```
+
+#### Implementation of
+
+```ts
+CalendarActions.createDependency
+```
+
+***
+
+### createResizeController()
+
+```ts
+createResizeController(options): ResizeController<TResource, TEvent>;
+```
+
+Defined in: [calendar/calendar.ts:1846](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L1846)
+
+#### Parameters
+
+##### options
+
+[`ResizeControllerOptions`](../interfaces/ResizeControllerOptions.md) = `{}`
+
+#### Returns
+
+[`ResizeController`](ResizeController.md)\<`TResource`, `TEvent`\>
+
+***
+
+### editEvent()
+
+```ts
+editEvent(
+   eventId, 
+   updates, 
+options?): Promise<SaveEventResult>;
+```
+
+Defined in: [calendar/calendar.ts:2213](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L2213)
+
+Fetches events for the event's date range, validates move constraints
+(and cascading dependents), and updates the event if valid.
+Returns a result indicating success or a validation error.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### updates
+
+`Partial`\<`Omit`\<`TEvent`, `"id"`\>\>
+
+##### options?
+
+###### dependsOn?
+
+[`EventDependency`](../interfaces/EventDependency.md)[]
+
+#### Returns
+
+`Promise`\<[`SaveEventResult`](../type-aliases/SaveEventResult.md)\>
+
+#### Implementation of
+
+```ts
+CalendarActions.editEvent
+```
+
+***
+
+### editRecurringEvent()
+
+```ts
+editRecurringEvent(
+   eventId, 
+   updates, 
+options): Promise<SaveEventResult>;
+```
+
+Defined in: [calendar/calendar.ts:2311](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L2311)
+
+Edits one occurrence, this-and-following occurrences, or the whole recurring series.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### updates
+
+`Partial`\<`Omit`\<`TEvent`, `"id"`\>\>
+
+##### options
+
+###### dependsOn?
+
+[`EventDependency`](../interfaces/EventDependency.md)[]
+
+###### occurrenceStart?
+
+[`EventDateTimeInput`](../type-aliases/EventDateTimeInput.md)
+
+###### scope
+
+[`RecurrenceEditScope`](../type-aliases/RecurrenceEditScope.md)
+
+#### Returns
+
+`Promise`\<[`SaveEventResult`](../type-aliases/SaveEventResult.md)\>
+
+#### Implementation of
+
+```ts
+CalendarActions.editRecurringEvent
+```
+
+***
+
+### ensureRangeLoaded()
+
+```ts
+ensureRangeLoaded(): void;
+```
+
+Defined in: [calendar/calendar.ts:703](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L703)
+
+#### Returns
+
+`void`
+
+***
+
+### fetchEventsForRange()
+
+```ts
+fetchEventsForRange(start, end): Promise<void>;
+```
+
+Defined in: [calendar/calendar.ts:817](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L817)
+
+Fetches events for an arbitrary date range from the configured
+`fetchEvents` callback and merges them into the calendar.
+Resolves immediately if `fetchEvents` is not configured or the range
+is already loaded.
+
+#### Parameters
+
+##### start
+
+`string`
+
+##### end
+
+`string`
+
+#### Returns
+
+`Promise`\<`void`\>
+
+#### Implementation of
+
+```ts
+CalendarActions.fetchEventsForRange
+```
+
+***
+
+### formatCurrentPeriod()
+
+```ts
+formatCurrentPeriod(options?): string;
+```
+
+Defined in: [calendar/calendar.ts:887](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L887)
+
+Formats the current period as a human-readable "Month Year" string (e.g. "January 2024").
+
+#### Parameters
+
+##### options?
+
+###### locale?
+
+`string`
+
+#### Returns
+
+`string`
+
+#### Implementation of
+
+```ts
+CalendarActions.formatCurrentPeriod
+```
+
+***
+
+### formatDate()
+
+```ts
+formatDate(date): string;
+```
+
+Defined in: [calendar/date-core.ts:132](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L132)
+
+#### Parameters
+
+##### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+#### Returns
+
+`string`
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`formatDate`](DateCore.md#formatdate)
+
+***
+
+### formatDateTime()
+
+```ts
+formatDateTime(date): string;
+```
+
+Defined in: [calendar/date-core.ts:140](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L140)
+
+#### Parameters
+
+##### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+#### Returns
+
+`string`
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`formatDateTime`](DateCore.md#formatdatetime)
+
+***
+
+### formatPeriodLabel()
+
+```ts
+formatPeriodLabel(options?): string;
+```
+
+Defined in: [calendar/calendar.ts:868](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L868)
+
+Returns a human-readable label for the currently visible date range.
+
+#### Parameters
+
+##### options?
+
+###### locale?
+
+`string`
+
+#### Returns
+
+`string`
+
+#### Implementation of
+
+```ts
+CalendarActions.formatPeriodLabel
+```
+
+***
+
+### formatTime()
+
+```ts
+formatTime(date): string;
+```
+
+Defined in: [calendar/date-core.ts:136](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L136)
+
+#### Parameters
+
+##### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+#### Returns
+
+`string`
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`formatTime`](DateCore.md#formattime)
+
+***
+
+### getAllDayEventsByDate()
+
+```ts
+getAllDayEventsByDate(date): TEvent[];
+```
+
+Defined in: [calendar/calendar.ts:953](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L953)
+
+Retrieves all-day events occurring on a specific date (multi-day all-day segments included).
+
+#### Parameters
+
+##### date
+
+`string`
+
+#### Returns
+
+`TEvent`[]
+
+#### Implementation of
+
+```ts
+CalendarActions.getAllDayEventsByDate
+```
+
+***
+
+### getCalendarDays()
+
+```ts
+protected getCalendarDays(): PlainDate[];
+```
+
+Defined in: [calendar/calendar.ts:595](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L595)
+
+#### Returns
+
+`PlainDate`[]
+
+#### Overrides
+
+[`DateCore`](DateCore.md).[`getCalendarDays`](DateCore.md#getcalendardays)
+
+***
+
+### getDaysInRange()
+
+```ts
+getDaysInRange(start, end): object[];
+```
+
+Defined in: [calendar/calendar.ts:774](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L774)
+
+Returns Day objects for every date between `start` and `end` (inclusive),
+derived freshly from the current event state. Use this when rendering a
+buffered range that spans multiple periods (e.g. infinite scroll) so
+mutations (add/edit/remove) are reflected without manual cache invalidation.
+
+#### Parameters
+
+##### start
+
+`string`
+
+##### end
+
+`string`
+
+#### Returns
+
+`object`[]
+
+#### Implementation of
+
+```ts
+CalendarActions.getDaysInRange
+```
+
+***
+
+### getDaysNames()
+
+```ts
+getDaysNames(weekday): string[];
+```
+
+Defined in: [calendar/date-core.ts:255](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L255)
+
+#### Parameters
+
+##### weekday
+
+`"long"` | `"short"`
+
+#### Returns
+
+`string`[]
+
+#### Implementation of
+
+```ts
+CalendarActions.getDaysNames
+```
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`getDaysNames`](DateCore.md#getdaysnames)
+
+***
+
+### getDaysWithEvents()
+
+```ts
+getDaysWithEvents(): object[];
+```
+
+Defined in: [calendar/calendar.ts:764](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L764)
+
+#### Returns
+
+`object`[]
+
+***
+
+### getEventProps()
+
+```ts
+getEventProps(event): object;
+```
+
+Defined in: [calendar/calendar.ts:913](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L913)
+
+Retrieves styling properties for a specific event.
+
+#### Parameters
+
+##### event
+
+`TEvent`
+
+#### Returns
+
+`object`
+
+##### end
+
+```ts
+end: string;
+```
+
+##### isSplitEvent
+
+```ts
+isSplitEvent: boolean;
+```
+
+##### overlappingEvents
+
+```ts
+overlappingEvents: TEvent[];
+```
+
+##### start
+
+```ts
+start: string;
+```
+
+##### style?
+
+```ts
+optional style: object;
+```
+
+###### style.height
+
+```ts
+height: string;
+```
+
+###### style.left
+
+```ts
+left: string;
+```
+
+###### style.top
+
+```ts
+top: string;
+```
+
+###### style.width
+
+```ts
+width: string;
+```
+
+#### Implementation of
+
+```ts
+CalendarActions.getEventProps
+```
+
+***
+
+### getEvents()
+
+```ts
+getEvents(): TEvent[];
+```
+
+Defined in: [calendar/calendar.ts:1557](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L1557)
+
+Returns a snapshot of all events currently managed by the calendar (including those outside the visible range).
+
+#### Returns
+
+`TEvent`[]
+
+#### Implementation of
+
+```ts
+CalendarActions.getEvents
+```
+
+***
+
+### getEventsByDate()
+
+```ts
+getEventsByDate(date): TEvent[];
+```
+
+Defined in: [calendar/calendar.ts:941](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L941)
+
+Retrieves all events for a specific date.
+
+#### Parameters
+
+##### date
+
+`string`
+
+#### Returns
+
+`TEvent`[]
+
+#### Implementation of
+
+```ts
+CalendarActions.getEventsByDate
+```
+
+***
+
+### getEventsByResource()
+
+```ts
+getEventsByResource(): Map<TResource["id"], TEvent[]>;
+```
+
+Defined in: [calendar/calendar.ts:3021](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L3021)
+
+Groups visible events by resource, merging multi-day segments back to full-span events.
+
+#### Returns
+
+`Map`\<`TResource`\[`"id"`\], `TEvent`[]\>
+
+#### Implementation of
+
+```ts
+CalendarActions.getEventsByResource
+```
+
+***
+
+### getEventSegmentInfo()
+
+```ts
+getEventSegmentInfo(event): SegmentInfo;
+```
+
+Defined in: [calendar/calendar.ts:900](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L900)
+
+Returns segment info (split/occurrence metadata) for an event, normalising flexible datetime inputs.
+
+#### Parameters
+
+##### event
+
+`TEvent`
+
+#### Returns
+
+[`SegmentInfo`](../interfaces/SegmentInfo.md)
+
+#### Implementation of
+
+```ts
+CalendarActions.getEventSegmentInfo
+```
+
+***
+
+### getFirstDayOfMonth()
+
+```ts
+protected getFirstDayOfMonth(): PlainDate;
+```
+
+Defined in: [calendar/date-core.ts:144](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L144)
+
+#### Returns
+
+`PlainDate`
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`getFirstDayOfMonth`](DateCore.md#getfirstdayofmonth)
+
+***
+
+### getFirstDayOfWeek()
+
+```ts
+protected getFirstDayOfWeek(): PlainDate;
+```
+
+Defined in: [calendar/date-core.ts:152](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L152)
+
+#### Returns
+
+`PlainDate`
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`getFirstDayOfWeek`](DateCore.md#getfirstdayofweek)
+
+***
+
+### getLoadedRanges()
+
+```ts
+getLoadedRanges(): readonly object[];
+```
+
+Defined in: [calendar/calendar.ts:813](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L813)
+
+#### Returns
+
+readonly `object`[]
+
+***
+
+### getMasterEvent()
+
+```ts
+getMasterEvent(event): TEvent;
+```
+
+Defined in: [calendar/calendar.ts:1552](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L1552)
+
+Returns the master event for a given occurrence (or the event itself if it is already the master).
+
+#### Parameters
+
+##### event
+
+`TEvent`
+
+#### Returns
+
+`TEvent`
+
+#### Implementation of
+
+```ts
+CalendarActions.getMasterEvent
+```
+
+***
+
+### getTimelineLayout()
+
+```ts
+getTimelineLayout(): TimelineLayout<TResource, TEvent>;
+```
+
+Defined in: [calendar/calendar.ts:3025](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L3025)
+
+Computes horizontal timeline layout with event positions, lane assignments, and current time marker.
+
+#### Returns
+
+[`TimelineLayout`](../interfaces/TimelineLayout.md)\<`TResource`, `TEvent`\>
+
+#### Implementation of
+
+```ts
+CalendarActions.getTimelineLayout
+```
+
+***
+
+### getTimeSlots()
+
+```ts
+getTimeSlots(options?): TimeSlot[];
+```
+
+Defined in: [calendar/calendar.ts:937](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L937)
+
+Retrieves time slots for day view with configurable intervals.
+
+#### Parameters
+
+##### options?
+
+`TimeSlotOptions`
+
+#### Returns
+
+[`TimeSlot`](../interfaces/TimeSlot.md)[]
+
+#### Implementation of
+
+```ts
+CalendarActions.getTimeSlots
+```
+
+***
+
+### getUnavailabilityDetails()
+
+```ts
+getUnavailabilityDetails(
+   date, 
+   startMinutes, 
+   endMinutes, 
+   options?): object[];
+```
+
+Defined in: [calendar/calendar.ts:2906](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L2906)
+
+#### Parameters
+
+##### date
+
+`string`
+
+##### startMinutes
+
+`number`
+
+##### endMinutes
+
+`number`
+
+##### options?
+
+###### resourceIds?
+
+`TResource`\[`"id"`\][]
+
+#### Returns
+
+`object`[]
+
+***
+
+### getUnavailableRanges()
+
+```ts
+getUnavailableRanges(date, options?): UnavailableRange[];
+```
+
+Defined in: [calendar/calendar.ts:2817](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L2817)
+
+Retrieves unavailable time ranges for a specific date based on resource availability.
+
+#### Parameters
+
+##### date
+
+`string`
+
+##### options?
+
+###### containerHeight?
+
+`number`
+
+###### resourceIds?
+
+`TResource`\[`"id"`\][]
+
+#### Returns
+
+[`UnavailableRange`](../interfaces/UnavailableRange.md)[]
+
+#### Implementation of
+
+```ts
+CalendarActions.getUnavailableRanges
+```
+
+***
+
+### getWeekStartsOn()
+
+```ts
+getWeekStartsOn(): number;
+```
+
+Defined in: [calendar/date-core.ts:159](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L159)
+
+#### Returns
+
+`number`
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`getWeekStartsOn`](DateCore.md#getweekstartson)
+
+***
+
+### goToCurrentPeriod()
+
+```ts
+goToCurrentPeriod(): void;
+```
+
+Defined in: [calendar/date-core.ts:376](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L376)
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.goToCurrentPeriod
+```
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`goToCurrentPeriod`](DateCore.md#gotocurrentperiod)
+
+***
+
+### goToNextOccurrence()
+
+```ts
+goToNextOccurrence(eventId, fromDate?): void;
+```
+
+Defined in: [calendar/calendar.ts:1798](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L1798)
+
+Navigates to the next occurrence of a recurring event after fromDate (defaults to activeDate).
+No-op when the event is not recurring or has no future occurrences.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### fromDate?
+
+[`EventDateTimeInput`](../type-aliases/EventDateTimeInput.md)
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.goToNextOccurrence
+```
+
+***
+
+### goToNextPeriod()
+
+```ts
+goToNextPeriod(): void;
+```
+
+Defined in: [calendar/date-core.ts:328](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L328)
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.goToNextPeriod
+```
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`goToNextPeriod`](DateCore.md#gotonextperiod)
+
+***
+
+### goToPreviousOccurrence()
+
+```ts
+goToPreviousOccurrence(eventId, fromDate?): void;
+```
+
+Defined in: [calendar/calendar.ts:1822](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L1822)
+
+Navigates to the previous occurrence of a recurring event before fromDate (defaults to activeDate).
+No-op when the event is not recurring or is already at the first occurrence.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### fromDate?
+
+[`EventDateTimeInput`](../type-aliases/EventDateTimeInput.md)
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.goToPreviousOccurrence
+```
+
+***
+
+### goToPreviousPeriod()
+
+```ts
+goToPreviousPeriod(): void;
+```
+
+Defined in: [calendar/date-core.ts:280](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L280)
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.goToPreviousPeriod
+```
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`goToPreviousPeriod`](DateCore.md#gotopreviousperiod)
+
+***
+
+### goToSpecificPeriod()
+
+```ts
+goToSpecificPeriod(date): void;
+```
+
+Defined in: [calendar/date-core.ts:394](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L394)
+
+#### Parameters
+
+##### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.goToSpecificPeriod
+```
+
+#### Inherited from
+
+[`DateCore`](DateCore.md).[`goToSpecificPeriod`](DateCore.md#gotospecificperiod)
+
+***
+
+### groupDaysBy()
+
+```ts
+groupDaysBy(__namedParameters): (Day<TResource, TEvent> | null)[][];
+```
+
+Defined in: [calendar/calendar.ts:919](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L919)
+
+Groups days by a specified unit.
+
+#### Parameters
+
+##### \_\_namedParameters
+
+###### days
+
+([`Day`](../type-aliases/Day.md)\<`TResource`, `TEvent`\> \| `null`)[]
+
+###### fillMissingDays?
+
+`boolean` = `true`
+
+###### unit
+
+`"week"` \| `"workWeek"`
+
+#### Returns
+
+([`Day`](../type-aliases/Day.md)\<`TResource`, `TEvent`\> \| `null`)[][]
+
+#### Implementation of
+
+```ts
+CalendarActions.groupDaysBy
+```
+
+***
+
+### redo()
+
+```ts
+redo(): void;
+```
+
+Defined in: [calendar/calendar.ts:1023](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L1023)
+
+Re-applies the last undone action.
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.redo
+```
+
+***
+
+### removeEvent()
+
+```ts
+removeEvent(id): void;
+```
+
+Defined in: [calendar/calendar.ts:2790](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L2790)
+
+Removes an event by ID.
+
+#### Parameters
+
+##### id
+
+`string`
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.removeEvent
+```
+
+***
+
+### removeRecurringEvent()
+
+```ts
+removeRecurringEvent(eventId, options): void;
+```
+
+Defined in: [calendar/calendar.ts:2581](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L2581)
+
+Removes one occurrence, this-and-following occurrences, or the whole recurring series.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### options
+
+###### occurrenceStart?
+
+[`EventDateTimeInput`](../type-aliases/EventDateTimeInput.md)
+
+###### scope
+
+[`RecurrenceEditScope`](../type-aliases/RecurrenceEditScope.md)
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.removeRecurringEvent
+```
+
+***
+
+### setEvents()
+
+```ts
+setEvents(events): void;
+```
+
+Defined in: [calendar/calendar.ts:3819](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L3819)
+
+Replaces the current event list and invalidates availability caches.
+
+#### Parameters
+
+##### events
+
+`TEvent`[] | `null`
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.setEvents
+```
+
+***
+
+### setResources()
+
+```ts
+setResources(resources): void;
+```
+
+Defined in: [calendar/calendar.ts:3807](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L3807)
+
+Replaces the current resource list and invalidates availability caches.
+
+#### Parameters
+
+##### resources
+
+`TResource`[] | `null`
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.setResources
+```
+
+***
+
+### undo()
+
+```ts
+undo(): void;
+```
+
+Defined in: [calendar/calendar.ts:1014](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L1014)
+
+Reverts the last mutating action (commitAdd, commitUpdate, removeEvent).
+
+#### Returns
+
+`void`
+
+#### Implementation of
+
+```ts
+CalendarActions.undo
+```
+
+***
+
+### validateEventDependencies()
+
+```ts
+validateEventDependencies(event, dependsOn): object;
+```
+
+Defined in: [calendar/calendar.ts:2061](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L2061)
+
+Validates if placing an event with a specific start time satisfies all dependency constraints.
+
+#### Parameters
+
+##### event
+
+###### end
+
+`string`
+
+###### id?
+
+`string`
+
+###### start
+
+`string`
+
+###### title
+
+`string`
+
+##### dependsOn
+
+[`EventDependency`](../interfaces/EventDependency.md)[]
+
+#### Returns
+
+`object`
+
+##### error?
+
+```ts
+optional error: ResizeError;
+```
+
+##### valid
+
+```ts
+valid: boolean;
+```
+
+#### Implementation of
+
+```ts
+CalendarActions.validateEventDependencies
+```
+
+***
+
+### validateEventPlacement()
+
+```ts
+validateEventPlacement(event): object;
+```
+
+Defined in: [calendar/calendar.ts:2118](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L2118)
+
+Validates whether a new event (not yet added to the calendar) can be
+placed at the given time slot without violating resource availability.
+Use this for standalone validation before manually committing events.
+
+#### Parameters
+
+##### event
+
+###### consumption?
+
+`number`[]
+
+###### end
+
+`string`
+
+###### id?
+
+`string`
+
+###### resources?
+
+(`string` \| `TResource`)[]
+
+###### start
+
+`string`
+
+###### title
+
+`string`
+
+#### Returns
+
+`object`
+
+##### blocked
+
+```ts
+blocked: boolean;
+```
+
+##### message?
+
+```ts
+optional message: string;
+```
+
+#### Implementation of
+
+```ts
+CalendarActions.validateEventPlacement
+```
+
+***
+
+### validateMove()
+
+```ts
+validateMove(
+   eventId, 
+   newStart, 
+   newEnd, 
+   newResources?, 
+   newConsumption?): object;
+```
+
+Defined in: [calendar/calendar.ts:1852](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L1852)
+
+Checks whether moving `eventId` to `[newStart, newEnd]` — and cascading
+all finish-to-start dependents — would violate any resource availability.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### newStart
+
+`string`
+
+##### newEnd
+
+`string`
+
+##### newResources?
+
+(`string` \| `TResource`)[]
+
+##### newConsumption?
+
+`number`[]
+
+#### Returns
+
+`object`
+
+##### blocked
+
+```ts
+blocked: boolean;
+```
+
+##### blockedEventTitle?
+
+```ts
+optional blockedEventTitle: string;
+```
+
+##### message?
+
+```ts
+optional message: string;
+```
+
+#### Implementation of
+
+```ts
+CalendarActions.validateMove
+```
+
+***
+
+### validateResize()
+
+```ts
+validateResize(options): ValidateResizeResult;
+```
+
+Defined in: [calendar/calendar.ts:3296](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L3296)
+
+#### Parameters
+
+##### options
+
+[`ValidateResizeOptions`](../interfaces/ValidateResizeOptions.md)
+
+#### Returns
+
+[`ValidateResizeResult`](../interfaces/ValidateResizeResult.md)
diff --git a/docs/reference/classes/DateCore.md b/docs/reference/classes/DateCore.md
new file mode 100644
index 00000000..9176261f
--- /dev/null
+++ b/docs/reference/classes/DateCore.md
@@ -0,0 +1,326 @@
+---
+id: DateCore
+title: DateCore
+---
+
+# Abstract Class: DateCore
+
+Defined in: [calendar/date-core.ts:78](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L78)
+
+## Extended by
+
+- [`CalendarCore`](CalendarCore.md)
+
+## Constructors
+
+### Constructor
+
+```ts
+new DateCore(options): DateCore;
+```
+
+Defined in: [calendar/date-core.ts:86](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L86)
+
+#### Parameters
+
+##### options
+
+[`DateCoreOptions`](../interfaces/DateCoreOptions.md)
+
+#### Returns
+
+`DateCore`
+
+## Properties
+
+### formatters
+
+```ts
+formatters: object;
+```
+
+Defined in: [calendar/date-core.ts:81](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L81)
+
+#### date
+
+```ts
+date: DateTimeFormat;
+```
+
+#### dateTime
+
+```ts
+dateTime: DateTimeFormat;
+```
+
+#### time
+
+```ts
+time: DateTimeFormat;
+```
+
+***
+
+### options
+
+```ts
+options: ParsedDateCoreOptions;
+```
+
+Defined in: [calendar/date-core.ts:80](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L80)
+
+***
+
+### store
+
+```ts
+store: Store<CalendarStore>;
+```
+
+Defined in: [calendar/date-core.ts:79](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L79)
+
+## Methods
+
+### canGoNextPeriod()
+
+```ts
+canGoNextPeriod(): boolean;
+```
+
+Defined in: [calendar/date-core.ts:446](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L446)
+
+#### Returns
+
+`boolean`
+
+***
+
+### canGoPreviousPeriod()
+
+```ts
+canGoPreviousPeriod(): boolean;
+```
+
+Defined in: [calendar/date-core.ts:415](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L415)
+
+#### Returns
+
+`boolean`
+
+***
+
+### changeViewMode()
+
+```ts
+changeViewMode(newViewMode): void;
+```
+
+Defined in: [calendar/date-core.ts:266](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L266)
+
+#### Parameters
+
+##### newViewMode
+
+[`ViewMode`](../interfaces/ViewMode.md)
+
+#### Returns
+
+`void`
+
+***
+
+### formatDate()
+
+```ts
+formatDate(date): string;
+```
+
+Defined in: [calendar/date-core.ts:132](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L132)
+
+#### Parameters
+
+##### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+#### Returns
+
+`string`
+
+***
+
+### formatDateTime()
+
+```ts
+formatDateTime(date): string;
+```
+
+Defined in: [calendar/date-core.ts:140](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L140)
+
+#### Parameters
+
+##### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+#### Returns
+
+`string`
+
+***
+
+### formatTime()
+
+```ts
+formatTime(date): string;
+```
+
+Defined in: [calendar/date-core.ts:136](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L136)
+
+#### Parameters
+
+##### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+#### Returns
+
+`string`
+
+***
+
+### getCalendarDays()
+
+```ts
+protected getCalendarDays(): PlainDate[];
+```
+
+Defined in: [calendar/date-core.ts:163](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L163)
+
+#### Returns
+
+`PlainDate`[]
+
+***
+
+### getDaysNames()
+
+```ts
+getDaysNames(weekday): string[];
+```
+
+Defined in: [calendar/date-core.ts:255](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L255)
+
+#### Parameters
+
+##### weekday
+
+`"long"` | `"short"`
+
+#### Returns
+
+`string`[]
+
+***
+
+### getFirstDayOfMonth()
+
+```ts
+protected getFirstDayOfMonth(): PlainDate;
+```
+
+Defined in: [calendar/date-core.ts:144](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L144)
+
+#### Returns
+
+`PlainDate`
+
+***
+
+### getFirstDayOfWeek()
+
+```ts
+protected getFirstDayOfWeek(): PlainDate;
+```
+
+Defined in: [calendar/date-core.ts:152](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L152)
+
+#### Returns
+
+`PlainDate`
+
+***
+
+### getWeekStartsOn()
+
+```ts
+getWeekStartsOn(): number;
+```
+
+Defined in: [calendar/date-core.ts:159](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L159)
+
+#### Returns
+
+`number`
+
+***
+
+### goToCurrentPeriod()
+
+```ts
+goToCurrentPeriod(): void;
+```
+
+Defined in: [calendar/date-core.ts:376](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L376)
+
+#### Returns
+
+`void`
+
+***
+
+### goToNextPeriod()
+
+```ts
+goToNextPeriod(): void;
+```
+
+Defined in: [calendar/date-core.ts:328](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L328)
+
+#### Returns
+
+`void`
+
+***
+
+### goToPreviousPeriod()
+
+```ts
+goToPreviousPeriod(): void;
+```
+
+Defined in: [calendar/date-core.ts:280](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L280)
+
+#### Returns
+
+`void`
+
+***
+
+### goToSpecificPeriod()
+
+```ts
+goToSpecificPeriod(date): void;
+```
+
+Defined in: [calendar/date-core.ts:394](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L394)
+
+#### Parameters
+
+##### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+#### Returns
+
+`void`
diff --git a/docs/reference/classes/ResizeController.md b/docs/reference/classes/ResizeController.md
new file mode 100644
index 00000000..18391278
--- /dev/null
+++ b/docs/reference/classes/ResizeController.md
@@ -0,0 +1,280 @@
+---
+id: ResizeController
+title: ResizeController
+---
+
+# Class: ResizeController\<TResource, TEvent\>
+
+Defined in: [calendar/resizeController.ts:95](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L95)
+
+Framework-agnostic controller that owns:
+ - resize state machine (preview, blocked, lastValid)
+ - rAF coalescing for `mousemove`
+ - day-column registry + cached rects
+ - last-processed dedupe + last-emitted-error dedupe
+ - delegation to `CalendarCore.validateResize` / `commitUpdate`
+
+UI bindings (React, Solid, etc.) only need to:
+ 1. Subscribe to state changes and read `getSnapshot()`.
+ 2. Forward DOM `mousedown` to `start()`, then attach `handleMouseMove` /
+    `handleMouseUp` to `document` (the controller exposes these as bound
+    methods so the same reference can be used for `addEventListener` /
+    `removeEventListener`).
+ 3. Call `registerDayColumn(date, element)` from a ref callback.
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](../interfaces/Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](../interfaces/Event.md)\<`TResource`\>
+
+## Constructors
+
+### Constructor
+
+```ts
+new ResizeController<TResource, TEvent>(calendarCore, options): ResizeController<TResource, TEvent>;
+```
+
+Defined in: [calendar/resizeController.ts:134](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L134)
+
+#### Parameters
+
+##### calendarCore
+
+[`CalendarCore`](CalendarCore.md)\<`TResource`, `TEvent`\>
+
+##### options
+
+[`ResizeControllerOptions`](../interfaces/ResizeControllerOptions.md) = `{}`
+
+#### Returns
+
+`ResizeController`\<`TResource`, `TEvent`\>
+
+## Methods
+
+### cancel()
+
+```ts
+cancel(): void;
+```
+
+Defined in: [calendar/resizeController.ts:232](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L232)
+
+#### Returns
+
+`void`
+
+***
+
+### destroy()
+
+```ts
+destroy(): void;
+```
+
+Defined in: [calendar/resizeController.ts:242](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L242)
+
+#### Returns
+
+`void`
+
+***
+
+### getDayFromElement()
+
+```ts
+getDayFromElement(element): string | null;
+```
+
+Defined in: [calendar/resizeController.ts:185](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L185)
+
+#### Parameters
+
+##### element
+
+`HTMLElement`
+
+#### Returns
+
+`string` \| `null`
+
+***
+
+### getDayFromPoint()
+
+```ts
+getDayFromPoint(clientX): string | null;
+```
+
+Defined in: [calendar/resizeController.ts:170](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L170)
+
+#### Parameters
+
+##### clientX
+
+`number`
+
+#### Returns
+
+`string` \| `null`
+
+***
+
+### getOptions()
+
+```ts
+getOptions(): ResizeControllerOptions;
+```
+
+Defined in: [calendar/resizeController.ts:158](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L158)
+
+#### Returns
+
+[`ResizeControllerOptions`](../interfaces/ResizeControllerOptions.md)
+
+***
+
+### getSnapshot()
+
+```ts
+getSnapshot(): ResizeState;
+```
+
+Defined in: [calendar/resizeController.ts:152](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L152)
+
+#### Returns
+
+[`ResizeState`](../interfaces/ResizeState.md)
+
+***
+
+### handleMouseMove()
+
+```ts
+handleMouseMove(e): void;
+```
+
+Defined in: [calendar/resizeController.ts:254](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L254)
+
+#### Parameters
+
+##### e
+
+`MouseEvent`
+
+#### Returns
+
+`void`
+
+***
+
+### handleMouseUp()
+
+```ts
+handleMouseUp(): void;
+```
+
+Defined in: [calendar/resizeController.ts:269](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L269)
+
+Mouse-up handler. Auto-attached by `start()`; commits if the preview
+differs from the original event range, then detaches DOM listeners.
+
+#### Returns
+
+`void`
+
+***
+
+### registerDayColumn()
+
+```ts
+registerDayColumn(date, element): void;
+```
+
+Defined in: [calendar/resizeController.ts:162](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L162)
+
+#### Parameters
+
+##### date
+
+`string`
+
+##### element
+
+`HTMLElement` | `null`
+
+#### Returns
+
+`void`
+
+***
+
+### setOptions()
+
+```ts
+setOptions(options): void;
+```
+
+Defined in: [calendar/resizeController.ts:154](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L154)
+
+#### Parameters
+
+##### options
+
+[`ResizeControllerOptions`](../interfaces/ResizeControllerOptions.md)
+
+#### Returns
+
+`void`
+
+***
+
+### start()
+
+```ts
+start(args): boolean;
+```
+
+Defined in: [calendar/resizeController.ts:192](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L192)
+
+#### Parameters
+
+##### args
+
+[`ResizeStartArgs`](../interfaces/ResizeStartArgs.md)
+
+#### Returns
+
+`boolean`
+
+***
+
+### subscribe()
+
+```ts
+subscribe(listener): () => void;
+```
+
+Defined in: [calendar/resizeController.ts:145](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L145)
+
+#### Parameters
+
+##### listener
+
+[`ResizeListener`](../type-aliases/ResizeListener.md)
+
+#### Returns
+
+```ts
+(): void;
+```
+
+##### Returns
+
+`void`
diff --git a/docs/reference/functions/add.md b/docs/reference/functions/add.md
new file mode 100644
index 00000000..b3b99a48
--- /dev/null
+++ b/docs/reference/functions/add.md
@@ -0,0 +1,89 @@
+---
+id: add
+title: add
+---
+
+# Function: add()
+
+```ts
+function add(input, options): object;
+```
+
+Defined in: [date/add/add.ts:13](https://github.com/TanStack/time/blob/main/packages/time/src/date/add/add.ts#L13)
+
+add
+Adds a duration to a date/time instance
+
+## Parameters
+
+### input
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`AddOptions`](../interfaces/AddOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/calculateDeltaMinutesFromPixels.md b/docs/reference/functions/calculateDeltaMinutesFromPixels.md
new file mode 100644
index 00000000..2059ee2b
--- /dev/null
+++ b/docs/reference/functions/calculateDeltaMinutesFromPixels.md
@@ -0,0 +1,33 @@
+---
+id: calculateDeltaMinutesFromPixels
+title: calculateDeltaMinutesFromPixels
+---
+
+# Function: calculateDeltaMinutesFromPixels()
+
+```ts
+function calculateDeltaMinutesFromPixels(
+   deltaPixels, 
+   containerHeight, 
+   minutesInDay): number;
+```
+
+Defined in: [calendar/getResizeProps.ts:167](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L167)
+
+## Parameters
+
+### deltaPixels
+
+`number`
+
+### containerHeight
+
+`number`
+
+### minutesInDay
+
+`number` = `...`
+
+## Returns
+
+`number`
diff --git a/docs/reference/functions/calculateDeltaMinutesFromPixelsHorizontal.md b/docs/reference/functions/calculateDeltaMinutesFromPixelsHorizontal.md
new file mode 100644
index 00000000..ba56199b
--- /dev/null
+++ b/docs/reference/functions/calculateDeltaMinutesFromPixelsHorizontal.md
@@ -0,0 +1,33 @@
+---
+id: calculateDeltaMinutesFromPixelsHorizontal
+title: calculateDeltaMinutesFromPixelsHorizontal
+---
+
+# Function: calculateDeltaMinutesFromPixelsHorizontal()
+
+```ts
+function calculateDeltaMinutesFromPixelsHorizontal(
+   deltaPixels, 
+   containerWidth, 
+   totalMinutesInView): number;
+```
+
+Defined in: [calendar/getResizeProps.ts:175](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L175)
+
+## Parameters
+
+### deltaPixels
+
+`number`
+
+### containerWidth
+
+`number`
+
+### totalMinutesInView
+
+`number`
+
+## Returns
+
+`number`
diff --git a/docs/reference/functions/calculateGhostPreviewStyle.md b/docs/reference/functions/calculateGhostPreviewStyle.md
new file mode 100644
index 00000000..bf815c36
--- /dev/null
+++ b/docs/reference/functions/calculateGhostPreviewStyle.md
@@ -0,0 +1,24 @@
+---
+id: calculateGhostPreviewStyle
+title: calculateGhostPreviewStyle
+---
+
+# Function: calculateGhostPreviewStyle()
+
+```ts
+function calculateGhostPreviewStyle(options): PositionStyle | null;
+```
+
+Defined in: [calendar/getResizeProps.ts:381](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L381)
+
+Calculates the ghost preview style for a day that doesn't have an existing segment
+
+## Parameters
+
+### options
+
+[`GhostPreviewOptions`](../interfaces/GhostPreviewOptions.md)
+
+## Returns
+
+[`PositionStyle`](../interfaces/PositionStyle.md) \| `null`
diff --git a/docs/reference/functions/calculateResizedEvent.md b/docs/reference/functions/calculateResizedEvent.md
new file mode 100644
index 00000000..174368fc
--- /dev/null
+++ b/docs/reference/functions/calculateResizedEvent.md
@@ -0,0 +1,22 @@
+---
+id: calculateResizedEvent
+title: calculateResizedEvent
+---
+
+# Function: calculateResizedEvent()
+
+```ts
+function calculateResizedEvent(options): ResizedEventResult;
+```
+
+Defined in: [calendar/getResizeProps.ts:58](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L58)
+
+## Parameters
+
+### options
+
+`CalculateResizedEventOptions`
+
+## Returns
+
+`ResizedEventResult`
diff --git a/docs/reference/functions/calculateSegmentResizePreview.md b/docs/reference/functions/calculateSegmentResizePreview.md
new file mode 100644
index 00000000..b3649af6
--- /dev/null
+++ b/docs/reference/functions/calculateSegmentResizePreview.md
@@ -0,0 +1,24 @@
+---
+id: calculateSegmentResizePreview
+title: calculateSegmentResizePreview
+---
+
+# Function: calculateSegmentResizePreview()
+
+```ts
+function calculateSegmentResizePreview(options): SegmentResizePreview;
+```
+
+Defined in: [calendar/getResizeProps.ts:299](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L299)
+
+Calculates the resize preview state for a segment on a specific day
+
+## Parameters
+
+### options
+
+[`ResizePreviewOptions`](../interfaces/ResizePreviewOptions.md)
+
+## Returns
+
+[`SegmentResizePreview`](../interfaces/SegmentResizePreview.md)
diff --git a/docs/reference/functions/calculateTimelineResizePreview.md b/docs/reference/functions/calculateTimelineResizePreview.md
new file mode 100644
index 00000000..e611a1f2
--- /dev/null
+++ b/docs/reference/functions/calculateTimelineResizePreview.md
@@ -0,0 +1,24 @@
+---
+id: calculateTimelineResizePreview
+title: calculateTimelineResizePreview
+---
+
+# Function: calculateTimelineResizePreview()
+
+```ts
+function calculateTimelineResizePreview(options): TimelineResizePreviewStyle;
+```
+
+Defined in: [calendar/getResizeProps.ts:452](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L452)
+
+Calculates left/width percentages for timeline resize preview
+
+## Parameters
+
+### options
+
+[`TimelineResizePreviewOptions`](../interfaces/TimelineResizePreviewOptions.md)
+
+## Returns
+
+[`TimelineResizePreviewStyle`](../interfaces/TimelineResizePreviewStyle.md)
diff --git a/docs/reference/functions/ceil.md b/docs/reference/functions/ceil.md
new file mode 100644
index 00000000..8705374f
--- /dev/null
+++ b/docs/reference/functions/ceil.md
@@ -0,0 +1,86 @@
+---
+id: ceil
+title: ceil
+---
+
+# Function: ceil()
+
+```ts
+function ceil(input, options): object;
+```
+
+Defined in: [date/ceil/ceil.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/date/ceil/ceil.ts#L18)
+
+## Parameters
+
+### input
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`CeilOptions`](../interfaces/CeilOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/clamp.md b/docs/reference/functions/clamp.md
new file mode 100644
index 00000000..e48a12a0
--- /dev/null
+++ b/docs/reference/functions/clamp.md
@@ -0,0 +1,86 @@
+---
+id: clamp
+title: clamp
+---
+
+# Function: clamp()
+
+```ts
+function clamp(input, options): object;
+```
+
+Defined in: [date/clamp/clamp.ts:10](https://github.com/TanStack/time/blob/main/packages/time/src/date/clamp/clamp.ts#L10)
+
+## Parameters
+
+### input
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`ClampOptions`](../interfaces/ClampOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/count.md b/docs/reference/functions/count.md
new file mode 100644
index 00000000..837d1f21
--- /dev/null
+++ b/docs/reference/functions/count.md
@@ -0,0 +1,33 @@
+---
+id: count
+title: count
+---
+
+# Function: count()
+
+```ts
+function count(
+   start, 
+   end, 
+   options): number;
+```
+
+Defined in: [date/count/count.ts:19](https://github.com/TanStack/time/blob/main/packages/time/src/date/count/count.ts#L19)
+
+## Parameters
+
+### start
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### end
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`CountOptions`](../interfaces/CountOptions.md)
+
+## Returns
+
+`number`
diff --git a/docs/reference/functions/endOf.md b/docs/reference/functions/endOf.md
new file mode 100644
index 00000000..6f8e8077
--- /dev/null
+++ b/docs/reference/functions/endOf.md
@@ -0,0 +1,89 @@
+---
+id: endOf
+title: endOf
+---
+
+# Function: endOf()
+
+```ts
+function endOf(input, options): object;
+```
+
+Defined in: [date/endOf/endOf.ts:23](https://github.com/TanStack/time/blob/main/packages/time/src/date/endOf/endOf.ts#L23)
+
+endOf
+Returns the end of a given unit for a date/time instance
+
+## Parameters
+
+### input
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`EndOfOptions`](../interfaces/EndOfOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/equals.md b/docs/reference/functions/equals.md
new file mode 100644
index 00000000..7e9724aa
--- /dev/null
+++ b/docs/reference/functions/equals.md
@@ -0,0 +1,41 @@
+---
+id: equals
+title: equals
+---
+
+# Function: equals()
+
+```ts
+function equals(
+   date1, 
+   date2, 
+   unit, 
+   options?): boolean;
+```
+
+Defined in: [date/equals/equals.ts:22](https://github.com/TanStack/time/blob/main/packages/time/src/date/equals/equals.ts#L22)
+
+equals
+Returns true if two date/time instances are equal at the specified unit level
+
+## Parameters
+
+### date1
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### date2
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### unit
+
+[`EqualsUnit`](../type-aliases/EqualsUnit.md)
+
+### options?
+
+[`EqualsOptions`](../interfaces/EqualsOptions.md)
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/format.md b/docs/reference/functions/format.md
new file mode 100644
index 00000000..1c20d4a2
--- /dev/null
+++ b/docs/reference/functions/format.md
@@ -0,0 +1,33 @@
+---
+id: format
+title: format
+---
+
+# Function: format()
+
+```ts
+function format(date, formatOptions?): string;
+```
+
+Defined in: [date/format/format.ts:32](https://github.com/TanStack/time/blob/main/packages/time/src/date/format/format.ts#L32)
+
+format
+Formats a date/time instance using Intl.DateTimeFormat
+
+## Parameters
+
+### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+The date to format
+
+### formatOptions?
+
+[`FormatDateOptions`](../interfaces/FormatDateOptions.md)
+
+Formatting options including type, locale, and Intl.DateTimeFormat options
+
+## Returns
+
+`string`
diff --git a/docs/reference/functions/formatEventTimeRange.md b/docs/reference/functions/formatEventTimeRange.md
new file mode 100644
index 00000000..2a6d8f36
--- /dev/null
+++ b/docs/reference/functions/formatEventTimeRange.md
@@ -0,0 +1,37 @@
+---
+id: formatEventTimeRange
+title: formatEventTimeRange
+---
+
+# Function: formatEventTimeRange()
+
+```ts
+function formatEventTimeRange(
+   start, 
+   end, 
+   options): FormattedEventTime;
+```
+
+Defined in: [calendar/getResizeProps.ts:562](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L562)
+
+Formats an event's time range for display
+For multi-day events: includes date and time
+For single-day events: includes only time (unless alwaysShowDate is true)
+
+## Parameters
+
+### start
+
+`string`
+
+### end
+
+`string`
+
+### options
+
+[`FormatEventTimeOptions`](../interfaces/FormatEventTimeOptions.md) = `{}`
+
+## Returns
+
+[`FormattedEventTime`](../interfaces/FormattedEventTime.md)
diff --git a/docs/reference/functions/fromUnixTime.md b/docs/reference/functions/fromUnixTime.md
new file mode 100644
index 00000000..1c2b14e1
--- /dev/null
+++ b/docs/reference/functions/fromUnixTime.md
@@ -0,0 +1,86 @@
+---
+id: fromUnixTime
+title: fromUnixTime
+---
+
+# Function: fromUnixTime()
+
+```ts
+function fromUnixTime(timestamp, options?): object;
+```
+
+Defined in: [date/fromUnixTime/fromUnixTime.ts:8](https://github.com/TanStack/time/blob/main/packages/time/src/date/fromUnixTime/fromUnixTime.ts#L8)
+
+## Parameters
+
+### timestamp
+
+`number`
+
+### options?
+
+[`FromUnixTimeOptions`](../interfaces/FromUnixTimeOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/generateDateRange.md b/docs/reference/functions/generateDateRange.md
new file mode 100644
index 00000000..8780d59c
--- /dev/null
+++ b/docs/reference/functions/generateDateRange.md
@@ -0,0 +1,26 @@
+---
+id: generateDateRange
+title: generateDateRange
+---
+
+# Function: generateDateRange()
+
+```ts
+function generateDateRange(start, end): PlainDate[];
+```
+
+Defined in: [calendar/generateDateRange.ts:3](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/generateDateRange.ts#L3)
+
+## Parameters
+
+### start
+
+`string`
+
+### end
+
+`string`
+
+## Returns
+
+`PlainDate`[]
diff --git a/docs/reference/functions/getDayOfYear.md b/docs/reference/functions/getDayOfYear.md
new file mode 100644
index 00000000..8c25cd72
--- /dev/null
+++ b/docs/reference/functions/getDayOfYear.md
@@ -0,0 +1,26 @@
+---
+id: getDayOfYear
+title: getDayOfYear
+---
+
+# Function: getDayOfYear()
+
+```ts
+function getDayOfYear(date, options?): number;
+```
+
+Defined in: [date/getDayOfYear/getDayOfYear.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/getDayOfYear/getDayOfYear.ts#L7)
+
+## Parameters
+
+### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options?
+
+[`GetDayOfYearOptions`](../interfaces/GetDayOfYearOptions.md)
+
+## Returns
+
+`number`
diff --git a/docs/reference/functions/getEventDisplayTimeRange.md b/docs/reference/functions/getEventDisplayTimeRange.md
new file mode 100644
index 00000000..883a7db8
--- /dev/null
+++ b/docs/reference/functions/getEventDisplayTimeRange.md
@@ -0,0 +1,42 @@
+---
+id: getEventDisplayTimeRange
+title: getEventDisplayTimeRange
+---
+
+# Function: getEventDisplayTimeRange()
+
+```ts
+function getEventDisplayTimeRange(options): EventTimeRange;
+```
+
+Defined in: [calendar/getResizeProps.ts:513](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L513)
+
+Gets the time range to display for an event, considering resize state
+
+## Parameters
+
+### options
+
+#### isBeingResized?
+
+`boolean`
+
+#### originalEnd
+
+`string`
+
+#### originalStart
+
+`string`
+
+#### previewEnd?
+
+`string`
+
+#### previewStart?
+
+`string`
+
+## Returns
+
+[`EventTimeRange`](../interfaces/EventTimeRange.md)
diff --git a/docs/reference/functions/getEventProps.md b/docs/reference/functions/getEventProps.md
new file mode 100644
index 00000000..9232db4c
--- /dev/null
+++ b/docs/reference/functions/getEventProps.md
@@ -0,0 +1,73 @@
+---
+id: getEventProps
+title: getEventProps
+---
+
+# Function: getEventProps()
+
+```ts
+function getEventProps(
+   eventMap, 
+   event, 
+   state, 
+   options): 
+  | {
+  end: string;
+  isSplitEvent: boolean;
+  overlappingEvents: Event<Resource>[];
+  start: string;
+}
+  | {
+  end: string;
+  isSplitEvent: boolean;
+  overlappingEvents: Event<Resource>[];
+  start: string;
+  style: {
+     height: string;
+     left: string;
+     top: string;
+     width: string;
+  };
+};
+```
+
+Defined in: [calendar/getEventProps.ts:59](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getEventProps.ts#L59)
+
+## Parameters
+
+### eventMap
+
+`Map`\<`string`, [`Event`](../interfaces/Event.md)\<[`Resource`](../interfaces/Resource.md)\>[]\>
+
+### event
+
+[`Event`](../interfaces/Event.md)
+
+### state
+
+[`CalendarStore`](../interfaces/CalendarStore.md)
+
+### options
+
+`GetEventPropsOptions`
+
+## Returns
+
+  \| \{
+  `end`: `string`;
+  `isSplitEvent`: `boolean`;
+  `overlappingEvents`: [`Event`](../interfaces/Event.md)\<[`Resource`](../interfaces/Resource.md)\>[];
+  `start`: `string`;
+\}
+  \| \{
+  `end`: `string`;
+  `isSplitEvent`: `boolean`;
+  `overlappingEvents`: [`Event`](../interfaces/Event.md)\<[`Resource`](../interfaces/Resource.md)\>[];
+  `start`: `string`;
+  `style`: \{
+     `height`: `string`;
+     `left`: `string`;
+     `top`: `string`;
+     `width`: `string`;
+  \};
+\}
diff --git a/docs/reference/functions/getResizeHandleStyle.md b/docs/reference/functions/getResizeHandleStyle.md
new file mode 100644
index 00000000..30db97a0
--- /dev/null
+++ b/docs/reference/functions/getResizeHandleStyle.md
@@ -0,0 +1,22 @@
+---
+id: getResizeHandleStyle
+title: getResizeHandleStyle
+---
+
+# Function: getResizeHandleStyle()
+
+```ts
+function getResizeHandleStyle(edge): ResizeHandleStyle;
+```
+
+Defined in: [calendar/getResizeProps.ts:194](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L194)
+
+## Parameters
+
+### edge
+
+[`ResizeEdge`](../type-aliases/ResizeEdge.md)
+
+## Returns
+
+[`ResizeHandleStyle`](../interfaces/ResizeHandleStyle.md)
diff --git a/docs/reference/functions/getSegmentInfo.md b/docs/reference/functions/getSegmentInfo.md
new file mode 100644
index 00000000..6b6bb801
--- /dev/null
+++ b/docs/reference/functions/getSegmentInfo.md
@@ -0,0 +1,36 @@
+---
+id: getSegmentInfo
+title: getSegmentInfo
+---
+
+# Function: getSegmentInfo()
+
+```ts
+function getSegmentInfo(event): SegmentInfo;
+```
+
+Defined in: [calendar/getResizeProps.ts:230](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L230)
+
+## Parameters
+
+### event
+
+#### _originalEnd?
+
+`string`
+
+#### _originalStart?
+
+`string`
+
+#### end
+
+`string`
+
+#### start
+
+`string`
+
+## Returns
+
+[`SegmentInfo`](../interfaces/SegmentInfo.md)
diff --git a/docs/reference/functions/getTimeClient.md b/docs/reference/functions/getTimeClient.md
new file mode 100644
index 00000000..44148d53
--- /dev/null
+++ b/docs/reference/functions/getTimeClient.md
@@ -0,0 +1,18 @@
+---
+id: getTimeClient
+title: getTimeClient
+---
+
+# Function: getTimeClient()
+
+```ts
+function getTimeClient(): TimeClient;
+```
+
+Defined in: [client/TimeClient.ts:87](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L87)
+
+Get the global TimeClient instance
+
+## Returns
+
+`TimeClient`
diff --git a/docs/reference/functions/getTimeSlots.md b/docs/reference/functions/getTimeSlots.md
new file mode 100644
index 00000000..f88c1fc4
--- /dev/null
+++ b/docs/reference/functions/getTimeSlots.md
@@ -0,0 +1,35 @@
+---
+id: getTimeSlots
+title: getTimeSlots
+---
+
+# Function: getTimeSlots()
+
+```ts
+function getTimeSlots(locale, options?): TimeSlot[];
+```
+
+Defined in: [calendar/getTimeSlots.ts:19](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getTimeSlots.ts#L19)
+
+Generates time slots for calendar day views.
+Returns an array of time slots with labels formatted according to the locale.
+
+## Parameters
+
+### locale
+
+`string`
+
+The locale to use for formatting time labels (BCP 47 format)
+
+### options?
+
+`TimeSlotOptions`
+
+Configuration options for time slots
+
+## Returns
+
+[`TimeSlot`](../interfaces/TimeSlot.md)[]
+
+Array of time slots with hour, minute, and formatted label
diff --git a/docs/reference/functions/getUnixTime.md b/docs/reference/functions/getUnixTime.md
new file mode 100644
index 00000000..f51520a1
--- /dev/null
+++ b/docs/reference/functions/getUnixTime.md
@@ -0,0 +1,26 @@
+---
+id: getUnixTime
+title: getUnixTime
+---
+
+# Function: getUnixTime()
+
+```ts
+function getUnixTime(date, options?): number;
+```
+
+Defined in: [date/getUnixTime/getUnixTime.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/getUnixTime/getUnixTime.ts#L7)
+
+## Parameters
+
+### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options?
+
+[`GetUnixTimeOptions`](../interfaces/GetUnixTimeOptions.md)
+
+## Returns
+
+`number`
diff --git a/docs/reference/functions/getWeek.md b/docs/reference/functions/getWeek.md
new file mode 100644
index 00000000..f4f8d7b4
--- /dev/null
+++ b/docs/reference/functions/getWeek.md
@@ -0,0 +1,26 @@
+---
+id: getWeek
+title: getWeek
+---
+
+# Function: getWeek()
+
+```ts
+function getWeek(date, options?): number;
+```
+
+Defined in: [date/getWeek/getWeek.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/getWeek/getWeek.ts#L7)
+
+## Parameters
+
+### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options?
+
+[`GetWeekOptions`](../interfaces/GetWeekOptions.md)
+
+## Returns
+
+`number`
diff --git a/docs/reference/functions/groupDaysBy.md b/docs/reference/functions/groupDaysBy.md
new file mode 100644
index 00000000..85f7a639
--- /dev/null
+++ b/docs/reference/functions/groupDaysBy.md
@@ -0,0 +1,32 @@
+---
+id: groupDaysBy
+title: groupDaysBy
+---
+
+# Function: groupDaysBy()
+
+```ts
+function groupDaysBy<TResource, TEvent>(__namedParameters): (Day<TResource, TEvent> | null)[][];
+```
+
+Defined in: [calendar/groupDaysBy.ts:37](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/groupDaysBy.ts#L37)
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](../interfaces/Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](../interfaces/Event.md)\<`TResource`\> = [`Event`](../interfaces/Event.md)\<`TResource`\>
+
+## Parameters
+
+### \_\_namedParameters
+
+[`GroupDaysByProps`](../type-aliases/GroupDaysByProps.md)\<`TResource`, `TEvent`\>
+
+## Returns
+
+([`Day`](../type-aliases/Day.md)\<`TResource`, `TEvent`\> \| `null`)[][]
diff --git a/docs/reference/functions/intersects.md b/docs/reference/functions/intersects.md
new file mode 100644
index 00000000..bdec851b
--- /dev/null
+++ b/docs/reference/functions/intersects.md
@@ -0,0 +1,33 @@
+---
+id: intersects
+title: intersects
+---
+
+# Function: intersects()
+
+```ts
+function intersects(date, options): boolean;
+```
+
+Defined in: [date/intersects/intersects.ts:16](https://github.com/TanStack/time/blob/main/packages/time/src/date/intersects/intersects.ts#L16)
+
+intersects
+Returns true if the date/time instance intersects with the range (i.e., is within or equal to the range boundaries)
+
+## Parameters
+
+### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+The date to check
+
+### options
+
+[`IntersectsOptions`](../interfaces/IntersectsOptions.md)
+
+Options including range, timeZone and calendar
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/isAfter.md b/docs/reference/functions/isAfter.md
new file mode 100644
index 00000000..c1c06abe
--- /dev/null
+++ b/docs/reference/functions/isAfter.md
@@ -0,0 +1,36 @@
+---
+id: isAfter
+title: isAfter
+---
+
+# Function: isAfter()
+
+```ts
+function isAfter(
+   date1, 
+   date2, 
+   options?): boolean;
+```
+
+Defined in: [date/isAfter/isAfter.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/isAfter/isAfter.ts#L12)
+
+isAfter
+Returns true if the first date/time instance is after the second date/time instance
+
+## Parameters
+
+### date1
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### date2
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options?
+
+[`IsAfterOptions`](../interfaces/IsAfterOptions.md)
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/isBefore.md b/docs/reference/functions/isBefore.md
new file mode 100644
index 00000000..796f97f1
--- /dev/null
+++ b/docs/reference/functions/isBefore.md
@@ -0,0 +1,36 @@
+---
+id: isBefore
+title: isBefore
+---
+
+# Function: isBefore()
+
+```ts
+function isBefore(
+   date1, 
+   date2, 
+   options?): boolean;
+```
+
+Defined in: [date/isBefore/isBefore.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/isBefore/isBefore.ts#L12)
+
+isBefore
+Returns true if the first date/time instance is before the second date/time instance
+
+## Parameters
+
+### date1
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### date2
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options?
+
+[`IsBeforeOptions`](../interfaces/IsBeforeOptions.md)
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/isBetween.md b/docs/reference/functions/isBetween.md
new file mode 100644
index 00000000..880bfb4a
--- /dev/null
+++ b/docs/reference/functions/isBetween.md
@@ -0,0 +1,33 @@
+---
+id: isBetween
+title: isBetween
+---
+
+# Function: isBetween()
+
+```ts
+function isBetween(date, options): boolean;
+```
+
+Defined in: [date/isBetween/isBetween.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/date/isBetween/isBetween.ts#L18)
+
+isBetween
+Returns true if the date/time instance is between the start and end of the range
+
+## Parameters
+
+### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+The date to check
+
+### options
+
+[`IsBetweenOptions`](../interfaces/IsBetweenOptions.md)
+
+Options including timeZone, calendar, and inclusivity
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/isFuture.md b/docs/reference/functions/isFuture.md
new file mode 100644
index 00000000..b981355c
--- /dev/null
+++ b/docs/reference/functions/isFuture.md
@@ -0,0 +1,26 @@
+---
+id: isFuture
+title: isFuture
+---
+
+# Function: isFuture()
+
+```ts
+function isFuture(date, options?): boolean;
+```
+
+Defined in: [date/isFuture/isFuture.ts:8](https://github.com/TanStack/time/blob/main/packages/time/src/date/isFuture/isFuture.ts#L8)
+
+## Parameters
+
+### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options?
+
+[`IsFutureOptions`](../interfaces/IsFutureOptions.md)
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/isLeapYear.md b/docs/reference/functions/isLeapYear.md
new file mode 100644
index 00000000..0665af2b
--- /dev/null
+++ b/docs/reference/functions/isLeapYear.md
@@ -0,0 +1,29 @@
+---
+id: isLeapYear
+title: isLeapYear
+---
+
+# Function: isLeapYear()
+
+```ts
+function isLeapYear(date, options?): boolean;
+```
+
+Defined in: [date/isLeapYear/isLeapYear.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/isLeapYear/isLeapYear.ts#L11)
+
+isLeapYear
+Returns true if the year of the given date is a leap year
+
+## Parameters
+
+### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options?
+
+[`IsLeapYearOptions`](../interfaces/IsLeapYearOptions.md)
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/isMultiDayEvent.md b/docs/reference/functions/isMultiDayEvent.md
new file mode 100644
index 00000000..65524615
--- /dev/null
+++ b/docs/reference/functions/isMultiDayEvent.md
@@ -0,0 +1,28 @@
+---
+id: isMultiDayEvent
+title: isMultiDayEvent
+---
+
+# Function: isMultiDayEvent()
+
+```ts
+function isMultiDayEvent(start, end): boolean;
+```
+
+Defined in: [calendar/getResizeProps.ts:498](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L498)
+
+Checks if an event spans multiple days
+
+## Parameters
+
+### start
+
+`string`
+
+### end
+
+`string`
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/isPast.md b/docs/reference/functions/isPast.md
new file mode 100644
index 00000000..9451235b
--- /dev/null
+++ b/docs/reference/functions/isPast.md
@@ -0,0 +1,26 @@
+---
+id: isPast
+title: isPast
+---
+
+# Function: isPast()
+
+```ts
+function isPast(date, options?): boolean;
+```
+
+Defined in: [date/isPast/isPast.ts:8](https://github.com/TanStack/time/blob/main/packages/time/src/date/isPast/isPast.ts#L8)
+
+## Parameters
+
+### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options?
+
+[`IsPastOptions`](../interfaces/IsPastOptions.md)
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/isSameOrAfter.md b/docs/reference/functions/isSameOrAfter.md
new file mode 100644
index 00000000..1ff85269
--- /dev/null
+++ b/docs/reference/functions/isSameOrAfter.md
@@ -0,0 +1,36 @@
+---
+id: isSameOrAfter
+title: isSameOrAfter
+---
+
+# Function: isSameOrAfter()
+
+```ts
+function isSameOrAfter(
+   date1, 
+   date2, 
+   options): boolean;
+```
+
+Defined in: [date/isSameOrAfter/isSameOrAfter.ts:25](https://github.com/TanStack/time/blob/main/packages/time/src/date/isSameOrAfter/isSameOrAfter.ts#L25)
+
+isSameOrAfter
+Returns true if the first date/time instance is the same as or after the second date/time instance at the specified unit level
+
+## Parameters
+
+### date1
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### date2
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`IsSameOrAfterOptions`](../interfaces/IsSameOrAfterOptions.md)
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/isSameOrBefore.md b/docs/reference/functions/isSameOrBefore.md
new file mode 100644
index 00000000..352fc993
--- /dev/null
+++ b/docs/reference/functions/isSameOrBefore.md
@@ -0,0 +1,36 @@
+---
+id: isSameOrBefore
+title: isSameOrBefore
+---
+
+# Function: isSameOrBefore()
+
+```ts
+function isSameOrBefore(
+   date1, 
+   date2, 
+   options): boolean;
+```
+
+Defined in: [date/isSameOrBefore/isSameOrBefore.ts:25](https://github.com/TanStack/time/blob/main/packages/time/src/date/isSameOrBefore/isSameOrBefore.ts#L25)
+
+isSameOrBefore
+Returns true if the first date/time instance is the same as or before the second date/time instance at the specified unit level
+
+## Parameters
+
+### date1
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### date2
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`IsSameOrBeforeOptions`](../interfaces/IsSameOrBeforeOptions.md)
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/isWeekend.md b/docs/reference/functions/isWeekend.md
new file mode 100644
index 00000000..152c2758
--- /dev/null
+++ b/docs/reference/functions/isWeekend.md
@@ -0,0 +1,29 @@
+---
+id: isWeekend
+title: isWeekend
+---
+
+# Function: isWeekend()
+
+```ts
+function isWeekend(date, options?): boolean;
+```
+
+Defined in: [date/isWeekend/isWeekend.ts:14](https://github.com/TanStack/time/blob/main/packages/time/src/date/isWeekend/isWeekend.ts#L14)
+
+isWeekend
+Returns true if the date falls on a weekend based on locale-specific week info
+
+## Parameters
+
+### date
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options?
+
+[`IsWeekendOptions`](../interfaces/IsWeekendOptions.md)
+
+## Returns
+
+`boolean`
diff --git a/docs/reference/functions/max.md b/docs/reference/functions/max.md
new file mode 100644
index 00000000..c3572adc
--- /dev/null
+++ b/docs/reference/functions/max.md
@@ -0,0 +1,86 @@
+---
+id: max
+title: max
+---
+
+# Function: max()
+
+```ts
+function max(dates, options?): object;
+```
+
+Defined in: [date/max/max.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/max/max.ts#L9)
+
+## Parameters
+
+### dates
+
+[`DateInput`](../type-aliases/DateInput.md)[]
+
+### options?
+
+[`MaxOptions`](../interfaces/MaxOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/min.md b/docs/reference/functions/min.md
new file mode 100644
index 00000000..2c2d494a
--- /dev/null
+++ b/docs/reference/functions/min.md
@@ -0,0 +1,86 @@
+---
+id: min
+title: min
+---
+
+# Function: min()
+
+```ts
+function min(dates, options?): object;
+```
+
+Defined in: [date/min/min.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/min/min.ts#L9)
+
+## Parameters
+
+### dates
+
+[`DateInput`](../type-aliases/DateInput.md)[]
+
+### options?
+
+[`MinOptions`](../interfaces/MinOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/range.md b/docs/reference/functions/range.md
new file mode 100644
index 00000000..ed18d0a0
--- /dev/null
+++ b/docs/reference/functions/range.md
@@ -0,0 +1,26 @@
+---
+id: range
+title: range
+---
+
+# Function: range()
+
+```ts
+function range(options): object[];
+```
+
+Defined in: [date/range/range.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/date/range/range.ts#L18)
+
+range
+Generates an array of dates from start to end at the specified step interval.
+The range is inclusive of both start and end (if end falls exactly on a step).
+
+## Parameters
+
+### options
+
+[`RangeOptions`](../interfaces/RangeOptions.md)
+
+## Returns
+
+`object`[]
diff --git a/docs/reference/functions/round.md b/docs/reference/functions/round.md
new file mode 100644
index 00000000..6156d618
--- /dev/null
+++ b/docs/reference/functions/round.md
@@ -0,0 +1,89 @@
+---
+id: round
+title: round
+---
+
+# Function: round()
+
+```ts
+function round(input, options): object;
+```
+
+Defined in: [date/round/round.ts:27](https://github.com/TanStack/time/blob/main/packages/time/src/date/round/round.ts#L27)
+
+round
+Returns the date/time instance rounded to the nearest unit
+
+## Parameters
+
+### input
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`RoundOptions`](../interfaces/RoundOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/set.md b/docs/reference/functions/set.md
new file mode 100644
index 00000000..ae22335a
--- /dev/null
+++ b/docs/reference/functions/set.md
@@ -0,0 +1,86 @@
+---
+id: set
+title: set
+---
+
+# Function: set()
+
+```ts
+function set(input, options): object;
+```
+
+Defined in: [date/set/set.ts:21](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L21)
+
+## Parameters
+
+### input
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`SetOptions`](../interfaces/SetOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/since.md b/docs/reference/functions/since.md
new file mode 100644
index 00000000..3e051bea
--- /dev/null
+++ b/docs/reference/functions/since.md
@@ -0,0 +1,37 @@
+---
+id: since
+title: since
+---
+
+# Function: since()
+
+```ts
+function since(
+   start, 
+   end, 
+   options): number;
+```
+
+Defined in: [date/since/since.ts:15](https://github.com/TanStack/time/blob/main/packages/time/src/date/since/since.ts#L15)
+
+since
+Returns the duration from the first date/time instance since the second date/time instance
+(equivalent to: how long has it been since the second date, from the first date's perspective)
+
+## Parameters
+
+### start
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### end
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`SinceOptions`](../interfaces/SinceOptions.md)
+
+## Returns
+
+`number`
diff --git a/docs/reference/functions/splitMultiDayEvents.md b/docs/reference/functions/splitMultiDayEvents.md
new file mode 100644
index 00000000..60d9dbf4
--- /dev/null
+++ b/docs/reference/functions/splitMultiDayEvents.md
@@ -0,0 +1,36 @@
+---
+id: splitMultiDayEvents
+title: splitMultiDayEvents
+---
+
+# Function: splitMultiDayEvents()
+
+```ts
+function splitMultiDayEvents<TResource, TEvent>(event, timeZone): TEvent[];
+```
+
+Defined in: [calendar/splitMultiDayEvents.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/splitMultiDayEvents.ts#L5)
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](../interfaces/Resource.md) = [`Resource`](../interfaces/Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](../interfaces/Event.md)\<`TResource`\> = [`Event`](../interfaces/Event.md)\<`TResource`\>
+
+## Parameters
+
+### event
+
+`TEvent`
+
+### timeZone
+
+`TimeZoneLike`
+
+## Returns
+
+`TEvent`[]
diff --git a/docs/reference/functions/startOf.md b/docs/reference/functions/startOf.md
new file mode 100644
index 00000000..d0d5e8af
--- /dev/null
+++ b/docs/reference/functions/startOf.md
@@ -0,0 +1,89 @@
+---
+id: startOf
+title: startOf
+---
+
+# Function: startOf()
+
+```ts
+function startOf(input, options): object;
+```
+
+Defined in: [date/startOf/startOf.ts:23](https://github.com/TanStack/time/blob/main/packages/time/src/date/startOf/startOf.ts#L23)
+
+startOf
+Returns the start of a given unit for a date/time instance
+
+## Parameters
+
+### input
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`StartOfOptions`](../interfaces/StartOfOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/subtract.md b/docs/reference/functions/subtract.md
new file mode 100644
index 00000000..2beb5399
--- /dev/null
+++ b/docs/reference/functions/subtract.md
@@ -0,0 +1,89 @@
+---
+id: subtract
+title: subtract
+---
+
+# Function: subtract()
+
+```ts
+function subtract(input, options): object;
+```
+
+Defined in: [date/subtract/subtract.ts:13](https://github.com/TanStack/time/blob/main/packages/time/src/date/subtract/subtract.ts#L13)
+
+subtract
+Subtracts a duration from a date/time instance
+
+## Parameters
+
+### input
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`SubtractOptions`](../interfaces/SubtractOptions.md)
+
+## Returns
+
+`object`
+
+### asDate()
+
+```ts
+asDate: () => Date;
+```
+
+#### Returns
+
+`Date`
+
+### asEpoch()
+
+```ts
+asEpoch: () => number;
+```
+
+#### Returns
+
+`number`
+
+### asZonedDateTime()
+
+```ts
+asZonedDateTime: () => ZonedDateTime;
+```
+
+#### Returns
+
+`ZonedDateTime`
+
+### calendar
+
+```ts
+calendar: string = options.calendar;
+```
+
+### options
+
+```ts
+options: ResolvedDateOperationOptions;
+```
+
+### returnFormat
+
+```ts
+returnFormat: ReturnFormat;
+```
+
+### timeZone
+
+```ts
+timeZone: string = options.timeZone;
+```
+
+### value
+
+```ts
+value: string;
+```
diff --git a/docs/reference/functions/toDate.md b/docs/reference/functions/toDate.md
new file mode 100644
index 00000000..7d3b41a6
--- /dev/null
+++ b/docs/reference/functions/toDate.md
@@ -0,0 +1,26 @@
+---
+id: toDate
+title: toDate
+---
+
+# Function: toDate()
+
+```ts
+function toDate(value): Date;
+```
+
+Defined in: [date/parse/parse.ts:221](https://github.com/TanStack/time/blob/main/packages/time/src/date/parse/parse.ts#L221)
+
+toDate
+Converts a flexible date/time input (string, Date, or epoch number)
+into a local-time Date at midnight, extracting only the date portion.
+
+## Parameters
+
+### value
+
+`string` | `number` | `Date`
+
+## Returns
+
+`Date`
diff --git a/docs/reference/functions/toPlainDateString.md b/docs/reference/functions/toPlainDateString.md
new file mode 100644
index 00000000..5acab94b
--- /dev/null
+++ b/docs/reference/functions/toPlainDateString.md
@@ -0,0 +1,26 @@
+---
+id: toPlainDateString
+title: toPlainDateString
+---
+
+# Function: toPlainDateString()
+
+```ts
+function toPlainDateString(value): string;
+```
+
+Defined in: [date/parse/parse.ts:201](https://github.com/TanStack/time/blob/main/packages/time/src/date/parse/parse.ts#L201)
+
+toPlainDateString
+Converts a flexible date/time input (string, Date, or epoch number)
+into a Temporal.PlainDate-compatible ISO string (YYYY-MM-DD).
+
+## Parameters
+
+### value
+
+`string` | `number` | `Date`
+
+## Returns
+
+`string`
diff --git a/docs/reference/functions/toPlainDateTimeString.md b/docs/reference/functions/toPlainDateTimeString.md
new file mode 100644
index 00000000..a90b8174
--- /dev/null
+++ b/docs/reference/functions/toPlainDateTimeString.md
@@ -0,0 +1,26 @@
+---
+id: toPlainDateTimeString
+title: toPlainDateTimeString
+---
+
+# Function: toPlainDateTimeString()
+
+```ts
+function toPlainDateTimeString(value): string;
+```
+
+Defined in: [date/parse/parse.ts:191](https://github.com/TanStack/time/blob/main/packages/time/src/date/parse/parse.ts#L191)
+
+toPlainDateTimeString
+Converts a flexible date/time input (string, Date, or epoch number)
+into a Temporal.PlainDateTime-compatible ISO string (YYYY-MM-DDTHH:mm:ss).
+
+## Parameters
+
+### value
+
+`string` | `number` | `Date`
+
+## Returns
+
+`string`
diff --git a/docs/reference/functions/toPlainTimeString.md b/docs/reference/functions/toPlainTimeString.md
new file mode 100644
index 00000000..ee99e560
--- /dev/null
+++ b/docs/reference/functions/toPlainTimeString.md
@@ -0,0 +1,26 @@
+---
+id: toPlainTimeString
+title: toPlainTimeString
+---
+
+# Function: toPlainTimeString()
+
+```ts
+function toPlainTimeString(value): string;
+```
+
+Defined in: [date/parse/parse.ts:211](https://github.com/TanStack/time/blob/main/packages/time/src/date/parse/parse.ts#L211)
+
+toPlainTimeString
+Converts a flexible date/time input (string, Date, or epoch number)
+into a time-only string (HH:mm).
+
+## Parameters
+
+### value
+
+`string` | `number` | `Date`
+
+## Returns
+
+`string`
diff --git a/docs/reference/functions/until.md b/docs/reference/functions/until.md
new file mode 100644
index 00000000..298e3e3e
--- /dev/null
+++ b/docs/reference/functions/until.md
@@ -0,0 +1,36 @@
+---
+id: until
+title: until
+---
+
+# Function: until()
+
+```ts
+function until(
+   start, 
+   end, 
+   options): number;
+```
+
+Defined in: [date/until/until.ts:14](https://github.com/TanStack/time/blob/main/packages/time/src/date/until/until.ts#L14)
+
+until
+Returns the duration from the first date/time instance until the second date/time instance
+
+## Parameters
+
+### start
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### end
+
+[`DateInput`](../type-aliases/DateInput.md)
+
+### options
+
+[`UntilOptions`](../interfaces/UntilOptions.md)
+
+## Returns
+
+`number`
diff --git a/docs/reference/index.md b/docs/reference/index.md
new file mode 100644
index 00000000..cc22762b
--- /dev/null
+++ b/docs/reference/index.md
@@ -0,0 +1,167 @@
+---
+id: "@tanstack/time"
+title: "@tanstack/time"
+---
+
+# @tanstack/time
+
+## Classes
+
+- [CalendarCore](classes/CalendarCore.md)
+- [DateCore](classes/DateCore.md)
+- [ResizeController](classes/ResizeController.md)
+
+## Interfaces
+
+- [AddOptions](interfaces/AddOptions.md)
+- [Availability](interfaces/Availability.md)
+- [AvailabilityConflict](interfaces/AvailabilityConflict.md)
+- [CalendarApi](interfaces/CalendarApi.md)
+- [CalendarCoreOptions](interfaces/CalendarCoreOptions.md)
+- [CalendarStore](interfaces/CalendarStore.md)
+- [CeilOptions](interfaces/CeilOptions.md)
+- [ClampOptions](interfaces/ClampOptions.md)
+- [CountOptions](interfaces/CountOptions.md)
+- [DateCoreOptions](interfaces/DateCoreOptions.md)
+- [DateOptions](interfaces/DateOptions.md)
+- [DateRange](interfaces/DateRange.md)
+- [EndOfOptions](interfaces/EndOfOptions.md)
+- [EqualsOptions](interfaces/EqualsOptions.md)
+- [Event](interfaces/Event.md)
+- [EventDependency](interfaces/EventDependency.md)
+- [EventTimeRange](interfaces/EventTimeRange.md)
+- [FormatDateOptions](interfaces/FormatDateOptions.md)
+- [FormatEventTimeOptions](interfaces/FormatEventTimeOptions.md)
+- [FormattedEventTime](interfaces/FormattedEventTime.md)
+- [FromUnixTimeOptions](interfaces/FromUnixTimeOptions.md)
+- [GetDayOfYearOptions](interfaces/GetDayOfYearOptions.md)
+- [GetUnixTimeOptions](interfaces/GetUnixTimeOptions.md)
+- [GetWeekOptions](interfaces/GetWeekOptions.md)
+- [GhostPreviewOptions](interfaces/GhostPreviewOptions.md)
+- [IntersectsOptions](interfaces/IntersectsOptions.md)
+- [IsAfterOptions](interfaces/IsAfterOptions.md)
+- [IsBeforeOptions](interfaces/IsBeforeOptions.md)
+- [IsBetweenOptions](interfaces/IsBetweenOptions.md)
+- [IsFutureOptions](interfaces/IsFutureOptions.md)
+- [IsLeapYearOptions](interfaces/IsLeapYearOptions.md)
+- [IsPastOptions](interfaces/IsPastOptions.md)
+- [IsSameOrAfterOptions](interfaces/IsSameOrAfterOptions.md)
+- [IsSameOrBeforeOptions](interfaces/IsSameOrBeforeOptions.md)
+- [IsWeekendOptions](interfaces/IsWeekendOptions.md)
+- [MaxOptions](interfaces/MaxOptions.md)
+- [MinOptions](interfaces/MinOptions.md)
+- [ParsedDateCoreOptions](interfaces/ParsedDateCoreOptions.md)
+- [PositionStyle](interfaces/PositionStyle.md)
+- [Range](interfaces/Range.md)
+- [RangeOptions](interfaces/RangeOptions.md)
+- [RecurrenceOverride](interfaces/RecurrenceOverride.md)
+- [RecurrenceRule](interfaces/RecurrenceRule.md)
+- [ResizeConstraints](interfaces/ResizeConstraints.md)
+- [ResizeControllerOptions](interfaces/ResizeControllerOptions.md)
+- [ResizeError](interfaces/ResizeError.md)
+- [ResizeHandleStyle](interfaces/ResizeHandleStyle.md)
+- [ResizePreviewOptions](interfaces/ResizePreviewOptions.md)
+- [ResizeStartArgs](interfaces/ResizeStartArgs.md)
+- [ResizeState](interfaces/ResizeState.md)
+- [ResizeValidationResult](interfaces/ResizeValidationResult.md)
+- [Resource](interfaces/Resource.md)
+- [RoundOptions](interfaces/RoundOptions.md)
+- [SegmentInfo](interfaces/SegmentInfo.md)
+- [SegmentResizePreview](interfaces/SegmentResizePreview.md)
+- [SetFields](interfaces/SetFields.md)
+- [SetOptions](interfaces/SetOptions.md)
+- [SinceOptions](interfaces/SinceOptions.md)
+- [StartOfOptions](interfaces/StartOfOptions.md)
+- [SubtractOptions](interfaces/SubtractOptions.md)
+- [TimeEventInfo](interfaces/TimeEventInfo.md)
+- [TimeEventMap](interfaces/TimeEventMap.md)
+- [TimelineEventLayout](interfaces/TimelineEventLayout.md)
+- [TimelineLayout](interfaces/TimelineLayout.md)
+- [TimelineResizePreviewOptions](interfaces/TimelineResizePreviewOptions.md)
+- [TimelineResizePreviewStyle](interfaces/TimelineResizePreviewStyle.md)
+- [TimelineResourceRow](interfaces/TimelineResourceRow.md)
+- [TimeSlot](interfaces/TimeSlot.md)
+- [UnavailabilityReason](interfaces/UnavailabilityReason.md)
+- [UnavailableRange](interfaces/UnavailableRange.md)
+- [UnavailableTimeRange](interfaces/UnavailableTimeRange.md)
+- [UntilOptions](interfaces/UntilOptions.md)
+- [ValidateResizeOptions](interfaces/ValidateResizeOptions.md)
+- [ValidateResizeResult](interfaces/ValidateResizeResult.md)
+- [ViewMode](interfaces/ViewMode.md)
+
+## Type Aliases
+
+- [CeilUnit](type-aliases/CeilUnit.md)
+- [CountUnit](type-aliases/CountUnit.md)
+- [DateInput](type-aliases/DateInput.md)
+- [Day](type-aliases/Day.md)
+- [DependencyType](type-aliases/DependencyType.md)
+- [DurationLike](type-aliases/DurationLike.md)
+- [EndOfUnit](type-aliases/EndOfUnit.md)
+- [EqualsUnit](type-aliases/EqualsUnit.md)
+- [EventDateTimeInput](type-aliases/EventDateTimeInput.md)
+- [FormatType](type-aliases/FormatType.md)
+- [GroupDaysByProps](type-aliases/GroupDaysByProps.md)
+- [IsSameOrAfterUnit](type-aliases/IsSameOrAfterUnit.md)
+- [IsSameOrBeforeUnit](type-aliases/IsSameOrBeforeUnit.md)
+- [RecurrenceEditScope](type-aliases/RecurrenceEditScope.md)
+- [RecurrenceFrequency](type-aliases/RecurrenceFrequency.md)
+- [ResizeEdge](type-aliases/ResizeEdge.md)
+- [ResizeListener](type-aliases/ResizeListener.md)
+- [RoundUnit](type-aliases/RoundUnit.md)
+- [SaveEventResult](type-aliases/SaveEventResult.md)
+- [StartOfUnit](type-aliases/StartOfUnit.md)
+
+## Functions
+
+- [add](functions/add.md)
+- [calculateDeltaMinutesFromPixels](functions/calculateDeltaMinutesFromPixels.md)
+- [calculateDeltaMinutesFromPixelsHorizontal](functions/calculateDeltaMinutesFromPixelsHorizontal.md)
+- [calculateGhostPreviewStyle](functions/calculateGhostPreviewStyle.md)
+- [calculateResizedEvent](functions/calculateResizedEvent.md)
+- [calculateSegmentResizePreview](functions/calculateSegmentResizePreview.md)
+- [calculateTimelineResizePreview](functions/calculateTimelineResizePreview.md)
+- [ceil](functions/ceil.md)
+- [clamp](functions/clamp.md)
+- [count](functions/count.md)
+- [endOf](functions/endOf.md)
+- [equals](functions/equals.md)
+- [format](functions/format.md)
+- [formatEventTimeRange](functions/formatEventTimeRange.md)
+- [fromUnixTime](functions/fromUnixTime.md)
+- [generateDateRange](functions/generateDateRange.md)
+- [getDayOfYear](functions/getDayOfYear.md)
+- [getEventDisplayTimeRange](functions/getEventDisplayTimeRange.md)
+- [getEventProps](functions/getEventProps.md)
+- [getResizeHandleStyle](functions/getResizeHandleStyle.md)
+- [getSegmentInfo](functions/getSegmentInfo.md)
+- [getTimeClient](functions/getTimeClient.md)
+- [getTimeSlots](functions/getTimeSlots.md)
+- [getUnixTime](functions/getUnixTime.md)
+- [getWeek](functions/getWeek.md)
+- [groupDaysBy](functions/groupDaysBy.md)
+- [intersects](functions/intersects.md)
+- [isAfter](functions/isAfter.md)
+- [isBefore](functions/isBefore.md)
+- [isBetween](functions/isBetween.md)
+- [isFuture](functions/isFuture.md)
+- [isLeapYear](functions/isLeapYear.md)
+- [isMultiDayEvent](functions/isMultiDayEvent.md)
+- [isPast](functions/isPast.md)
+- [isSameOrAfter](functions/isSameOrAfter.md)
+- [isSameOrBefore](functions/isSameOrBefore.md)
+- [isWeekend](functions/isWeekend.md)
+- [max](functions/max.md)
+- [min](functions/min.md)
+- [range](functions/range.md)
+- [round](functions/round.md)
+- [set](functions/set.md)
+- [since](functions/since.md)
+- [splitMultiDayEvents](functions/splitMultiDayEvents.md)
+- [startOf](functions/startOf.md)
+- [subtract](functions/subtract.md)
+- [toDate](functions/toDate.md)
+- [toPlainDateString](functions/toPlainDateString.md)
+- [toPlainDateTimeString](functions/toPlainDateTimeString.md)
+- [toPlainTimeString](functions/toPlainTimeString.md)
+- [until](functions/until.md)
diff --git a/docs/reference/interfaces/AddOptions.md b/docs/reference/interfaces/AddOptions.md
new file mode 100644
index 00000000..250d3345
--- /dev/null
+++ b/docs/reference/interfaces/AddOptions.md
@@ -0,0 +1,70 @@
+---
+id: AddOptions
+title: AddOptions
+---
+
+# Interface: AddOptions
+
+Defined in: [date/add/add.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/add/add.ts#L5)
+
+## Extends
+
+- `DateOperationOptions`
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.calendar
+```
+
+***
+
+### duration
+
+```ts
+duration: DurationLike;
+```
+
+Defined in: [date/add/add.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/add/add.ts#L6)
+
+***
+
+### returnFormat?
+
+```ts
+optional returnFormat: ReturnFormat;
+```
+
+Defined in: [date/withDateOperation/withDateOperation.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/withDateOperation/withDateOperation.ts#L9)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.returnFormat
+```
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.timeZone
+```
diff --git a/docs/reference/interfaces/Availability.md b/docs/reference/interfaces/Availability.md
new file mode 100644
index 00000000..f8870f33
--- /dev/null
+++ b/docs/reference/interfaces/Availability.md
@@ -0,0 +1,44 @@
+---
+id: Availability
+title: Availability
+---
+
+# Interface: Availability
+
+Defined in: [calendar/types.ts:70](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L70)
+
+## Properties
+
+### endTime
+
+```ts
+endTime: string;
+```
+
+Defined in: [calendar/types.ts:76](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L76)
+
+End time in HH:mm format
+
+***
+
+### startTime
+
+```ts
+startTime: string;
+```
+
+Defined in: [calendar/types.ts:74](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L74)
+
+Start time in HH:mm format
+
+***
+
+### weekdays
+
+```ts
+weekdays: number[];
+```
+
+Defined in: [calendar/types.ts:72](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L72)
+
+Days of the week when available (ISO weekday: 1 = Monday, ..., 7 = Sunday)
diff --git a/docs/reference/interfaces/AvailabilityConflict.md b/docs/reference/interfaces/AvailabilityConflict.md
new file mode 100644
index 00000000..0323892d
--- /dev/null
+++ b/docs/reference/interfaces/AvailabilityConflict.md
@@ -0,0 +1,82 @@
+---
+id: AvailabilityConflict
+title: AvailabilityConflict
+---
+
+# Interface: AvailabilityConflict
+
+Defined in: [calendar/types.ts:206](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L206)
+
+Information about a specific availability conflict
+
+## Properties
+
+### conflictRange
+
+```ts
+conflictRange: object;
+```
+
+Defined in: [calendar/types.ts:210](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L210)
+
+Time range that conflicts with availability
+
+#### end
+
+```ts
+end: string;
+```
+
+#### start
+
+```ts
+start: string;
+```
+
+***
+
+### date
+
+```ts
+date: string;
+```
+
+Defined in: [calendar/types.ts:208](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L208)
+
+The date where the conflict occurred (YYYY-MM-DD)
+
+***
+
+### description
+
+```ts
+description: string;
+```
+
+Defined in: [calendar/types.ts:219](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L219)
+
+Human-readable description of the conflict
+
+***
+
+### resourceDetails
+
+```ts
+resourceDetails: UnavailabilityReason[];
+```
+
+Defined in: [calendar/types.ts:217](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L217)
+
+Detailed reasons for each resource
+
+***
+
+### resourceIds
+
+```ts
+resourceIds: string[];
+```
+
+Defined in: [calendar/types.ts:215](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L215)
+
+The resource(s) whose availability is being violated
diff --git a/docs/reference/interfaces/CalendarApi.md b/docs/reference/interfaces/CalendarApi.md
new file mode 100644
index 00000000..f7f4c3d0
--- /dev/null
+++ b/docs/reference/interfaces/CalendarApi.md
@@ -0,0 +1,1402 @@
+---
+id: CalendarApi
+title: CalendarApi
+---
+
+# Interface: CalendarApi\<TResource, TEvent\>
+
+Defined in: [calendar/calendar.ts:283](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L283)
+
+## Extends
+
+- `CalendarActions`\<`TResource`, `TEvent`\>.`ConvertTemporalToString`\<`CalendarState`\<`TResource`, `TEvent`\>\>
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](Event.md)\<`TResource`\>
+
+## Properties
+
+### activeDate
+
+```ts
+activeDate: string;
+```
+
+Defined in: [calendar/calendar.ts:276](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L276)
+
+The currently active date in the calendar.
+
+#### Inherited from
+
+```ts
+ConvertTemporalToString.activeDate
+```
+
+***
+
+### addEvent()
+
+```ts
+addEvent: (event, options?) => Promise<SaveEventResult>;
+```
+
+Defined in: [calendar/calendar.ts:147](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L147)
+
+Fetches events for the event's date range, validates placement
+constraints, and adds the event if valid. Returns a result
+indicating success or a validation error.
+
+#### Parameters
+
+##### event
+
+`TEvent`
+
+##### options?
+
+###### dependsOn?
+
+[`EventDependency`](EventDependency.md)[]
+
+#### Returns
+
+`Promise`\<[`SaveEventResult`](../type-aliases/SaveEventResult.md)\>
+
+#### Inherited from
+
+```ts
+CalendarActions.addEvent
+```
+
+***
+
+### canGoNextPeriod()
+
+```ts
+canGoNextPeriod: () => boolean;
+```
+
+Defined in: [calendar/calendar.ts:93](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L93)
+
+Checks if navigation to the next period is allowed within the range.
+
+#### Returns
+
+`boolean`
+
+#### Inherited from
+
+```ts
+CalendarActions.canGoNextPeriod
+```
+
+***
+
+### canGoPreviousPeriod()
+
+```ts
+canGoPreviousPeriod: () => boolean;
+```
+
+Defined in: [calendar/calendar.ts:91](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L91)
+
+Checks if navigation to the previous period is allowed within the range.
+
+#### Returns
+
+`boolean`
+
+#### Inherited from
+
+```ts
+CalendarActions.canGoPreviousPeriod
+```
+
+***
+
+### canRedo()
+
+```ts
+canRedo: () => boolean;
+```
+
+Defined in: [calendar/calendar.ts:215](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L215)
+
+Returns true when there is at least one action to redo.
+
+#### Returns
+
+`boolean`
+
+#### Inherited from
+
+```ts
+CalendarActions.canRedo
+```
+
+***
+
+### canUndo()
+
+```ts
+canUndo: () => boolean;
+```
+
+Defined in: [calendar/calendar.ts:213](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L213)
+
+Returns true when there is at least one action to undo.
+
+#### Returns
+
+`boolean`
+
+#### Inherited from
+
+```ts
+CalendarActions.canUndo
+```
+
+***
+
+### changeViewMode()
+
+```ts
+changeViewMode: (newViewMode) => void;
+```
+
+Defined in: [calendar/calendar.ts:112](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L112)
+
+Changes the current view mode of the calendar.
+
+#### Parameters
+
+##### newViewMode
+
+[`ViewMode`](ViewMode.md)
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.changeViewMode
+```
+
+***
+
+### createDependency()
+
+```ts
+createDependency: (sourceId, targetId, type?) => object;
+```
+
+Defined in: [calendar/calendar.ts:238](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L238)
+
+Creates a dependency link from source to target event.
+If the target event starts before the source event ends, it will optionally reschedule the target.
+
+#### Parameters
+
+##### sourceId
+
+`string`
+
+##### targetId
+
+`string`
+
+##### type?
+
+[`DependencyType`](../type-aliases/DependencyType.md)
+
+#### Returns
+
+`object`
+
+##### blocked
+
+```ts
+blocked: boolean;
+```
+
+##### error?
+
+```ts
+optional error: ResizeError;
+```
+
+#### Inherited from
+
+```ts
+CalendarActions.createDependency
+```
+
+***
+
+### currentPeriod
+
+```ts
+currentPeriod: string;
+```
+
+Defined in: [calendar/calendar.ts:270](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L270)
+
+The currently focused date period in the calendar.
+
+#### Inherited from
+
+```ts
+ConvertTemporalToString.currentPeriod
+```
+
+***
+
+### days
+
+```ts
+days: Day<TResource, TEvent>[];
+```
+
+Defined in: [calendar/calendar.ts:274](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L274)
+
+An array of days, each potentially containing events.
+
+#### Inherited from
+
+```ts
+ConvertTemporalToString.days
+```
+
+***
+
+### editEvent()
+
+```ts
+editEvent: (eventId, updates, options?) => Promise<SaveEventResult>;
+```
+
+Defined in: [calendar/calendar.ts:156](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L156)
+
+Fetches events for the event's date range, validates move constraints
+(and cascading dependents), and updates the event if valid.
+Returns a result indicating success or a validation error.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### updates
+
+`Partial`\<`Omit`\<`TEvent`, `"id"`\>\>
+
+##### options?
+
+###### dependsOn?
+
+[`EventDependency`](EventDependency.md)[]
+
+#### Returns
+
+`Promise`\<[`SaveEventResult`](../type-aliases/SaveEventResult.md)\>
+
+#### Inherited from
+
+```ts
+CalendarActions.editEvent
+```
+
+***
+
+### editRecurringEvent()
+
+```ts
+editRecurringEvent: (eventId, updates, options) => Promise<SaveEventResult>;
+```
+
+Defined in: [calendar/calendar.ts:162](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L162)
+
+Edits one occurrence, this-and-following occurrences, or the whole recurring series.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### updates
+
+`Partial`\<`Omit`\<`TEvent`, `"id"`\>\>
+
+##### options
+
+###### dependsOn?
+
+[`EventDependency`](EventDependency.md)[]
+
+###### occurrenceStart?
+
+[`EventDateTimeInput`](../type-aliases/EventDateTimeInput.md)
+
+###### scope
+
+[`RecurrenceEditScope`](../type-aliases/RecurrenceEditScope.md)
+
+#### Returns
+
+`Promise`\<[`SaveEventResult`](../type-aliases/SaveEventResult.md)\>
+
+#### Inherited from
+
+```ts
+CalendarActions.editRecurringEvent
+```
+
+***
+
+### fetchEventsForRange()
+
+```ts
+fetchEventsForRange: (start, end) => Promise<void>;
+```
+
+Defined in: [calendar/calendar.ts:249](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L249)
+
+Fetches events for an arbitrary date range from the configured
+`fetchEvents` callback and merges them into the calendar.
+Resolves immediately if `fetchEvents` is not configured or the range
+is already loaded.
+
+#### Parameters
+
+##### start
+
+`string`
+
+##### end
+
+`string`
+
+#### Returns
+
+`Promise`\<`void`\>
+
+#### Inherited from
+
+```ts
+CalendarActions.fetchEventsForRange
+```
+
+***
+
+### formatCurrentPeriod()
+
+```ts
+formatCurrentPeriod: (options?) => string;
+```
+
+Defined in: [calendar/calendar.ts:196](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L196)
+
+Formats the current period as a human-readable "Month Year" string (e.g. "January 2024").
+
+#### Parameters
+
+##### options?
+
+###### locale?
+
+`string`
+
+#### Returns
+
+`string`
+
+#### Inherited from
+
+```ts
+CalendarActions.formatCurrentPeriod
+```
+
+***
+
+### formatPeriodLabel()
+
+```ts
+formatPeriodLabel: (options?) => string;
+```
+
+Defined in: [calendar/calendar.ts:194](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L194)
+
+Returns a human-readable label for the currently visible date range.
+
+#### Parameters
+
+##### options?
+
+###### locale?
+
+`string`
+
+#### Returns
+
+`string`
+
+#### Inherited from
+
+```ts
+CalendarActions.formatPeriodLabel
+```
+
+***
+
+### getAllDayEventsByDate()
+
+```ts
+getAllDayEventsByDate: (date) => TEvent[];
+```
+
+Defined in: [calendar/calendar.ts:141](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L141)
+
+Retrieves all-day events occurring on a specific date (multi-day all-day segments included).
+
+#### Parameters
+
+##### date
+
+`string`
+
+#### Returns
+
+`TEvent`[]
+
+#### Inherited from
+
+```ts
+CalendarActions.getAllDayEventsByDate
+```
+
+***
+
+### getDaysInRange()
+
+```ts
+getDaysInRange: (start, end) => Day<TResource, TEvent>[];
+```
+
+Defined in: [calendar/calendar.ts:205](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L205)
+
+Returns Day objects for every date between `start` and `end` (inclusive),
+derived freshly from current event state. Useful for buffered/infinite-scroll
+UIs that need to render a range wider than the current period without
+caching stale Day snapshots.
+
+#### Parameters
+
+##### start
+
+`string`
+
+##### end
+
+`string`
+
+#### Returns
+
+[`Day`](../type-aliases/Day.md)\<`TResource`, `TEvent`\>[]
+
+#### Inherited from
+
+```ts
+CalendarActions.getDaysInRange
+```
+
+***
+
+### getDaysNames()
+
+```ts
+getDaysNames: (weekday?) => string[];
+```
+
+Defined in: [calendar/calendar.ts:127](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L127)
+
+Retrieves the names of the days of the week, based on the current locale.
+
+#### Parameters
+
+##### weekday?
+
+`"long"` | `"short"`
+
+#### Returns
+
+`string`[]
+
+#### Inherited from
+
+```ts
+CalendarActions.getDaysNames
+```
+
+***
+
+### getEventProps()
+
+```ts
+getEventProps: (event) => object;
+```
+
+Defined in: [calendar/calendar.ts:114](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L114)
+
+Retrieves styling properties for a specific event.
+
+#### Parameters
+
+##### event
+
+`TEvent`
+
+#### Returns
+
+`object`
+
+##### end
+
+```ts
+end: string;
+```
+
+##### isSplitEvent
+
+```ts
+isSplitEvent: boolean;
+```
+
+##### overlappingEvents
+
+```ts
+overlappingEvents: TEvent[];
+```
+
+##### start
+
+```ts
+start: string;
+```
+
+##### style?
+
+```ts
+optional style: object;
+```
+
+###### style.height
+
+```ts
+height: string;
+```
+
+###### style.left
+
+```ts
+left: string;
+```
+
+###### style.top
+
+```ts
+top: string;
+```
+
+###### style.width
+
+```ts
+width: string;
+```
+
+#### Inherited from
+
+```ts
+CalendarActions.getEventProps
+```
+
+***
+
+### getEvents()
+
+```ts
+getEvents: () => TEvent[];
+```
+
+Defined in: [calendar/calendar.ts:207](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L207)
+
+Returns a snapshot of all events currently managed by the calendar (including those outside the visible range).
+
+#### Returns
+
+`TEvent`[]
+
+#### Inherited from
+
+```ts
+CalendarActions.getEvents
+```
+
+***
+
+### getEventsByDate()
+
+```ts
+getEventsByDate: (date) => TEvent[];
+```
+
+Defined in: [calendar/calendar.ts:139](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L139)
+
+Retrieves all events for a specific date.
+
+#### Parameters
+
+##### date
+
+`string`
+
+#### Returns
+
+`TEvent`[]
+
+#### Inherited from
+
+```ts
+CalendarActions.getEventsByDate
+```
+
+***
+
+### getEventsByResource()
+
+```ts
+getEventsByResource: () => Map<TResource["id"], TEvent[]>;
+```
+
+Defined in: [calendar/calendar.ts:190](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L190)
+
+Groups visible events by resource, merging multi-day segments back to full-span events.
+
+#### Returns
+
+`Map`\<`TResource`\[`"id"`\], `TEvent`[]\>
+
+#### Inherited from
+
+```ts
+CalendarActions.getEventsByResource
+```
+
+***
+
+### getEventSegmentInfo()
+
+```ts
+getEventSegmentInfo: (event) => SegmentInfo;
+```
+
+Defined in: [calendar/calendar.ts:198](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L198)
+
+Returns segment info (split/occurrence metadata) for an event, normalising flexible datetime inputs.
+
+#### Parameters
+
+##### event
+
+`TEvent`
+
+#### Returns
+
+[`SegmentInfo`](SegmentInfo.md)
+
+#### Inherited from
+
+```ts
+CalendarActions.getEventSegmentInfo
+```
+
+***
+
+### getMasterEvent()
+
+```ts
+getMasterEvent: (event) => TEvent;
+```
+
+Defined in: [calendar/calendar.ts:110](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L110)
+
+Returns the master event for a given occurrence (or the event itself if it is already the master).
+
+#### Parameters
+
+##### event
+
+`TEvent`
+
+#### Returns
+
+`TEvent`
+
+#### Inherited from
+
+```ts
+CalendarActions.getMasterEvent
+```
+
+***
+
+### getTimelineLayout()
+
+```ts
+getTimelineLayout: () => TimelineLayout<TResource, TEvent>;
+```
+
+Defined in: [calendar/calendar.ts:192](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L192)
+
+Computes horizontal timeline layout with event positions, lane assignments, and current time marker.
+
+#### Returns
+
+[`TimelineLayout`](TimelineLayout.md)\<`TResource`, `TEvent`\>
+
+#### Inherited from
+
+```ts
+CalendarActions.getTimelineLayout
+```
+
+***
+
+### getTimeSlots()
+
+```ts
+getTimeSlots: (options?) => TimeSlot[];
+```
+
+Defined in: [calendar/calendar.ts:135](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L135)
+
+Retrieves time slots for day view with configurable intervals.
+
+#### Parameters
+
+##### options?
+
+`TimeSlotOptions`
+
+#### Returns
+
+[`TimeSlot`](TimeSlot.md)[]
+
+#### Inherited from
+
+```ts
+CalendarActions.getTimeSlots
+```
+
+***
+
+### getUnavailableRanges()
+
+```ts
+getUnavailableRanges: (date, options?) => UnavailableRange[];
+```
+
+Defined in: [calendar/calendar.ts:182](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L182)
+
+Retrieves unavailable time ranges for a specific date based on resource availability.
+
+#### Parameters
+
+##### date
+
+`string`
+
+##### options?
+
+###### containerHeight?
+
+`number`
+
+###### resourceIds?
+
+`TResource`\[`"id"`\][]
+
+#### Returns
+
+[`UnavailableRange`](UnavailableRange.md)[]
+
+#### Inherited from
+
+```ts
+CalendarActions.getUnavailableRanges
+```
+
+***
+
+### goToCurrentPeriod()
+
+```ts
+goToCurrentPeriod: () => void;
+```
+
+Defined in: [calendar/calendar.ts:87](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L87)
+
+Resets the view to the current period based on today's date.
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.goToCurrentPeriod
+```
+
+***
+
+### goToNextOccurrence()
+
+```ts
+goToNextOccurrence: (eventId, fromDate?) => void;
+```
+
+Defined in: [calendar/calendar.ts:98](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L98)
+
+Navigates to the next occurrence of a recurring event after fromDate (defaults to activeDate).
+No-op when the event is not recurring or has no future occurrences.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### fromDate?
+
+[`EventDateTimeInput`](../type-aliases/EventDateTimeInput.md)
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.goToNextOccurrence
+```
+
+***
+
+### goToNextPeriod()
+
+```ts
+goToNextPeriod: () => void;
+```
+
+Defined in: [calendar/calendar.ts:85](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L85)
+
+Navigates to the next period according to the current view mode.
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.goToNextPeriod
+```
+
+***
+
+### goToPreviousOccurrence()
+
+```ts
+goToPreviousOccurrence: (eventId, fromDate?) => void;
+```
+
+Defined in: [calendar/calendar.ts:103](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L103)
+
+Navigates to the previous occurrence of a recurring event before fromDate (defaults to activeDate).
+No-op when the event is not recurring or is already at the first occurrence.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### fromDate?
+
+[`EventDateTimeInput`](../type-aliases/EventDateTimeInput.md)
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.goToPreviousOccurrence
+```
+
+***
+
+### goToPreviousPeriod()
+
+```ts
+goToPreviousPeriod: () => void;
+```
+
+Defined in: [calendar/calendar.ts:83](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L83)
+
+Navigates to the previous period according to the current view mode.
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.goToPreviousPeriod
+```
+
+***
+
+### goToSpecificPeriod()
+
+```ts
+goToSpecificPeriod: (date) => void;
+```
+
+Defined in: [calendar/calendar.ts:89](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L89)
+
+Navigates to a specific date.
+
+#### Parameters
+
+##### date
+
+`string`
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.goToSpecificPeriod
+```
+
+***
+
+### groupDaysBy()
+
+```ts
+groupDaysBy: (props) => (Day<TResource, TEvent> | null)[][];
+```
+
+Defined in: [calendar/calendar.ts:129](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L129)
+
+Groups days by a specified unit.
+
+#### Parameters
+
+##### props
+
+###### days
+
+([`Day`](../type-aliases/Day.md)\<`TResource`, `TEvent`\> \| `null`)[]
+
+###### fillMissingDays?
+
+`boolean`
+
+###### unit
+
+`"week"` \| `"workWeek"`
+
+#### Returns
+
+([`Day`](../type-aliases/Day.md)\<`TResource`, `TEvent`\> \| `null`)[][]
+
+#### Inherited from
+
+```ts
+CalendarActions.groupDaysBy
+```
+
+***
+
+### redo()
+
+```ts
+redo: () => void;
+```
+
+Defined in: [calendar/calendar.ts:211](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L211)
+
+Re-applies the last undone action.
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.redo
+```
+
+***
+
+### removeEvent()
+
+```ts
+removeEvent: (id) => void;
+```
+
+Defined in: [calendar/calendar.ts:180](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L180)
+
+Removes an event by ID.
+
+#### Parameters
+
+##### id
+
+`string`
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.removeEvent
+```
+
+***
+
+### removeRecurringEvent()
+
+```ts
+removeRecurringEvent: (eventId, options) => void;
+```
+
+Defined in: [calendar/calendar.ts:172](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L172)
+
+Removes one occurrence, this-and-following occurrences, or the whole recurring series.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### options
+
+###### occurrenceStart?
+
+[`EventDateTimeInput`](../type-aliases/EventDateTimeInput.md)
+
+###### scope
+
+[`RecurrenceEditScope`](../type-aliases/RecurrenceEditScope.md)
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.removeRecurringEvent
+```
+
+***
+
+### setEvents()
+
+```ts
+setEvents: (events) => void;
+```
+
+Defined in: [calendar/calendar.ts:262](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L262)
+
+#### Parameters
+
+##### events
+
+`TEvent`[] | `null`
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.setEvents
+```
+
+***
+
+### setResources()
+
+```ts
+setResources: (resources) => void;
+```
+
+Defined in: [calendar/calendar.ts:261](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L261)
+
+#### Parameters
+
+##### resources
+
+`TResource`[] | `null`
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.setResources
+```
+
+***
+
+### undo()
+
+```ts
+undo: () => void;
+```
+
+Defined in: [calendar/calendar.ts:209](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L209)
+
+Reverts the last mutating action (commitAdd, commitUpdate, removeEvent).
+
+#### Returns
+
+`void`
+
+#### Inherited from
+
+```ts
+CalendarActions.undo
+```
+
+***
+
+### validateEventDependencies()
+
+```ts
+validateEventDependencies: (event, dependsOn) => object;
+```
+
+Defined in: [calendar/calendar.ts:230](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L230)
+
+Validates if placing an event with a specific start time satisfies all dependency constraints.
+
+#### Parameters
+
+##### event
+
+###### end
+
+`string`
+
+###### id?
+
+`string`
+
+###### start
+
+`string`
+
+###### title
+
+`string`
+
+##### dependsOn
+
+[`EventDependency`](EventDependency.md)[]
+
+#### Returns
+
+`object`
+
+##### error?
+
+```ts
+optional error: ResizeError;
+```
+
+##### valid
+
+```ts
+valid: boolean;
+```
+
+#### Inherited from
+
+```ts
+CalendarActions.validateEventDependencies
+```
+
+***
+
+### validateEventPlacement()
+
+```ts
+validateEventPlacement: (event) => object;
+```
+
+Defined in: [calendar/calendar.ts:255](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L255)
+
+Validates whether a new event (not yet added to the calendar) can be
+placed at the given time slot without violating resource availability.
+Use this for standalone validation before manually committing events.
+
+#### Parameters
+
+##### event
+
+###### end
+
+`string`
+
+###### resources?
+
+(`string` \| `TResource`)[]
+
+###### start
+
+`string`
+
+###### title
+
+`string`
+
+#### Returns
+
+`object`
+
+##### blocked
+
+```ts
+blocked: boolean;
+```
+
+##### message?
+
+```ts
+optional message: string;
+```
+
+#### Inherited from
+
+```ts
+CalendarActions.validateEventPlacement
+```
+
+***
+
+### validateMove()
+
+```ts
+validateMove: (eventId, newStart, newEnd, newResources?, newConsumption?) => object;
+```
+
+Defined in: [calendar/calendar.ts:220](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L220)
+
+Checks whether moving `eventId` to `[newStart, newEnd]` — and cascading
+all finish-to-start dependents — would violate any resource availability.
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### newStart
+
+`string`
+
+##### newEnd
+
+`string`
+
+##### newResources?
+
+(`string` \| `TResource`)[]
+
+##### newConsumption?
+
+`number`[]
+
+#### Returns
+
+`object`
+
+##### blocked
+
+```ts
+blocked: boolean;
+```
+
+##### blockedEventTitle?
+
+```ts
+optional blockedEventTitle: string;
+```
+
+##### message?
+
+```ts
+optional message: string;
+```
+
+#### Inherited from
+
+```ts
+CalendarActions.validateMove
+```
+
+***
+
+### viewMode
+
+```ts
+viewMode: ViewMode;
+```
+
+Defined in: [calendar/calendar.ts:272](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L272)
+
+The current view mode of the calendar.
+
+#### Inherited from
+
+```ts
+ConvertTemporalToString.viewMode
+```
diff --git a/docs/reference/interfaces/CalendarCoreOptions.md b/docs/reference/interfaces/CalendarCoreOptions.md
new file mode 100644
index 00000000..ed139463
--- /dev/null
+++ b/docs/reference/interfaces/CalendarCoreOptions.md
@@ -0,0 +1,210 @@
+---
+id: CalendarCoreOptions
+title: CalendarCoreOptions
+---
+
+# Interface: CalendarCoreOptions\<TResource, TEvent\>
+
+Defined in: [calendar/calendar.ts:53](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L53)
+
+Configuration options for initializing a CalendarCore instance, allowing customization
+of events, locale, time zone, and the calendar system.
+
+## Extends
+
+- [`DateCoreOptions`](DateCoreOptions.md)
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](Event.md)\<`TResource`\>
+
+Specifies the event type, extending a base Event type.
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: CalendarLike;
+```
+
+Defined in: [calendar/date-core.ts:60](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L60)
+
+Optional calendar system to be used.
+
+#### Inherited from
+
+[`DateCoreOptions`](DateCoreOptions.md).[`calendar`](DateCoreOptions.md#calendar)
+
+***
+
+### dateFormatter?
+
+```ts
+optional dateFormatter: DateTimeFormat;
+```
+
+Defined in: [calendar/date-core.ts:64](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L64)
+
+Optional date formatter.
+
+#### Inherited from
+
+[`DateCoreOptions`](DateCoreOptions.md).[`dateFormatter`](DateCoreOptions.md#dateformatter)
+
+***
+
+### dateTimeFormatter?
+
+```ts
+optional dateTimeFormatter: DateTimeFormat;
+```
+
+Defined in: [calendar/date-core.ts:68](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L68)
+
+Optional date time formatter.
+
+#### Inherited from
+
+[`DateCoreOptions`](DateCoreOptions.md).[`dateTimeFormatter`](DateCoreOptions.md#datetimeformatter)
+
+***
+
+### events?
+
+```ts
+optional events: TEvent[] | null;
+```
+
+Defined in: [calendar/calendar.ts:58](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L58)
+
+An optional array of events to be handled by the calendar.
+
+***
+
+### fetchEvents()?
+
+```ts
+optional fetchEvents: (range) => Promise<TEvent[]>;
+```
+
+Defined in: [calendar/calendar.ts:67](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L67)
+
+Optional async callback for lazy/on-demand event loading.
+Called whenever the current viewport window is not yet fully loaded.
+The returned events are merged into the internal indices automatically.
+When omitted the calendar operates in fully-eager mode (no change in behaviour).
+
+#### Parameters
+
+##### range
+
+###### end
+
+`string`
+
+###### start
+
+`string`
+
+#### Returns
+
+`Promise`\<`TEvent`[]\>
+
+***
+
+### locale?
+
+```ts
+optional locale: string;
+```
+
+Defined in: [calendar/date-core.ts:56](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L56)
+
+Optional locale for date formatting. Uses a BCP 47 language tag.
+
+#### Inherited from
+
+[`DateCoreOptions`](DateCoreOptions.md).[`locale`](DateCoreOptions.md#locale)
+
+***
+
+### range?
+
+```ts
+optional range: DateRange;
+```
+
+Defined in: [calendar/date-core.ts:62](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L62)
+
+Optional range of dates to be used.
+
+#### Inherited from
+
+[`DateCoreOptions`](DateCoreOptions.md).[`range`](DateCoreOptions.md#range)
+
+***
+
+### resources?
+
+```ts
+optional resources: TResource[] | null;
+```
+
+Defined in: [calendar/calendar.ts:60](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L60)
+
+Optional resources to be used in the calendar.
+
+***
+
+### timeFormatter?
+
+```ts
+optional timeFormatter: DateTimeFormat;
+```
+
+Defined in: [calendar/date-core.ts:66](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L66)
+
+Optional time formatter.
+
+#### Inherited from
+
+[`DateCoreOptions`](DateCoreOptions.md).[`timeFormatter`](DateCoreOptions.md#timeformatter)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: TimeZoneLike;
+```
+
+Defined in: [calendar/date-core.ts:58](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L58)
+
+Optional time zone specification.
+
+#### Inherited from
+
+[`DateCoreOptions`](DateCoreOptions.md).[`timeZone`](DateCoreOptions.md#timezone)
+
+***
+
+### viewMode
+
+```ts
+viewMode: ViewMode;
+```
+
+Defined in: [calendar/date-core.ts:54](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L54)
+
+The initial view mode configuration.
+
+#### Inherited from
+
+[`DateCoreOptions`](DateCoreOptions.md).[`viewMode`](DateCoreOptions.md#viewmode)
diff --git a/docs/reference/interfaces/CalendarStore.md b/docs/reference/interfaces/CalendarStore.md
new file mode 100644
index 00000000..23baa023
--- /dev/null
+++ b/docs/reference/interfaces/CalendarStore.md
@@ -0,0 +1,60 @@
+---
+id: CalendarStore
+title: CalendarStore
+---
+
+# Interface: CalendarStore
+
+Defined in: [calendar/types.ts:174](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L174)
+
+## Properties
+
+### activeDate
+
+```ts
+activeDate: PlainDate;
+```
+
+Defined in: [calendar/types.ts:176](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L176)
+
+***
+
+### currentPeriod
+
+```ts
+currentPeriod: PlainDate;
+```
+
+Defined in: [calendar/types.ts:175](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L175)
+
+***
+
+### eventsVersion
+
+```ts
+eventsVersion: number;
+```
+
+Defined in: [calendar/types.ts:178](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L178)
+
+***
+
+### isPending
+
+```ts
+isPending: boolean;
+```
+
+Defined in: [calendar/types.ts:180](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L180)
+
+True while an async fetchEvents call is in-flight for the current viewport.
+
+***
+
+### viewMode
+
+```ts
+viewMode: ViewMode;
+```
+
+Defined in: [calendar/types.ts:177](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L177)
diff --git a/docs/reference/interfaces/CeilOptions.md b/docs/reference/interfaces/CeilOptions.md
new file mode 100644
index 00000000..c37d41aa
--- /dev/null
+++ b/docs/reference/interfaces/CeilOptions.md
@@ -0,0 +1,70 @@
+---
+id: CeilOptions
+title: CeilOptions
+---
+
+# Interface: CeilOptions
+
+Defined in: [date/ceil/ceil.ts:14](https://github.com/TanStack/time/blob/main/packages/time/src/date/ceil/ceil.ts#L14)
+
+## Extends
+
+- `DateOperationOptions`
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.calendar
+```
+
+***
+
+### returnFormat?
+
+```ts
+optional returnFormat: ReturnFormat;
+```
+
+Defined in: [date/withDateOperation/withDateOperation.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/withDateOperation/withDateOperation.ts#L9)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.returnFormat
+```
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.timeZone
+```
+
+***
+
+### unit
+
+```ts
+unit: CeilUnit;
+```
+
+Defined in: [date/ceil/ceil.ts:15](https://github.com/TanStack/time/blob/main/packages/time/src/date/ceil/ceil.ts#L15)
diff --git a/docs/reference/interfaces/ClampOptions.md b/docs/reference/interfaces/ClampOptions.md
new file mode 100644
index 00000000..72e7b86e
--- /dev/null
+++ b/docs/reference/interfaces/ClampOptions.md
@@ -0,0 +1,50 @@
+---
+id: ClampOptions
+title: ClampOptions
+---
+
+# Interface: ClampOptions
+
+Defined in: [date/clamp/clamp.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/clamp/clamp.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### range
+
+```ts
+range: Range;
+```
+
+Defined in: [date/clamp/clamp.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/clamp/clamp.ts#L7)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/CountOptions.md b/docs/reference/interfaces/CountOptions.md
new file mode 100644
index 00000000..8e8aa244
--- /dev/null
+++ b/docs/reference/interfaces/CountOptions.md
@@ -0,0 +1,50 @@
+---
+id: CountOptions
+title: CountOptions
+---
+
+# Interface: CountOptions
+
+Defined in: [date/count/count.ts:15](https://github.com/TanStack/time/blob/main/packages/time/src/date/count/count.ts#L15)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
+
+***
+
+### unit
+
+```ts
+unit: CountUnit;
+```
+
+Defined in: [date/count/count.ts:16](https://github.com/TanStack/time/blob/main/packages/time/src/date/count/count.ts#L16)
diff --git a/docs/reference/interfaces/DateCoreOptions.md b/docs/reference/interfaces/DateCoreOptions.md
new file mode 100644
index 00000000..267fd3e3
--- /dev/null
+++ b/docs/reference/interfaces/DateCoreOptions.md
@@ -0,0 +1,110 @@
+---
+id: DateCoreOptions
+title: DateCoreOptions
+---
+
+# Interface: DateCoreOptions
+
+Defined in: [calendar/date-core.ts:52](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L52)
+
+Base options interface for date-related core classes.
+
+## Extended by
+
+- [`CalendarCoreOptions`](CalendarCoreOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: CalendarLike;
+```
+
+Defined in: [calendar/date-core.ts:60](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L60)
+
+Optional calendar system to be used.
+
+***
+
+### dateFormatter?
+
+```ts
+optional dateFormatter: DateTimeFormat;
+```
+
+Defined in: [calendar/date-core.ts:64](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L64)
+
+Optional date formatter.
+
+***
+
+### dateTimeFormatter?
+
+```ts
+optional dateTimeFormatter: DateTimeFormat;
+```
+
+Defined in: [calendar/date-core.ts:68](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L68)
+
+Optional date time formatter.
+
+***
+
+### locale?
+
+```ts
+optional locale: string;
+```
+
+Defined in: [calendar/date-core.ts:56](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L56)
+
+Optional locale for date formatting. Uses a BCP 47 language tag.
+
+***
+
+### range?
+
+```ts
+optional range: DateRange;
+```
+
+Defined in: [calendar/date-core.ts:62](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L62)
+
+Optional range of dates to be used.
+
+***
+
+### timeFormatter?
+
+```ts
+optional timeFormatter: DateTimeFormat;
+```
+
+Defined in: [calendar/date-core.ts:66](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L66)
+
+Optional time formatter.
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: TimeZoneLike;
+```
+
+Defined in: [calendar/date-core.ts:58](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L58)
+
+Optional time zone specification.
+
+***
+
+### viewMode
+
+```ts
+viewMode: ViewMode;
+```
+
+Defined in: [calendar/date-core.ts:54](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L54)
+
+The initial view mode configuration.
diff --git a/docs/reference/interfaces/DateOptions.md b/docs/reference/interfaces/DateOptions.md
new file mode 100644
index 00000000..663e6438
--- /dev/null
+++ b/docs/reference/interfaces/DateOptions.md
@@ -0,0 +1,53 @@
+---
+id: DateOptions
+title: DateOptions
+---
+
+# Interface: DateOptions
+
+Defined in: [date/types.ts:10](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L10)
+
+## Extended by
+
+- [`SinceOptions`](SinceOptions.md)
+- [`UntilOptions`](UntilOptions.md)
+- [`EqualsOptions`](EqualsOptions.md)
+- [`IsLeapYearOptions`](IsLeapYearOptions.md)
+- [`IsWeekendOptions`](IsWeekendOptions.md)
+- [`ClampOptions`](ClampOptions.md)
+- [`CountOptions`](CountOptions.md)
+- [`MinOptions`](MinOptions.md)
+- [`MaxOptions`](MaxOptions.md)
+- [`IsPastOptions`](IsPastOptions.md)
+- [`IsFutureOptions`](IsFutureOptions.md)
+- [`FromUnixTimeOptions`](FromUnixTimeOptions.md)
+- [`GetUnixTimeOptions`](GetUnixTimeOptions.md)
+- [`GetDayOfYearOptions`](GetDayOfYearOptions.md)
+- [`GetWeekOptions`](GetWeekOptions.md)
+- [`IsBeforeOptions`](IsBeforeOptions.md)
+- [`IsAfterOptions`](IsAfterOptions.md)
+- [`IsSameOrBeforeOptions`](IsSameOrBeforeOptions.md)
+- [`IsSameOrAfterOptions`](IsSameOrAfterOptions.md)
+- [`IsBetweenOptions`](IsBetweenOptions.md)
+- [`IntersectsOptions`](IntersectsOptions.md)
+- [`FormatDateOptions`](FormatDateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
diff --git a/docs/reference/interfaces/DateRange.md b/docs/reference/interfaces/DateRange.md
new file mode 100644
index 00000000..b62917bc
--- /dev/null
+++ b/docs/reference/interfaces/DateRange.md
@@ -0,0 +1,28 @@
+---
+id: DateRange
+title: DateRange
+---
+
+# Interface: DateRange
+
+Defined in: [calendar/types.ts:152](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L152)
+
+## Properties
+
+### end
+
+```ts
+end: DateInput | null;
+```
+
+Defined in: [calendar/types.ts:154](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L154)
+
+***
+
+### start
+
+```ts
+start: DateInput | null;
+```
+
+Defined in: [calendar/types.ts:153](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L153)
diff --git a/docs/reference/interfaces/EndOfOptions.md b/docs/reference/interfaces/EndOfOptions.md
new file mode 100644
index 00000000..7f3c282c
--- /dev/null
+++ b/docs/reference/interfaces/EndOfOptions.md
@@ -0,0 +1,70 @@
+---
+id: EndOfOptions
+title: EndOfOptions
+---
+
+# Interface: EndOfOptions
+
+Defined in: [date/endOf/endOf.ts:15](https://github.com/TanStack/time/blob/main/packages/time/src/date/endOf/endOf.ts#L15)
+
+## Extends
+
+- `DateOperationOptions`
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.calendar
+```
+
+***
+
+### returnFormat?
+
+```ts
+optional returnFormat: ReturnFormat;
+```
+
+Defined in: [date/withDateOperation/withDateOperation.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/withDateOperation/withDateOperation.ts#L9)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.returnFormat
+```
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.timeZone
+```
+
+***
+
+### unit
+
+```ts
+unit: EndOfUnit;
+```
+
+Defined in: [date/endOf/endOf.ts:16](https://github.com/TanStack/time/blob/main/packages/time/src/date/endOf/endOf.ts#L16)
diff --git a/docs/reference/interfaces/EqualsOptions.md b/docs/reference/interfaces/EqualsOptions.md
new file mode 100644
index 00000000..530e281b
--- /dev/null
+++ b/docs/reference/interfaces/EqualsOptions.md
@@ -0,0 +1,40 @@
+---
+id: EqualsOptions
+title: EqualsOptions
+---
+
+# Interface: EqualsOptions
+
+Defined in: [date/equals/equals.ts:16](https://github.com/TanStack/time/blob/main/packages/time/src/date/equals/equals.ts#L16)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/Event.md b/docs/reference/interfaces/Event.md
new file mode 100644
index 00000000..0933da7a
--- /dev/null
+++ b/docs/reference/interfaces/Event.md
@@ -0,0 +1,177 @@
+---
+id: Event
+title: Event
+---
+
+# Interface: Event\<TResource\>
+
+Defined in: [calendar/types.ts:101](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L101)
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](Resource.md) = [`Resource`](Resource.md)
+
+## Properties
+
+### \_occurrenceIndex?
+
+```ts
+optional _occurrenceIndex: number;
+```
+
+Defined in: [calendar/types.ts:132](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L132)
+
+0-based index of this occurrence within the recurring series.
+
+***
+
+### \_occurrenceOriginalStart?
+
+```ts
+optional _occurrenceOriginalStart: string;
+```
+
+Defined in: [calendar/types.ts:134](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L134)
+
+Original occurrence start before EXDATE/override changes.
+
+***
+
+### \_originalEnd?
+
+```ts
+optional _originalEnd: string;
+```
+
+Defined in: [calendar/types.ts:125](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L125)
+
+Original end time before splitting (only set on split segments of multi-day events)
+
+***
+
+### \_originalStart?
+
+```ts
+optional _originalStart: string;
+```
+
+Defined in: [calendar/types.ts:123](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L123)
+
+Original start time before splitting (only set on split segments of multi-day events)
+
+***
+
+### \_recurringMasterId?
+
+```ts
+optional _recurringMasterId: string;
+```
+
+Defined in: [calendar/types.ts:130](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L130)
+
+ID of the master recurring event this occurrence was generated from.
+Only present on ephemeral occurrence instances (index > 0).
+
+***
+
+### allDay?
+
+```ts
+optional allDay: boolean;
+```
+
+Defined in: [calendar/types.ts:121](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L121)
+
+When true, event spans full day(s) and is rendered in the all-day strip
+separately from timed events. `start` and `end` are still ISO datetime strings;
+for an all-day event use the day's start (00:00:00) and the inclusive day's
+end (23:59:59) — or any time within those days. Multi-day all-day events
+are split per-day like regular events.
+
+***
+
+### consumption?
+
+```ts
+optional consumption: number[];
+```
+
+Defined in: [calendar/types.ts:107](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L107)
+
+***
+
+### dependsOn?
+
+```ts
+optional dependsOn: EventDependency[];
+```
+
+Defined in: [calendar/types.ts:111](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L111)
+
+Dependency links to other events this event is constrained by.
+Each link has an `id` (predecessor event) and a `type` (FS/SS/FF/SF).
+When a predecessor's relevant anchor shifts, this event shifts by the same delta.
+
+***
+
+### end
+
+```ts
+end: EventDateTimeInput;
+```
+
+Defined in: [calendar/types.ts:104](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L104)
+
+***
+
+### id
+
+```ts
+id: string;
+```
+
+Defined in: [calendar/types.ts:102](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L102)
+
+***
+
+### recurrence?
+
+```ts
+optional recurrence: RecurrenceRule<TResource>;
+```
+
+Defined in: [calendar/types.ts:113](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L113)
+
+Defines how and when this event repeats.
+
+***
+
+### resources?
+
+```ts
+optional resources: (string | TResource)[];
+```
+
+Defined in: [calendar/types.ts:106](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L106)
+
+***
+
+### start
+
+```ts
+start: EventDateTimeInput;
+```
+
+Defined in: [calendar/types.ts:103](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L103)
+
+***
+
+### title
+
+```ts
+title: string;
+```
+
+Defined in: [calendar/types.ts:105](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L105)
diff --git a/docs/reference/interfaces/EventDependency.md b/docs/reference/interfaces/EventDependency.md
new file mode 100644
index 00000000..b85574f1
--- /dev/null
+++ b/docs/reference/interfaces/EventDependency.md
@@ -0,0 +1,30 @@
+---
+id: EventDependency
+title: EventDependency
+---
+
+# Interface: EventDependency
+
+Defined in: [calendar/types.ts:13](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L13)
+
+A single dependency from one event to another.
+
+## Properties
+
+### id
+
+```ts
+id: string;
+```
+
+Defined in: [calendar/types.ts:14](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L14)
+
+***
+
+### type
+
+```ts
+type: DependencyType;
+```
+
+Defined in: [calendar/types.ts:15](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L15)
diff --git a/docs/reference/interfaces/EventTimeRange.md b/docs/reference/interfaces/EventTimeRange.md
new file mode 100644
index 00000000..1f0354da
--- /dev/null
+++ b/docs/reference/interfaces/EventTimeRange.md
@@ -0,0 +1,38 @@
+---
+id: EventTimeRange
+title: EventTimeRange
+---
+
+# Interface: EventTimeRange
+
+Defined in: [calendar/getResizeProps.ts:504](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L504)
+
+## Properties
+
+### end
+
+```ts
+end: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:506](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L506)
+
+***
+
+### isMultiDay
+
+```ts
+isMultiDay: boolean;
+```
+
+Defined in: [calendar/getResizeProps.ts:507](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L507)
+
+***
+
+### start
+
+```ts
+start: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:505](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L505)
diff --git a/docs/reference/interfaces/FormatDateOptions.md b/docs/reference/interfaces/FormatDateOptions.md
new file mode 100644
index 00000000..cb4727cd
--- /dev/null
+++ b/docs/reference/interfaces/FormatDateOptions.md
@@ -0,0 +1,74 @@
+---
+id: FormatDateOptions
+title: FormatDateOptions
+---
+
+# Interface: FormatDateOptions
+
+Defined in: [date/format/format.ts:16](https://github.com/TanStack/time/blob/main/packages/time/src/date/format/format.ts#L16)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### locale?
+
+```ts
+optional locale: string | string[] | Locale | Locale[];
+```
+
+Defined in: [date/format/format.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/date/format/format.ts#L18)
+
+***
+
+### options?
+
+```ts
+optional options: 
+  | string
+  | DateFormatterOptions
+  | TimeFormatterOptions
+  | DateTimeFormatterOptions;
+```
+
+Defined in: [date/format/format.ts:19](https://github.com/TanStack/time/blob/main/packages/time/src/date/format/format.ts#L19)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
+
+***
+
+### type?
+
+```ts
+optional type: FormatType;
+```
+
+Defined in: [date/format/format.ts:17](https://github.com/TanStack/time/blob/main/packages/time/src/date/format/format.ts#L17)
diff --git a/docs/reference/interfaces/FormatEventTimeOptions.md b/docs/reference/interfaces/FormatEventTimeOptions.md
new file mode 100644
index 00000000..779f7ff8
--- /dev/null
+++ b/docs/reference/interfaces/FormatEventTimeOptions.md
@@ -0,0 +1,32 @@
+---
+id: FormatEventTimeOptions
+title: FormatEventTimeOptions
+---
+
+# Interface: FormatEventTimeOptions
+
+Defined in: [calendar/getResizeProps.ts:539](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L539)
+
+## Properties
+
+### alwaysShowDate?
+
+```ts
+optional alwaysShowDate: boolean;
+```
+
+Defined in: [calendar/getResizeProps.ts:543](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L543)
+
+Whether to include date for single-day events
+
+***
+
+### locale?
+
+```ts
+optional locale: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:541](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L541)
+
+Locale for formatting (e.g., 'en-US')
diff --git a/docs/reference/interfaces/FormattedEventTime.md b/docs/reference/interfaces/FormattedEventTime.md
new file mode 100644
index 00000000..b28aac93
--- /dev/null
+++ b/docs/reference/interfaces/FormattedEventTime.md
@@ -0,0 +1,56 @@
+---
+id: FormattedEventTime
+title: FormattedEventTime
+---
+
+# Interface: FormattedEventTime
+
+Defined in: [calendar/getResizeProps.ts:546](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L546)
+
+## Properties
+
+### endFormatted
+
+```ts
+endFormatted: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:550](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L550)
+
+Formatted end string
+
+***
+
+### isMultiDay
+
+```ts
+isMultiDay: boolean;
+```
+
+Defined in: [calendar/getResizeProps.ts:554](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L554)
+
+Whether this is a multi-day event
+
+***
+
+### rangeFormatted
+
+```ts
+rangeFormatted: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:552](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L552)
+
+Full formatted range string
+
+***
+
+### startFormatted
+
+```ts
+startFormatted: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:548](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L548)
+
+Formatted start string
diff --git a/docs/reference/interfaces/FromUnixTimeOptions.md b/docs/reference/interfaces/FromUnixTimeOptions.md
new file mode 100644
index 00000000..13184e10
--- /dev/null
+++ b/docs/reference/interfaces/FromUnixTimeOptions.md
@@ -0,0 +1,40 @@
+---
+id: FromUnixTimeOptions
+title: FromUnixTimeOptions
+---
+
+# Interface: FromUnixTimeOptions
+
+Defined in: [date/fromUnixTime/fromUnixTime.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/fromUnixTime/fromUnixTime.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/GetDayOfYearOptions.md b/docs/reference/interfaces/GetDayOfYearOptions.md
new file mode 100644
index 00000000..57c3c561
--- /dev/null
+++ b/docs/reference/interfaces/GetDayOfYearOptions.md
@@ -0,0 +1,40 @@
+---
+id: GetDayOfYearOptions
+title: GetDayOfYearOptions
+---
+
+# Interface: GetDayOfYearOptions
+
+Defined in: [date/getDayOfYear/getDayOfYear.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/getDayOfYear/getDayOfYear.ts#L5)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/GetUnixTimeOptions.md b/docs/reference/interfaces/GetUnixTimeOptions.md
new file mode 100644
index 00000000..874b433b
--- /dev/null
+++ b/docs/reference/interfaces/GetUnixTimeOptions.md
@@ -0,0 +1,40 @@
+---
+id: GetUnixTimeOptions
+title: GetUnixTimeOptions
+---
+
+# Interface: GetUnixTimeOptions
+
+Defined in: [date/getUnixTime/getUnixTime.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/getUnixTime/getUnixTime.ts#L5)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/GetWeekOptions.md b/docs/reference/interfaces/GetWeekOptions.md
new file mode 100644
index 00000000..fa1d9bdc
--- /dev/null
+++ b/docs/reference/interfaces/GetWeekOptions.md
@@ -0,0 +1,40 @@
+---
+id: GetWeekOptions
+title: GetWeekOptions
+---
+
+# Interface: GetWeekOptions
+
+Defined in: [date/getWeek/getWeek.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/getWeek/getWeek.ts#L5)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/GhostPreviewOptions.md b/docs/reference/interfaces/GhostPreviewOptions.md
new file mode 100644
index 00000000..5e859e96
--- /dev/null
+++ b/docs/reference/interfaces/GhostPreviewOptions.md
@@ -0,0 +1,44 @@
+---
+id: GhostPreviewOptions
+title: GhostPreviewOptions
+---
+
+# Interface: GhostPreviewOptions
+
+Defined in: [calendar/getResizeProps.ts:369](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L369)
+
+## Properties
+
+### dayDate
+
+```ts
+dayDate: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:371](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L371)
+
+The date string of the day being rendered (YYYY-MM-DD)
+
+***
+
+### previewEnd
+
+```ts
+previewEnd: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:375](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L375)
+
+The preview end during resize
+
+***
+
+### previewStart
+
+```ts
+previewStart: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:373](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L373)
+
+The preview start during resize
diff --git a/docs/reference/interfaces/IntersectsOptions.md b/docs/reference/interfaces/IntersectsOptions.md
new file mode 100644
index 00000000..431b4865
--- /dev/null
+++ b/docs/reference/interfaces/IntersectsOptions.md
@@ -0,0 +1,50 @@
+---
+id: IntersectsOptions
+title: IntersectsOptions
+---
+
+# Interface: IntersectsOptions
+
+Defined in: [date/intersects/intersects.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/intersects/intersects.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### range
+
+```ts
+range: Range;
+```
+
+Defined in: [date/intersects/intersects.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/intersects/intersects.ts#L7)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/IsAfterOptions.md b/docs/reference/interfaces/IsAfterOptions.md
new file mode 100644
index 00000000..fb772548
--- /dev/null
+++ b/docs/reference/interfaces/IsAfterOptions.md
@@ -0,0 +1,40 @@
+---
+id: IsAfterOptions
+title: IsAfterOptions
+---
+
+# Interface: IsAfterOptions
+
+Defined in: [date/isAfter/isAfter.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/isAfter/isAfter.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/IsBeforeOptions.md b/docs/reference/interfaces/IsBeforeOptions.md
new file mode 100644
index 00000000..3c06573c
--- /dev/null
+++ b/docs/reference/interfaces/IsBeforeOptions.md
@@ -0,0 +1,40 @@
+---
+id: IsBeforeOptions
+title: IsBeforeOptions
+---
+
+# Interface: IsBeforeOptions
+
+Defined in: [date/isBefore/isBefore.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/isBefore/isBefore.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/IsBetweenOptions.md b/docs/reference/interfaces/IsBetweenOptions.md
new file mode 100644
index 00000000..48e5ca62
--- /dev/null
+++ b/docs/reference/interfaces/IsBetweenOptions.md
@@ -0,0 +1,60 @@
+---
+id: IsBetweenOptions
+title: IsBetweenOptions
+---
+
+# Interface: IsBetweenOptions
+
+Defined in: [date/isBetween/isBetween.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/isBetween/isBetween.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### inclusive?
+
+```ts
+optional inclusive: boolean | "start" | "end";
+```
+
+Defined in: [date/isBetween/isBetween.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/isBetween/isBetween.ts#L7)
+
+***
+
+### range
+
+```ts
+range: Range;
+```
+
+Defined in: [date/isBetween/isBetween.ts:8](https://github.com/TanStack/time/blob/main/packages/time/src/date/isBetween/isBetween.ts#L8)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/IsFutureOptions.md b/docs/reference/interfaces/IsFutureOptions.md
new file mode 100644
index 00000000..d777d20d
--- /dev/null
+++ b/docs/reference/interfaces/IsFutureOptions.md
@@ -0,0 +1,40 @@
+---
+id: IsFutureOptions
+title: IsFutureOptions
+---
+
+# Interface: IsFutureOptions
+
+Defined in: [date/isFuture/isFuture.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/isFuture/isFuture.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/IsLeapYearOptions.md b/docs/reference/interfaces/IsLeapYearOptions.md
new file mode 100644
index 00000000..dcdcc9f2
--- /dev/null
+++ b/docs/reference/interfaces/IsLeapYearOptions.md
@@ -0,0 +1,40 @@
+---
+id: IsLeapYearOptions
+title: IsLeapYearOptions
+---
+
+# Interface: IsLeapYearOptions
+
+Defined in: [date/isLeapYear/isLeapYear.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/isLeapYear/isLeapYear.ts#L5)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/IsPastOptions.md b/docs/reference/interfaces/IsPastOptions.md
new file mode 100644
index 00000000..a1ca5159
--- /dev/null
+++ b/docs/reference/interfaces/IsPastOptions.md
@@ -0,0 +1,40 @@
+---
+id: IsPastOptions
+title: IsPastOptions
+---
+
+# Interface: IsPastOptions
+
+Defined in: [date/isPast/isPast.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/isPast/isPast.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/IsSameOrAfterOptions.md b/docs/reference/interfaces/IsSameOrAfterOptions.md
new file mode 100644
index 00000000..92f0e03c
--- /dev/null
+++ b/docs/reference/interfaces/IsSameOrAfterOptions.md
@@ -0,0 +1,50 @@
+---
+id: IsSameOrAfterOptions
+title: IsSameOrAfterOptions
+---
+
+# Interface: IsSameOrAfterOptions
+
+Defined in: [date/isSameOrAfter/isSameOrAfter.ts:17](https://github.com/TanStack/time/blob/main/packages/time/src/date/isSameOrAfter/isSameOrAfter.ts#L17)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
+
+***
+
+### unit
+
+```ts
+unit: IsSameOrAfterUnit;
+```
+
+Defined in: [date/isSameOrAfter/isSameOrAfter.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/date/isSameOrAfter/isSameOrAfter.ts#L18)
diff --git a/docs/reference/interfaces/IsSameOrBeforeOptions.md b/docs/reference/interfaces/IsSameOrBeforeOptions.md
new file mode 100644
index 00000000..e818e578
--- /dev/null
+++ b/docs/reference/interfaces/IsSameOrBeforeOptions.md
@@ -0,0 +1,50 @@
+---
+id: IsSameOrBeforeOptions
+title: IsSameOrBeforeOptions
+---
+
+# Interface: IsSameOrBeforeOptions
+
+Defined in: [date/isSameOrBefore/isSameOrBefore.ts:17](https://github.com/TanStack/time/blob/main/packages/time/src/date/isSameOrBefore/isSameOrBefore.ts#L17)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
+
+***
+
+### unit
+
+```ts
+unit: IsSameOrBeforeUnit;
+```
+
+Defined in: [date/isSameOrBefore/isSameOrBefore.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/date/isSameOrBefore/isSameOrBefore.ts#L18)
diff --git a/docs/reference/interfaces/IsWeekendOptions.md b/docs/reference/interfaces/IsWeekendOptions.md
new file mode 100644
index 00000000..f1bc1c23
--- /dev/null
+++ b/docs/reference/interfaces/IsWeekendOptions.md
@@ -0,0 +1,50 @@
+---
+id: IsWeekendOptions
+title: IsWeekendOptions
+---
+
+# Interface: IsWeekendOptions
+
+Defined in: [date/isWeekend/isWeekend.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/isWeekend/isWeekend.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### locale?
+
+```ts
+optional locale: string;
+```
+
+Defined in: [date/isWeekend/isWeekend.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/isWeekend/isWeekend.ts#L7)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/MaxOptions.md b/docs/reference/interfaces/MaxOptions.md
new file mode 100644
index 00000000..5aa64cec
--- /dev/null
+++ b/docs/reference/interfaces/MaxOptions.md
@@ -0,0 +1,40 @@
+---
+id: MaxOptions
+title: MaxOptions
+---
+
+# Interface: MaxOptions
+
+Defined in: [date/max/max.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/max/max.ts#L7)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/MinOptions.md b/docs/reference/interfaces/MinOptions.md
new file mode 100644
index 00000000..f234d2b1
--- /dev/null
+++ b/docs/reference/interfaces/MinOptions.md
@@ -0,0 +1,40 @@
+---
+id: MinOptions
+title: MinOptions
+---
+
+# Interface: MinOptions
+
+Defined in: [date/min/min.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/min/min.ts#L7)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
diff --git a/docs/reference/interfaces/ParsedDateCoreOptions.md b/docs/reference/interfaces/ParsedDateCoreOptions.md
new file mode 100644
index 00000000..5e694cf3
--- /dev/null
+++ b/docs/reference/interfaces/ParsedDateCoreOptions.md
@@ -0,0 +1,86 @@
+---
+id: ParsedDateCoreOptions
+title: ParsedDateCoreOptions
+---
+
+# Interface: ParsedDateCoreOptions
+
+Defined in: [calendar/date-core.ts:71](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L71)
+
+## Extends
+
+- `Omit`\<`Required`\<[`DateCoreOptions`](DateCoreOptions.md)\>, `"range"` \| `"dateFormatter"` \| `"timeFormatter"` \| `"dateTimeFormatter"`\>
+
+## Properties
+
+### calendar
+
+```ts
+calendar: CalendarLike;
+```
+
+Defined in: [calendar/date-core.ts:60](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L60)
+
+Optional calendar system to be used.
+
+#### Inherited from
+
+[`CalendarCoreOptions`](CalendarCoreOptions.md).[`calendar`](CalendarCoreOptions.md#calendar)
+
+***
+
+### locale
+
+```ts
+locale: string;
+```
+
+Defined in: [calendar/date-core.ts:56](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L56)
+
+Optional locale for date formatting. Uses a BCP 47 language tag.
+
+#### Inherited from
+
+[`CalendarCoreOptions`](CalendarCoreOptions.md).[`locale`](CalendarCoreOptions.md#locale)
+
+***
+
+### range
+
+```ts
+range: ParsedDateRange;
+```
+
+Defined in: [calendar/date-core.ts:75](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L75)
+
+***
+
+### timeZone
+
+```ts
+timeZone: TimeZoneLike;
+```
+
+Defined in: [calendar/date-core.ts:58](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L58)
+
+Optional time zone specification.
+
+#### Inherited from
+
+[`CalendarCoreOptions`](CalendarCoreOptions.md).[`timeZone`](CalendarCoreOptions.md#timezone)
+
+***
+
+### viewMode
+
+```ts
+viewMode: ViewMode;
+```
+
+Defined in: [calendar/date-core.ts:54](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/date-core.ts#L54)
+
+The initial view mode configuration.
+
+#### Inherited from
+
+[`CalendarCoreOptions`](CalendarCoreOptions.md).[`viewMode`](CalendarCoreOptions.md#viewmode)
diff --git a/docs/reference/interfaces/PositionStyle.md b/docs/reference/interfaces/PositionStyle.md
new file mode 100644
index 00000000..3c2700fb
--- /dev/null
+++ b/docs/reference/interfaces/PositionStyle.md
@@ -0,0 +1,30 @@
+---
+id: PositionStyle
+title: PositionStyle
+---
+
+# Interface: PositionStyle
+
+Defined in: [calendar/getResizeProps.ts:266](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L266)
+
+Style for positioned elements (events, ghosts)
+
+## Properties
+
+### height
+
+```ts
+height: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:268](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L268)
+
+***
+
+### top
+
+```ts
+top: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:267](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L267)
diff --git a/docs/reference/interfaces/Range.md b/docs/reference/interfaces/Range.md
new file mode 100644
index 00000000..47d83f53
--- /dev/null
+++ b/docs/reference/interfaces/Range.md
@@ -0,0 +1,28 @@
+---
+id: Range
+title: Range
+---
+
+# Interface: Range
+
+Defined in: [date/types.ts:17](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L17)
+
+## Properties
+
+### end
+
+```ts
+end: DateInput;
+```
+
+Defined in: [date/types.ts:19](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L19)
+
+***
+
+### start
+
+```ts
+start: DateInput;
+```
+
+Defined in: [date/types.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L18)
diff --git a/docs/reference/interfaces/RangeOptions.md b/docs/reference/interfaces/RangeOptions.md
new file mode 100644
index 00000000..86eaaf67
--- /dev/null
+++ b/docs/reference/interfaces/RangeOptions.md
@@ -0,0 +1,90 @@
+---
+id: RangeOptions
+title: RangeOptions
+---
+
+# Interface: RangeOptions
+
+Defined in: [date/range/range.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/range/range.ts#L7)
+
+## Extends
+
+- `DateOperationOptions`
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.calendar
+```
+
+***
+
+### end
+
+```ts
+end: DateInput;
+```
+
+Defined in: [date/range/range.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/range/range.ts#L9)
+
+***
+
+### returnFormat?
+
+```ts
+optional returnFormat: ReturnFormat;
+```
+
+Defined in: [date/withDateOperation/withDateOperation.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/withDateOperation/withDateOperation.ts#L9)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.returnFormat
+```
+
+***
+
+### start
+
+```ts
+start: DateInput;
+```
+
+Defined in: [date/range/range.ts:8](https://github.com/TanStack/time/blob/main/packages/time/src/date/range/range.ts#L8)
+
+***
+
+### step
+
+```ts
+step: DurationLike;
+```
+
+Defined in: [date/range/range.ts:10](https://github.com/TanStack/time/blob/main/packages/time/src/date/range/range.ts#L10)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.timeZone
+```
diff --git a/docs/reference/interfaces/RecurrenceOverride.md b/docs/reference/interfaces/RecurrenceOverride.md
new file mode 100644
index 00000000..be7fa4eb
--- /dev/null
+++ b/docs/reference/interfaces/RecurrenceOverride.md
@@ -0,0 +1,116 @@
+---
+id: RecurrenceOverride
+title: RecurrenceOverride
+---
+
+# Interface: RecurrenceOverride\<TResource\>
+
+Defined in: [calendar/types.ts:22](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L22)
+
+Single-occurrence replacement keyed by the original occurrence start.
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](Resource.md) = [`Resource`](Resource.md)
+
+## Indexable
+
+```ts
+[key: string]: unknown
+```
+
+## Properties
+
+### allDay?
+
+```ts
+optional allDay: boolean;
+```
+
+Defined in: [calendar/types.ts:33](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L33)
+
+***
+
+### consumption?
+
+```ts
+optional consumption: number[];
+```
+
+Defined in: [calendar/types.ts:31](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L31)
+
+***
+
+### dependsOn?
+
+```ts
+optional dependsOn: EventDependency[];
+```
+
+Defined in: [calendar/types.ts:32](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L32)
+
+***
+
+### end?
+
+```ts
+optional end: EventDateTimeInput;
+```
+
+Defined in: [calendar/types.ts:28](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L28)
+
+***
+
+### id?
+
+```ts
+optional id: string;
+```
+
+Defined in: [calendar/types.ts:26](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L26)
+
+Optional replacement occurrence id. Defaults to the generated occurrence id.
+
+***
+
+### originalStart
+
+```ts
+originalStart: EventDateTimeInput;
+```
+
+Defined in: [calendar/types.ts:24](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L24)
+
+Original occurrence start (RECURRENCE-ID equivalent).
+
+***
+
+### resources?
+
+```ts
+optional resources: (string | TResource)[];
+```
+
+Defined in: [calendar/types.ts:30](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L30)
+
+***
+
+### start?
+
+```ts
+optional start: EventDateTimeInput;
+```
+
+Defined in: [calendar/types.ts:27](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L27)
+
+***
+
+### title?
+
+```ts
+optional title: string;
+```
+
+Defined in: [calendar/types.ts:29](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L29)
diff --git a/docs/reference/interfaces/RecurrenceRule.md b/docs/reference/interfaces/RecurrenceRule.md
new file mode 100644
index 00000000..2bd20b68
--- /dev/null
+++ b/docs/reference/interfaces/RecurrenceRule.md
@@ -0,0 +1,105 @@
+---
+id: RecurrenceRule
+title: RecurrenceRule
+---
+
+# Interface: RecurrenceRule\<TResource\>
+
+Defined in: [calendar/types.ts:41](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L41)
+
+Defines the repetition rule for a recurring event.
+Occurrences are expanded automatically by the calendar within the current viewport.
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](Resource.md) = [`Resource`](Resource.md)
+
+## Properties
+
+### byWeekday?
+
+```ts
+optional byWeekday: number[];
+```
+
+Defined in: [calendar/types.ts:63](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L63)
+
+For `weekly` frequency: ISO weekdays (1 = Mon … 7 = Sun) to repeat on.
+Defaults to the weekday of the original event start.
+
+***
+
+### count?
+
+```ts
+optional count: number;
+```
+
+Defined in: [calendar/types.ts:58](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L58)
+
+Maximum total occurrences to generate (including the original).
+Only used when `until` is not set.
+
+***
+
+### exDates?
+
+```ts
+optional exDates: EventDateTimeInput[];
+```
+
+Defined in: [calendar/types.ts:65](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L65)
+
+Specific occurrence starts to exclude (EXDATE). Date-only values match by occurrence date.
+
+***
+
+### frequency
+
+```ts
+frequency: RecurrenceFrequency;
+```
+
+Defined in: [calendar/types.ts:43](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L43)
+
+How often the event repeats.
+
+***
+
+### interval?
+
+```ts
+optional interval: number;
+```
+
+Defined in: [calendar/types.ts:48](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L48)
+
+Repeat every N frequencies (default 1).
+E.g. `{ frequency: 'weekly', interval: 2 }` = every other week.
+
+***
+
+### overrides?
+
+```ts
+optional overrides: RecurrenceOverride<TResource>[];
+```
+
+Defined in: [calendar/types.ts:67](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L67)
+
+Per-occurrence replacements keyed by original occurrence start.
+
+***
+
+### until?
+
+```ts
+optional until: string;
+```
+
+Defined in: [calendar/types.ts:53](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L53)
+
+ISO date string (YYYY-MM-DD) — no occurrences start on or after this date.
+Takes precedence over `count`.
diff --git a/docs/reference/interfaces/ResizeConstraints.md b/docs/reference/interfaces/ResizeConstraints.md
new file mode 100644
index 00000000..7da83e72
--- /dev/null
+++ b/docs/reference/interfaces/ResizeConstraints.md
@@ -0,0 +1,40 @@
+---
+id: ResizeConstraints
+title: ResizeConstraints
+---
+
+# Interface: ResizeConstraints
+
+Defined in: [calendar/getResizeProps.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L12)
+
+## Properties
+
+### minDurationMinutes?
+
+```ts
+optional minDurationMinutes: number;
+```
+
+Defined in: [calendar/getResizeProps.ts:13](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L13)
+
+***
+
+### snapToMinutes?
+
+```ts
+optional snapToMinutes: number;
+```
+
+Defined in: [calendar/getResizeProps.ts:14](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L14)
+
+***
+
+### unavailableRanges?
+
+```ts
+optional unavailableRanges: UnavailableTimeRange[];
+```
+
+Defined in: [calendar/getResizeProps.ts:16](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L16)
+
+Unavailable time ranges that the event cannot be resized into
diff --git a/docs/reference/interfaces/ResizeControllerOptions.md b/docs/reference/interfaces/ResizeControllerOptions.md
new file mode 100644
index 00000000..90392d1d
--- /dev/null
+++ b/docs/reference/interfaces/ResizeControllerOptions.md
@@ -0,0 +1,172 @@
+---
+id: ResizeControllerOptions
+title: ResizeControllerOptions
+---
+
+# Interface: ResizeControllerOptions
+
+Defined in: [calendar/resizeController.ts:28](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L28)
+
+## Properties
+
+### constraints?
+
+```ts
+optional constraints: ResizeConstraints;
+```
+
+Defined in: [calendar/resizeController.ts:33](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L33)
+
+***
+
+### containerHeight?
+
+```ts
+optional containerHeight: number;
+```
+
+Defined in: [calendar/resizeController.ts:30](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L30)
+
+***
+
+### containerWidth?
+
+```ts
+optional containerWidth: number;
+```
+
+Defined in: [calendar/resizeController.ts:31](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L31)
+
+***
+
+### enabled?
+
+```ts
+optional enabled: boolean;
+```
+
+Defined in: [calendar/resizeController.ts:29](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L29)
+
+***
+
+### onRecurringResizeEnd()?
+
+```ts
+optional onRecurringResizeEnd: (resize) => void;
+```
+
+Defined in: [calendar/resizeController.ts:36](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L36)
+
+#### Parameters
+
+##### resize
+
+###### eventId
+
+`string`
+
+###### newEnd
+
+`string`
+
+###### newStart
+
+`string`
+
+###### occurrenceStart
+
+[`EventDateTimeInput`](../type-aliases/EventDateTimeInput.md)
+
+###### originalEnd
+
+`string`
+
+###### originalStart
+
+`string`
+
+#### Returns
+
+`void`
+
+***
+
+### onResizeEnd()?
+
+```ts
+optional onResizeEnd: (eventId, newStart, newEnd) => void;
+```
+
+Defined in: [calendar/resizeController.ts:35](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L35)
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### newStart
+
+`string`
+
+##### newEnd
+
+`string`
+
+#### Returns
+
+`void`
+
+***
+
+### onResizeError()?
+
+```ts
+optional onResizeError: (error) => void;
+```
+
+Defined in: [calendar/resizeController.ts:44](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L44)
+
+#### Parameters
+
+##### error
+
+[`ResizeError`](ResizeError.md)
+
+#### Returns
+
+`void`
+
+***
+
+### onResizeStart()?
+
+```ts
+optional onResizeStart: (eventId, edge) => void;
+```
+
+Defined in: [calendar/resizeController.ts:34](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L34)
+
+#### Parameters
+
+##### eventId
+
+`string`
+
+##### edge
+
+[`ResizeEdge`](../type-aliases/ResizeEdge.md)
+
+#### Returns
+
+`void`
+
+***
+
+### orientation?
+
+```ts
+optional orientation: "vertical" | "horizontal";
+```
+
+Defined in: [calendar/resizeController.ts:32](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L32)
diff --git a/docs/reference/interfaces/ResizeError.md b/docs/reference/interfaces/ResizeError.md
new file mode 100644
index 00000000..28463014
--- /dev/null
+++ b/docs/reference/interfaces/ResizeError.md
@@ -0,0 +1,102 @@
+---
+id: ResizeError
+title: ResizeError
+---
+
+# Interface: ResizeError
+
+Defined in: [calendar/types.ts:225](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L225)
+
+Error information when a resize operation is blocked
+
+## Properties
+
+### attemptedEnd?
+
+```ts
+optional attemptedEnd: string;
+```
+
+Defined in: [calendar/types.ts:233](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L233)
+
+***
+
+### attemptedStart?
+
+```ts
+optional attemptedStart: string;
+```
+
+Defined in: [calendar/types.ts:232](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L232)
+
+***
+
+### conflicts?
+
+```ts
+optional conflicts: AvailabilityConflict[];
+```
+
+Defined in: [calendar/types.ts:235](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L235)
+
+Specific availability conflicts that prevented the resize
+
+***
+
+### eventId
+
+```ts
+eventId: string;
+```
+
+Defined in: [calendar/types.ts:226](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L226)
+
+***
+
+### eventTitle
+
+```ts
+eventTitle: string;
+```
+
+Defined in: [calendar/types.ts:227](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L227)
+
+***
+
+### message
+
+```ts
+message: string;
+```
+
+Defined in: [calendar/types.ts:229](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L229)
+
+***
+
+### originalEnd
+
+```ts
+originalEnd: string;
+```
+
+Defined in: [calendar/types.ts:231](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L231)
+
+***
+
+### originalStart
+
+```ts
+originalStart: string;
+```
+
+Defined in: [calendar/types.ts:230](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L230)
+
+***
+
+### reason
+
+```ts
+reason: "unavailable-time" | "invalid-time" | "min-duration" | "blocked";
+```
+
+Defined in: [calendar/types.ts:228](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L228)
diff --git a/docs/reference/interfaces/ResizeHandleStyle.md b/docs/reference/interfaces/ResizeHandleStyle.md
new file mode 100644
index 00000000..b661ad1d
--- /dev/null
+++ b/docs/reference/interfaces/ResizeHandleStyle.md
@@ -0,0 +1,88 @@
+---
+id: ResizeHandleStyle
+title: ResizeHandleStyle
+---
+
+# Interface: ResizeHandleStyle
+
+Defined in: [calendar/getResizeProps.ts:183](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L183)
+
+## Properties
+
+### bottom?
+
+```ts
+optional bottom: number;
+```
+
+Defined in: [calendar/getResizeProps.ts:191](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L191)
+
+***
+
+### cursor
+
+```ts
+cursor: "ns-resize";
+```
+
+Defined in: [calendar/getResizeProps.ts:188](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L188)
+
+***
+
+### height
+
+```ts
+height: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:187](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L187)
+
+***
+
+### left
+
+```ts
+left: number;
+```
+
+Defined in: [calendar/getResizeProps.ts:185](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L185)
+
+***
+
+### position
+
+```ts
+position: "absolute";
+```
+
+Defined in: [calendar/getResizeProps.ts:184](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L184)
+
+***
+
+### right
+
+```ts
+right: number;
+```
+
+Defined in: [calendar/getResizeProps.ts:186](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L186)
+
+***
+
+### top?
+
+```ts
+optional top: number;
+```
+
+Defined in: [calendar/getResizeProps.ts:190](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L190)
+
+***
+
+### zIndex
+
+```ts
+zIndex: number;
+```
+
+Defined in: [calendar/getResizeProps.ts:189](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L189)
diff --git a/docs/reference/interfaces/ResizePreviewOptions.md b/docs/reference/interfaces/ResizePreviewOptions.md
new file mode 100644
index 00000000..758a6dc4
--- /dev/null
+++ b/docs/reference/interfaces/ResizePreviewOptions.md
@@ -0,0 +1,68 @@
+---
+id: ResizePreviewOptions
+title: ResizePreviewOptions
+---
+
+# Interface: ResizePreviewOptions
+
+Defined in: [calendar/getResizeProps.ts:283](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L283)
+
+## Properties
+
+### dayDate
+
+```ts
+dayDate: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:285](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L285)
+
+The date string of the day being rendered (YYYY-MM-DD)
+
+***
+
+### originalEnd
+
+```ts
+originalEnd: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:289](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L289)
+
+The original end of the event (before resize)
+
+***
+
+### originalStart
+
+```ts
+originalStart: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:287](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L287)
+
+The original start of the event (before resize)
+
+***
+
+### previewEnd
+
+```ts
+previewEnd: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:293](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L293)
+
+The preview end during resize
+
+***
+
+### previewStart
+
+```ts
+previewStart: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:291](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L291)
+
+The preview start during resize
diff --git a/docs/reference/interfaces/ResizeStartArgs.md b/docs/reference/interfaces/ResizeStartArgs.md
new file mode 100644
index 00000000..d503dd25
--- /dev/null
+++ b/docs/reference/interfaces/ResizeStartArgs.md
@@ -0,0 +1,101 @@
+---
+id: ResizeStartArgs
+title: ResizeStartArgs
+---
+
+# Interface: ResizeStartArgs
+
+Defined in: [calendar/resizeController.ts:47](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L47)
+
+## Properties
+
+### clientX
+
+```ts
+clientX: number;
+```
+
+Defined in: [calendar/resizeController.ts:54](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L54)
+
+***
+
+### clientY
+
+```ts
+clientY: number;
+```
+
+Defined in: [calendar/resizeController.ts:55](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L55)
+
+***
+
+### edge
+
+```ts
+edge: ResizeEdge;
+```
+
+Defined in: [calendar/resizeController.ts:49](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L49)
+
+***
+
+### eventId
+
+```ts
+eventId: string;
+```
+
+Defined in: [calendar/resizeController.ts:48](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L48)
+
+***
+
+### occurrenceStart?
+
+```ts
+optional occurrenceStart: EventDateTimeInput;
+```
+
+Defined in: [calendar/resizeController.ts:52](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L52)
+
+***
+
+### originalEnd
+
+```ts
+originalEnd: string;
+```
+
+Defined in: [calendar/resizeController.ts:51](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L51)
+
+***
+
+### originalStart
+
+```ts
+originalStart: string;
+```
+
+Defined in: [calendar/resizeController.ts:50](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L50)
+
+***
+
+### recurrenceScope?
+
+```ts
+optional recurrenceScope: RecurrenceEditScope;
+```
+
+Defined in: [calendar/resizeController.ts:53](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L53)
+
+***
+
+### target?
+
+```ts
+optional target: HTMLElement | null;
+```
+
+Defined in: [calendar/resizeController.ts:60](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L60)
+
+Optional element under the pointer (e.g. `e.target as HTMLElement`).
+Used to resolve the originating day column without `getBoundingClientRect`.
diff --git a/docs/reference/interfaces/ResizeState.md b/docs/reference/interfaces/ResizeState.md
new file mode 100644
index 00000000..c0cb40ef
--- /dev/null
+++ b/docs/reference/interfaces/ResizeState.md
@@ -0,0 +1,98 @@
+---
+id: ResizeState
+title: ResizeState
+---
+
+# Interface: ResizeState
+
+Defined in: [calendar/resizeController.ts:16](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L16)
+
+## Properties
+
+### blocked
+
+```ts
+blocked: boolean;
+```
+
+Defined in: [calendar/resizeController.ts:25](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L25)
+
+***
+
+### edge
+
+```ts
+edge: ResizeEdge | null;
+```
+
+Defined in: [calendar/resizeController.ts:19](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L19)
+
+***
+
+### eventId
+
+```ts
+eventId: string | null;
+```
+
+Defined in: [calendar/resizeController.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L18)
+
+***
+
+### isResizing
+
+```ts
+isResizing: boolean;
+```
+
+Defined in: [calendar/resizeController.ts:17](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L17)
+
+***
+
+### lastValidPreviewEnd
+
+```ts
+lastValidPreviewEnd: string | null;
+```
+
+Defined in: [calendar/resizeController.ts:23](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L23)
+
+***
+
+### lastValidPreviewStart
+
+```ts
+lastValidPreviewStart: string | null;
+```
+
+Defined in: [calendar/resizeController.ts:22](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L22)
+
+***
+
+### previewEnd
+
+```ts
+previewEnd: string | null;
+```
+
+Defined in: [calendar/resizeController.ts:21](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L21)
+
+***
+
+### previewStart
+
+```ts
+previewStart: string | null;
+```
+
+Defined in: [calendar/resizeController.ts:20](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L20)
+
+***
+
+### targetDayDate
+
+```ts
+targetDayDate: string | null;
+```
+
+Defined in: [calendar/resizeController.ts:24](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L24)
diff --git a/docs/reference/interfaces/ResizeValidationResult.md b/docs/reference/interfaces/ResizeValidationResult.md
new file mode 100644
index 00000000..aa7a8cf4
--- /dev/null
+++ b/docs/reference/interfaces/ResizeValidationResult.md
@@ -0,0 +1,30 @@
+---
+id: ResizeValidationResult
+title: ResizeValidationResult
+---
+
+# Interface: ResizeValidationResult
+
+Defined in: [calendar/types.ts:241](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L241)
+
+Result of checking if a resize is valid
+
+## Properties
+
+### error?
+
+```ts
+optional error: ResizeError;
+```
+
+Defined in: [calendar/types.ts:243](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L243)
+
+***
+
+### valid
+
+```ts
+valid: boolean;
+```
+
+Defined in: [calendar/types.ts:242](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L242)
diff --git a/docs/reference/interfaces/Resource.md b/docs/reference/interfaces/Resource.md
new file mode 100644
index 00000000..71d87bea
--- /dev/null
+++ b/docs/reference/interfaces/Resource.md
@@ -0,0 +1,70 @@
+---
+id: Resource
+title: Resource
+---
+
+# Interface: Resource
+
+Defined in: [calendar/types.ts:79](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L79)
+
+## Properties
+
+### availability?
+
+```ts
+optional availability: Availability[];
+```
+
+Defined in: [calendar/types.ts:82](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L82)
+
+***
+
+### buffer?
+
+```ts
+optional buffer: object;
+```
+
+Defined in: [calendar/types.ts:84](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L84)
+
+#### after?
+
+```ts
+optional after: number;
+```
+
+#### before?
+
+```ts
+optional before: number;
+```
+
+***
+
+### capacity?
+
+```ts
+optional capacity: number[];
+```
+
+Defined in: [calendar/types.ts:83](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L83)
+
+***
+
+### id
+
+```ts
+id: string;
+```
+
+Defined in: [calendar/types.ts:80](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L80)
+
+***
+
+### label
+
+```ts
+label: string;
+```
+
+Defined in: [calendar/types.ts:81](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L81)
diff --git a/docs/reference/interfaces/RoundOptions.md b/docs/reference/interfaces/RoundOptions.md
new file mode 100644
index 00000000..005206c6
--- /dev/null
+++ b/docs/reference/interfaces/RoundOptions.md
@@ -0,0 +1,90 @@
+---
+id: RoundOptions
+title: RoundOptions
+---
+
+# Interface: RoundOptions
+
+Defined in: [date/round/round.ts:17](https://github.com/TanStack/time/blob/main/packages/time/src/date/round/round.ts#L17)
+
+## Extends
+
+- `DateOperationOptions`
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.calendar
+```
+
+***
+
+### returnFormat?
+
+```ts
+optional returnFormat: ReturnFormat;
+```
+
+Defined in: [date/withDateOperation/withDateOperation.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/withDateOperation/withDateOperation.ts#L9)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.returnFormat
+```
+
+***
+
+### roundingIncrement?
+
+```ts
+optional roundingIncrement: number;
+```
+
+Defined in: [date/round/round.ts:20](https://github.com/TanStack/time/blob/main/packages/time/src/date/round/round.ts#L20)
+
+***
+
+### roundingMode?
+
+```ts
+optional roundingMode: RoundingMode;
+```
+
+Defined in: [date/round/round.ts:19](https://github.com/TanStack/time/blob/main/packages/time/src/date/round/round.ts#L19)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.timeZone
+```
+
+***
+
+### unit
+
+```ts
+unit: RoundUnit;
+```
+
+Defined in: [date/round/round.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/date/round/round.ts#L18)
diff --git a/docs/reference/interfaces/SegmentInfo.md b/docs/reference/interfaces/SegmentInfo.md
new file mode 100644
index 00000000..7d9a138b
--- /dev/null
+++ b/docs/reference/interfaces/SegmentInfo.md
@@ -0,0 +1,94 @@
+---
+id: SegmentInfo
+title: SegmentInfo
+---
+
+# Interface: SegmentInfo
+
+Defined in: [calendar/getResizeProps.ts:213](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L213)
+
+Information about a segment's position within a multi-day event
+
+## Properties
+
+### isFirstSegment
+
+```ts
+isFirstSegment: boolean;
+```
+
+Defined in: [calendar/getResizeProps.ts:215](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L215)
+
+Whether this is the first segment of a multi-day event
+
+***
+
+### isLastSegment
+
+```ts
+isLastSegment: boolean;
+```
+
+Defined in: [calendar/getResizeProps.ts:217](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L217)
+
+Whether this is the last segment of a multi-day event
+
+***
+
+### isSplitEvent
+
+```ts
+isSplitEvent: boolean;
+```
+
+Defined in: [calendar/getResizeProps.ts:219](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L219)
+
+Whether this segment is part of a split multi-day event
+
+***
+
+### originalEnd
+
+```ts
+originalEnd: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:223](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L223)
+
+The original event end (before splitting)
+
+***
+
+### originalStart
+
+```ts
+originalStart: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:221](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L221)
+
+The original event start (before splitting)
+
+***
+
+### segmentEnd
+
+```ts
+segmentEnd: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:227](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L227)
+
+The segment's end time
+
+***
+
+### segmentStart
+
+```ts
+segmentStart: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:225](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L225)
+
+The segment's start time
diff --git a/docs/reference/interfaces/SegmentResizePreview.md b/docs/reference/interfaces/SegmentResizePreview.md
new file mode 100644
index 00000000..0d9faebd
--- /dev/null
+++ b/docs/reference/interfaces/SegmentResizePreview.md
@@ -0,0 +1,46 @@
+---
+id: SegmentResizePreview
+title: SegmentResizePreview
+---
+
+# Interface: SegmentResizePreview
+
+Defined in: [calendar/getResizeProps.ts:274](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L274)
+
+Result of resize preview calculation for a segment
+
+## Properties
+
+### hasChanged
+
+```ts
+hasChanged: boolean;
+```
+
+Defined in: [calendar/getResizeProps.ts:280](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L280)
+
+Whether the preview has changed from the original
+
+***
+
+### previewStyle
+
+```ts
+previewStyle: PositionStyle | null;
+```
+
+Defined in: [calendar/getResizeProps.ts:278](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L278)
+
+The preview style to apply, if any
+
+***
+
+### shouldHide
+
+```ts
+shouldHide: boolean;
+```
+
+Defined in: [calendar/getResizeProps.ts:276](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L276)
+
+Whether the segment should be hidden (shrunk away)
diff --git a/docs/reference/interfaces/SetFields.md b/docs/reference/interfaces/SetFields.md
new file mode 100644
index 00000000..a76d4a11
--- /dev/null
+++ b/docs/reference/interfaces/SetFields.md
@@ -0,0 +1,98 @@
+---
+id: SetFields
+title: SetFields
+---
+
+# Interface: SetFields
+
+Defined in: [date/set/set.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L5)
+
+## Properties
+
+### day?
+
+```ts
+optional day: number;
+```
+
+Defined in: [date/set/set.ts:8](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L8)
+
+***
+
+### hour?
+
+```ts
+optional hour: number;
+```
+
+Defined in: [date/set/set.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L9)
+
+***
+
+### microsecond?
+
+```ts
+optional microsecond: number;
+```
+
+Defined in: [date/set/set.ts:13](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L13)
+
+***
+
+### millisecond?
+
+```ts
+optional millisecond: number;
+```
+
+Defined in: [date/set/set.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L12)
+
+***
+
+### minute?
+
+```ts
+optional minute: number;
+```
+
+Defined in: [date/set/set.ts:10](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L10)
+
+***
+
+### month?
+
+```ts
+optional month: number;
+```
+
+Defined in: [date/set/set.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L7)
+
+***
+
+### nanosecond?
+
+```ts
+optional nanosecond: number;
+```
+
+Defined in: [date/set/set.ts:14](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L14)
+
+***
+
+### second?
+
+```ts
+optional second: number;
+```
+
+Defined in: [date/set/set.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L11)
+
+***
+
+### year?
+
+```ts
+optional year: number;
+```
+
+Defined in: [date/set/set.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L6)
diff --git a/docs/reference/interfaces/SetOptions.md b/docs/reference/interfaces/SetOptions.md
new file mode 100644
index 00000000..4d15cbb8
--- /dev/null
+++ b/docs/reference/interfaces/SetOptions.md
@@ -0,0 +1,70 @@
+---
+id: SetOptions
+title: SetOptions
+---
+
+# Interface: SetOptions
+
+Defined in: [date/set/set.ts:17](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L17)
+
+## Extends
+
+- `DateOperationOptions`
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.calendar
+```
+
+***
+
+### fields
+
+```ts
+fields: SetFields;
+```
+
+Defined in: [date/set/set.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/date/set/set.ts#L18)
+
+***
+
+### returnFormat?
+
+```ts
+optional returnFormat: ReturnFormat;
+```
+
+Defined in: [date/withDateOperation/withDateOperation.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/withDateOperation/withDateOperation.ts#L9)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.returnFormat
+```
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.timeZone
+```
diff --git a/docs/reference/interfaces/SinceOptions.md b/docs/reference/interfaces/SinceOptions.md
new file mode 100644
index 00000000..1d186d23
--- /dev/null
+++ b/docs/reference/interfaces/SinceOptions.md
@@ -0,0 +1,50 @@
+---
+id: SinceOptions
+title: SinceOptions
+---
+
+# Interface: SinceOptions
+
+Defined in: [date/since/since.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/since/since.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
+
+***
+
+### unit
+
+```ts
+unit: DateTimeUnit;
+```
+
+Defined in: [date/since/since.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/since/since.ts#L7)
diff --git a/docs/reference/interfaces/StartOfOptions.md b/docs/reference/interfaces/StartOfOptions.md
new file mode 100644
index 00000000..ad444e38
--- /dev/null
+++ b/docs/reference/interfaces/StartOfOptions.md
@@ -0,0 +1,70 @@
+---
+id: StartOfOptions
+title: StartOfOptions
+---
+
+# Interface: StartOfOptions
+
+Defined in: [date/startOf/startOf.ts:15](https://github.com/TanStack/time/blob/main/packages/time/src/date/startOf/startOf.ts#L15)
+
+## Extends
+
+- `DateOperationOptions`
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.calendar
+```
+
+***
+
+### returnFormat?
+
+```ts
+optional returnFormat: ReturnFormat;
+```
+
+Defined in: [date/withDateOperation/withDateOperation.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/withDateOperation/withDateOperation.ts#L9)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.returnFormat
+```
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.timeZone
+```
+
+***
+
+### unit
+
+```ts
+unit: StartOfUnit;
+```
+
+Defined in: [date/startOf/startOf.ts:16](https://github.com/TanStack/time/blob/main/packages/time/src/date/startOf/startOf.ts#L16)
diff --git a/docs/reference/interfaces/SubtractOptions.md b/docs/reference/interfaces/SubtractOptions.md
new file mode 100644
index 00000000..06f82129
--- /dev/null
+++ b/docs/reference/interfaces/SubtractOptions.md
@@ -0,0 +1,70 @@
+---
+id: SubtractOptions
+title: SubtractOptions
+---
+
+# Interface: SubtractOptions
+
+Defined in: [date/subtract/subtract.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/subtract/subtract.ts#L5)
+
+## Extends
+
+- `DateOperationOptions`
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.calendar
+```
+
+***
+
+### duration
+
+```ts
+duration: DurationLike;
+```
+
+Defined in: [date/subtract/subtract.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/subtract/subtract.ts#L6)
+
+***
+
+### returnFormat?
+
+```ts
+optional returnFormat: ReturnFormat;
+```
+
+Defined in: [date/withDateOperation/withDateOperation.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/date/withDateOperation/withDateOperation.ts#L9)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.returnFormat
+```
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+```ts
+DateOperationOptions.timeZone
+```
diff --git a/docs/reference/interfaces/TimeEventInfo.md b/docs/reference/interfaces/TimeEventInfo.md
new file mode 100644
index 00000000..3c7c6e56
--- /dev/null
+++ b/docs/reference/interfaces/TimeEventInfo.md
@@ -0,0 +1,48 @@
+---
+id: TimeEventInfo
+title: TimeEventInfo
+---
+
+# Interface: TimeEventInfo
+
+Defined in: [client/TimeClient.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L7)
+
+## Properties
+
+### end
+
+```ts
+end: string;
+```
+
+Defined in: [client/TimeClient.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L11)
+
+***
+
+### eventId
+
+```ts
+eventId: string;
+```
+
+Defined in: [client/TimeClient.ts:8](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L8)
+
+***
+
+### eventTitle
+
+```ts
+eventTitle: string;
+```
+
+Defined in: [client/TimeClient.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L9)
+
+***
+
+### start
+
+```ts
+start: string;
+```
+
+Defined in: [client/TimeClient.ts:10](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L10)
diff --git a/docs/reference/interfaces/TimeEventMap.md b/docs/reference/interfaces/TimeEventMap.md
new file mode 100644
index 00000000..0e0bf676
--- /dev/null
+++ b/docs/reference/interfaces/TimeEventMap.md
@@ -0,0 +1,244 @@
+---
+id: TimeEventMap
+title: TimeEventMap
+---
+
+# Interface: TimeEventMap
+
+Defined in: [client/TimeClient.ts:17](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L17)
+
+Event map for TimeClient events
+
+## Properties
+
+### time:calendar:navigate
+
+```ts
+time:calendar:navigate: object;
+```
+
+Defined in: [client/TimeClient.ts:48](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L48)
+
+#### direction
+
+```ts
+direction: "previous" | "next" | "current" | "specific";
+```
+
+#### targetDate
+
+```ts
+targetDate: string;
+```
+
+***
+
+### time:calendar:viewMode:changed
+
+```ts
+time:calendar:viewMode:changed: object;
+```
+
+Defined in: [client/TimeClient.ts:52](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L52)
+
+#### viewMode
+
+```ts
+viewMode: object;
+```
+
+##### viewMode.unit
+
+```ts
+unit: string;
+```
+
+##### viewMode.value
+
+```ts
+value: number;
+```
+
+***
+
+### time:event:added
+
+```ts
+time:event:added: TimeEventInfo;
+```
+
+Defined in: [client/TimeClient.ts:18](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L18)
+
+***
+
+### time:event:redo
+
+```ts
+time:event:redo: object;
+```
+
+Defined in: [client/TimeClient.ts:31](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L31)
+
+#### added
+
+```ts
+added: TimeEventInfo[];
+```
+
+#### removed
+
+```ts
+removed: TimeEventInfo[];
+```
+
+#### updated
+
+```ts
+updated: TimeEventInfo[];
+```
+
+***
+
+### time:event:removed
+
+```ts
+time:event:removed: TimeEventInfo;
+```
+
+Defined in: [client/TimeClient.ts:25](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L25)
+
+***
+
+### time:event:resized
+
+```ts
+time:event:resized: TimeEventInfo;
+```
+
+Defined in: [client/TimeClient.ts:36](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L36)
+
+***
+
+### time:event:undo
+
+```ts
+time:event:undo: object;
+```
+
+Defined in: [client/TimeClient.ts:26](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L26)
+
+#### added
+
+```ts
+added: TimeEventInfo[];
+```
+
+#### removed
+
+```ts
+removed: TimeEventInfo[];
+```
+
+#### updated
+
+```ts
+updated: TimeEventInfo[];
+```
+
+***
+
+### time:event:update:error
+
+```ts
+time:event:update:error: object;
+```
+
+Defined in: [client/TimeClient.ts:37](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L37)
+
+#### attemptedEnd?
+
+```ts
+optional attemptedEnd: string;
+```
+
+#### attemptedStart?
+
+```ts
+optional attemptedStart: string;
+```
+
+#### conflicts?
+
+```ts
+optional conflicts: AvailabilityConflict[];
+```
+
+#### eventId
+
+```ts
+eventId: string;
+```
+
+#### eventTitle
+
+```ts
+eventTitle: string;
+```
+
+#### message
+
+```ts
+message: string;
+```
+
+#### originalEnd
+
+```ts
+originalEnd: string;
+```
+
+#### originalStart
+
+```ts
+originalStart: string;
+```
+
+#### reason
+
+```ts
+reason: "unavailable-time" | "invalid-time" | "min-duration" | "blocked";
+```
+
+***
+
+### time:event:updated
+
+```ts
+time:event:updated: TimeEventInfo & object;
+```
+
+Defined in: [client/TimeClient.ts:22](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L22)
+
+#### Type Declaration
+
+##### updates
+
+```ts
+updates: Record<string, unknown>;
+```
+
+***
+
+### time:events:set
+
+```ts
+time:events:set: object;
+```
+
+Defined in: [client/TimeClient.ts:19](https://github.com/TanStack/time/blob/main/packages/time/src/client/TimeClient.ts#L19)
+
+#### events
+
+```ts
+events: TimeEventInfo[];
+```
diff --git a/docs/reference/interfaces/TimeSlot.md b/docs/reference/interfaces/TimeSlot.md
new file mode 100644
index 00000000..79c11d46
--- /dev/null
+++ b/docs/reference/interfaces/TimeSlot.md
@@ -0,0 +1,38 @@
+---
+id: TimeSlot
+title: TimeSlot
+---
+
+# Interface: TimeSlot
+
+Defined in: [calendar/types.ts:157](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L157)
+
+## Properties
+
+### hour
+
+```ts
+hour: number;
+```
+
+Defined in: [calendar/types.ts:158](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L158)
+
+***
+
+### label
+
+```ts
+label: string;
+```
+
+Defined in: [calendar/types.ts:160](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L160)
+
+***
+
+### minute
+
+```ts
+minute: number;
+```
+
+Defined in: [calendar/types.ts:159](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L159)
diff --git a/docs/reference/interfaces/TimelineEventLayout.md b/docs/reference/interfaces/TimelineEventLayout.md
new file mode 100644
index 00000000..773814c2
--- /dev/null
+++ b/docs/reference/interfaces/TimelineEventLayout.md
@@ -0,0 +1,82 @@
+---
+id: TimelineEventLayout
+title: TimelineEventLayout
+---
+
+# Interface: TimelineEventLayout\<TResource, TEvent\>
+
+Defined in: [calendar/types.ts:251](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L251)
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](Resource.md) = [`Resource`](Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](Event.md)\<`TResource`\> = [`Event`](Event.md)\<`TResource`\>
+
+## Properties
+
+### event
+
+```ts
+event: TEvent;
+```
+
+Defined in: [calendar/types.ts:255](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L255)
+
+***
+
+### isEndClipped
+
+```ts
+isEndClipped: boolean;
+```
+
+Defined in: [calendar/types.ts:262](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L262)
+
+True when the event ends after the last visible day (right edge is clipped)
+
+***
+
+### isStartClipped
+
+```ts
+isStartClipped: boolean;
+```
+
+Defined in: [calendar/types.ts:260](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L260)
+
+True when the event starts before the first visible day (left edge is clipped)
+
+***
+
+### lane
+
+```ts
+lane: number;
+```
+
+Defined in: [calendar/types.ts:258](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L258)
+
+***
+
+### left
+
+```ts
+left: number;
+```
+
+Defined in: [calendar/types.ts:256](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L256)
+
+***
+
+### width
+
+```ts
+width: number;
+```
+
+Defined in: [calendar/types.ts:257](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L257)
diff --git a/docs/reference/interfaces/TimelineLayout.md b/docs/reference/interfaces/TimelineLayout.md
new file mode 100644
index 00000000..3e96f7be
--- /dev/null
+++ b/docs/reference/interfaces/TimelineLayout.md
@@ -0,0 +1,38 @@
+---
+id: TimelineLayout
+title: TimelineLayout
+---
+
+# Interface: TimelineLayout\<TResource, TEvent\>
+
+Defined in: [calendar/types.ts:274](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L274)
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](Resource.md) = [`Resource`](Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](Event.md)\<`TResource`\> = [`Event`](Event.md)\<`TResource`\>
+
+## Properties
+
+### currentTimePosition
+
+```ts
+currentTimePosition: number | null;
+```
+
+Defined in: [calendar/types.ts:279](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L279)
+
+***
+
+### rows
+
+```ts
+rows: TimelineResourceRow<TResource, TEvent>[];
+```
+
+Defined in: [calendar/types.ts:278](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L278)
diff --git a/docs/reference/interfaces/TimelineResizePreviewOptions.md b/docs/reference/interfaces/TimelineResizePreviewOptions.md
new file mode 100644
index 00000000..fa2a7b02
--- /dev/null
+++ b/docs/reference/interfaces/TimelineResizePreviewOptions.md
@@ -0,0 +1,48 @@
+---
+id: TimelineResizePreviewOptions
+title: TimelineResizePreviewOptions
+---
+
+# Interface: TimelineResizePreviewOptions
+
+Defined in: [calendar/getResizeProps.ts:437](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L437)
+
+## Properties
+
+### firstDayIso
+
+```ts
+firstDayIso: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:440](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L440)
+
+***
+
+### previewEnd
+
+```ts
+previewEnd: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:439](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L439)
+
+***
+
+### previewStart
+
+```ts
+previewStart: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:438](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L438)
+
+***
+
+### totalDays
+
+```ts
+totalDays: number;
+```
+
+Defined in: [calendar/getResizeProps.ts:441](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L441)
diff --git a/docs/reference/interfaces/TimelineResizePreviewStyle.md b/docs/reference/interfaces/TimelineResizePreviewStyle.md
new file mode 100644
index 00000000..eae1906c
--- /dev/null
+++ b/docs/reference/interfaces/TimelineResizePreviewStyle.md
@@ -0,0 +1,28 @@
+---
+id: TimelineResizePreviewStyle
+title: TimelineResizePreviewStyle
+---
+
+# Interface: TimelineResizePreviewStyle
+
+Defined in: [calendar/getResizeProps.ts:444](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L444)
+
+## Properties
+
+### left
+
+```ts
+left: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:445](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L445)
+
+***
+
+### width
+
+```ts
+width: string;
+```
+
+Defined in: [calendar/getResizeProps.ts:446](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L446)
diff --git a/docs/reference/interfaces/TimelineResourceRow.md b/docs/reference/interfaces/TimelineResourceRow.md
new file mode 100644
index 00000000..94288477
--- /dev/null
+++ b/docs/reference/interfaces/TimelineResourceRow.md
@@ -0,0 +1,48 @@
+---
+id: TimelineResourceRow
+title: TimelineResourceRow
+---
+
+# Interface: TimelineResourceRow\<TResource, TEvent\>
+
+Defined in: [calendar/types.ts:265](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L265)
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](Resource.md) = [`Resource`](Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](Event.md)\<`TResource`\> = [`Event`](Event.md)\<`TResource`\>
+
+## Properties
+
+### events
+
+```ts
+events: TimelineEventLayout<TResource, TEvent>[];
+```
+
+Defined in: [calendar/types.ts:270](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L270)
+
+***
+
+### laneCount
+
+```ts
+laneCount: number;
+```
+
+Defined in: [calendar/types.ts:271](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L271)
+
+***
+
+### resource
+
+```ts
+resource: TResource;
+```
+
+Defined in: [calendar/types.ts:269](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L269)
diff --git a/docs/reference/interfaces/UnavailabilityReason.md b/docs/reference/interfaces/UnavailabilityReason.md
new file mode 100644
index 00000000..031da546
--- /dev/null
+++ b/docs/reference/interfaces/UnavailabilityReason.md
@@ -0,0 +1,88 @@
+---
+id: UnavailabilityReason
+title: UnavailabilityReason
+---
+
+# Interface: UnavailabilityReason
+
+Defined in: [calendar/types.ts:186](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L186)
+
+Information about why a resource is unavailable
+
+## Properties
+
+### capacityInfo?
+
+```ts
+optional capacityInfo: object;
+```
+
+Defined in: [calendar/types.ts:196](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L196)
+
+Current capacity usage if applicable
+
+#### max
+
+```ts
+max: number;
+```
+
+#### remaining
+
+```ts
+remaining: number;
+```
+
+#### used
+
+```ts
+used: number;
+```
+
+***
+
+### description
+
+```ts
+description: string;
+```
+
+Defined in: [calendar/types.ts:194](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L194)
+
+Human-readable explanation
+
+***
+
+### reason
+
+```ts
+reason: "outside-hours" | "capacity" | "no-availability";
+```
+
+Defined in: [calendar/types.ts:192](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L192)
+
+Why the resource is unavailable
+
+***
+
+### resourceId
+
+```ts
+resourceId: string;
+```
+
+Defined in: [calendar/types.ts:188](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L188)
+
+Resource ID
+
+***
+
+### resourceLabel
+
+```ts
+resourceLabel: string;
+```
+
+Defined in: [calendar/types.ts:190](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L190)
+
+Resource label/name
diff --git a/docs/reference/interfaces/UnavailableRange.md b/docs/reference/interfaces/UnavailableRange.md
new file mode 100644
index 00000000..a1765ba7
--- /dev/null
+++ b/docs/reference/interfaces/UnavailableRange.md
@@ -0,0 +1,56 @@
+---
+id: UnavailableRange
+title: UnavailableRange
+---
+
+# Interface: UnavailableRange
+
+Defined in: [calendar/types.ts:163](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L163)
+
+## Properties
+
+### endTime
+
+```ts
+endTime: string;
+```
+
+Defined in: [calendar/types.ts:171](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L171)
+
+End time as HH:mm string
+
+***
+
+### height
+
+```ts
+height: number;
+```
+
+Defined in: [calendar/types.ts:167](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L167)
+
+Height in pixels
+
+***
+
+### startTime
+
+```ts
+startTime: string;
+```
+
+Defined in: [calendar/types.ts:169](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L169)
+
+Start time as HH:mm string
+
+***
+
+### top
+
+```ts
+top: number;
+```
+
+Defined in: [calendar/types.ts:165](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L165)
+
+Top position in pixels
diff --git a/docs/reference/interfaces/UnavailableTimeRange.md b/docs/reference/interfaces/UnavailableTimeRange.md
new file mode 100644
index 00000000..8ae1abf4
--- /dev/null
+++ b/docs/reference/interfaces/UnavailableTimeRange.md
@@ -0,0 +1,32 @@
+---
+id: UnavailableTimeRange
+title: UnavailableTimeRange
+---
+
+# Interface: UnavailableTimeRange
+
+Defined in: [calendar/getResizeProps.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L5)
+
+## Properties
+
+### endMinutes
+
+```ts
+endMinutes: number;
+```
+
+Defined in: [calendar/getResizeProps.ts:9](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L9)
+
+End time in minutes from midnight (0-1440)
+
+***
+
+### startMinutes
+
+```ts
+startMinutes: number;
+```
+
+Defined in: [calendar/getResizeProps.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L7)
+
+Start time in minutes from midnight (0-1440)
diff --git a/docs/reference/interfaces/UntilOptions.md b/docs/reference/interfaces/UntilOptions.md
new file mode 100644
index 00000000..6eb7aa61
--- /dev/null
+++ b/docs/reference/interfaces/UntilOptions.md
@@ -0,0 +1,50 @@
+---
+id: UntilOptions
+title: UntilOptions
+---
+
+# Interface: UntilOptions
+
+Defined in: [date/until/until.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/until/until.ts#L6)
+
+## Extends
+
+- [`DateOptions`](DateOptions.md)
+
+## Properties
+
+### calendar?
+
+```ts
+optional calendar: string;
+```
+
+Defined in: [date/types.ts:11](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L11)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`calendar`](DateOptions.md#calendar)
+
+***
+
+### timeZone?
+
+```ts
+optional timeZone: string;
+```
+
+Defined in: [date/types.ts:12](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L12)
+
+#### Inherited from
+
+[`DateOptions`](DateOptions.md).[`timeZone`](DateOptions.md#timezone)
+
+***
+
+### unit
+
+```ts
+unit: DateTimeUnit;
+```
+
+Defined in: [date/until/until.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/until/until.ts#L7)
diff --git a/docs/reference/interfaces/ValidateResizeOptions.md b/docs/reference/interfaces/ValidateResizeOptions.md
new file mode 100644
index 00000000..a6c702b8
--- /dev/null
+++ b/docs/reference/interfaces/ValidateResizeOptions.md
@@ -0,0 +1,98 @@
+---
+id: ValidateResizeOptions
+title: ValidateResizeOptions
+---
+
+# Interface: ValidateResizeOptions
+
+Defined in: [calendar/calendar.ts:291](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L291)
+
+## Properties
+
+### constraints?
+
+```ts
+optional constraints: ResizeConstraints;
+```
+
+Defined in: [calendar/calendar.ts:300](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L300)
+
+***
+
+### edge
+
+```ts
+edge: ResizeEdge;
+```
+
+Defined in: [calendar/calendar.ts:295](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L295)
+
+***
+
+### eventId
+
+```ts
+eventId: string;
+```
+
+Defined in: [calendar/calendar.ts:292](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L292)
+
+***
+
+### occurrenceStart?
+
+```ts
+optional occurrenceStart: EventDateTimeInput;
+```
+
+Defined in: [calendar/calendar.ts:299](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L299)
+
+***
+
+### originalDayDate
+
+```ts
+originalDayDate: string;
+```
+
+Defined in: [calendar/calendar.ts:298](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L298)
+
+***
+
+### originalEnd
+
+```ts
+originalEnd: string;
+```
+
+Defined in: [calendar/calendar.ts:294](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L294)
+
+***
+
+### originalStart
+
+```ts
+originalStart: string;
+```
+
+Defined in: [calendar/calendar.ts:293](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L293)
+
+***
+
+### targetDayDate
+
+```ts
+targetDayDate: string;
+```
+
+Defined in: [calendar/calendar.ts:297](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L297)
+
+***
+
+### totalDeltaMinutes
+
+```ts
+totalDeltaMinutes: number;
+```
+
+Defined in: [calendar/calendar.ts:296](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L296)
diff --git a/docs/reference/interfaces/ValidateResizeResult.md b/docs/reference/interfaces/ValidateResizeResult.md
new file mode 100644
index 00000000..4ae7bdb9
--- /dev/null
+++ b/docs/reference/interfaces/ValidateResizeResult.md
@@ -0,0 +1,84 @@
+---
+id: ValidateResizeResult
+title: ValidateResizeResult
+---
+
+# Interface: ValidateResizeResult
+
+Defined in: [calendar/calendar.ts:303](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L303)
+
+## Properties
+
+### blocked
+
+```ts
+blocked: boolean;
+```
+
+Defined in: [calendar/calendar.ts:304](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L304)
+
+***
+
+### error?
+
+```ts
+optional error: object;
+```
+
+Defined in: [calendar/calendar.ts:305](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L305)
+
+#### conflicts
+
+```ts
+conflicts: AvailabilityConflict[];
+```
+
+#### message
+
+```ts
+message: string;
+```
+
+#### reason
+
+```ts
+reason: "unavailable-time" | "invalid-time" | "min-duration" | "blocked";
+```
+
+***
+
+### result
+
+```ts
+result: object;
+```
+
+Defined in: [calendar/calendar.ts:310](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L310)
+
+#### durationMinutes
+
+```ts
+durationMinutes: number;
+```
+
+#### end
+
+```ts
+end: string;
+```
+
+#### start
+
+```ts
+start: string;
+```
+
+***
+
+### targetDayDate
+
+```ts
+targetDayDate: string;
+```
+
+Defined in: [calendar/calendar.ts:315](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/calendar.ts#L315)
diff --git a/docs/reference/interfaces/ViewMode.md b/docs/reference/interfaces/ViewMode.md
new file mode 100644
index 00000000..b2e80af0
--- /dev/null
+++ b/docs/reference/interfaces/ViewMode.md
@@ -0,0 +1,35 @@
+---
+id: ViewMode
+title: ViewMode
+---
+
+# Interface: ViewMode
+
+Defined in: [calendar/types.ts:94](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L94)
+
+Represents the configuration for the current viewing mode of a calendar,
+specifying the scale and unit of time.
+
+## Properties
+
+### unit
+
+```ts
+unit: "month" | "day" | "week" | "workWeek";
+```
+
+Defined in: [calendar/types.ts:98](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L98)
+
+The unit of time that the calendar view should display (month, week, workWeek or day).
+
+***
+
+### value
+
+```ts
+value: number;
+```
+
+Defined in: [calendar/types.ts:96](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L96)
+
+The number of units for the view mode.
diff --git a/docs/reference/type-aliases/CeilUnit.md b/docs/reference/type-aliases/CeilUnit.md
new file mode 100644
index 00000000..a12abd15
--- /dev/null
+++ b/docs/reference/type-aliases/CeilUnit.md
@@ -0,0 +1,19 @@
+---
+id: CeilUnit
+title: CeilUnit
+---
+
+# Type Alias: CeilUnit
+
+```ts
+type CeilUnit = 
+  | "day"
+  | "hour"
+  | "minute"
+  | "second"
+  | "millisecond"
+  | "microsecond"
+  | "nanosecond";
+```
+
+Defined in: [date/ceil/ceil.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/ceil/ceil.ts#L5)
diff --git a/docs/reference/type-aliases/CountUnit.md b/docs/reference/type-aliases/CountUnit.md
new file mode 100644
index 00000000..07abb0f3
--- /dev/null
+++ b/docs/reference/type-aliases/CountUnit.md
@@ -0,0 +1,20 @@
+---
+id: CountUnit
+title: CountUnit
+---
+
+# Type Alias: CountUnit
+
+```ts
+type CountUnit = 
+  | "year"
+  | "month"
+  | "week"
+  | "day"
+  | "hour"
+  | "minute"
+  | "second"
+  | "millisecond";
+```
+
+Defined in: [date/count/count.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/count/count.ts#L5)
diff --git a/docs/reference/type-aliases/DateInput.md b/docs/reference/type-aliases/DateInput.md
new file mode 100644
index 00000000..a62d63b6
--- /dev/null
+++ b/docs/reference/type-aliases/DateInput.md
@@ -0,0 +1,12 @@
+---
+id: DateInput
+title: DateInput
+---
+
+# Type Alias: DateInput
+
+```ts
+type DateInput = string | number | Date | Temporal.ZonedDateTime | Temporal.PlainDate;
+```
+
+Defined in: [date/types.ts:3](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L3)
diff --git a/docs/reference/type-aliases/Day.md b/docs/reference/type-aliases/Day.md
new file mode 100644
index 00000000..aa5754f2
--- /dev/null
+++ b/docs/reference/type-aliases/Day.md
@@ -0,0 +1,88 @@
+---
+id: Day
+title: Day
+---
+
+# Type Alias: Day\<TResource, TEvent\>
+
+```ts
+type Day<TResource, TEvent> = object;
+```
+
+Defined in: [calendar/types.ts:137](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L137)
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](../interfaces/Resource.md) = [`Resource`](../interfaces/Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](../interfaces/Event.md)\<`TResource`\> = [`Event`](../interfaces/Event.md)\<`TResource`\>
+
+## Properties
+
+### allDayEvents
+
+```ts
+allDayEvents: TEvent[];
+```
+
+Defined in: [calendar/types.ts:147](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L147)
+
+All-day events occurring on this day (segments of multi-day all-day events included).
+
+***
+
+### date
+
+```ts
+date: Temporal.PlainDate;
+```
+
+Defined in: [calendar/types.ts:141](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L141)
+
+***
+
+### events
+
+```ts
+events: TEvent[];
+```
+
+Defined in: [calendar/types.ts:145](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L145)
+
+Timed events occurring on this day (sub-day events + segments of timed multi-day events).
+
+***
+
+### isInCurrentPeriod
+
+```ts
+isInCurrentPeriod: boolean;
+```
+
+Defined in: [calendar/types.ts:149](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L149)
+
+***
+
+### isoDate
+
+```ts
+isoDate: string;
+```
+
+Defined in: [calendar/types.ts:143](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L143)
+
+Pre-computed ISO date string (YYYY-MM-DD) — use instead of manually formatting `date`
+
+***
+
+### isToday
+
+```ts
+isToday: boolean;
+```
+
+Defined in: [calendar/types.ts:148](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L148)
diff --git a/docs/reference/type-aliases/DependencyType.md b/docs/reference/type-aliases/DependencyType.md
new file mode 100644
index 00000000..dfee64f8
--- /dev/null
+++ b/docs/reference/type-aliases/DependencyType.md
@@ -0,0 +1,14 @@
+---
+id: DependencyType
+title: DependencyType
+---
+
+# Type Alias: DependencyType
+
+```ts
+type DependencyType = "FS" | "SS" | "FF" | "SF";
+```
+
+Defined in: [calendar/types.ts:10](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L10)
+
+Supported dependency types for ordering events.
diff --git a/docs/reference/type-aliases/DurationLike.md b/docs/reference/type-aliases/DurationLike.md
new file mode 100644
index 00000000..ecdccc6f
--- /dev/null
+++ b/docs/reference/type-aliases/DurationLike.md
@@ -0,0 +1,12 @@
+---
+id: DurationLike
+title: DurationLike
+---
+
+# Type Alias: DurationLike
+
+```ts
+type DurationLike = Temporal.DurationLike;
+```
+
+Defined in: [date/types.ts:15](https://github.com/TanStack/time/blob/main/packages/time/src/date/types.ts#L15)
diff --git a/docs/reference/type-aliases/EndOfUnit.md b/docs/reference/type-aliases/EndOfUnit.md
new file mode 100644
index 00000000..56e11564
--- /dev/null
+++ b/docs/reference/type-aliases/EndOfUnit.md
@@ -0,0 +1,20 @@
+---
+id: EndOfUnit
+title: EndOfUnit
+---
+
+# Type Alias: EndOfUnit
+
+```ts
+type EndOfUnit = 
+  | "year"
+  | "month"
+  | "week"
+  | "day"
+  | "hour"
+  | "minute"
+  | "second"
+  | "millisecond";
+```
+
+Defined in: [date/endOf/endOf.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/endOf/endOf.ts#L5)
diff --git a/docs/reference/type-aliases/EqualsUnit.md b/docs/reference/type-aliases/EqualsUnit.md
new file mode 100644
index 00000000..57c99027
--- /dev/null
+++ b/docs/reference/type-aliases/EqualsUnit.md
@@ -0,0 +1,20 @@
+---
+id: EqualsUnit
+title: EqualsUnit
+---
+
+# Type Alias: EqualsUnit
+
+```ts
+type EqualsUnit = 
+  | "year"
+  | "month"
+  | "week"
+  | "day"
+  | "hour"
+  | "minute"
+  | "second"
+  | "millisecond";
+```
+
+Defined in: [date/equals/equals.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/equals/equals.ts#L6)
diff --git a/docs/reference/type-aliases/EventDateTimeInput.md b/docs/reference/type-aliases/EventDateTimeInput.md
new file mode 100644
index 00000000..b7043b47
--- /dev/null
+++ b/docs/reference/type-aliases/EventDateTimeInput.md
@@ -0,0 +1,12 @@
+---
+id: EventDateTimeInput
+title: EventDateTimeInput
+---
+
+# Type Alias: EventDateTimeInput
+
+```ts
+type EventDateTimeInput = string | Date | number;
+```
+
+Defined in: [calendar/types.ts:4](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L4)
diff --git a/docs/reference/type-aliases/FormatType.md b/docs/reference/type-aliases/FormatType.md
new file mode 100644
index 00000000..3d72d75f
--- /dev/null
+++ b/docs/reference/type-aliases/FormatType.md
@@ -0,0 +1,12 @@
+---
+id: FormatType
+title: FormatType
+---
+
+# Type Alias: FormatType
+
+```ts
+type FormatType = "date" | "time" | "datetime";
+```
+
+Defined in: [date/format/format.ts:14](https://github.com/TanStack/time/blob/main/packages/time/src/date/format/format.ts#L14)
diff --git a/docs/reference/type-aliases/GroupDaysByProps.md b/docs/reference/type-aliases/GroupDaysByProps.md
new file mode 100644
index 00000000..1f5551b4
--- /dev/null
+++ b/docs/reference/type-aliases/GroupDaysByProps.md
@@ -0,0 +1,24 @@
+---
+id: GroupDaysByProps
+title: GroupDaysByProps
+---
+
+# Type Alias: GroupDaysByProps\<TResource, TEvent\>
+
+```ts
+type GroupDaysByProps<TResource, TEvent> = 
+  | GroupDaysByMonthProps<TResource, TEvent>
+| GroupDaysByWeekProps<TResource, TEvent>;
+```
+
+Defined in: [calendar/groupDaysBy.ts:30](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/groupDaysBy.ts#L30)
+
+## Type Parameters
+
+### TResource
+
+`TResource` *extends* [`Resource`](../interfaces/Resource.md)
+
+### TEvent
+
+`TEvent` *extends* [`Event`](../interfaces/Event.md)\<`TResource`\> = [`Event`](../interfaces/Event.md)\<`TResource`\>
diff --git a/docs/reference/type-aliases/IsSameOrAfterUnit.md b/docs/reference/type-aliases/IsSameOrAfterUnit.md
new file mode 100644
index 00000000..3c795455
--- /dev/null
+++ b/docs/reference/type-aliases/IsSameOrAfterUnit.md
@@ -0,0 +1,20 @@
+---
+id: IsSameOrAfterUnit
+title: IsSameOrAfterUnit
+---
+
+# Type Alias: IsSameOrAfterUnit
+
+```ts
+type IsSameOrAfterUnit = 
+  | "year"
+  | "month"
+  | "week"
+  | "day"
+  | "hour"
+  | "minute"
+  | "second"
+  | "millisecond";
+```
+
+Defined in: [date/isSameOrAfter/isSameOrAfter.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/isSameOrAfter/isSameOrAfter.ts#L7)
diff --git a/docs/reference/type-aliases/IsSameOrBeforeUnit.md b/docs/reference/type-aliases/IsSameOrBeforeUnit.md
new file mode 100644
index 00000000..7552ceb0
--- /dev/null
+++ b/docs/reference/type-aliases/IsSameOrBeforeUnit.md
@@ -0,0 +1,20 @@
+---
+id: IsSameOrBeforeUnit
+title: IsSameOrBeforeUnit
+---
+
+# Type Alias: IsSameOrBeforeUnit
+
+```ts
+type IsSameOrBeforeUnit = 
+  | "year"
+  | "month"
+  | "week"
+  | "day"
+  | "hour"
+  | "minute"
+  | "second"
+  | "millisecond";
+```
+
+Defined in: [date/isSameOrBefore/isSameOrBefore.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/date/isSameOrBefore/isSameOrBefore.ts#L7)
diff --git a/docs/reference/type-aliases/RecurrenceEditScope.md b/docs/reference/type-aliases/RecurrenceEditScope.md
new file mode 100644
index 00000000..b761e844
--- /dev/null
+++ b/docs/reference/type-aliases/RecurrenceEditScope.md
@@ -0,0 +1,14 @@
+---
+id: RecurrenceEditScope
+title: RecurrenceEditScope
+---
+
+# Type Alias: RecurrenceEditScope
+
+```ts
+type RecurrenceEditScope = "this" | "thisAndFollowing" | "all";
+```
+
+Defined in: [calendar/types.ts:19](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L19)
+
+Scope used when editing/removing a recurring event series.
diff --git a/docs/reference/type-aliases/RecurrenceFrequency.md b/docs/reference/type-aliases/RecurrenceFrequency.md
new file mode 100644
index 00000000..c9b2d7fc
--- /dev/null
+++ b/docs/reference/type-aliases/RecurrenceFrequency.md
@@ -0,0 +1,14 @@
+---
+id: RecurrenceFrequency
+title: RecurrenceFrequency
+---
+
+# Type Alias: RecurrenceFrequency
+
+```ts
+type RecurrenceFrequency = "daily" | "weekly" | "monthly" | "yearly";
+```
+
+Defined in: [calendar/types.ts:7](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L7)
+
+How often a recurring event repeats.
diff --git a/docs/reference/type-aliases/ResizeEdge.md b/docs/reference/type-aliases/ResizeEdge.md
new file mode 100644
index 00000000..7bb627f3
--- /dev/null
+++ b/docs/reference/type-aliases/ResizeEdge.md
@@ -0,0 +1,12 @@
+---
+id: ResizeEdge
+title: ResizeEdge
+---
+
+# Type Alias: ResizeEdge
+
+```ts
+type ResizeEdge = "top" | "bottom" | "left" | "right";
+```
+
+Defined in: [calendar/getResizeProps.ts:3](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/getResizeProps.ts#L3)
diff --git a/docs/reference/type-aliases/ResizeListener.md b/docs/reference/type-aliases/ResizeListener.md
new file mode 100644
index 00000000..286c0fd5
--- /dev/null
+++ b/docs/reference/type-aliases/ResizeListener.md
@@ -0,0 +1,16 @@
+---
+id: ResizeListener
+title: ResizeListener
+---
+
+# Type Alias: ResizeListener()
+
+```ts
+type ResizeListener = () => void;
+```
+
+Defined in: [calendar/resizeController.ts:63](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/resizeController.ts#L63)
+
+## Returns
+
+`void`
diff --git a/docs/reference/type-aliases/RoundUnit.md b/docs/reference/type-aliases/RoundUnit.md
new file mode 100644
index 00000000..c6f6620b
--- /dev/null
+++ b/docs/reference/type-aliases/RoundUnit.md
@@ -0,0 +1,19 @@
+---
+id: RoundUnit
+title: RoundUnit
+---
+
+# Type Alias: RoundUnit
+
+```ts
+type RoundUnit = 
+  | "day"
+  | "hour"
+  | "minute"
+  | "second"
+  | "millisecond"
+  | "microsecond"
+  | "nanosecond";
+```
+
+Defined in: [date/round/round.ts:6](https://github.com/TanStack/time/blob/main/packages/time/src/date/round/round.ts#L6)
diff --git a/docs/reference/type-aliases/SaveEventResult.md b/docs/reference/type-aliases/SaveEventResult.md
new file mode 100644
index 00000000..e14b7e5b
--- /dev/null
+++ b/docs/reference/type-aliases/SaveEventResult.md
@@ -0,0 +1,21 @@
+---
+id: SaveEventResult
+title: SaveEventResult
+---
+
+# Type Alias: SaveEventResult
+
+```ts
+type SaveEventResult = 
+  | {
+  success: true;
+}
+  | {
+  error: ResizeError;
+  success: false;
+};
+```
+
+Defined in: [calendar/types.ts:247](https://github.com/TanStack/time/blob/main/packages/time/src/calendar/types.ts#L247)
+
+Result of a CalendarActions.saveEvent call.
diff --git a/docs/reference/type-aliases/StartOfUnit.md b/docs/reference/type-aliases/StartOfUnit.md
new file mode 100644
index 00000000..50b40116
--- /dev/null
+++ b/docs/reference/type-aliases/StartOfUnit.md
@@ -0,0 +1,20 @@
+---
+id: StartOfUnit
+title: StartOfUnit
+---
+
+# Type Alias: StartOfUnit
+
+```ts
+type StartOfUnit = 
+  | "year"
+  | "month"
+  | "week"
+  | "day"
+  | "hour"
+  | "minute"
+  | "second"
+  | "millisecond";
+```
+
+Defined in: [date/startOf/startOf.ts:5](https://github.com/TanStack/time/blob/main/packages/time/src/date/startOf/startOf.ts#L5)
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 00000000..b97eeed3
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,23 @@
+// @ts-check
+
+// @ts-ignore Needed due to moduleResolution Node vs Bundler
+import { tanstackConfig } from '@tanstack/eslint-config'
+import unusedImports from 'eslint-plugin-unused-imports'
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+  ...tanstackConfig,
+  {
+    name: 'tanstack/temp',
+    plugins: {
+      'unused-imports': unusedImports,
+    },
+    rules: {
+      'no-case-declarations': 'off',
+      'no-shadow': 'off',
+      'unused-imports/no-unused-imports': 'warn',
+      'pnpm/enforce-catalog': 'off',
+      'pnpm/json-enforce-catalog': 'off',
+    },
+  },
+]
diff --git a/examples/react/calendar/components.json b/examples/react/calendar/components.json
new file mode 100644
index 00000000..f5ebd862
--- /dev/null
+++ b/examples/react/calendar/components.json
@@ -0,0 +1,25 @@
+{
+  "$schema": "https://ui.shadcn.com/schema.json",
+  "style": "base-nova",
+  "rsc": false,
+  "tsx": true,
+  "tailwind": {
+    "config": "tailwind.config.js",
+    "css": "src/index.css",
+    "baseColor": "neutral",
+    "cssVariables": true,
+    "prefix": ""
+  },
+  "iconLibrary": "lucide",
+  "rtl": false,
+  "aliases": {
+    "components": "@/components",
+    "utils": "@/lib/utils",
+    "ui": "@/components/ui",
+    "lib": "@/lib",
+    "hooks": "@/hooks"
+  },
+  "menuColor": "default",
+  "menuAccent": "subtle",
+  "registries": {}
+}
diff --git a/examples/react/calendar/index.html b/examples/react/calendar/index.html
new file mode 100644
index 00000000..4615473f
--- /dev/null
+++ b/examples/react/calendar/index.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#0a0a0a" />
+    <title>TanStack Time - React Basic Example</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <script type="module" src="/src/index.tsx"></script>
+  </body>
+</html>
diff --git a/examples/react/calendar/package.json b/examples/react/calendar/package.json
new file mode 100644
index 00000000..43097400
--- /dev/null
+++ b/examples/react/calendar/package.json
@@ -0,0 +1,37 @@
+{
+  "name": "@tanstack/time-example-react-basic",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite --port=3005",
+    "build": "vite build",
+    "preview": "vite preview",
+    "test:types": "tsc"
+  },
+  "dependencies": {
+    "@base-ui/react": "^1.3.0",
+    "@fontsource-variable/geist": "^5.2.8",
+    "@tanstack/react-devtools": "^0.9.5",
+    "@tanstack/react-time": "^0.0.0",
+    "@tanstack/react-time-devtools": "^0.0.0",
+    "@tanstack/time": "^0.0.0",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-react": "^1.8.0",
+    "react": "^19.2.3",
+    "react-dom": "^19.2.3",
+    "shadcn": "^4.2.0",
+    "tailwind-merge": "^3.5.0",
+    "tw-animate-css": "^1.4.0"
+  },
+  "devDependencies": {
+    "@types/react": "^19.2.8",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^5.1.2",
+    "autoprefixer": "^10.4.20",
+    "postcss": "^8.4.49",
+    "tailwindcss": "^3.4.17",
+    "typescript": "5.9.3",
+    "vite": "^7.3.1"
+  }
+}
diff --git a/examples/react/calendar/postcss.config.js b/examples/react/calendar/postcss.config.js
new file mode 100644
index 00000000..2e7af2b7
--- /dev/null
+++ b/examples/react/calendar/postcss.config.js
@@ -0,0 +1,6 @@
+export default {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}
diff --git a/examples/react/calendar/src/components/ui/badge.tsx b/examples/react/calendar/src/components/ui/badge.tsx
new file mode 100644
index 00000000..83b3ed7d
--- /dev/null
+++ b/examples/react/calendar/src/components/ui/badge.tsx
@@ -0,0 +1,52 @@
+import { mergeProps } from '@base-ui/react/merge-props'
+import { useRender } from '@base-ui/react/use-render'
+import { cva, type VariantProps } from 'class-variance-authority'
+
+import { cn } from '@/lib/utils'
+
+const badgeVariants = cva(
+  'group/badge inline-flex h-5 w-fit shrink-0 items-center justify-center gap-1 overflow-hidden rounded-4xl border border-transparent px-2 py-0.5 text-xs font-medium whitespace-nowrap transition-all focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50 has-data-[icon=inline-end]:pr-1.5 has-data-[icon=inline-start]:pl-1.5 aria-invalid:border-destructive aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 [&>svg]:pointer-events-none [&>svg]:size-3!',
+  {
+    variants: {
+      variant: {
+        default: 'bg-primary text-primary-foreground [a]:hover:bg-primary/80',
+        secondary:
+          'bg-secondary text-secondary-foreground [a]:hover:bg-secondary/80',
+        destructive:
+          'bg-destructive/10 text-destructive focus-visible:ring-destructive/20 dark:bg-destructive/20 dark:focus-visible:ring-destructive/40 [a]:hover:bg-destructive/20',
+        outline:
+          'border-border text-foreground [a]:hover:bg-muted [a]:hover:text-muted-foreground',
+        ghost:
+          'hover:bg-muted hover:text-muted-foreground dark:hover:bg-muted/50',
+        link: 'text-primary underline-offset-4 hover:underline',
+      },
+    },
+    defaultVariants: {
+      variant: 'default',
+    },
+  },
+)
+
+function Badge({
+  className,
+  variant = 'default',
+  render,
+  ...props
+}: useRender.ComponentProps<'span'> & VariantProps<typeof badgeVariants>) {
+  return useRender({
+    defaultTagName: 'span',
+    props: mergeProps<'span'>(
+      {
+        className: cn(badgeVariants({ variant }), className),
+      },
+      props,
+    ),
+    render,
+    state: {
+      slot: 'badge',
+      variant,
+    },
+  })
+}
+
+export { Badge, badgeVariants }
diff --git a/examples/react/calendar/src/components/ui/button.tsx b/examples/react/calendar/src/components/ui/button.tsx
new file mode 100644
index 00000000..b520e871
--- /dev/null
+++ b/examples/react/calendar/src/components/ui/button.tsx
@@ -0,0 +1,58 @@
+import { Button as ButtonPrimitive } from '@base-ui/react/button'
+import { cva, type VariantProps } from 'class-variance-authority'
+
+import { cn } from '@/lib/utils'
+
+const buttonVariants = cva(
+  "group/button inline-flex shrink-0 items-center justify-center rounded-lg border border-transparent bg-clip-padding text-sm font-medium whitespace-nowrap transition-all outline-none select-none focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50 active:not-aria-[haspopup]:translate-y-px disabled:pointer-events-none disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-3 aria-invalid:ring-destructive/20 dark:aria-invalid:border-destructive/50 dark:aria-invalid:ring-destructive/40 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+  {
+    variants: {
+      variant: {
+        default: 'bg-primary text-primary-foreground [a]:hover:bg-primary/80',
+        outline:
+          'border-border bg-background hover:bg-muted hover:text-foreground aria-expanded:bg-muted aria-expanded:text-foreground dark:border-input dark:bg-input/30 dark:hover:bg-input/50',
+        secondary:
+          'bg-secondary text-secondary-foreground hover:bg-secondary/80 aria-expanded:bg-secondary aria-expanded:text-secondary-foreground',
+        ghost:
+          'hover:bg-muted hover:text-foreground aria-expanded:bg-muted aria-expanded:text-foreground dark:hover:bg-muted/50',
+        destructive:
+          'bg-destructive/10 text-destructive hover:bg-destructive/20 focus-visible:border-destructive/40 focus-visible:ring-destructive/20 dark:bg-destructive/20 dark:hover:bg-destructive/30 dark:focus-visible:ring-destructive/40',
+        link: 'text-primary underline-offset-4 hover:underline',
+      },
+      size: {
+        default:
+          'h-8 gap-1.5 px-2.5 has-data-[icon=inline-end]:pr-2 has-data-[icon=inline-start]:pl-2',
+        xs: "h-6 gap-1 rounded-[min(var(--radius-md),10px)] px-2 text-xs in-data-[slot=button-group]:rounded-lg has-data-[icon=inline-end]:pr-1.5 has-data-[icon=inline-start]:pl-1.5 [&_svg:not([class*='size-'])]:size-3",
+        sm: "h-7 gap-1 rounded-[min(var(--radius-md),12px)] px-2.5 text-[0.8rem] in-data-[slot=button-group]:rounded-lg has-data-[icon=inline-end]:pr-1.5 has-data-[icon=inline-start]:pl-1.5 [&_svg:not([class*='size-'])]:size-3.5",
+        lg: 'h-9 gap-1.5 px-2.5 has-data-[icon=inline-end]:pr-2 has-data-[icon=inline-start]:pl-2',
+        icon: 'size-8',
+        'icon-xs':
+          "size-6 rounded-[min(var(--radius-md),10px)] in-data-[slot=button-group]:rounded-lg [&_svg:not([class*='size-'])]:size-3",
+        'icon-sm':
+          'size-7 rounded-[min(var(--radius-md),12px)] in-data-[slot=button-group]:rounded-lg',
+        'icon-lg': 'size-9',
+      },
+    },
+    defaultVariants: {
+      variant: 'default',
+      size: 'default',
+    },
+  },
+)
+
+function Button({
+  className,
+  variant = 'default',
+  size = 'default',
+  ...props
+}: ButtonPrimitive.Props & VariantProps<typeof buttonVariants>) {
+  return (
+    <ButtonPrimitive
+      data-slot="button"
+      className={cn(buttonVariants({ variant, size, className }))}
+      {...props}
+    />
+  )
+}
+
+export { Button, buttonVariants }
diff --git a/examples/react/calendar/src/components/ui/card.tsx b/examples/react/calendar/src/components/ui/card.tsx
new file mode 100644
index 00000000..496806ea
--- /dev/null
+++ b/examples/react/calendar/src/components/ui/card.tsx
@@ -0,0 +1,103 @@
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+function Card({
+  className,
+  size = 'default',
+  ...props
+}: React.ComponentProps<'div'> & { size?: 'default' | 'sm' }) {
+  return (
+    <div
+      data-slot="card"
+      data-size={size}
+      className={cn(
+        'group/card flex flex-col gap-4 overflow-hidden rounded-xl bg-card py-4 text-sm text-card-foreground ring-1 ring-foreground/10 has-data-[slot=card-footer]:pb-0 has-[>img:first-child]:pt-0 data-[size=sm]:gap-3 data-[size=sm]:py-3 data-[size=sm]:has-data-[slot=card-footer]:pb-0 *:[img:first-child]:rounded-t-xl *:[img:last-child]:rounded-b-xl',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardHeader({ className, ...props }: React.ComponentProps<'div'>) {
+  return (
+    <div
+      data-slot="card-header"
+      className={cn(
+        'group/card-header @container/card-header grid auto-rows-min items-start gap-1 rounded-t-xl px-4 group-data-[size=sm]/card:px-3 has-data-[slot=card-action]:grid-cols-[1fr_auto] has-data-[slot=card-description]:grid-rows-[auto_auto] [.border-b]:pb-4 group-data-[size=sm]/card:[.border-b]:pb-3',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardTitle({ className, ...props }: React.ComponentProps<'div'>) {
+  return (
+    <div
+      data-slot="card-title"
+      className={cn(
+        'font-heading text-base leading-snug font-medium group-data-[size=sm]/card:text-sm',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardDescription({ className, ...props }: React.ComponentProps<'div'>) {
+  return (
+    <div
+      data-slot="card-description"
+      className={cn('text-sm text-muted-foreground', className)}
+      {...props}
+    />
+  )
+}
+
+function CardAction({ className, ...props }: React.ComponentProps<'div'>) {
+  return (
+    <div
+      data-slot="card-action"
+      className={cn(
+        'col-start-2 row-span-2 row-start-1 self-start justify-self-end',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardContent({ className, ...props }: React.ComponentProps<'div'>) {
+  return (
+    <div
+      data-slot="card-content"
+      className={cn('px-4 group-data-[size=sm]/card:px-3', className)}
+      {...props}
+    />
+  )
+}
+
+function CardFooter({ className, ...props }: React.ComponentProps<'div'>) {
+  return (
+    <div
+      data-slot="card-footer"
+      className={cn(
+        'flex items-center rounded-b-xl border-t bg-muted/50 p-4 group-data-[size=sm]/card:p-3',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+export {
+  Card,
+  CardHeader,
+  CardFooter,
+  CardTitle,
+  CardAction,
+  CardDescription,
+  CardContent,
+}
diff --git a/examples/react/calendar/src/components/ui/context-menu.tsx b/examples/react/calendar/src/components/ui/context-menu.tsx
new file mode 100644
index 00000000..90c213b1
--- /dev/null
+++ b/examples/react/calendar/src/components/ui/context-menu.tsx
@@ -0,0 +1,270 @@
+import * as React from 'react'
+import { ContextMenu as ContextMenuPrimitive } from '@base-ui/react/context-menu'
+
+import { cn } from '@/lib/utils'
+import { ChevronRightIcon, CheckIcon } from 'lucide-react'
+
+function ContextMenu({ ...props }: ContextMenuPrimitive.Root.Props) {
+  return <ContextMenuPrimitive.Root data-slot="context-menu" {...props} />
+}
+
+function ContextMenuPortal({ ...props }: ContextMenuPrimitive.Portal.Props) {
+  return (
+    <ContextMenuPrimitive.Portal data-slot="context-menu-portal" {...props} />
+  )
+}
+
+function ContextMenuTrigger({
+  className,
+  ...props
+}: ContextMenuPrimitive.Trigger.Props) {
+  return (
+    <ContextMenuPrimitive.Trigger
+      data-slot="context-menu-trigger"
+      className={cn('select-none', className)}
+      {...props}
+    />
+  )
+}
+
+function ContextMenuContent({
+  className,
+  align = 'start',
+  alignOffset = 4,
+  side = 'right',
+  sideOffset = 0,
+  ...props
+}: ContextMenuPrimitive.Popup.Props &
+  Pick<
+    ContextMenuPrimitive.Positioner.Props,
+    'align' | 'alignOffset' | 'side' | 'sideOffset'
+  >) {
+  return (
+    <ContextMenuPrimitive.Portal>
+      <ContextMenuPrimitive.Positioner
+        className="isolate z-50 outline-none"
+        align={align}
+        alignOffset={alignOffset}
+        side={side}
+        sideOffset={sideOffset}
+      >
+        <ContextMenuPrimitive.Popup
+          data-slot="context-menu-content"
+          className={cn(
+            'z-50 max-h-(--available-height) min-w-36 origin-(--transform-origin) overflow-x-hidden overflow-y-auto rounded-lg bg-popover p-1 text-popover-foreground shadow-md ring-1 ring-foreground/10 duration-100 outline-none data-[side=bottom]:slide-in-from-top-2 data-[side=inline-end]:slide-in-from-left-2 data-[side=inline-start]:slide-in-from-right-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95',
+            className,
+          )}
+          {...props}
+        />
+      </ContextMenuPrimitive.Positioner>
+    </ContextMenuPrimitive.Portal>
+  )
+}
+
+function ContextMenuGroup({ ...props }: ContextMenuPrimitive.Group.Props) {
+  return (
+    <ContextMenuPrimitive.Group data-slot="context-menu-group" {...props} />
+  )
+}
+
+function ContextMenuLabel({
+  className,
+  inset,
+  ...props
+}: ContextMenuPrimitive.GroupLabel.Props & {
+  inset?: boolean
+}) {
+  return (
+    <ContextMenuPrimitive.GroupLabel
+      data-slot="context-menu-label"
+      data-inset={inset}
+      className={cn(
+        'px-1.5 py-1 text-xs font-medium text-muted-foreground data-inset:pl-7',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+function ContextMenuItem({
+  className,
+  inset,
+  variant = 'default',
+  ...props
+}: ContextMenuPrimitive.Item.Props & {
+  inset?: boolean
+  variant?: 'default' | 'destructive'
+}) {
+  return (
+    <ContextMenuPrimitive.Item
+      data-slot="context-menu-item"
+      data-inset={inset}
+      data-variant={variant}
+      className={cn(
+        "group/context-menu-item relative flex cursor-default items-center gap-1.5 rounded-md px-1.5 py-1 text-sm outline-hidden select-none focus:bg-accent focus:text-accent-foreground data-inset:pl-7 data-[variant=destructive]:text-destructive data-[variant=destructive]:focus:bg-destructive/10 data-[variant=destructive]:focus:text-destructive dark:data-[variant=destructive]:focus:bg-destructive/20 data-disabled:pointer-events-none data-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4 focus:*:[svg]:text-accent-foreground data-[variant=destructive]:*:[svg]:text-destructive",
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+function ContextMenuSub({ ...props }: ContextMenuPrimitive.SubmenuRoot.Props) {
+  return (
+    <ContextMenuPrimitive.SubmenuRoot data-slot="context-menu-sub" {...props} />
+  )
+}
+
+function ContextMenuSubTrigger({
+  className,
+  inset,
+  children,
+  ...props
+}: ContextMenuPrimitive.SubmenuTrigger.Props & {
+  inset?: boolean
+}) {
+  return (
+    <ContextMenuPrimitive.SubmenuTrigger
+      data-slot="context-menu-sub-trigger"
+      data-inset={inset}
+      className={cn(
+        "flex cursor-default items-center gap-1.5 rounded-md px-1.5 py-1 text-sm outline-hidden select-none focus:bg-accent focus:text-accent-foreground data-inset:pl-7 data-open:bg-accent data-open:text-accent-foreground [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        className,
+      )}
+      {...props}
+    >
+      {children}
+      <ChevronRightIcon className="ml-auto" />
+    </ContextMenuPrimitive.SubmenuTrigger>
+  )
+}
+
+function ContextMenuSubContent({
+  ...props
+}: React.ComponentProps<typeof ContextMenuContent>) {
+  return (
+    <ContextMenuContent
+      data-slot="context-menu-sub-content"
+      className="shadow-lg"
+      side="right"
+      {...props}
+    />
+  )
+}
+
+function ContextMenuCheckboxItem({
+  className,
+  children,
+  checked,
+  inset,
+  ...props
+}: ContextMenuPrimitive.CheckboxItem.Props & {
+  inset?: boolean
+}) {
+  return (
+    <ContextMenuPrimitive.CheckboxItem
+      data-slot="context-menu-checkbox-item"
+      data-inset={inset}
+      className={cn(
+        "relative flex cursor-default items-center gap-1.5 rounded-md py-1 pr-8 pl-1.5 text-sm outline-hidden select-none focus:bg-accent focus:text-accent-foreground data-inset:pl-7 data-disabled:pointer-events-none data-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        className,
+      )}
+      checked={checked}
+      {...props}
+    >
+      <span className="pointer-events-none absolute right-2">
+        <ContextMenuPrimitive.CheckboxItemIndicator>
+          <CheckIcon />
+        </ContextMenuPrimitive.CheckboxItemIndicator>
+      </span>
+      {children}
+    </ContextMenuPrimitive.CheckboxItem>
+  )
+}
+
+function ContextMenuRadioGroup({
+  ...props
+}: ContextMenuPrimitive.RadioGroup.Props) {
+  return (
+    <ContextMenuPrimitive.RadioGroup
+      data-slot="context-menu-radio-group"
+      {...props}
+    />
+  )
+}
+
+function ContextMenuRadioItem({
+  className,
+  children,
+  inset,
+  ...props
+}: ContextMenuPrimitive.RadioItem.Props & {
+  inset?: boolean
+}) {
+  return (
+    <ContextMenuPrimitive.RadioItem
+      data-slot="context-menu-radio-item"
+      data-inset={inset}
+      className={cn(
+        "relative flex cursor-default items-center gap-1.5 rounded-md py-1 pr-8 pl-1.5 text-sm outline-hidden select-none focus:bg-accent focus:text-accent-foreground data-inset:pl-7 data-disabled:pointer-events-none data-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        className,
+      )}
+      {...props}
+    >
+      <span className="pointer-events-none absolute right-2">
+        <ContextMenuPrimitive.RadioItemIndicator>
+          <CheckIcon />
+        </ContextMenuPrimitive.RadioItemIndicator>
+      </span>
+      {children}
+    </ContextMenuPrimitive.RadioItem>
+  )
+}
+
+function ContextMenuSeparator({
+  className,
+  ...props
+}: ContextMenuPrimitive.Separator.Props) {
+  return (
+    <ContextMenuPrimitive.Separator
+      data-slot="context-menu-separator"
+      className={cn('-mx-1 my-1 h-px bg-border', className)}
+      {...props}
+    />
+  )
+}
+
+function ContextMenuShortcut({
+  className,
+  ...props
+}: React.ComponentProps<'span'>) {
+  return (
+    <span
+      data-slot="context-menu-shortcut"
+      className={cn(
+        'ml-auto text-xs tracking-widest text-muted-foreground group-focus/context-menu-item:text-accent-foreground',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+export {
+  ContextMenu,
+  ContextMenuTrigger,
+  ContextMenuContent,
+  ContextMenuItem,
+  ContextMenuCheckboxItem,
+  ContextMenuRadioItem,
+  ContextMenuLabel,
+  ContextMenuSeparator,
+  ContextMenuShortcut,
+  ContextMenuGroup,
+  ContextMenuPortal,
+  ContextMenuSub,
+  ContextMenuSubContent,
+  ContextMenuSubTrigger,
+  ContextMenuRadioGroup,
+}
diff --git a/examples/react/calendar/src/components/ui/dialog.tsx b/examples/react/calendar/src/components/ui/dialog.tsx
new file mode 100644
index 00000000..f160efd2
--- /dev/null
+++ b/examples/react/calendar/src/components/ui/dialog.tsx
@@ -0,0 +1,157 @@
+import * as React from 'react'
+import { Dialog as DialogPrimitive } from '@base-ui/react/dialog'
+
+import { cn } from '@/lib/utils'
+import { Button } from '@/components/ui/button'
+import { XIcon } from 'lucide-react'
+
+function Dialog({ ...props }: DialogPrimitive.Root.Props) {
+  return <DialogPrimitive.Root data-slot="dialog" {...props} />
+}
+
+function DialogTrigger({ ...props }: DialogPrimitive.Trigger.Props) {
+  return <DialogPrimitive.Trigger data-slot="dialog-trigger" {...props} />
+}
+
+function DialogPortal({ ...props }: DialogPrimitive.Portal.Props) {
+  return <DialogPrimitive.Portal data-slot="dialog-portal" {...props} />
+}
+
+function DialogClose({ ...props }: DialogPrimitive.Close.Props) {
+  return <DialogPrimitive.Close data-slot="dialog-close" {...props} />
+}
+
+function DialogOverlay({
+  className,
+  ...props
+}: DialogPrimitive.Backdrop.Props) {
+  return (
+    <DialogPrimitive.Backdrop
+      data-slot="dialog-overlay"
+      className={cn(
+        'fixed inset-0 isolate z-50 bg-black/10 duration-100 supports-backdrop-filter:backdrop-blur-xs data-open:animate-in data-open:fade-in-0 data-closed:animate-out data-closed:fade-out-0',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+function DialogContent({
+  className,
+  children,
+  showCloseButton = true,
+  ...props
+}: DialogPrimitive.Popup.Props & {
+  showCloseButton?: boolean
+}) {
+  return (
+    <DialogPortal>
+      <DialogOverlay />
+      <DialogPrimitive.Popup
+        data-slot="dialog-content"
+        className={cn(
+          'fixed top-1/2 left-1/2 z-50 grid w-full max-w-[calc(100%-2rem)] -translate-x-1/2 -translate-y-1/2 gap-4 rounded-xl bg-popover p-4 text-sm text-popover-foreground ring-1 ring-foreground/10 duration-100 outline-none sm:max-w-sm data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95',
+          className,
+        )}
+        {...props}
+      >
+        {children}
+        {showCloseButton && (
+          <DialogPrimitive.Close
+            data-slot="dialog-close"
+            render={
+              <Button
+                variant="ghost"
+                className="absolute top-2 right-2"
+                size="icon-sm"
+              />
+            }
+          >
+            <XIcon />
+            <span className="sr-only">Close</span>
+          </DialogPrimitive.Close>
+        )}
+      </DialogPrimitive.Popup>
+    </DialogPortal>
+  )
+}
+
+function DialogHeader({ className, ...props }: React.ComponentProps<'div'>) {
+  return (
+    <div
+      data-slot="dialog-header"
+      className={cn('flex flex-col gap-2', className)}
+      {...props}
+    />
+  )
+}
+
+function DialogFooter({
+  className,
+  showCloseButton = false,
+  children,
+  ...props
+}: React.ComponentProps<'div'> & {
+  showCloseButton?: boolean
+}) {
+  return (
+    <div
+      data-slot="dialog-footer"
+      className={cn(
+        '-mx-4 -mb-4 flex flex-col-reverse gap-2 rounded-b-xl border-t bg-muted/50 p-4 sm:flex-row sm:justify-end',
+        className,
+      )}
+      {...props}
+    >
+      {children}
+      {showCloseButton && (
+        <DialogPrimitive.Close render={<Button variant="outline" />}>
+          Close
+        </DialogPrimitive.Close>
+      )}
+    </div>
+  )
+}
+
+function DialogTitle({ className, ...props }: DialogPrimitive.Title.Props) {
+  return (
+    <DialogPrimitive.Title
+      data-slot="dialog-title"
+      className={cn(
+        'font-heading text-base leading-none font-medium',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+function DialogDescription({
+  className,
+  ...props
+}: DialogPrimitive.Description.Props) {
+  return (
+    <DialogPrimitive.Description
+      data-slot="dialog-description"
+      className={cn(
+        'text-sm text-muted-foreground *:[a]:underline *:[a]:underline-offset-3 *:[a]:hover:text-foreground',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+export {
+  Dialog,
+  DialogClose,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogOverlay,
+  DialogPortal,
+  DialogTitle,
+  DialogTrigger,
+}
diff --git a/examples/react/calendar/src/components/ui/input.tsx b/examples/react/calendar/src/components/ui/input.tsx
new file mode 100644
index 00000000..9def7819
--- /dev/null
+++ b/examples/react/calendar/src/components/ui/input.tsx
@@ -0,0 +1,20 @@
+import * as React from 'react'
+import { Input as InputPrimitive } from '@base-ui/react/input'
+
+import { cn } from '@/lib/utils'
+
+function Input({ className, type, ...props }: React.ComponentProps<'input'>) {
+  return (
+    <InputPrimitive
+      type={type}
+      data-slot="input"
+      className={cn(
+        'h-8 w-full min-w-0 rounded-lg border border-input bg-transparent px-2.5 py-1 text-base transition-colors outline-none file:inline-flex file:h-6 file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50 disabled:pointer-events-none disabled:cursor-not-allowed disabled:bg-input/50 disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-3 aria-invalid:ring-destructive/20 md:text-sm dark:bg-input/30 dark:disabled:bg-input/80 dark:aria-invalid:border-destructive/50 dark:aria-invalid:ring-destructive/40',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Input }
diff --git a/examples/react/calendar/src/components/ui/label.tsx b/examples/react/calendar/src/components/ui/label.tsx
new file mode 100644
index 00000000..9c50830b
--- /dev/null
+++ b/examples/react/calendar/src/components/ui/label.tsx
@@ -0,0 +1,20 @@
+'use client'
+
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+function Label({ className, ...props }: React.ComponentProps<'label'>) {
+  return (
+    <label
+      data-slot="label"
+      className={cn(
+        'flex items-center gap-2 text-sm leading-none font-medium select-none group-data-[disabled=true]:pointer-events-none group-data-[disabled=true]:opacity-50 peer-disabled:cursor-not-allowed peer-disabled:opacity-50',
+        className,
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Label }
diff --git a/examples/react/calendar/src/components/ui/scroll-area.tsx b/examples/react/calendar/src/components/ui/scroll-area.tsx
new file mode 100644
index 00000000..27c3b8a1
--- /dev/null
+++ b/examples/react/calendar/src/components/ui/scroll-area.tsx
@@ -0,0 +1,60 @@
+import * as React from 'react'
+import { ScrollArea as ScrollAreaPrimitive } from '@base-ui/react/scroll-area'
+
+import { cn } from '@/lib/utils'
+
+interface ScrollAreaProps extends ScrollAreaPrimitive.Root.Props {
+  viewportRef?: React.Ref<HTMLDivElement>
+}
+
+function ScrollArea({
+  className,
+  children,
+  viewportRef,
+  ...props
+}: ScrollAreaProps) {
+  return (
+    <ScrollAreaPrimitive.Root
+      data-slot="scroll-area"
+      className={cn('relative', className)}
+      {...props}
+    >
+      <ScrollAreaPrimitive.Viewport
+        ref={viewportRef}
+        data-slot="scroll-area-viewport"
+        className="size-full rounded-[inherit] transition-[color,box-shadow] outline-none focus-visible:ring-[3px] focus-visible:ring-ring/50 focus-visible:outline-1"
+      >
+        {children}
+      </ScrollAreaPrimitive.Viewport>
+      <ScrollBar />
+      <ScrollBar orientation="horizontal" />
+      <ScrollAreaPrimitive.Corner />
+    </ScrollAreaPrimitive.Root>
+  )
+}
+
+function ScrollBar({
+  className,
+  orientation = 'vertical',
+  ...props
+}: ScrollAreaPrimitive.Scrollbar.Props) {
+  return (
+    <ScrollAreaPrimitive.Scrollbar
+      data-slot="scroll-area-scrollbar"
+      data-orientation={orientation}
+      orientation={orientation}
+      className={cn(
+        'flex touch-none p-px transition-colors select-none data-[orientation=horizontal]:h-2.5 data-[orientation=horizontal]:flex-col data-[orientation=horizontal]:border-t data-[orientation=horizontal]:border-t-transparent data-[orientation=vertical]:h-full data-[orientation=vertical]:w-2.5 data-[orientation=vertical]:border-l data-[orientation=vertical]:border-l-transparent',
+        className,
+      )}
+      {...props}
+    >
+      <ScrollAreaPrimitive.Thumb
+        data-slot="scroll-area-thumb"
+        className="relative flex-1 rounded-full bg-neutral-400"
+      />
+    </ScrollAreaPrimitive.Scrollbar>
+  )
+}
+
+export { ScrollArea, ScrollBar }
diff --git a/examples/react/calendar/src/components/ui/select.tsx b/examples/react/calendar/src/components/ui/select.tsx
new file mode 100644
index 00000000..c4ed0cb3
--- /dev/null
+++ b/examples/react/calendar/src/components/ui/select.tsx
@@ -0,0 +1,200 @@
+import * as React from 'react'
+import { Select as SelectPrimitive } from '@base-ui/react/select'
+
+import { CheckIcon, ChevronDownIcon, ChevronUpIcon } from 'lucide-react'
+import { cn } from '@/lib/utils'
+
+const Select = SelectPrimitive.Root
+
+function SelectGroup({ className, ...props }: SelectPrimitive.Group.Props) {
+  return (
+    <SelectPrimitive.Group
+      data-slot="select-group"
+      className={cn('scroll-my-1 p-1', className)}
+      {...props}
+    />
+  )
+}
+
+function SelectValue({ className, ...props }: SelectPrimitive.Value.Props) {
+  return (
+    <SelectPrimitive.Value
+      data-slot="select-value"
+      className={cn('flex flex-1 text-left', className)}
+      {...props}
+    />
+  )
+}
+
+function SelectTrigger({
+  className,
+  size = 'default',
+  children,
+  ...props
+}: SelectPrimitive.Trigger.Props & {
+  size?: 'sm' | 'default'
+}) {
+  return (
+    <SelectPrimitive.Trigger
+      data-slot="select-trigger"
+      data-size={size}
+      className={cn(
+        "flex w-fit items-center justify-between gap-1.5 rounded-lg border border-input bg-transparent py-2 pr-2 pl-2.5 text-sm whitespace-nowrap transition-colors outline-none select-none focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50 disabled:cursor-not-allowed disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-3 aria-invalid:ring-destructive/20 data-placeholder:text-muted-foreground data-[size=default]:h-8 data-[size=sm]:h-7 data-[size=sm]:rounded-[min(var(--radius-md),10px)] *:data-[slot=select-value]:line-clamp-1 *:data-[slot=select-value]:flex *:data-[slot=select-value]:items-center *:data-[slot=select-value]:gap-1.5 dark:bg-input/30 dark:hover:bg-input/50 dark:aria-invalid:border-destructive/50 dark:aria-invalid:ring-destructive/40 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        className,
+      )}
+      {...props}
+    >
+      {children}
+      <SelectPrimitive.Icon
+        render={
+          <ChevronDownIcon className="pointer-events-none size-4 text-muted-foreground" />
+        }
+      />
+    </SelectPrimitive.Trigger>
+  )
+}
+
+function SelectContent({
+  className,
+  children,
+  side = 'bottom',
+  sideOffset = 4,
+  align = 'center',
+  alignOffset = 0,
+  alignItemWithTrigger = true,
+  ...props
+}: SelectPrimitive.Popup.Props &
+  Pick<
+    SelectPrimitive.Positioner.Props,
+    'align' | 'alignOffset' | 'side' | 'sideOffset' | 'alignItemWithTrigger'
+  >) {
+  return (
+    <SelectPrimitive.Portal>
+      <SelectPrimitive.Positioner
+        side={side}
+        sideOffset={sideOffset}
+        align={align}
+        alignOffset={alignOffset}
+        alignItemWithTrigger={alignItemWithTrigger}
+        className="isolate z-50"
+      >
+        <SelectPrimitive.Popup
+          data-slot="select-content"
+          data-align-trigger={alignItemWithTrigger}
+          className={cn(
+            'relative isolate z-50 max-h-(--available-height) w-(--anchor-width) min-w-36 origin-(--transform-origin) overflow-x-hidden overflow-y-auto rounded-lg bg-popover text-popover-foreground shadow-md ring-1 ring-foreground/10 duration-100 data-[align-trigger=true]:animate-none data-[side=bottom]:slide-in-from-top-2 data-[side=inline-end]:slide-in-from-left-2 data-[side=inline-start]:slide-in-from-right-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95',
+            className,
+          )}
+          {...props}
+        >
+          <SelectScrollUpButton />
+          <SelectPrimitive.List>{children}</SelectPrimitive.List>
+          <SelectScrollDownButton />
+        </SelectPrimitive.Popup>
+      </SelectPrimitive.Positioner>
+    </SelectPrimitive.Portal>
+  )
+}
+
+function SelectLabel({
+  className,
+  ...props
+}: SelectPrimitive.GroupLabel.Props) {
+  return (
+    <SelectPrimitive.GroupLabel
+      data-slot="select-label"
+      className={cn('px-1.5 py-1 text-xs text-muted-foreground', className)}
+      {...props}
+    />
+  )
+}
+
+function SelectItem({
+  className,
+  children,
+  ...props
+}: SelectPrimitive.Item.Props) {
+  return (
+    <SelectPrimitive.Item
+      data-slot="select-item"
+      className={cn(
+        "relative flex w-full cursor-default items-center gap-1.5 rounded-md py-1 pr-8 pl-1.5 text-sm outline-hidden select-none focus:bg-accent focus:text-accent-foreground not-data-[variant=destructive]:focus:**:text-accent-foreground data-disabled:pointer-events-none data-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4 *:[span]:last:flex *:[span]:last:items-center *:[span]:last:gap-2",
+        className,
+      )}
+      {...props}
+    >
+      <SelectPrimitive.ItemText className="flex flex-1 shrink-0 gap-2 whitespace-nowrap">
+        {children}
+      </SelectPrimitive.ItemText>
+      <SelectPrimitive.ItemIndicator
+        render={
+          <span className="pointer-events-none absolute right-2 flex size-4 items-center justify-center" />
+        }
+      >
+        <CheckIcon className="pointer-events-none" />
+      </SelectPrimitive.ItemIndicator>
+    </SelectPrimitive.Item>
+  )
+}
+
+function SelectSeparator({
+  className,
+  ...props
+}: SelectPrimitive.Separator.Props) {
+  return (
+    <SelectPrimitive.Separator
+      data-slot="select-separator"
+      className={cn('pointer-events-none -mx-1 my-1 h-px bg-border', className)}
+      {...props}
+    />
+  )
+}
+
+function SelectScrollUpButton({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.ScrollUpArrow>) {
+  return (
+    <SelectPrimitive.ScrollUpArrow
+      data-slot="select-scroll-up-button"
+      className={cn(
+        "top-0 z-10 flex w-full cursor-default items-center justify-center bg-popover py-1 [&_svg:not([class*='size-'])]:size-4",
+        className,
+      )}
+      {...props}
+    >
+      <ChevronUpIcon />
+    </SelectPrimitive.ScrollUpArrow>
+  )
+}
+
+function SelectScrollDownButton({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.ScrollDownArrow>) {
+  return (
+    <SelectPrimitive.ScrollDownArrow
+      data-slot="select-scroll-down-button"
+      className={cn(
+        "bottom-0 z-10 flex w-full cursor-default items-center justify-center bg-popover py-1 [&_svg:not([class*='size-'])]:size-4",
+        className,
+      )}
+      {...props}
+    >
+      <ChevronDownIcon />
+    </SelectPrimitive.ScrollDownArrow>
+  )
+}
+
+export {
+  Select,
+  SelectContent,
+  SelectGroup,
+  SelectItem,
+  SelectLabel,
+  SelectScrollDownButton,
+  SelectScrollUpButton,
+  SelectSeparator,
+  SelectTrigger,
+  SelectValue,
+}
diff --git a/examples/react/calendar/src/index.css b/examples/react/calendar/src/index.css
new file mode 100644
index 00000000..93d6f3f9
--- /dev/null
+++ b/examples/react/calendar/src/index.css
@@ -0,0 +1,98 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer base {
+  :root {
+    --background: 0 0% 0%;
+    --foreground: 0 0% 87%;
+
+    --card: 0 0% 20.5%;
+    --card-foreground: 0 0% 87%;
+
+    --popover: 0 0% 20.5%;
+    --popover-foreground: 0 0% 87%;
+
+    --primary: 0 0% 87%;
+    --primary-foreground: 0 0% 20.5%;
+
+    --secondary: 0 0% 26.9%;
+    --secondary-foreground: 0 0% 87%;
+
+    --muted: 0 0% 26.9%;
+    --muted-foreground: 0 0% 70.8%;
+
+    --accent: 0 0% 26.9%;
+    --accent-foreground: 0 0% 87%;
+
+    --destructive: 0 84.2% 60.2%;
+    --destructive-foreground: 0 0% 98%;
+
+    --border: 0 0% 100% / 10%;
+    --input: 0 0% 100% / 15%;
+    --ring: 0 0% 55.6%;
+
+    --radius: 0.625rem;
+
+    --font-sans: 'Geist Variable', sans-serif;
+    --font-heading: var(--font-sans);
+  }
+
+  * {
+    @apply border-border;
+  }
+
+  body {
+    background-color: hsl(var(--background));
+    color: hsl(var(--foreground));
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+    font-family: var(--font-sans), system-ui, sans-serif;
+  }
+
+  html {
+    font-family: var(--font-sans), system-ui, sans-serif;
+  }
+}
+
+@layer utilities {
+  .bg-background {
+    background-color: hsl(var(--background));
+  }
+  .text-foreground {
+    color: hsl(var(--foreground));
+  }
+  .bg-card {
+    background-color: hsl(var(--card));
+  }
+  .text-card-foreground {
+    color: hsl(var(--card-foreground));
+  }
+  .bg-primary {
+    background-color: hsl(var(--primary));
+  }
+  .text-primary-foreground {
+    color: hsl(var(--primary-foreground));
+  }
+  .bg-secondary {
+    background-color: hsl(var(--secondary));
+  }
+  .text-secondary-foreground {
+    color: hsl(var(--secondary-foreground));
+  }
+  .text-muted-foreground {
+    color: hsl(var(--muted-foreground));
+  }
+  .border-border {
+    border-color: hsl(var(--border));
+  }
+  .bg-input {
+    background-color: hsl(var(--input));
+  }
+  .ring-ring {
+    --tw-ring-color: hsl(var(--ring));
+  }
+  .outline-ring {
+    outline-color: hsl(var(--ring));
+  }
+}
diff --git a/examples/react/calendar/src/index.tsx b/examples/react/calendar/src/index.tsx
new file mode 100644
index 00000000..7b58e508
--- /dev/null
+++ b/examples/react/calendar/src/index.tsx
@@ -0,0 +1,2017 @@
+import {
+  calculateGhostPreviewStyle,
+  calculateSegmentResizePreview,
+  formatEventTimeRange,
+  useCalendar,
+} from '@tanstack/react-time'
+import ReactDOM from 'react-dom/client'
+import { useEffect, useLayoutEffect, useMemo, useRef, useState } from 'react'
+import { TanStackDevtools } from '@tanstack/react-devtools'
+import { timeDevtoolsPlugin } from '@tanstack/react-time-devtools'
+import { useInfiniteScroll } from './lib/useInfiniteScroll'
+import type {
+  Day,
+  Event,
+  EventDateTimeInput,
+  RecurrenceEditScope,
+  RecurrenceFrequency,
+  RecurrenceRule,
+  ResizeError,
+  Resource,
+} from '@tanstack/time'
+import { Button } from '@/components/ui/button'
+import {
+  Dialog,
+  DialogContent,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import { Badge } from '@/components/ui/badge'
+import {
+  ContextMenu,
+  ContextMenuContent,
+  ContextMenuItem,
+  ContextMenuSeparator,
+  ContextMenuTrigger,
+} from '@/components/ui/context-menu'
+import { ScrollArea } from '@/components/ui/scroll-area'
+
+import './index.css'
+
+function formatDateToISO(date: Date): string {
+  const year = date.getFullYear()
+  const month = String(date.getMonth() + 1).padStart(2, '0')
+  const day = String(date.getDate()).padStart(2, '0')
+  return `${year}-${month}-${day}`
+}
+
+function padTimePart(n: number): string {
+  return String(n).padStart(2, '0')
+}
+
+function workWeekMonday(): Date {
+  const today = new Date()
+  const dow = today.getDay()
+  const monday = new Date(today)
+
+  if (dow === 0 || dow === 6) {
+    monday.setDate(today.getDate() + (dow === 0 ? 1 : 2))
+  } else {
+    monday.setDate(today.getDate() + (1 - dow))
+  }
+  monday.setHours(0, 0, 0, 0)
+  return monday
+}
+
+function weekdayAt(isoWeekday: 1 | 2 | 3 | 4 | 5): Date {
+  const monday = workWeekMonday()
+  const d = new Date(monday)
+  d.setDate(monday.getDate() + isoWeekday - 1)
+  return d
+}
+
+function dateTimeOnWeekday(
+  isoWeekday: 1 | 2 | 3 | 4 | 5,
+  hour: number,
+  minute: number,
+): string {
+  const d = weekdayAt(isoWeekday)
+  d.setHours(hour, minute, 0, 0)
+  return `${formatDateToISO(d)}T${padTimePart(hour)}:${padTimePart(minute)}:00`
+}
+
+function getResourceId(resource: Resource | string): string {
+  return typeof resource === 'string' ? resource : resource.id
+}
+
+const sampleResources: Array<Resource> = [
+  {
+    id: 'room-a',
+    label: 'Room A',
+    capacity: [4],
+    availability: [
+      {
+        weekdays: [1, 2, 3, 4, 5],
+        startTime: '00:00',
+        endTime: '24:00',
+      },
+    ],
+  },
+  {
+    id: 'room-b',
+    label: 'Room B',
+    capacity: [2],
+    availability: [
+      {
+        weekdays: [1, 2, 3, 4, 5],
+        startTime: '00:00',
+        endTime: '24:00',
+      },
+    ],
+  },
+]
+
+/*
+  Capacity + consumption demo:
+  - Room A has capacity 4, Room B has capacity 2.
+  - Overlapping events intentionally consume different amounts.
+  - Try resizing one event to overlap others to trigger capacity conflicts.
+*/
+function getSampleEvents(): Array<Event<Resource>> {
+  return [
+    {
+      id: '1',
+      title: 'Team Meeting (A:2)',
+      start: dateTimeOnWeekday(2, 12, 0),
+      end: dateTimeOnWeekday(2, 13, 0),
+      resources: [sampleResources[0]],
+      consumption: [2],
+    },
+    {
+      id: '2',
+      title: 'Project Review (A:2)',
+      start: dateTimeOnWeekday(3, 14, 0),
+      end: dateTimeOnWeekday(3, 15, 30),
+      resources: [sampleResources[0]],
+      consumption: [2],
+    },
+    {
+      id: '3',
+      title: 'Workshop (B:1)',
+      start: dateTimeOnWeekday(4, 12, 0),
+      end: dateTimeOnWeekday(4, 16, 30),
+      resources: [sampleResources[1]],
+      consumption: [1],
+    },
+    {
+      id: '4',
+      title: 'Capacity Probe (A:1)',
+      start: dateTimeOnWeekday(5, 12, 0),
+      end: dateTimeOnWeekday(5, 13, 0),
+      resources: [sampleResources[0]],
+      consumption: [1],
+    },
+    {
+      id: '5',
+      title: 'Focus Block (A:2)',
+      start: dateTimeOnWeekday(5, 12, 30),
+      end: dateTimeOnWeekday(5, 14, 30),
+      resources: [sampleResources[0]],
+      consumption: [2],
+    },
+    {
+      id: '6',
+      title: 'Interview (B:1)',
+      start: dateTimeOnWeekday(2, 12, 30),
+      end: dateTimeOnWeekday(2, 14, 0),
+      resources: [sampleResources[1]],
+      consumption: [1],
+    },
+    {
+      id: 'r-standup',
+      title: '☀ Daily Stand-up (A:1)',
+      start: dateTimeOnWeekday(1, 9, 0),
+      end: dateTimeOnWeekday(1, 9, 15),
+      resources: [sampleResources[0]],
+      consumption: [1],
+      recurrence: {
+        frequency: 'daily',
+        interval: 1,
+        byWeekday: undefined,
+        exDates: [dateTimeOnWeekday(3, 9, 0)],
+        overrides: [
+          {
+            originalStart: dateTimeOnWeekday(2, 9, 0),
+            start: dateTimeOnWeekday(2, 15, 0),
+            end: dateTimeOnWeekday(2, 15, 15),
+            title: '☀ Daily Stand-up moved (A:1)',
+          },
+        ],
+      },
+    },
+    {
+      id: 'r-sync',
+      title: '🔄 Weekly Sync (B:1)',
+      start: dateTimeOnWeekday(1, 10, 0),
+      end: dateTimeOnWeekday(1, 10, 30),
+      resources: [sampleResources[1]],
+      consumption: [1],
+      recurrence: {
+        frequency: 'weekly',
+        interval: 1,
+        byWeekday: [1],
+        count: 6,
+      },
+    },
+    {
+      id: 'r-report',
+      title: '📊 Monthly Report (A:1)',
+      start: dateTimeOnWeekday(1, 14, 0),
+      end: dateTimeOnWeekday(1, 15, 0),
+      resources: [sampleResources[0]],
+      consumption: [1],
+      recurrence: {
+        frequency: 'monthly',
+        interval: 1,
+      },
+    },
+    {
+      id: 'ad-holiday',
+      title: '🎉 Company Holiday',
+      start: `${formatDateToISO(weekdayAt(3))}T00:00:00`,
+      end: `${formatDateToISO(weekdayAt(3))}T23:59:59`,
+      allDay: true,
+    },
+    {
+      id: 'ad-conf',
+      title: '🏢 Offsite Conference',
+      start: `${formatDateToISO(weekdayAt(4))}T00:00:00`,
+      end: `${formatDateToISO(weekdayAt(5))}T23:59:59`,
+      allDay: true,
+    },
+  ]
+}
+
+const MOCK_DB = getSampleEvents()
+
+interface EventFormData {
+  title: string
+  startDate: string
+  startTime: string
+  endDate: string
+  endTime: string
+  resourceId: string
+  consumption: number
+  recurrenceFrequency: RecurrenceFrequency | 'none'
+  recurrenceUntil: string
+  recurrenceEditScope: RecurrenceEditScope
+  allDay: boolean
+}
+
+const emptyFormData: EventFormData = {
+  title: '',
+  startDate: formatDateToISO(new Date()),
+  startTime: '09:00',
+  endDate: formatDateToISO(new Date()),
+  endTime: '10:00',
+  resourceId: sampleResources[0]?.id ?? '',
+  consumption: 1,
+  recurrenceFrequency: 'none',
+  recurrenceUntil: '',
+  recurrenceEditScope: 'this',
+  allDay: false,
+}
+
+function EventModal({
+  isOpen,
+  onClose,
+  onSave,
+  onDelete,
+  initialData,
+  isRecurring,
+  mode,
+  isSaving,
+  resources,
+}: {
+  isOpen: boolean
+  onClose: () => void
+  onSave: (data: EventFormData) => Promise<void>
+  onDelete?: (data: EventFormData) => void
+  initialData: EventFormData
+  mode: 'add' | 'edit'
+  isRecurring?: boolean
+  isSaving?: boolean
+  resources: Array<Resource>
+}) {
+  const [formData, setFormData] = useState<EventFormData>(initialData)
+
+  useEffect(() => {
+    setFormData(initialData)
+  }, [initialData])
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault()
+    try {
+      await onSave(formData)
+    } catch {
+      return
+    }
+    onClose()
+  }
+
+  const recurrencyOptions: Array<{
+    value: RecurrenceFrequency | 'none'
+    label: string
+  }> = [
+    { value: 'none', label: 'Does not repeat' },
+    { value: 'daily', label: 'Daily' },
+    { value: 'weekly', label: 'Weekly' },
+    { value: 'monthly', label: 'Monthly' },
+    { value: 'yearly', label: 'Yearly' },
+  ]
+
+  const recurrenceEditScopeOptions: Array<{
+    value: RecurrenceEditScope
+    label: string
+  }> = [
+    { value: 'this', label: 'This event only' },
+    { value: 'thisAndFollowing', label: 'This and following events' },
+    { value: 'all', label: 'All events in series' },
+  ]
+
+  return (
+    <Dialog open={isOpen} onOpenChange={(open) => !open && onClose()}>
+      <DialogContent className="sm:max-w-md bg-card border-border">
+        <DialogHeader>
+          <DialogTitle>
+            {mode === 'add' ? 'Add Event' : 'Edit Event'}
+          </DialogTitle>
+        </DialogHeader>
+        <form onSubmit={handleSubmit} className="space-y-4 mt-4">
+          <div className="space-y-2">
+            <Label htmlFor="title">Title</Label>
+            <Input
+              id="title"
+              type="text"
+              value={formData.title}
+              onChange={(e) =>
+                setFormData({ ...formData, title: e.target.value })
+              }
+              placeholder="Event title"
+              required
+            />
+          </div>
+          <div className="flex items-center gap-2">
+            <input
+              id="allDay"
+              type="checkbox"
+              checked={formData.allDay}
+              onChange={(e) =>
+                setFormData({ ...formData, allDay: e.target.checked })
+              }
+              className="h-4 w-4"
+            />
+            <Label htmlFor="allDay" className="cursor-pointer">
+              All-day
+            </Label>
+          </div>
+          <div className="grid grid-cols-2 gap-4">
+            <div className="space-y-2">
+              <Label htmlFor="startDate">Start Date</Label>
+              <Input
+                id="startDate"
+                type="date"
+                value={formData.startDate}
+                onChange={(e) =>
+                  setFormData({ ...formData, startDate: e.target.value })
+                }
+                required
+              />
+            </div>
+            <div className="space-y-2">
+              <Label htmlFor="startTime">Start Time</Label>
+              <Input
+                id="startTime"
+                type="time"
+                value={formData.startTime}
+                onChange={(e) =>
+                  setFormData({ ...formData, startTime: e.target.value })
+                }
+                disabled={formData.allDay}
+                required={!formData.allDay}
+              />
+            </div>
+          </div>
+
+          <div className="grid grid-cols-2 gap-4">
+            <div className="space-y-2">
+              <Label htmlFor="resourceId">Resource</Label>
+              <select
+                id="resourceId"
+                className="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
+                value={formData.resourceId}
+                onChange={(e) =>
+                  setFormData({ ...formData, resourceId: e.target.value })
+                }
+                required
+              >
+                {resources.map((resource) => (
+                  <option key={resource.id} value={resource.id}>
+                    {resource.label}
+                  </option>
+                ))}
+              </select>
+            </div>
+            <div className="space-y-2">
+              <Label htmlFor="consumption">Consumption</Label>
+              <Input
+                id="consumption"
+                type="number"
+                min={1}
+                step={1}
+                value={formData.consumption}
+                onChange={(e) =>
+                  setFormData({
+                    ...formData,
+                    consumption: Math.max(1, Number(e.target.value) || 1),
+                  })
+                }
+                required
+              />
+            </div>
+          </div>
+          <div className="grid grid-cols-2 gap-4">
+            <div className="space-y-2">
+              <Label htmlFor="endDate">End Date</Label>
+              <Input
+                id="endDate"
+                type="date"
+                value={formData.endDate}
+                onChange={(e) =>
+                  setFormData({ ...formData, endDate: e.target.value })
+                }
+                required
+              />
+            </div>
+            <div className="space-y-2">
+              <Label htmlFor="endTime">End Time</Label>
+              <Input
+                id="endTime"
+                type="time"
+                value={formData.endTime}
+                onChange={(e) =>
+                  setFormData({ ...formData, endTime: e.target.value })
+                }
+                disabled={formData.allDay}
+                required={!formData.allDay}
+              />
+            </div>
+          </div>
+
+          {mode === 'edit' && isRecurring && (
+            <div className="space-y-2 rounded-md border border-neutral-800 bg-neutral-950/60 p-3">
+              <Label htmlFor="recurrenceEditScope">Apply changes to</Label>
+              <select
+                id="recurrenceEditScope"
+                className="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
+                value={formData.recurrenceEditScope}
+                onChange={(e) =>
+                  setFormData({
+                    ...formData,
+                    recurrenceEditScope: e.target.value as RecurrenceEditScope,
+                  })
+                }
+              >
+                {recurrenceEditScopeOptions.map((opt) => (
+                  <option key={opt.value} value={opt.value}>
+                    {opt.label}
+                  </option>
+                ))}
+              </select>
+              <p className="text-xs text-neutral-500">
+                Save or Delete uses selected recurring-event scope.
+              </p>
+            </div>
+          )}
+
+          {/* ── Recurrence ───────────────────────────────────────────── */}
+          <div className="space-y-2">
+            <Label htmlFor="recurrenceFrequency">Repeat</Label>
+            <select
+              id="recurrenceFrequency"
+              className="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
+              value={formData.recurrenceFrequency}
+              onChange={(e) =>
+                setFormData({
+                  ...formData,
+                  recurrenceFrequency: e.target.value as
+                    | RecurrenceFrequency
+                    | 'none',
+                })
+              }
+            >
+              {recurrencyOptions.map((opt) => (
+                <option key={opt.value} value={opt.value}>
+                  {opt.label}
+                </option>
+              ))}
+            </select>
+          </div>
+
+          {formData.recurrenceFrequency !== 'none' && (
+            <div className="space-y-2">
+              <Label htmlFor="recurrenceUntil">Repeat until (optional)</Label>
+              <Input
+                id="recurrenceUntil"
+                type="date"
+                value={formData.recurrenceUntil}
+                onChange={(e) =>
+                  setFormData({ ...formData, recurrenceUntil: e.target.value })
+                }
+              />
+            </div>
+          )}
+
+          <div className="flex justify-between pt-4">
+            <div>
+              {mode === 'edit' && onDelete && (
+                <Button
+                  type="button"
+                  variant="destructive"
+                  onClick={() => {
+                    onDelete(formData)
+                    onClose()
+                  }}
+                >
+                  Delete
+                  {isRecurring
+                    ? ` ${formData.recurrenceEditScope === 'this' ? 'this event' : formData.recurrenceEditScope === 'thisAndFollowing' ? 'this and following' : 'series'}`
+                    : ''}
+                </Button>
+              )}
+            </div>
+            <div className="flex gap-2">
+              <Button type="button" variant="outline" onClick={onClose}>
+                Cancel
+              </Button>
+              <Button type="submit" disabled={isSaving}>
+                {isSaving ? 'Saving…' : mode === 'add' ? 'Add' : 'Save'}
+              </Button>
+            </div>
+          </div>
+        </form>
+      </DialogContent>
+    </Dialog>
+  )
+}
+
+interface ResizeHandleProps {
+  edge: 'top' | 'bottom'
+  /**
+   * When the event is too short to host two stacked handles inside it, float
+   * the handle just outside the box (above for top, below for bottom) so the
+   * two handles never overlap and the event stays resizable at any height.
+   */
+  floating?: boolean
+  onMouseDown: (e: React.MouseEvent) => void
+}
+
+function ResizeHandle({ edge, floating, onMouseDown }: ResizeHandleProps) {
+  const edgePosition = floating
+    ? edge === 'top'
+      ? '-top-3'
+      : '-bottom-3'
+    : edge === 'top'
+      ? 'top-0'
+      : 'bottom-0'
+
+  return (
+    <div
+      data-resize-handle
+      className={`absolute left-0 right-0 h-3 cursor-ns-resize z-30 bg-transparent hover:bg-neutral-500/30 pointer-events-auto ${edgePosition}`}
+      onMouseDown={onMouseDown}
+      onClick={(e) => {
+        e.stopPropagation()
+      }}
+      style={{ touchAction: 'none' }}
+    >
+      <div
+        className={`absolute left-1/2 -translate-x-1/2 w-8 h-1 bg-neutral-400 rounded opacity-50 group-hover:opacity-100 transition-opacity ${
+          edge === 'top' ? 'top-1' : 'bottom-1'
+        }`}
+      />
+    </div>
+  )
+}
+
+function ScheduleView({
+  calendar,
+  days,
+  resources,
+  onEventClick,
+  scrollRef,
+  leftSentinelRef,
+  rightSentinelRef,
+  periodDayCount,
+}: {
+  calendar: ReturnType<typeof useCalendar<Resource, Event<Resource>>>
+  days: Array<Day<Resource, Event<Resource>>>
+  resources: Array<Resource>
+  onEventClick: (event: Event<Resource>, scope?: RecurrenceEditScope) => void
+  scrollRef: React.RefObject<HTMLDivElement | null>
+  leftSentinelRef: React.RefObject<HTMLDivElement | null>
+  rightSentinelRef: React.RefObject<HTMLDivElement | null>
+  periodDayCount: number
+}) {
+  const timeSlots = calendar.getTimeSlots()
+  const {
+    resizeState,
+    getResizeHandleProps,
+    getDayColumnProps,
+    getUnavailableRanges,
+  } = calendar
+
+  const maxAllDay = days.reduce((m, d) => Math.max(m, d.allDayEvents.length), 0)
+  const allDayRowHeight = maxAllDay > 0 ? maxAllDay * 24 + 8 : 28
+
+  return (
+    <div className="border border-neutral-800 rounded-lg overflow-hidden bg-black">
+      <div className="border-b border-neutral-800 bg-neutral-950 px-4 py-3">
+        <div className="flex gap-6 flex-wrap">
+          {resources.map((resource, idx) => {
+            const colors = ['#0049af75', '#00af3475']
+            const color = colors[idx % colors.length]
+            return (
+              <div key={resource.id} className="flex items-center gap-2">
+                <div
+                  className="w-4 h-4 rounded-sm"
+                  style={{
+                    backgroundColor: color,
+                    backgroundImage: `repeating-linear-gradient(315deg, ${color} 0, ${color} 1px, transparent 0, transparent 50%)`,
+                  }}
+                />
+                <span className="text-sm text-neutral-300">
+                  {resource.label}
+                </span>
+                {resource.capacity !== undefined && (
+                  <span className="text-xs text-neutral-500">
+                    (Capacity: {resource.capacity})
+                  </span>
+                )}
+              </div>
+            )
+          })}
+        </div>
+      </div>
+      <div className="flex border-t border-neutral-800">
+        <div className="w-20 border-r border-neutral-800 bg-neutral-950">
+          <div className="h-12 border-b border-neutral-800"></div>
+          <div
+            className="border-b border-neutral-800 px-2 py-1 text-[10px] uppercase tracking-wide text-neutral-500 flex items-center"
+            style={{ height: allDayRowHeight }}
+          >
+            all-day
+          </div>
+          {timeSlots.map((slot) => (
+            <div
+              key={`${slot.hour}-${slot.minute}`}
+              className="h-[60px] border-b border-neutral-800/50 px-2 py-1 text-xs text-neutral-500"
+            >
+              {slot.label}
+            </div>
+          ))}
+        </div>
+        {/* Horizontal-scrollable schedule body — sentinels auto-navigate on edge */}
+        <ScrollArea viewportRef={scrollRef} className="flex-1">
+          <div
+            className="grid"
+            style={{
+              gridTemplateColumns: `1px repeat(${days.length}, minmax(0, 1fr)) 1px`,
+              minWidth: `${(days.length / periodDayCount) * 100}%`,
+            }}
+          >
+            <div ref={leftSentinelRef} style={{ width: 1 }} aria-hidden />
+            <div className="contents">
+              {days.map((day) => {
+                const dayDate = `${day.date.year}-${String(day.date.month).padStart(2, '0')}-${String(day.date.day).padStart(2, '0')}`
+                const dayName = new Intl.DateTimeFormat('en-US', {
+                  weekday: 'short',
+                }).format(
+                  new Date(day.date.year, day.date.month - 1, day.date.day),
+                )
+                return (
+                  <div
+                    key={day.date.toString()}
+                    className="border-r border-neutral-800 last:border-r-0"
+                    {...getDayColumnProps(dayDate)}
+                  >
+                    <div className="h-12 border-b border-neutral-800 bg-neutral-950 px-3 py-2 text-center">
+                      <div className="text-sm font-semibold text-neutral-200">
+                        {dayName}
+                      </div>
+                      <div className="text-xs text-neutral-500">
+                        {day.date.day}
+                      </div>
+                    </div>
+                    <div
+                      className="border-b border-neutral-800 bg-neutral-950/60 px-1 py-1 flex flex-col gap-1 overflow-hidden"
+                      style={{ height: allDayRowHeight }}
+                    >
+                      {day.allDayEvents.map((event) => (
+                        <div
+                          key={`ad-${event.id}`}
+                          className="cursor-pointer bg-amber-700/70 hover:bg-amber-600/80 text-amber-50 rounded px-2 text-[11px] font-medium truncate border border-amber-600/40"
+                          style={{ height: 20, lineHeight: '20px' }}
+                          title={event.title}
+                          onClick={() => onEventClick(event)}
+                        >
+                          {event.title}
+                        </div>
+                      ))}
+                    </div>
+                    <div className="relative h-[1440px] bg-neutral-950/30">
+                      {resources.map((resource, resourceIdx) => {
+                        const resourceRanges = getUnavailableRanges(dayDate, {
+                          resourceIds: [resource.id],
+                        })
+                        const colors = ['#0049af75', '#00af3475']
+                        const color = colors[resourceIdx % colors.length]
+
+                        return resourceRanges.map((range, rangeIdx) => (
+                          <div
+                            key={`${resource.id}-${rangeIdx}`}
+                            className="absolute left-0 right-0 pointer-events-none z-0 bg-[length:10px_10px] bg-fixed"
+                            style={{
+                              top: `${range.top}px`,
+                              height: `${range.height}px`,
+                              backgroundImage: `repeating-linear-gradient(315deg, ${color} 0, ${color} 1px, transparent 0, transparent 50%)`,
+                            }}
+                            title={`Unavailable - ${resource.label}`}
+                          />
+                        ))
+                      })}
+                      {day.events.map((event, eventIndex) => {
+                        const eventProps = calendar.getEventProps(event)
+                        const { style, isSplitEvent } = eventProps
+
+                        const segmentInfo = calendar.getEventSegmentInfo(event)
+                        const {
+                          isFirstSegment,
+                          isLastSegment,
+                          originalStart,
+                          originalEnd,
+                        } = segmentInfo
+
+                        const isBeingResized =
+                          resizeState.isResizing &&
+                          resizeState.eventId === event.id
+
+                        const resizePreview =
+                          isBeingResized &&
+                          resizeState.previewStart &&
+                          resizeState.previewEnd
+                            ? calculateSegmentResizePreview({
+                                dayDate,
+                                originalStart,
+                                originalEnd,
+                                previewStart: resizeState.previewStart,
+                                previewEnd: resizeState.previewEnd,
+                              })
+                            : null
+
+                        if (resizePreview?.shouldHide) {
+                          return null
+                        }
+
+                        const displayStyle = resizePreview?.previewStyle
+                          ? { ...style, ...resizePreview.previewStyle }
+                          : style
+
+                        // Events render at their true height (no min-height
+                        // floor). A very short event can't host two stacked
+                        // 12px handles inside it without them overlapping and
+                        // stealing each other's clicks — so for those, float
+                        // the handles just outside the box. Still resizable.
+                        const RESIZE_HANDLE_PX = 12 // ResizeHandle `h-3`
+                        const DAY_COLUMN_HEIGHT_PX = 1440 // the `h-[1440px]` grid
+                        const renderedHeightPx = style?.height
+                          ? (parseFloat(style.height) / 100) *
+                            DAY_COLUMN_HEIGHT_PX
+                          : Infinity
+                        const floatHandles =
+                          renderedHeightPx < RESIZE_HANDLE_PX * 2
+
+                        const showTopHandle = !isSplitEvent || isFirstSegment
+                        const showBottomHandle = !isSplitEvent || isLastSegment
+                        const isActivelyResized =
+                          isBeingResized && resizePreview?.previewStyle !== null
+
+                        const timeRange = formatEventTimeRange(
+                          isBeingResized && resizeState.previewStart
+                            ? resizeState.previewStart
+                            : originalStart,
+                          isBeingResized && resizeState.previewEnd
+                            ? resizeState.previewEnd
+                            : originalEnd,
+                        )
+
+                        return (
+                          <ContextMenu key={`${event.id}-${eventIndex}`}>
+                            <ContextMenuTrigger
+                              className={`group absolute z-10 bg-neutral-800 text-white rounded px-2 py-1 text-xs font-medium transition-colors border border-neutral-700 ${
+                                // Floating handles sit outside the box, so they
+                                // must not be clipped.
+                                floatHandles ? '' : 'overflow-hidden'
+                              } ${
+                                isActivelyResized
+                                  ? 'bg-neutral-700 ring-2 ring-neutral-500 z-20'
+                                  : 'cursor-pointer hover:bg-neutral-700'
+                              }`}
+                              style={displayStyle as React.CSSProperties}
+                              onClick={(e: React.MouseEvent) => {
+                                if (
+                                  !resizeState.isResizing &&
+                                  !(e.target as HTMLElement).closest(
+                                    '[data-resize-handle]',
+                                  )
+                                ) {
+                                  onEventClick(event)
+                                }
+                              }}
+                            >
+                              {showTopHandle && (
+                                <ResizeHandle
+                                  edge="top"
+                                  floating={floatHandles}
+                                  {...getResizeHandleProps(
+                                    event.id,
+                                    'top',
+                                    originalStart,
+                                    originalEnd,
+                                    {
+                                      occurrenceStart:
+                                        event._occurrenceOriginalStart,
+                                    },
+                                  )}
+                                />
+                              )}
+                              <div className="font-semibold pt-1 flex items-center gap-1.5">
+                                <span className="flex items-center gap-1 min-w-0">
+                                  {event.recurrence && (
+                                    <span
+                                      className="opacity-60 flex-shrink-0"
+                                      title="Recurring event"
+                                    >
+                                      ↻
+                                    </span>
+                                  )}
+                                  <span className="truncate">
+                                    {event.title}
+                                  </span>
+                                </span>
+                                {event.consumption &&
+                                  event.consumption.length > 0 && (
+                                    <span
+                                      className="text-[10px] leading-none rounded bg-black/40 px-1 py-0.5 font-semibold flex-shrink-0"
+                                      title="Consumption"
+                                    >
+                                      {event.consumption.reduce(
+                                        (a, b) => a + b,
+                                        0,
+                                      )}
+                                    </span>
+                                  )}
+                              </div>
+                              {displayStyle &&
+                                parseFloat(displayStyle.height) > 2 && (
+                                  <div className="text-xs opacity-90 mt-0.5">
+                                    {timeRange.rangeFormatted}
+                                  </div>
+                                )}
+                              {showBottomHandle && (
+                                <ResizeHandle
+                                  edge="bottom"
+                                  floating={floatHandles}
+                                  {...getResizeHandleProps(
+                                    event.id,
+                                    'bottom',
+                                    originalStart,
+                                    originalEnd,
+                                    {
+                                      occurrenceStart:
+                                        event._occurrenceOriginalStart,
+                                    },
+                                  )}
+                                />
+                              )}
+                            </ContextMenuTrigger>
+                            <ContextMenuContent>
+                              <ContextMenuItem
+                                onClick={() => onEventClick(event)}
+                              >
+                                {event.recurrence
+                                  ? 'Edit this occurrence'
+                                  : 'Edit event'}
+                              </ContextMenuItem>
+                              {event.recurrence && (
+                                <>
+                                  <ContextMenuItem
+                                    onClick={() =>
+                                      onEventClick(event, 'thisAndFollowing')
+                                    }
+                                  >
+                                    Edit this and following
+                                  </ContextMenuItem>
+                                  <ContextMenuItem
+                                    onClick={() => onEventClick(event, 'all')}
+                                  >
+                                    Edit series
+                                  </ContextMenuItem>
+                                </>
+                              )}
+                              {event.recurrence && (
+                                <>
+                                  <ContextMenuSeparator />
+                                  <ContextMenuItem
+                                    onClick={() =>
+                                      calendar.goToPreviousOccurrence(
+                                        event.id,
+                                        event.start,
+                                      )
+                                    }
+                                  >
+                                    ← Previous occurrence
+                                  </ContextMenuItem>
+                                  <ContextMenuItem
+                                    onClick={() =>
+                                      calendar.goToNextOccurrence(
+                                        event.id,
+                                        event.start,
+                                      )
+                                    }
+                                  >
+                                    Next occurrence →
+                                  </ContextMenuItem>
+                                </>
+                              )}
+                            </ContextMenuContent>
+                          </ContextMenu>
+                        )
+                      })}
+                      {resizeState.isResizing &&
+                        resizeState.previewStart &&
+                        resizeState.previewEnd &&
+                        !day.events.some((e) => e.id === resizeState.eventId) &&
+                        (() => {
+                          const ghostStyle = calculateGhostPreviewStyle({
+                            dayDate,
+                            previewStart: resizeState.previewStart,
+                            previewEnd: resizeState.previewEnd,
+                          })
+
+                          if (!ghostStyle) return null
+
+                          const timeRange = formatEventTimeRange(
+                            resizeState.previewStart,
+                            resizeState.previewEnd,
+                          )
+
+                          return (
+                            <div
+                              className="absolute bg-neutral-700/60 text-neutral-200 rounded px-2 py-1 text-xs font-medium overflow-hidden border border-neutral-600 border-dashed z-20"
+                              style={ghostStyle}
+                            >
+                              <div className="font-semibold pt-1 opacity-80">
+                                {timeRange.rangeFormatted}
+                              </div>
+                            </div>
+                          )
+                        })()}
+                    </div>
+                  </div>
+                )
+              })}
+            </div>
+            <div ref={rightSentinelRef} style={{ width: 1 }} aria-hidden />
+          </div>
+        </ScrollArea>
+      </div>
+    </div>
+  )
+}
+
+function ResizeErrorToast({
+  error,
+  onDismiss,
+}: {
+  error: ResizeError
+  onDismiss: () => void
+}) {
+  useEffect(() => {
+    const timer = setTimeout(onDismiss, 5000)
+    return () => clearTimeout(timer)
+  }, [onDismiss])
+
+  return (
+    <div className="fixed bottom-5 right-5 z-50 animate-in slide-in-from-bottom-2 fade-in duration-200">
+      <div className="bg-red-950/90 border border-red-700/50 text-red-200 rounded-lg px-4 py-3 shadow-lg max-w-md">
+        <div className="flex items-start gap-3">
+          <div className="text-red-400 text-lg">⚠</div>
+          <div className="flex-1 min-w-0">
+            <div className="font-semibold text-red-100 mb-1">
+              Cannot Resize Event
+            </div>
+            <div className="text-sm text-red-200/80 mb-2">{error.message}</div>
+            {error.conflicts && error.conflicts.length > 0 && (
+              <div className="mt-2 space-y-1">
+                <div className="text-xs text-red-300/70 font-medium uppercase tracking-wide">
+                  Conflicts:
+                </div>
+                {error.conflicts.map((conflict, idx) => (
+                  <div
+                    key={idx}
+                    className="text-xs text-red-200/70 bg-red-950/50 rounded px-2 py-1.5 border border-red-800/30"
+                  >
+                    <div className="font-medium text-red-200/90">
+                      {conflict.date}
+                    </div>
+                    <div className="text-red-300/60">
+                      {conflict.conflictRange.start} -{' '}
+                      {conflict.conflictRange.end}
+                    </div>
+                    <div className="text-red-300/50 mt-0.5">
+                      {conflict.description}
+                    </div>
+                  </div>
+                ))}
+              </div>
+            )}
+            <div className="text-xs text-red-300/60 mt-2">
+              {error.eventTitle}
+            </div>
+          </div>
+          <Button
+            variant="ghost"
+            size="icon"
+            onClick={onDismiss}
+            className="text-destructive-foreground/60 hover:text-destructive-foreground h-6 w-6"
+          >
+            ✕
+          </Button>
+        </div>
+      </div>
+    </div>
+  )
+}
+
+function ScopeChoiceModal({
+  event,
+  isOpen,
+  title = 'Edit recurring event',
+  onSelect,
+  onClose,
+}: {
+  event: Event<Resource> | null
+  isOpen: boolean
+  title?: string
+  onSelect: (scope: RecurrenceEditScope) => void
+  onClose: () => void
+}) {
+  if (!isOpen) return null
+  return (
+    <Dialog open={isOpen} onOpenChange={(open) => !open && onClose()}>
+      <DialogContent className="sm:max-w-xs bg-card border-border">
+        <DialogHeader>
+          <DialogTitle>{title}</DialogTitle>
+        </DialogHeader>
+        <div className="mt-2 text-sm text-neutral-400">
+          {event?.title ?? 'Choose how to apply this recurring-event change.'}
+        </div>
+        <div className="space-y-2 mt-4">
+          <Button
+            type="button"
+            variant="outline"
+            className="w-full justify-start"
+            onClick={() => onSelect('this')}
+          >
+            This occurrence
+          </Button>
+          <Button
+            type="button"
+            variant="outline"
+            className="w-full justify-start"
+            onClick={() => onSelect('thisAndFollowing')}
+          >
+            This and following
+          </Button>
+          <Button
+            type="button"
+            variant="outline"
+            className="w-full justify-start"
+            onClick={() => onSelect('all')}
+          >
+            All events
+          </Button>
+        </div>
+      </DialogContent>
+    </Dialog>
+  )
+}
+
+function CalendarView() {
+  const [resources, setResources] = useState<Array<Resource>>(sampleResources)
+
+  const [modalState, setModalState] = useState<{
+    isOpen: boolean
+    mode: 'add' | 'edit'
+    eventId?: string
+    occurrenceStart?: string
+    isRecurring?: boolean
+    initialData: EventFormData
+  }>({
+    isOpen: false,
+    mode: 'add',
+    initialData: emptyFormData,
+  })
+
+  const [scopeChoiceEvent, setScopeChoiceEvent] =
+    useState<Event<Resource> | null>(null)
+  const [resizeScopeChoice, setResizeScopeChoice] = useState<{
+    eventId: string
+    occurrenceStart: EventDateTimeInput
+    newStart: string
+    newEnd: string
+  } | null>(null)
+
+  const [resizeError, setResizeError] = useState<ResizeError | null>(null)
+
+  const calendar = useCalendar<Resource, Event<Resource>>({
+    viewMode: { value: 1, unit: 'month' },
+    events: [],
+    resources,
+    timeZone: 'UTC',
+    fetchEvents: async ({ start, end }) => {
+      await new Promise((resolve) => setTimeout(resolve, 300))
+
+      const startDate = new Date(start)
+      const endDate = new Date(end)
+      const resourceById = new Map(
+        resources.map((resource) => [resource.id, resource]),
+      )
+
+      return MOCK_DB.filter((e) => {
+        if (e.recurrence) return true
+        const eStart = new Date(e.start as string)
+        const eEnd = new Date(e.end as string)
+        return eStart <= endDate && eEnd >= startDate
+      }).map((event) => ({
+        ...event,
+        resources:
+          event.resources
+            ?.map((resource) => resourceById.get(getResourceId(resource)))
+            .filter((resource): resource is Resource => resource != null) ?? [],
+      }))
+    },
+    resize: {
+      enabled: true,
+      containerHeight: 1440,
+      constraints: {
+        minDurationMinutes: 15,
+        snapToMinutes: 15,
+      },
+      onResizeError: (error) => {
+        setResizeError(error)
+      },
+      onRecurringResizeEnd: (resize) => {
+        setResizeScopeChoice({
+          eventId: resize.eventId,
+          occurrenceStart: resize.occurrenceStart,
+          newStart: resize.newStart,
+          newEnd: resize.newEnd,
+        })
+      },
+    },
+  })
+
+  const dayNames = calendar.getDaysNames('short')
+
+  const isScheduleView =
+    calendar.viewMode.unit === 'week' || calendar.viewMode.unit === 'day'
+  const scheduleDays: Array<Day<Resource, Event<Resource>>> = isScheduleView
+    ? calendar.viewMode.unit === 'day'
+      ? calendar.days.filter((day) => {
+          const currentDateStr = calendar.currentPeriod.split('[')[0]
+          return day.date.toString({ calendarName: 'never' }) === currentDateStr
+        })
+      : calendar.days
+    : []
+
+  const monthScrollRef = useRef<HTMLDivElement>(null)
+  const monthBufferRef = useRef<{ start: string; end: string } | null>(null)
+  if (monthBufferRef.current === null && calendar.days.length > 0) {
+    monthBufferRef.current = {
+      start: calendar.days[0].isoDate,
+      end: calendar.days[calendar.days.length - 1].isoDate,
+    }
+  }
+
+  const navDirectionRef = useRef<'none' | 'forward' | 'backward'>('none')
+  const prevPeriodRef = useRef(calendar.currentPeriod)
+  const prevScrollHeightRef = useRef(0)
+  const needsScrollAdjRef = useRef(false)
+  const [bufferVersion, setBufferVersion] = useState(0)
+
+  const [visibleMonth, setVisibleMonth] = useState(() =>
+    calendar.formatCurrentPeriod(),
+  )
+  const rafRef = useRef<number | undefined>(undefined)
+
+  useEffect(() => {
+    setVisibleMonth(calendar.formatCurrentPeriod())
+  }, [calendar.currentPeriod])
+
+  useEffect(() => {
+    const el = monthScrollRef.current
+    if (!el) return
+
+    const compute = () => {
+      if (rafRef.current) return
+      rafRef.current = requestAnimationFrame(() => {
+        rafRef.current = undefined
+        const viewportRect = el.getBoundingClientRect()
+        const cells = el.querySelectorAll<HTMLElement>('[data-day-date]')
+        for (const cell of cells) {
+          const cellRect = cell.getBoundingClientRect()
+          if (cellRect.bottom > viewportRect.top) {
+            const iso = cell.getAttribute('data-day-date')
+            if (iso) {
+              const d = new Date(`${iso}T00:00:00`)
+              setVisibleMonth(
+                d.toLocaleDateString(undefined, {
+                  month: 'long',
+                  year: 'numeric',
+                }),
+              )
+            }
+            break
+          }
+        }
+      })
+    }
+
+    el.addEventListener('scroll', compute, { passive: true })
+    compute()
+    return () => el.removeEventListener('scroll', compute)
+  }, [bufferVersion])
+
+  useEffect(() => {
+    if (navDirectionRef.current === 'none') return
+    if (calendar.currentPeriod === prevPeriodRef.current) return
+    prevPeriodRef.current = calendar.currentPeriod
+
+    const direction = navDirectionRef.current
+    navDirectionRef.current = 'none'
+
+    if (calendar.days.length === 0 || !monthBufferRef.current) return
+    const newStart = calendar.days[0].isoDate
+    const newEnd = calendar.days[calendar.days.length - 1].isoDate
+    monthBufferRef.current = {
+      start:
+        newStart < monthBufferRef.current.start
+          ? newStart
+          : monthBufferRef.current.start,
+      end:
+        newEnd > monthBufferRef.current.end
+          ? newEnd
+          : monthBufferRef.current.end,
+    }
+
+    if (direction === 'backward') {
+      prevScrollHeightRef.current = monthScrollRef.current?.scrollHeight ?? 0
+      needsScrollAdjRef.current = true
+    }
+
+    setBufferVersion((v) => v + 1)
+  }, [calendar.currentPeriod, calendar.days])
+
+  useLayoutEffect(() => {
+    if (!needsScrollAdjRef.current) return
+    needsScrollAdjRef.current = false
+    const el = monthScrollRef.current
+    if (el) {
+      el.scrollTop += el.scrollHeight - prevScrollHeightRef.current
+    }
+  })
+
+  const bufferedWeekGroups = useMemo(() => {
+    void bufferVersion
+    void calendar.days
+    if (!monthBufferRef.current) return []
+    const days = calendar.getDaysInRange(
+      monthBufferRef.current.start,
+      monthBufferRef.current.end,
+    )
+    return calendar.groupDaysBy({
+      days,
+      unit: 'week',
+      fillMissingDays: true,
+    })
+  }, [
+    bufferVersion,
+    calendar.days,
+    calendar.getDaysInRange,
+    calendar.groupDaysBy,
+  ])
+
+  const { startSentinelRef: monthTopRef, endSentinelRef: monthBottomRef } =
+    useInfiniteScroll({
+      root: monthScrollRef,
+      rootMargin: '120px 0px',
+      cooldownMs: 1000,
+      onReachStart: () => {
+        const el = monthScrollRef.current
+        if (!el || el.scrollHeight <= el.clientHeight) return
+        if (!calendar.canGoPreviousPeriod() || calendar.isPending) return
+        navDirectionRef.current = 'backward'
+        calendar.goToPreviousPeriod()
+      },
+      onReachEnd: () => {
+        if (!calendar.canGoNextPeriod() || calendar.isPending) return
+        navDirectionRef.current = 'forward'
+        calendar.goToNextPeriod()
+      },
+      disabled: isScheduleView,
+    })
+
+  const scheduleScrollRef = useRef<HTMLDivElement>(null)
+  const scheduleBufferRef = useRef<{ start: string; end: string } | null>(null)
+  const scheduleNavDirectionRef = useRef<'none' | 'forward' | 'backward'>(
+    'none',
+  )
+  const prevSchedulePeriodRef = useRef(calendar.currentPeriod)
+  const prevScheduleScrollWidthRef = useRef(0)
+  const needsScheduleScrollAdjRef = useRef(false)
+  const [scheduleBufferVersion, setScheduleBufferVersion] = useState(0)
+  const prevViewModeUnitRef = useRef(calendar.viewMode.unit)
+
+  if (prevViewModeUnitRef.current !== calendar.viewMode.unit) {
+    prevViewModeUnitRef.current = calendar.viewMode.unit
+    scheduleBufferRef.current = null
+    prevSchedulePeriodRef.current = calendar.currentPeriod
+    monthBufferRef.current =
+      calendar.days.length > 0
+        ? {
+            start: calendar.days[0].isoDate,
+            end: calendar.days[calendar.days.length - 1].isoDate,
+          }
+        : null
+  }
+
+  if (
+    isScheduleView &&
+    scheduleBufferRef.current === null &&
+    scheduleDays.length > 0
+  ) {
+    scheduleBufferRef.current = {
+      start: scheduleDays[0].isoDate,
+      end: scheduleDays[scheduleDays.length - 1].isoDate,
+    }
+  }
+
+  useEffect(() => {
+    if (!isScheduleView) return
+    if (calendar.currentPeriod === prevSchedulePeriodRef.current) return
+    prevSchedulePeriodRef.current = calendar.currentPeriod
+
+    let currentDays: typeof calendar.days
+    if (calendar.viewMode.unit === 'day') {
+      const currentDateStr = calendar.currentPeriod.split('[')[0]
+      currentDays = calendar.days.filter(
+        (day) =>
+          day.date.toString({ calendarName: 'never' }) === currentDateStr,
+      )
+    } else {
+      currentDays = calendar.days
+    }
+
+    if (currentDays.length === 0) return
+    const newStart = currentDays[0].isoDate
+    const newEnd = currentDays[currentDays.length - 1].isoDate
+
+    if (scheduleNavDirectionRef.current === 'none') {
+      scheduleBufferRef.current = { start: newStart, end: newEnd }
+    } else {
+      const direction = scheduleNavDirectionRef.current
+      scheduleNavDirectionRef.current = 'none'
+      const prev = scheduleBufferRef.current ?? {
+        start: newStart,
+        end: newEnd,
+      }
+      scheduleBufferRef.current = {
+        start: newStart < prev.start ? newStart : prev.start,
+        end: newEnd > prev.end ? newEnd : prev.end,
+      }
+      if (direction === 'backward') {
+        prevScheduleScrollWidthRef.current =
+          scheduleScrollRef.current?.scrollWidth ?? 0
+        needsScheduleScrollAdjRef.current = true
+      }
+    }
+
+    setScheduleBufferVersion((v) => v + 1)
+  }, [
+    calendar.currentPeriod,
+    isScheduleView,
+    calendar.viewMode.unit,
+    calendar.days,
+  ])
+
+  useLayoutEffect(() => {
+    if (!needsScheduleScrollAdjRef.current) return
+    needsScheduleScrollAdjRef.current = false
+    const el = scheduleScrollRef.current
+    if (el) {
+      el.scrollLeft += el.scrollWidth - prevScheduleScrollWidthRef.current
+    }
+  })
+
+  const bufferedScheduleDays = useMemo(() => {
+    void scheduleBufferVersion
+    void calendar.days
+    if (!scheduleBufferRef.current) return scheduleDays
+    return calendar.getDaysInRange(
+      scheduleBufferRef.current.start,
+      scheduleBufferRef.current.end,
+    )
+  }, [
+    scheduleBufferVersion,
+    scheduleDays,
+    calendar.days,
+    calendar.getDaysInRange,
+  ])
+
+  const periodDayCount =
+    calendar.viewMode.unit === 'day' ? 1 : scheduleDays.length || 7
+
+  const {
+    startSentinelRef: scheduleLeftRef,
+    endSentinelRef: scheduleRightRef,
+  } = useInfiniteScroll({
+    root: scheduleScrollRef,
+    rootMargin: '0px 50%',
+    cooldownMs: 300,
+    onReachStart: () => {
+      const el = scheduleScrollRef.current
+      if (!el || el.scrollWidth <= el.clientWidth) return
+      if (!calendar.canGoPreviousPeriod() || calendar.isPending) return
+      scheduleNavDirectionRef.current = 'backward'
+      calendar.goToPreviousPeriod()
+    },
+    onReachEnd: () => {
+      if (!calendar.canGoNextPeriod() || calendar.isPending) return
+      scheduleNavDirectionRef.current = 'forward'
+      calendar.goToNextPeriod()
+    },
+    disabled: !isScheduleView,
+  })
+
+  const openAddModal = () => {
+    setModalState({
+      isOpen: true,
+      mode: 'add',
+      initialData: {
+        ...emptyFormData,
+        resourceId: resources[0]?.id ?? '',
+      },
+    })
+  }
+
+  const handleEventClick = (
+    event: Event<Resource>,
+    scope?: RecurrenceEditScope,
+  ) => {
+    if (event.recurrence && !scope) {
+      setScopeChoiceEvent(event)
+      return
+    }
+    openEditModal(event, scope)
+  }
+
+  const openEditModal = (
+    event: Event<Resource>,
+    scope: RecurrenceEditScope = event.recurrence ? 'this' : 'all',
+  ) => {
+    const masterEvent = calendar.getMasterEvent(event)
+    const segmentInfo = calendar.getEventSegmentInfo(event)
+    const startDate = new Date(segmentInfo.originalStart)
+    const endDate = new Date(segmentInfo.originalEnd)
+    const rule = masterEvent.recurrence
+    const isRecurring = !!rule
+    const eventResource = event.resources?.[0] ?? masterEvent.resources?.[0]
+    const eventResourceId = eventResource ? getResourceId(eventResource) : ''
+
+    setModalState({
+      isOpen: true,
+      mode: 'edit',
+      eventId: isRecurring ? event.id : masterEvent.id,
+      occurrenceStart: isRecurring
+        ? (event._occurrenceOriginalStart ?? segmentInfo.originalStart)
+        : undefined,
+      isRecurring,
+      initialData: {
+        title: event.title,
+        startDate: formatDateToISO(startDate),
+        startTime: startDate.toTimeString().slice(0, 5),
+        endDate: formatDateToISO(endDate),
+        endTime: endDate.toTimeString().slice(0, 5),
+        resourceId: eventResourceId || resources[0]?.id || '',
+        consumption:
+          event.consumption?.[0] ?? masterEvent.consumption?.[0] ?? 1,
+        recurrenceFrequency: rule?.frequency ?? 'none',
+        recurrenceUntil: rule?.until ?? '',
+        recurrenceEditScope: scope,
+        allDay: !!event.allDay,
+      },
+    })
+  }
+
+  const closeModal = () => {
+    setModalState((prev) => ({ ...prev, isOpen: false }))
+  }
+
+  const [isSaving, setIsSaving] = useState(false)
+
+  const handleSave = async (data: EventFormData) => {
+    setIsSaving(true)
+    try {
+      const recurrence: RecurrenceRule | undefined =
+        data.recurrenceFrequency !== 'none'
+          ? {
+              frequency: data.recurrenceFrequency,
+              ...(data.recurrenceUntil ? { until: data.recurrenceUntil } : {}),
+            }
+          : undefined
+
+      const start = data.allDay
+        ? `${data.startDate}T00:00:00`
+        : `${data.startDate}T${data.startTime}:00`
+      const end = data.allDay
+        ? `${data.endDate}T23:59:59`
+        : `${data.endDate}T${data.endTime}:00`
+      const selectedResource = resources.find((r) => r.id === data.resourceId)
+      const eventResources =
+        data.allDay || !selectedResource ? [] : [selectedResource]
+      const eventConsumption = data.allDay ? [] : [data.consumption]
+
+      const updates: Partial<Omit<Event<Resource>, 'id'>> = {
+        title: data.title,
+        start,
+        end,
+        ...(modalState.isRecurring && data.recurrenceEditScope === 'this'
+          ? {}
+          : { recurrence }),
+        resources: eventResources,
+        consumption: eventConsumption,
+        allDay: data.allDay,
+      }
+
+      const result =
+        modalState.mode === 'edit' && modalState.eventId
+          ? modalState.isRecurring
+            ? await calendar.editRecurringEvent(modalState.eventId, updates, {
+                scope: data.recurrenceEditScope,
+                occurrenceStart: modalState.occurrenceStart,
+              })
+            : await calendar.editEvent(modalState.eventId, updates)
+          : await calendar.addEvent({
+              id: String(Date.now()),
+              title: data.title,
+              start,
+              end,
+              recurrence,
+              resources: eventResources,
+              consumption: eventConsumption,
+              allDay: data.allDay,
+            })
+      if (!result.success) {
+        setResizeError(result.error)
+        throw new Error('Validation failed')
+      }
+    } finally {
+      setIsSaving(false)
+    }
+  }
+
+  const handleDelete = (data: EventFormData) => {
+    if (!modalState.eventId) return
+
+    if (modalState.isRecurring) {
+      calendar.removeRecurringEvent(modalState.eventId, {
+        scope: data.recurrenceEditScope,
+        occurrenceStart: modalState.occurrenceStart,
+      })
+      return
+    }
+
+    calendar.removeEvent(modalState.eventId)
+  }
+
+  return (
+    <div className="p-5 max-w-[1200px] mx-auto min-h-screen">
+      <div className="mb-6">
+        <h1 className="m-0 mb-4 text-[28px] font-semibold text-white">
+          TanStack Time
+        </h1>
+
+        <div className="flex gap-3 items-center mb-4 flex-wrap">
+          <Button
+            onClick={calendar.goToPreviousPeriod}
+            disabled={!calendar.canGoPreviousPeriod() || calendar.isPending}
+            variant="outline"
+          >
+            ← Previous
+          </Button>
+
+          <Button
+            onClick={calendar.goToCurrentPeriod}
+            disabled={calendar.isPending}
+            variant="outline"
+          >
+            Today
+          </Button>
+
+          <Button
+            onClick={calendar.goToNextPeriod}
+            disabled={!calendar.canGoNextPeriod() || calendar.isPending}
+            variant="outline"
+          >
+            Next →
+          </Button>
+
+          <Button onClick={openAddModal}>+ Add Event</Button>
+
+          <Button
+            onClick={calendar.undo}
+            disabled={!calendar.canUndo()}
+            variant="outline"
+            title="Undo"
+          >
+            ↩ Undo
+          </Button>
+          <Button
+            onClick={calendar.redo}
+            disabled={!calendar.canRedo()}
+            variant="outline"
+            title="Redo"
+          >
+            ↪ Redo
+          </Button>
+
+          <div className="ml-auto flex gap-2">
+            <Button
+              onClick={() =>
+                calendar.changeViewMode({ value: 1, unit: 'month' })
+              }
+              variant={
+                calendar.viewMode.unit === 'month' ? 'secondary' : 'outline'
+              }
+              size="sm"
+            >
+              Month
+            </Button>
+            <Button
+              onClick={() =>
+                calendar.changeViewMode({ value: 1, unit: 'week' })
+              }
+              variant={
+                calendar.viewMode.unit === 'week' ? 'secondary' : 'outline'
+              }
+              size="sm"
+            >
+              Week
+            </Button>
+            <Button
+              onClick={() => calendar.changeViewMode({ value: 1, unit: 'day' })}
+              variant={
+                calendar.viewMode.unit === 'day' ? 'secondary' : 'outline'
+              }
+              size="sm"
+            >
+              Day
+            </Button>
+          </div>
+        </div>
+
+        <div className="mb-4 rounded-lg border border-neutral-800 bg-neutral-950 px-4 py-3">
+          <div className="mb-2 text-xs uppercase tracking-wide text-neutral-500">
+            Capacity Controls
+          </div>
+          <div className="flex flex-wrap gap-3">
+            {resources.map((resource) => {
+              const currentCapacity = resource.capacity?.[0] ?? 1
+              return (
+                <div
+                  key={resource.id}
+                  className="flex items-center gap-2 rounded-md border border-neutral-800 bg-black px-3 py-2"
+                >
+                  <span className="text-sm text-neutral-300">
+                    {resource.label}
+                  </span>
+                  <Input
+                    type="number"
+                    min={1}
+                    step={1}
+                    value={currentCapacity}
+                    onChange={(e) => {
+                      const nextCapacity = Math.max(
+                        1,
+                        Number(e.target.value) || 1,
+                      )
+                      setResources((prev) =>
+                        prev.map((r) =>
+                          r.id === resource.id
+                            ? { ...r, capacity: [nextCapacity] }
+                            : r,
+                        ),
+                      )
+                    }}
+                    className="h-8 w-24"
+                  />
+                </div>
+              )
+            })}
+          </div>
+        </div>
+
+        <div className="text-lg font-medium text-neutral-400">
+          {visibleMonth}
+        </div>
+      </div>
+
+      {isScheduleView ? (
+        <ScheduleView
+          calendar={calendar}
+          days={bufferedScheduleDays}
+          resources={resources}
+          onEventClick={handleEventClick}
+          scrollRef={scheduleScrollRef}
+          leftSentinelRef={scheduleLeftRef}
+          rightSentinelRef={scheduleRightRef}
+          periodDayCount={periodDayCount}
+        />
+      ) : (
+        <div className="border border-neutral-800 rounded-lg overflow-hidden bg-black">
+          {/* Sticky day-name header */}
+          <div
+            className="grid border-b border-neutral-800 bg-neutral-950 sticky top-0 z-10"
+            style={{
+              gridTemplateColumns: `repeat(${dayNames.length}, minmax(0, 1fr))`,
+            }}
+          >
+            {dayNames.map((dayName: string, index: number) => (
+              <div
+                key={index}
+                className={`py-3 text-center font-semibold text-sm text-neutral-500 ${
+                  index < dayNames.length - 1
+                    ? 'border-r border-neutral-800'
+                    : ''
+                }`}
+              >
+                {dayName}
+              </div>
+            ))}
+          </div>
+
+          {/* Scrollable month body — sentinels trigger period navigation */}
+          <ScrollArea
+            viewportRef={monthScrollRef}
+            className="h-[calc(100vh-260px)]"
+          >
+            {/* Top sentinel: triggers goToPreviousPeriod */}
+            <div ref={monthTopRef} style={{ height: 1 }} aria-hidden />
+
+            <div
+              className="grid"
+              style={{
+                gridTemplateColumns: `repeat(${dayNames.length}, minmax(0, 1fr))`,
+              }}
+            >
+              {bufferedWeekGroups.map(
+                (
+                  week: Array<Day<Resource, Event<Resource>> | null>,
+                  weekIndex: number,
+                ) => {
+                  const weekKey =
+                    week.find((d) => d !== null)?.isoDate ?? `w-${weekIndex}`
+                  return week.map((day, dayIndex) => {
+                    if (!day) {
+                      return (
+                        <div
+                          key={`empty-${weekKey}-${dayIndex}`}
+                          className={`min-h-[120px] bg-neutral-950/50 ${
+                            dayIndex < dayNames.length - 1
+                              ? 'border-r border-neutral-800'
+                              : ''
+                          } border-b border-neutral-800`}
+                        />
+                      )
+                    }
+
+                    const isToday = day.isToday
+                    const isInCurrentPeriod = day.isInCurrentPeriod
+
+                    return (
+                      <div
+                        key={day.isoDate}
+                        data-day-date={day.isoDate}
+                        className={`min-h-[120px] p-2 relative flex flex-col ${
+                          dayIndex < dayNames.length - 1
+                            ? 'border-r border-neutral-800'
+                            : ''
+                        } border-b border-neutral-800 ${
+                          isToday
+                            ? 'bg-neutral-900'
+                            : isInCurrentPeriod
+                              ? 'bg-black'
+                              : 'bg-neutral-950/50'
+                        }`}
+                      >
+                        <div
+                          className={`text-sm mb-1 flex-shrink-0 ${
+                            isToday
+                              ? 'font-bold text-white'
+                              : isInCurrentPeriod
+                                ? 'font-medium text-neutral-200'
+                                : 'font-medium text-neutral-500'
+                          }`}
+                        >
+                          {day.date.day}
+                        </div>
+                        <div className="flex flex-col gap-1 flex-1 min-h-0">
+                          {day.allDayEvents.map((event) => (
+                            <Badge
+                              key={`ad-${event.id}`}
+                              className="cursor-pointer bg-amber-700/70 hover:bg-amber-600/80 text-amber-50 border border-amber-600/40 flex items-center gap-1.5 max-w-full flex-shrink-0 w-full"
+                              title={event.title}
+                              onClick={() => handleEventClick(event)}
+                            >
+                              <span className="truncate">{event.title}</span>
+                            </Badge>
+                          ))}
+                          {day.events.map((event) => (
+                            <ContextMenu key={event.id}>
+                              <ContextMenuTrigger className="contents">
+                                <Badge
+                                  variant="secondary"
+                                  className="cursor-pointer hover:bg-muted flex items-center gap-1.5 max-w-full flex-shrink-0 w-full"
+                                  title={event.title}
+                                  onClick={() => handleEventClick(event)}
+                                >
+                                  <span className="flex items-center gap-1 min-w-0">
+                                    {event.recurrence && (
+                                      <span
+                                        className="opacity-60 flex-shrink-0"
+                                        title="Recurring event"
+                                      >
+                                        ↻
+                                      </span>
+                                    )}
+                                    <span className="truncate">
+                                      {event.title}
+                                    </span>
+                                  </span>
+                                  {event.consumption &&
+                                    event.consumption.length > 0 && (
+                                      <span
+                                        className="text-[10px] leading-none rounded bg-black/40 px-1 py-0.5 font-semibold flex-shrink-0"
+                                        title="Consumption"
+                                      >
+                                        {event.consumption.reduce(
+                                          (a, b) => a + b,
+                                          0,
+                                        )}
+                                      </span>
+                                    )}
+                                </Badge>
+                              </ContextMenuTrigger>
+                              <ContextMenuContent>
+                                <ContextMenuItem
+                                  onClick={() => openEditModal(event)}
+                                >
+                                  {event.recurrence
+                                    ? 'Edit this occurrence'
+                                    : 'Edit event'}
+                                </ContextMenuItem>
+                                {event.recurrence && (
+                                  <>
+                                    <ContextMenuItem
+                                      onClick={() =>
+                                        openEditModal(event, 'thisAndFollowing')
+                                      }
+                                    >
+                                      Edit this and following
+                                    </ContextMenuItem>
+                                    <ContextMenuItem
+                                      onClick={() =>
+                                        openEditModal(event, 'all')
+                                      }
+                                    >
+                                      Edit series
+                                    </ContextMenuItem>
+                                  </>
+                                )}
+                                {event.recurrence && (
+                                  <>
+                                    <ContextMenuSeparator />
+                                    <ContextMenuItem
+                                      onClick={() =>
+                                        calendar.goToPreviousOccurrence(
+                                          event.id,
+                                          event.start,
+                                        )
+                                      }
+                                    >
+                                      ← Previous occurrence
+                                    </ContextMenuItem>
+                                    <ContextMenuItem
+                                      onClick={() =>
+                                        calendar.goToNextOccurrence(
+                                          event.id,
+                                          event.start,
+                                        )
+                                      }
+                                    >
+                                      Next occurrence →
+                                    </ContextMenuItem>
+                                  </>
+                                )}
+                              </ContextMenuContent>
+                            </ContextMenu>
+                          ))}
+                        </div>
+                      </div>
+                    )
+                  })
+                },
+              )}
+            </div>
+
+            {/* Bottom sentinel: triggers goToNextPeriod */}
+            <div ref={monthBottomRef} style={{ height: 1 }} aria-hidden />
+          </ScrollArea>
+        </div>
+      )}
+
+      {calendar.isPending && (
+        <div className="fixed top-5 right-5 px-5 py-3 bg-card border border-border text-foreground rounded-md text-sm font-medium">
+          Loading...
+        </div>
+      )}
+
+      <ScopeChoiceModal
+        event={scopeChoiceEvent}
+        isOpen={!!scopeChoiceEvent}
+        onSelect={(scope) => {
+          if (scopeChoiceEvent) {
+            openEditModal(scopeChoiceEvent, scope)
+          }
+          setScopeChoiceEvent(null)
+        }}
+        onClose={() => setScopeChoiceEvent(null)}
+      />
+
+      <ScopeChoiceModal
+        event={null}
+        title="Resize recurring event"
+        isOpen={!!resizeScopeChoice}
+        onSelect={(scope) => {
+          const pending = resizeScopeChoice
+          setResizeScopeChoice(null)
+          if (!pending) return
+          void calendar
+            .editRecurringEvent(
+              pending.eventId,
+              { start: pending.newStart, end: pending.newEnd },
+              { scope, occurrenceStart: pending.occurrenceStart },
+            )
+            .then((result) => {
+              if (!result.success) setResizeError(result.error)
+            })
+        }}
+        onClose={() => setResizeScopeChoice(null)}
+      />
+
+      <EventModal
+        isOpen={modalState.isOpen}
+        onClose={closeModal}
+        onSave={handleSave}
+        onDelete={modalState.mode === 'edit' ? handleDelete : undefined}
+        initialData={modalState.initialData}
+        mode={modalState.mode}
+        isRecurring={modalState.isRecurring}
+        isSaving={isSaving}
+        resources={resources}
+      />
+
+      {resizeError && (
+        <ResizeErrorToast
+          error={resizeError}
+          onDismiss={() => setResizeError(null)}
+        />
+      )}
+    </div>
+  )
+}
+
+function App() {
+  return (
+    <>
+      <TanStackDevtools plugins={[timeDevtoolsPlugin()]} />
+      <CalendarView />
+    </>
+  )
+}
+
+ReactDOM.createRoot(document.getElementById('root')!).render(<App />)
diff --git a/examples/react/calendar/tailwind.config.js b/examples/react/calendar/tailwind.config.js
new file mode 100644
index 00000000..0779e02a
--- /dev/null
+++ b/examples/react/calendar/tailwind.config.js
@@ -0,0 +1,54 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  darkMode: ['class'],
+  content: ['./index.html', './src/**/*.{js,ts,jsx,tsx}'],
+  theme: {
+    extend: {
+      colors: {
+        border: 'hsl(var(--border))',
+        input: 'hsl(var(--input))',
+        ring: 'hsl(var(--ring))',
+        background: 'hsl(var(--background))',
+        foreground: 'hsl(var(--foreground))',
+        primary: {
+          DEFAULT: 'hsl(var(--primary))',
+          foreground: 'hsl(var(--primary-foreground))',
+        },
+        secondary: {
+          DEFAULT: 'hsl(var(--secondary))',
+          foreground: 'hsl(var(--secondary-foreground))',
+        },
+        destructive: {
+          DEFAULT: 'hsl(var(--destructive))',
+          foreground: 'hsl(var(--destructive-foreground))',
+        },
+        muted: {
+          DEFAULT: 'hsl(var(--muted))',
+          foreground: 'hsl(var(--muted-foreground))',
+        },
+        accent: {
+          DEFAULT: 'hsl(var(--accent))',
+          foreground: 'hsl(var(--accent-foreground))',
+        },
+        card: {
+          DEFAULT: 'hsl(var(--card))',
+          foreground: 'hsl(var(--card-foreground))',
+        },
+        popover: {
+          DEFAULT: 'hsl(var(--popover))',
+          foreground: 'hsl(var(--popover-foreground))',
+        },
+      },
+      borderRadius: {
+        lg: 'var(--radius)',
+        md: 'calc(var(--radius) - 2px)',
+        sm: 'calc(var(--radius) - 4px)',
+      },
+      fontFamily: {
+        sans: ['var(--font-sans)', 'system-ui', 'sans-serif'],
+        heading: ['var(--font-heading)', 'system-ui', 'sans-serif'],
+      },
+    },
+  },
+  plugins: [],
+}
diff --git a/examples/react/calendar/tsconfig.json b/examples/react/calendar/tsconfig.json
new file mode 100644
index 00000000..ed36da15
--- /dev/null
+++ b/examples/react/calendar/tsconfig.json
@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "lib": ["DOM", "DOM.Iterable", "ESNext"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    "moduleResolution": "Bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["./src/*"]
+    }
+  },
+  "include": ["src", "vite.config.ts"]
+}
diff --git a/examples/react/calendar/vite.config.ts b/examples/react/calendar/vite.config.ts
new file mode 100644
index 00000000..711b04a3
--- /dev/null
+++ b/examples/react/calendar/vite.config.ts
@@ -0,0 +1,12 @@
+import path from 'path'
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
+})
diff --git a/examples/react/timeline/components.json b/examples/react/timeline/components.json
new file mode 100644
index 00000000..5e8cc891
--- /dev/null
+++ b/examples/react/timeline/components.json
@@ -0,0 +1,20 @@
+{
+  "$schema": "https://ui.shadcn.com/schema.json",
+  "style": "default",
+  "rsc": false,
+  "tsx": true,
+  "tailwind": {
+    "config": "tailwind.config.js",
+    "css": "src/index.css",
+    "baseColor": "neutral",
+    "cssVariables": true,
+    "prefix": ""
+  },
+  "aliases": {
+    "components": "@/components",
+    "utils": "@/lib/utils",
+    "ui": "@/components/ui",
+    "lib": "@/lib",
+    "hooks": "@/hooks"
+  }
+}
diff --git a/examples/react/timeline/index.html b/examples/react/timeline/index.html
new file mode 100644
index 00000000..c316addf
--- /dev/null
+++ b/examples/react/timeline/index.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#0a0a0a" />
+    <title>TanStack Time - React Timeline Example</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <script type="module" src="/src/index.tsx"></script>
+  </body>
+</html>
diff --git a/examples/react/timeline/package.json b/examples/react/timeline/package.json
new file mode 100644
index 00000000..1f6fb697
--- /dev/null
+++ b/examples/react/timeline/package.json
@@ -0,0 +1,46 @@
+{
+  "name": "@tanstack/time-example-react-timeline",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite --port=3006",
+    "build": "vite build",
+    "preview": "vite preview",
+    "test:types": "tsc"
+  },
+  "dependencies": {
+    "@dnd-kit/react": "^0.3.2",
+    "@radix-ui/react-dialog": "^1.1.15",
+    "@radix-ui/react-icons": "^1.3.2",
+    "@radix-ui/react-label": "^2.1.8",
+    "@radix-ui/react-scroll-area": "^1.2.10",
+    "@radix-ui/react-select": "^2.2.6",
+    "@radix-ui/react-slot": "^1.2.4",
+    "@radix-ui/react-tooltip": "^1.2.8",
+    "@tanstack/react-devtools": "^0.9.5",
+    "@tanstack/react-query": "^5.95.2",
+    "@tanstack/react-query-devtools": "^5.95.2",
+    "@tanstack/react-time": "^0.0.0",
+    "@tanstack/react-time-devtools": "^0.0.0",
+    "@tanstack/react-virtual": "^3.13.24",
+    "@tanstack/time": "^0.0.0",
+    "@xyflow/react": "^12.10.1",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-react": "^1.8.0",
+    "react": "^19.2.3",
+    "react-dom": "^19.2.3",
+    "tailwind-merge": "^3.5.0",
+    "tailwindcss-animate": "^1.0.7"
+  },
+  "devDependencies": {
+    "@types/react": "^19.2.8",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^5.1.2",
+    "autoprefixer": "^10.4.20",
+    "postcss": "^8.4.49",
+    "tailwindcss": "^3.4.17",
+    "typescript": "5.9.3",
+    "vite": "^7.3.1"
+  }
+}
diff --git a/examples/react/timeline/postcss.config.js b/examples/react/timeline/postcss.config.js
new file mode 100644
index 00000000..2e7af2b7
--- /dev/null
+++ b/examples/react/timeline/postcss.config.js
@@ -0,0 +1,6 @@
+export default {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}
diff --git a/examples/react/timeline/src/components/ui/badge.tsx b/examples/react/timeline/src/components/ui/badge.tsx
new file mode 100644
index 00000000..7af8af0f
--- /dev/null
+++ b/examples/react/timeline/src/components/ui/badge.tsx
@@ -0,0 +1,43 @@
+import * as React from 'react'
+import { Slot } from '@radix-ui/react-slot'
+import { cva, type VariantProps } from 'class-variance-authority'
+
+import { cn } from '@/lib/utils'
+
+const badgeVariants = cva(
+  'inline-flex items-center justify-center rounded-md border px-2 py-0.5 text-xs font-medium w-fit whitespace-nowrap shrink-0 [&>svg]:size-3 gap-1 [&>svg]:pointer-events-none transition-[color,box-shadow] overflow-hidden',
+  {
+    variants: {
+      variant: {
+        default:
+          'border-transparent bg-primary text-primary-foreground shadow-sm',
+        secondary: 'border-transparent bg-secondary text-secondary-foreground',
+        destructive:
+          'border-transparent bg-destructive text-destructive-foreground shadow-sm',
+        outline: 'text-foreground',
+      },
+    },
+    defaultVariants: {
+      variant: 'default',
+    },
+  },
+)
+
+function Badge({
+  className,
+  variant,
+  asChild = false,
+  ...props
+}: React.ComponentProps<'span'> &
+  VariantProps<typeof badgeVariants> & { asChild?: boolean }) {
+  const Comp = asChild ? Slot : 'span'
+  return (
+    <Comp
+      data-slot="badge"
+      className={cn(badgeVariants({ variant }), className)}
+      {...props}
+    />
+  )
+}
+
+export { Badge, badgeVariants }
diff --git a/examples/react/timeline/src/components/ui/button.tsx b/examples/react/timeline/src/components/ui/button.tsx
new file mode 100644
index 00000000..d08cc970
--- /dev/null
+++ b/examples/react/timeline/src/components/ui/button.tsx
@@ -0,0 +1,58 @@
+import * as React from 'react'
+import { Slot } from '@radix-ui/react-slot'
+import { cva, type VariantProps } from 'class-variance-authority'
+
+import { cn } from '@/lib/utils'
+
+const buttonVariants = cva(
+  'inline-flex items-center justify-center whitespace-nowrap rounded-md text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-50',
+  {
+    variants: {
+      variant: {
+        default:
+          'bg-primary text-primary-foreground shadow hover:bg-primary/90',
+        destructive:
+          'bg-destructive text-destructive-foreground shadow-sm hover:bg-destructive/90',
+        outline:
+          'border border-input bg-background shadow-sm hover:bg-accent hover:text-accent-foreground',
+        secondary:
+          'bg-secondary text-secondary-foreground shadow-sm hover:bg-secondary/80',
+        ghost: 'hover:bg-accent hover:text-accent-foreground',
+        link: 'text-primary underline-offset-4 hover:underline',
+      },
+      size: {
+        default: 'h-9 px-4 py-2',
+        sm: 'h-8 rounded-md px-3 text-xs',
+        lg: 'h-10 rounded-md px-8',
+        icon: 'h-9 w-9',
+      },
+    },
+    defaultVariants: {
+      variant: 'default',
+      size: 'default',
+    },
+  },
+)
+
+export interface ButtonProps
+  extends
+    React.ButtonHTMLAttributes<HTMLButtonElement>,
+    VariantProps<typeof buttonVariants> {
+  asChild?: boolean
+}
+
+const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, variant, size, asChild = false, ...props }, ref) => {
+    const Comp = asChild ? Slot : 'button'
+    return (
+      <Comp
+        className={cn(buttonVariants({ variant, size, className }))}
+        ref={ref}
+        {...props}
+      />
+    )
+  },
+)
+Button.displayName = 'Button'
+
+export { Button, buttonVariants }
diff --git a/examples/react/timeline/src/components/ui/card.tsx b/examples/react/timeline/src/components/ui/card.tsx
new file mode 100644
index 00000000..64566988
--- /dev/null
+++ b/examples/react/timeline/src/components/ui/card.tsx
@@ -0,0 +1,76 @@
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+const Card = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div
+    ref={ref}
+    className={cn(
+      'rounded-xl border bg-card text-card-foreground shadow',
+      className,
+    )}
+    {...props}
+  />
+))
+Card.displayName = 'Card'
+
+const CardHeader = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div
+    ref={ref}
+    className={cn('flex flex-col space-y-1.5 p-6', className)}
+    {...props}
+  />
+))
+CardHeader.displayName = 'CardHeader'
+
+const CardTitle = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div
+    ref={ref}
+    className={cn('font-semibold leading-none tracking-tight', className)}
+    {...props}
+  />
+))
+CardTitle.displayName = 'CardTitle'
+
+const CardDescription = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div
+    ref={ref}
+    className={cn('text-sm text-muted-foreground', className)}
+    {...props}
+  />
+))
+CardDescription.displayName = 'CardDescription'
+
+const CardContent = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div ref={ref} className={cn('p-6 pt-0', className)} {...props} />
+))
+CardContent.displayName = 'CardContent'
+
+const CardFooter = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div
+    ref={ref}
+    className={cn('flex items-center p-6 pt-0', className)}
+    {...props}
+  />
+))
+CardFooter.displayName = 'CardFooter'
+
+export { Card, CardHeader, CardFooter, CardTitle, CardDescription, CardContent }
diff --git a/examples/react/timeline/src/components/ui/dialog.tsx b/examples/react/timeline/src/components/ui/dialog.tsx
new file mode 100644
index 00000000..9af9a914
--- /dev/null
+++ b/examples/react/timeline/src/components/ui/dialog.tsx
@@ -0,0 +1,120 @@
+import * as React from 'react'
+import * as DialogPrimitive from '@radix-ui/react-dialog'
+import { X } from 'lucide-react'
+
+import { cn } from '@/lib/utils'
+
+const Dialog = DialogPrimitive.Root
+
+const DialogTrigger = DialogPrimitive.Trigger
+
+const DialogPortal = DialogPrimitive.Portal
+
+const DialogClose = DialogPrimitive.Close
+
+const DialogOverlay = React.forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Overlay>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Overlay>
+>(({ className, ...props }, ref) => (
+  <DialogPrimitive.Overlay
+    ref={ref}
+    className={cn(
+      'fixed inset-0 z-50 bg-black/80 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0',
+      className,
+    )}
+    {...props}
+  />
+))
+DialogOverlay.displayName = DialogPrimitive.Overlay.displayName
+
+const DialogContent = React.forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Content>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Content>
+>(({ className, children, ...props }, ref) => (
+  <DialogPortal>
+    <DialogOverlay />
+    <DialogPrimitive.Content
+      ref={ref}
+      className={cn(
+        'fixed left-[50%] top-[50%] z-50 grid w-full max-w-lg translate-x-[-50%] translate-y-[-50%] gap-4 border bg-background p-6 shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%] data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%] sm:rounded-lg',
+        className,
+      )}
+      {...props}
+    >
+      {children}
+      <DialogPrimitive.Close className="absolute right-4 top-4 rounded-sm opacity-70 ring-offset-background transition-opacity hover:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none data-[state=open]:bg-accent data-[state=open]:text-muted-foreground">
+        <X className="h-4 w-4" />
+        <span className="sr-only">Close</span>
+      </DialogPrimitive.Close>
+    </DialogPrimitive.Content>
+  </DialogPortal>
+))
+DialogContent.displayName = DialogPrimitive.Content.displayName
+
+const DialogHeader = ({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) => (
+  <div
+    className={cn(
+      'flex flex-col space-y-1.5 text-center sm:text-left',
+      className,
+    )}
+    {...props}
+  />
+)
+DialogHeader.displayName = 'DialogHeader'
+
+const DialogFooter = ({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) => (
+  <div
+    className={cn(
+      'flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-2',
+      className,
+    )}
+    {...props}
+  />
+)
+DialogFooter.displayName = 'DialogFooter'
+
+const DialogTitle = React.forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Title>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Title>
+>(({ className, ...props }, ref) => (
+  <DialogPrimitive.Title
+    ref={ref}
+    className={cn(
+      'text-lg font-semibold leading-none tracking-tight',
+      className,
+    )}
+    {...props}
+  />
+))
+DialogTitle.displayName = DialogPrimitive.Title.displayName
+
+const DialogDescription = React.forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Description>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Description>
+>(({ className, ...props }, ref) => (
+  <DialogPrimitive.Description
+    ref={ref}
+    className={cn('text-sm text-muted-foreground', className)}
+    {...props}
+  />
+))
+DialogDescription.displayName = DialogPrimitive.Description.displayName
+
+export {
+  Dialog,
+  DialogPortal,
+  DialogOverlay,
+  DialogTrigger,
+  DialogClose,
+  DialogContent,
+  DialogHeader,
+  DialogFooter,
+  DialogTitle,
+  DialogDescription,
+}
diff --git a/examples/react/timeline/src/components/ui/input.tsx b/examples/react/timeline/src/components/ui/input.tsx
new file mode 100644
index 00000000..6c738ffc
--- /dev/null
+++ b/examples/react/timeline/src/components/ui/input.tsx
@@ -0,0 +1,22 @@
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+const Input = React.forwardRef<HTMLInputElement, React.ComponentProps<'input'>>(
+  ({ className, type, ...props }, ref) => {
+    return (
+      <input
+        type={type}
+        className={cn(
+          'flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-base shadow-sm transition-colors file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:cursor-not-allowed disabled:opacity-50 md:text-sm',
+          className,
+        )}
+        ref={ref}
+        {...props}
+      />
+    )
+  },
+)
+Input.displayName = 'Input'
+
+export { Input }
diff --git a/examples/react/timeline/src/components/ui/label.tsx b/examples/react/timeline/src/components/ui/label.tsx
new file mode 100644
index 00000000..586e08e9
--- /dev/null
+++ b/examples/react/timeline/src/components/ui/label.tsx
@@ -0,0 +1,24 @@
+import * as React from 'react'
+import * as LabelPrimitive from '@radix-ui/react-label'
+import { cva, type VariantProps } from 'class-variance-authority'
+
+import { cn } from '@/lib/utils'
+
+const labelVariants = cva(
+  'text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70',
+)
+
+const Label = React.forwardRef<
+  React.ElementRef<typeof LabelPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof LabelPrimitive.Root> &
+    VariantProps<typeof labelVariants>
+>(({ className, ...props }, ref) => (
+  <LabelPrimitive.Root
+    ref={ref}
+    className={cn(labelVariants(), className)}
+    {...props}
+  />
+))
+Label.displayName = LabelPrimitive.Root.displayName
+
+export { Label }
diff --git a/examples/react/timeline/src/components/ui/scroll-area.tsx b/examples/react/timeline/src/components/ui/scroll-area.tsx
new file mode 100644
index 00000000..1e50773e
--- /dev/null
+++ b/examples/react/timeline/src/components/ui/scroll-area.tsx
@@ -0,0 +1,53 @@
+import * as React from 'react'
+import * as ScrollAreaPrimitive from '@radix-ui/react-scroll-area'
+
+import { cn } from '@/lib/utils'
+
+const ScrollArea = React.forwardRef<
+  React.ElementRef<typeof ScrollAreaPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof ScrollAreaPrimitive.Root> & {
+    viewportRef?: React.Ref<HTMLDivElement>
+    viewportClassName?: string
+  }
+>(({ className, children, viewportRef, viewportClassName, ...props }, ref) => (
+  <ScrollAreaPrimitive.Root
+    ref={ref}
+    className={cn('relative overflow-hidden', className)}
+    {...props}
+  >
+    <ScrollAreaPrimitive.Viewport
+      ref={viewportRef}
+      className={cn('h-full w-full rounded-[inherit]', viewportClassName)}
+    >
+      {children}
+    </ScrollAreaPrimitive.Viewport>
+    <ScrollBar orientation="horizontal" />
+    <ScrollBar orientation="vertical" />
+    <ScrollAreaPrimitive.Corner />
+  </ScrollAreaPrimitive.Root>
+))
+ScrollArea.displayName = ScrollAreaPrimitive.Root.displayName
+
+const ScrollBar = React.forwardRef<
+  React.ElementRef<typeof ScrollAreaPrimitive.ScrollAreaScrollbar>,
+  React.ComponentPropsWithoutRef<typeof ScrollAreaPrimitive.ScrollAreaScrollbar>
+>(({ className, orientation = 'vertical', ...props }, ref) => (
+  <ScrollAreaPrimitive.ScrollAreaScrollbar
+    ref={ref}
+    orientation={orientation}
+    className={cn(
+      'flex touch-none select-none transition-colors',
+      orientation === 'vertical' &&
+        'h-full w-2.5 border-l border-l-transparent p-[1px]',
+      orientation === 'horizontal' &&
+        'h-2.5 flex-col border-t border-t-transparent p-[1px]',
+      className,
+    )}
+    {...props}
+  >
+    <ScrollAreaPrimitive.ScrollAreaThumb className="relative flex-1 rounded-full bg-border" />
+  </ScrollAreaPrimitive.ScrollAreaScrollbar>
+))
+ScrollBar.displayName = ScrollAreaPrimitive.ScrollAreaScrollbar.displayName
+
+export { ScrollArea, ScrollBar }
diff --git a/examples/react/timeline/src/components/ui/select.tsx b/examples/react/timeline/src/components/ui/select.tsx
new file mode 100644
index 00000000..b24841d2
--- /dev/null
+++ b/examples/react/timeline/src/components/ui/select.tsx
@@ -0,0 +1,162 @@
+import * as React from 'react'
+import {
+  CaretSortIcon,
+  CheckIcon,
+  ChevronDownIcon,
+  ChevronUpIcon,
+} from '@radix-ui/react-icons'
+import * as SelectPrimitive from '@radix-ui/react-select'
+
+import { cn } from '@/lib/utils'
+
+const Select = SelectPrimitive.Root
+
+const SelectGroup = SelectPrimitive.Group
+
+const SelectValue = SelectPrimitive.Value
+
+const SelectTrigger = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.Trigger>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Trigger>
+>(({ className, children, ...props }, ref) => (
+  <SelectPrimitive.Trigger
+    ref={ref}
+    className={cn(
+      'flex h-9 w-full items-center justify-between whitespace-nowrap rounded-md border border-input bg-transparent px-3 py-2 text-sm shadow-sm ring-offset-background placeholder:text-muted-foreground focus:outline-none focus:ring-1 focus:ring-ring disabled:cursor-not-allowed disabled:opacity-50 [&>span]:line-clamp-1',
+      className,
+    )}
+    {...props}
+  >
+    {children}
+    <SelectPrimitive.Icon asChild>
+      <CaretSortIcon className="h-4 w-4 opacity-50" />
+    </SelectPrimitive.Icon>
+  </SelectPrimitive.Trigger>
+))
+SelectTrigger.displayName = SelectPrimitive.Trigger.displayName
+
+const SelectScrollUpButton = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.ScrollUpButton>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.ScrollUpButton>
+>(({ className, ...props }, ref) => (
+  <SelectPrimitive.ScrollUpButton
+    ref={ref}
+    className={cn(
+      'flex cursor-default items-center justify-center py-1',
+      className,
+    )}
+    {...props}
+  >
+    <ChevronUpIcon />
+  </SelectPrimitive.ScrollUpButton>
+))
+SelectScrollUpButton.displayName = SelectPrimitive.ScrollUpButton.displayName
+
+const SelectScrollDownButton = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.ScrollDownButton>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.ScrollDownButton>
+>(({ className, ...props }, ref) => (
+  <SelectPrimitive.ScrollDownButton
+    ref={ref}
+    className={cn(
+      'flex cursor-default items-center justify-center py-1',
+      className,
+    )}
+    {...props}
+  >
+    <ChevronDownIcon />
+  </SelectPrimitive.ScrollDownButton>
+))
+SelectScrollDownButton.displayName =
+  SelectPrimitive.ScrollDownButton.displayName
+
+const SelectContent = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.Content>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Content>
+>(({ className, children, position = 'popper', ...props }, ref) => (
+  <SelectPrimitive.Portal>
+    <SelectPrimitive.Content
+      ref={ref}
+      className={cn(
+        'relative z-50 max-h-96 min-w-[8rem] overflow-hidden rounded-md border bg-popover text-popover-foreground shadow-md data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2',
+        position === 'popper' &&
+          'data-[side=bottom]:translate-y-1 data-[side=left]:-translate-x-1 data-[side=right]:translate-x-1 data-[side=top]:-translate-y-1',
+        className,
+      )}
+      position={position}
+      {...props}
+    >
+      <SelectScrollUpButton />
+      <SelectPrimitive.Viewport
+        className={cn(
+          'p-1',
+          position === 'popper' &&
+            'h-[var(--radix-select-trigger-height)] w-full min-w-[var(--radix-select-trigger-width)]',
+        )}
+      >
+        {children}
+      </SelectPrimitive.Viewport>
+      <SelectScrollDownButton />
+    </SelectPrimitive.Content>
+  </SelectPrimitive.Portal>
+))
+SelectContent.displayName = SelectPrimitive.Content.displayName
+
+const SelectLabel = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.Label>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Label>
+>(({ className, ...props }, ref) => (
+  <SelectPrimitive.Label
+    ref={ref}
+    className={cn('px-2 py-1.5 text-sm font-semibold', className)}
+    {...props}
+  />
+))
+SelectLabel.displayName = SelectPrimitive.Label.displayName
+
+const SelectItem = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.Item>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Item>
+>(({ className, children, ...props }, ref) => (
+  <SelectPrimitive.Item
+    ref={ref}
+    className={cn(
+      'relative flex w-full cursor-default select-none items-center rounded-sm py-1.5 pl-2 pr-8 text-sm outline-none focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50',
+      className,
+    )}
+    {...props}
+  >
+    <span className="absolute right-2 flex h-3.5 w-3.5 items-center justify-center">
+      <SelectPrimitive.ItemIndicator>
+        <CheckIcon className="h-4 w-4" />
+      </SelectPrimitive.ItemIndicator>
+    </span>
+    <SelectPrimitive.ItemText>{children}</SelectPrimitive.ItemText>
+  </SelectPrimitive.Item>
+))
+SelectItem.displayName = SelectPrimitive.Item.displayName
+
+const SelectSeparator = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.Separator>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Separator>
+>(({ className, ...props }, ref) => (
+  <SelectPrimitive.Separator
+    ref={ref}
+    className={cn('-mx-1 my-1 h-px bg-muted', className)}
+    {...props}
+  />
+))
+SelectSeparator.displayName = SelectPrimitive.Separator.displayName
+
+export {
+  Select,
+  SelectGroup,
+  SelectValue,
+  SelectTrigger,
+  SelectContent,
+  SelectLabel,
+  SelectItem,
+  SelectSeparator,
+  SelectScrollUpButton,
+  SelectScrollDownButton,
+}
diff --git a/examples/react/timeline/src/components/ui/tooltip.tsx b/examples/react/timeline/src/components/ui/tooltip.tsx
new file mode 100644
index 00000000..53f276ae
--- /dev/null
+++ b/examples/react/timeline/src/components/ui/tooltip.tsx
@@ -0,0 +1,28 @@
+import * as React from 'react'
+import * as TooltipPrimitive from '@radix-ui/react-tooltip'
+
+import { cn } from '@/lib/utils'
+
+const TooltipProvider = TooltipPrimitive.Provider
+
+const Tooltip = TooltipPrimitive.Root
+
+const TooltipTrigger = TooltipPrimitive.Trigger
+
+const TooltipContent = React.forwardRef<
+  React.ElementRef<typeof TooltipPrimitive.Content>,
+  React.ComponentPropsWithoutRef<typeof TooltipPrimitive.Content>
+>(({ className, sideOffset = 4, ...props }, ref) => (
+  <TooltipPrimitive.Content
+    ref={ref}
+    sideOffset={sideOffset}
+    className={cn(
+      'z-50 overflow-hidden rounded-md bg-primary px-3 py-1.5 text-xs text-primary-foreground animate-in fade-in-0 zoom-in-95 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2',
+      className,
+    )}
+    {...props}
+  />
+))
+TooltipContent.displayName = TooltipPrimitive.Content.displayName
+
+export { Tooltip, TooltipTrigger, TooltipContent, TooltipProvider }
diff --git a/examples/react/timeline/src/index.css b/examples/react/timeline/src/index.css
new file mode 100644
index 00000000..7e49446b
--- /dev/null
+++ b/examples/react/timeline/src/index.css
@@ -0,0 +1,119 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer base {
+  :root {
+    --background: 0 0% 0%;
+    --foreground: 0 0% 98%;
+    --card: 0 0% 3%;
+    --card-foreground: 0 0% 98%;
+    --popover: 0 0% 3%;
+    --popover-foreground: 0 0% 98%;
+    --primary: 0 0% 98%;
+    --primary-foreground: 0 0% 9%;
+    --secondary: 0 0% 14.9%;
+    --secondary-foreground: 0 0% 98%;
+    --muted: 0 0% 14.9%;
+    --muted-foreground: 0 0% 63.9%;
+    --accent: 0 0% 14.9%;
+    --accent-foreground: 0 0% 98%;
+    --destructive: 0 62.8% 30.6%;
+    --destructive-foreground: 0 0% 98%;
+    --border: 0 0% 14.9%;
+    --input: 0 0% 14.9%;
+    --ring: 0 0% 83.1%;
+    --radius: 0.5rem;
+  }
+
+  .dark {
+    --background: 0 0% 0%;
+    --foreground: 0 0% 98%;
+    --card: 0 0% 3%;
+    --card-foreground: 0 0% 98%;
+    --popover: 0 0% 3%;
+    --popover-foreground: 0 0% 98%;
+    --primary: 0 0% 98%;
+    --primary-foreground: 0 0% 9%;
+    --secondary: 0 0% 14.9%;
+    --secondary-foreground: 0 0% 98%;
+    --muted: 0 0% 14.9%;
+    --muted-foreground: 0 0% 63.9%;
+    --accent: 0 0% 14.9%;
+    --accent-foreground: 0 0% 98%;
+    --destructive: 0 62.8% 30.6%;
+    --destructive-foreground: 0 0% 98%;
+    --border: 0 0% 14.9%;
+    --input: 0 0% 14.9%;
+    --ring: 0 0% 83.1%;
+  }
+}
+
+@layer base {
+  * {
+    border-color: hsl(var(--border));
+  }
+  body {
+    background-color: hsl(var(--background));
+    color: hsl(var(--foreground));
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+  }
+}
+
+@layer utilities {
+  .bg-background {
+    background-color: hsl(var(--background));
+  }
+  .text-foreground {
+    color: hsl(var(--foreground));
+  }
+  .bg-card {
+    background-color: hsl(var(--card));
+  }
+  .text-card-foreground {
+    color: hsl(var(--card-foreground));
+  }
+  .bg-popover {
+    background-color: hsl(var(--popover));
+  }
+  .text-popover-foreground {
+    color: hsl(var(--popover-foreground));
+  }
+  .bg-primary {
+    background-color: hsl(var(--primary));
+  }
+  .text-primary-foreground {
+    color: hsl(var(--primary-foreground));
+  }
+  .bg-secondary {
+    background-color: hsl(var(--secondary));
+  }
+  .text-secondary-foreground {
+    color: hsl(var(--secondary-foreground));
+  }
+  .text-muted-foreground {
+    color: hsl(var(--muted-foreground));
+  }
+  .bg-accent {
+    background-color: hsl(var(--accent));
+  }
+  .text-accent-foreground {
+    color: hsl(var(--accent-foreground));
+  }
+  .bg-destructive {
+    background-color: hsl(var(--destructive));
+  }
+  .text-destructive-foreground {
+    color: hsl(var(--destructive-foreground));
+  }
+  .border-border {
+    border-color: hsl(var(--border));
+  }
+  .bg-input {
+    background-color: hsl(var(--input));
+  }
+  .ring-ring {
+    --tw-ring-color: hsl(var(--ring));
+  }
+}
diff --git a/examples/react/timeline/src/index.tsx b/examples/react/timeline/src/index.tsx
new file mode 100644
index 00000000..9b38952f
--- /dev/null
+++ b/examples/react/timeline/src/index.tsx
@@ -0,0 +1,2232 @@
+import {
+  calculateTimelineResizePreview,
+  useCalendar,
+} from '@tanstack/react-time'
+import { TanStackDevtools } from '@tanstack/react-devtools'
+import { timeDevtoolsPlugin } from '@tanstack/react-time-devtools'
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+import {
+  getTimeClient,
+  toPlainDateString,
+  toPlainDateTimeString,
+  toPlainTimeString,
+} from '@tanstack/time'
+import {
+  DragDropProvider,
+  DragOverlay,
+  useDraggable,
+  useDroppable,
+} from '@dnd-kit/react'
+import {
+  Handle,
+  MarkerType,
+  Position,
+  ReactFlow,
+  useEdgesState,
+  useNodesState,
+} from '@xyflow/react'
+import '@xyflow/react/dist/style.css'
+import ReactDOM from 'react-dom/client'
+import React, {
+  useCallback,
+  useEffect,
+  useLayoutEffect,
+  useMemo,
+  useRef,
+  useState,
+} from 'react'
+import { ReactQueryDevtoolsPanel } from '@tanstack/react-query-devtools'
+import { useVirtualizer } from '@tanstack/react-virtual'
+import { X } from 'lucide-react'
+
+import type {
+  Day,
+  DependencyType,
+  Event,
+  ResizeError,
+  Resource,
+  TimelineLayout,
+  TimelineResourceRow,
+} from '@tanstack/time'
+import type { Connection, Edge, Node, NodeProps } from '@xyflow/react'
+
+import { Button } from '@/components/ui/button'
+import { ScrollArea } from '@/components/ui/scroll-area'
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '@/components/ui/select'
+import { Badge } from '@/components/ui/badge'
+import { Card, CardContent } from '@/components/ui/card'
+
+import './index.css'
+
+const DEP_TYPE_STYLES: Record<
+  DependencyType,
+  {
+    label: string
+    description: string
+    color: string
+    strokeDasharray?: string
+    badgeBg: string
+  }
+> = {
+  FS: {
+    label: 'FS',
+    description: 'Finish → Start (successor starts after predecessor ends)',
+    color: '#f59e0b',
+    badgeBg: 'bg-amber-500',
+  },
+  SS: {
+    label: 'SS',
+    description: 'Start → Start (successor starts after predecessor starts)',
+    color: '#3b82f6',
+    strokeDasharray: '6 4',
+    badgeBg: 'bg-blue-500',
+  },
+  FF: {
+    label: 'FF',
+    description: 'Finish → Finish (successor ends after predecessor ends)',
+    color: '#10b981',
+    strokeDasharray: '6 4',
+    badgeBg: 'bg-emerald-500',
+  },
+  SF: {
+    label: 'SF',
+    description: 'Start → Finish (successor ends after predecessor starts)',
+    color: '#a855f7',
+    strokeDasharray: '2 3',
+    badgeBg: 'bg-purple-500',
+  },
+}
+
+const ALL_DEP_TYPES: Array<DependencyType> = ['FS', 'SS', 'FF', 'SF']
+
+const EVENT_COLORS = [
+  {
+    bg: 'bg-indigo-500/80',
+    border: 'border-indigo-400',
+    text: 'text-indigo-50',
+  },
+  {
+    bg: 'bg-emerald-500/80',
+    border: 'border-emerald-400',
+    text: 'text-emerald-50',
+  },
+  { bg: 'bg-amber-500/80', border: 'border-amber-400', text: 'text-amber-50' },
+  { bg: 'bg-rose-500/80', border: 'border-rose-400', text: 'text-rose-50' },
+  { bg: 'bg-cyan-500/80', border: 'border-cyan-400', text: 'text-cyan-50' },
+  {
+    bg: 'bg-violet-500/80',
+    border: 'border-violet-400',
+    text: 'text-violet-50',
+  },
+  {
+    bg: 'bg-orange-500/80',
+    border: 'border-orange-400',
+    text: 'text-orange-50',
+  },
+  { bg: 'bg-teal-500/80', border: 'border-teal-400', text: 'text-teal-50' },
+]
+
+const RESOURCE_ZONE_COLORS = [
+  '#6366f155',
+  '#10b98155',
+  '#f59e0b55',
+  '#f43f5e55',
+  '#06b6d455',
+]
+
+const resourceDesign: Resource = {
+  id: 'design',
+  label: 'Design',
+  availability: [
+    { weekdays: [1, 2, 3, 4], startTime: '09:00', endTime: '17:00' },
+    { weekdays: [5], startTime: '09:00', endTime: '13:00' },
+  ],
+}
+const resourceFrontend: Resource = {
+  id: 'frontend',
+  label: 'Frontend',
+  availability: [
+    { weekdays: [1, 2, 3, 4], startTime: '08:00', endTime: '24:00' },
+    { weekdays: [5], startTime: '08:00', endTime: '24:00' },
+  ],
+}
+const resourceBackend: Resource = {
+  id: 'backend',
+  label: 'Backend',
+  capacity: [2, 3, 5],
+  availability: [
+    { weekdays: [1, 2, 3], startTime: '10:00', endTime: '19:00' },
+    { weekdays: [4, 5], startTime: '00:00', endTime: '24:00' },
+  ],
+}
+const resourceQA: Resource = {
+  id: 'qa',
+  label: 'QA',
+  availability: [
+    { weekdays: [1, 2, 3], startTime: '09:00', endTime: '17:00' },
+    { weekdays: [4, 5], startTime: '10:00', endTime: '15:00' },
+  ],
+}
+const resourceDevOps: Resource = {
+  id: 'devops',
+  label: 'DevOps',
+  availability: [
+    { weekdays: [1, 2, 3, 4, 5], startTime: '07:00', endTime: '16:00' },
+    { weekdays: [6, 7], startTime: '10:00', endTime: '14:00' },
+  ],
+}
+
+const sampleResources: Array<Resource> = [
+  resourceDesign,
+  resourceFrontend,
+  resourceBackend,
+  resourceQA,
+  resourceDevOps,
+]
+
+function workWeekMonday(): Date {
+  const today = new Date()
+  const day = today.getDay()
+  const monday = new Date(today)
+
+  if (day === 0 || day === 6) {
+    monday.setDate(today.getDate() + (day === 0 ? 1 : 2))
+  } else {
+    monday.setDate(today.getDate() + (1 - day))
+  }
+  monday.setHours(0, 0, 0, 0)
+  return monday
+}
+
+function weekdayAt(
+  isoWeekday: 1 | 2 | 3 | 4 | 5,
+  hour: number,
+  minute = 0,
+): Date {
+  const monday = workWeekMonday()
+  const date = new Date(monday)
+  date.setDate(monday.getDate() + isoWeekday - 1)
+  date.setHours(hour, minute, 0, 0)
+  return date
+}
+
+function getSampleEvents(): Array<Event<Resource>> {
+  return [
+    {
+      id: '1',
+      title: 'UI Mockups',
+      start: weekdayAt(1, 10, 0),
+      end: weekdayAt(1, 12, 30),
+      resources: [resourceDesign],
+    },
+    {
+      id: '2',
+      title: 'Component Library',
+      start: weekdayAt(2, 9, 0),
+      end: weekdayAt(2, 17, 0),
+      resources: [resourceFrontend],
+      dependsOn: [{ id: '1', type: 'FS' }],
+    },
+    {
+      id: '3',
+      title: 'API Development',
+      start: weekdayAt(2, 11, 0),
+      end: weekdayAt(2, 18, 0),
+      resources: [resourceBackend],
+      consumption: [3],
+      dependsOn: [{ id: '2', type: 'SS' }],
+    },
+    {
+      id: '4',
+      title: 'Database Schema',
+      start: weekdayAt(1, 11, 0),
+      end: weekdayAt(1, 16, 0),
+      resources: [resourceBackend],
+      consumption: [5],
+    },
+    {
+      id: '5',
+      title: 'Integration Tests',
+      start: weekdayAt(3, 10, 0),
+      end: weekdayAt(3, 15, 0),
+      resources: [resourceQA],
+      dependsOn: [{ id: '3', type: 'FF' }],
+    },
+    {
+      id: '6',
+      title: 'CI/CD Pipeline',
+      start: weekdayAt(1, 8, 0),
+      end: weekdayAt(1, 14, 0),
+      resources: [resourceDevOps],
+    },
+    {
+      id: '7',
+      title: 'Design Review',
+      start: weekdayAt(3, 10, 0),
+      end: weekdayAt(3, 12, 30),
+      resources: [resourceDesign],
+    },
+    {
+      id: '8',
+      title: 'Auth Module',
+      start: weekdayAt(5, 6, 0),
+      end: weekdayAt(5, 10, 0),
+      resources: [resourceBackend],
+    },
+    {
+      id: '9',
+      title: 'Load Testing',
+      start: weekdayAt(4, 10, 30),
+      end: weekdayAt(4, 14, 30),
+      resources: [resourceQA],
+      dependsOn: [{ id: '4', type: 'SF' }],
+    },
+    {
+      id: '10',
+      title: 'Deployment',
+      start: weekdayAt(5, 7, 30),
+      end: weekdayAt(5, 13, 0),
+      resources: [resourceDevOps],
+      dependsOn: [{ id: '8', type: 'FS' }],
+    },
+  ]
+}
+
+const MOCK_DB = getSampleEvents()
+
+function getEventColor(eventId: string) {
+  const hash = String(eventId)
+    .split('')
+    .reduce((acc, char) => acc + char.charCodeAt(0), 0)
+  const colorIdx = hash % EVENT_COLORS.length
+  return EVENT_COLORS[colorIdx] ?? EVENT_COLORS[0]
+}
+
+interface EventFormData {
+  title: string
+  startDate: string
+  startTime: string
+  endDate: string
+  endTime: string
+  resourceId: string
+  consumption: number
+  dependsOn: Array<{ id: string; type: DependencyType }>
+}
+
+const emptyFormData: EventFormData = {
+  title: '',
+  startDate: toPlainDateString(new Date()),
+  startTime: '09:00',
+  endDate: toPlainDateString(new Date()),
+  endTime: '10:00',
+  resourceId: resourceDesign.id,
+  consumption: 1,
+  dependsOn: [],
+}
+
+function DependencyTypeModal({
+  isOpen,
+  sourceTitle,
+  targetTitle,
+  onChoose,
+  onCancel,
+}: {
+  isOpen: boolean
+  sourceTitle: string
+  targetTitle: string
+  onChoose: (type: DependencyType) => void
+  onCancel: () => void
+}) {
+  return (
+    <Dialog open={isOpen} onOpenChange={(open) => !open && onCancel()}>
+      <DialogContent className="sm:max-w-md">
+        <DialogHeader>
+          <DialogTitle>Link dependency</DialogTitle>
+          <DialogDescription>
+            Choose how{' '}
+            <span className="font-semibold">&ldquo;{targetTitle}&rdquo;</span>{' '}
+            depends on{' '}
+            <span className="font-semibold">&ldquo;{sourceTitle}&rdquo;</span>.
+          </DialogDescription>
+        </DialogHeader>
+        <div className="grid grid-cols-1 gap-2 py-2">
+          {ALL_DEP_TYPES.map((type) => {
+            const style = DEP_TYPE_STYLES[type]
+            return (
+              <button
+                key={type}
+                type="button"
+                onClick={() => onChoose(type)}
+                className="group flex items-center gap-3 rounded-md border border-neutral-700 bg-neutral-900/40 px-3 py-2.5 text-left transition-colors hover:border-neutral-500 hover:bg-neutral-800/60 focus:outline-none focus:ring-2 focus:ring-neutral-500"
+              >
+                <span
+                  className={`${style.badgeBg} text-white text-xs font-bold rounded px-2 py-1 min-w-[2.5rem] text-center`}
+                >
+                  {style.label}
+                </span>
+                <span className="text-sm text-neutral-200">
+                  {style.description}
+                </span>
+              </button>
+            )
+          })}
+        </div>
+        <DialogFooter>
+          <Button variant="outline" onClick={onCancel}>
+            Cancel
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}
+
+function EventModal({
+  isOpen,
+  onClose,
+  onSave,
+  onDelete,
+  initialData,
+  mode,
+  isSaving,
+  allEvents,
+  editingEventId,
+}: {
+  isOpen: boolean
+  onClose: () => void
+  onSave: (data: EventFormData) => Promise<void>
+  onDelete?: () => void
+  initialData: EventFormData
+  mode: 'add' | 'edit'
+  isSaving?: boolean
+  allEvents: Array<Event<Resource>>
+  editingEventId?: string
+}) {
+  const [formData, setFormData] = useState<EventFormData>(initialData)
+
+  useEffect(() => {
+    setFormData(initialData)
+  }, [initialData, isOpen])
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault()
+    try {
+      await onSave(formData)
+    } catch {
+      return
+    }
+    onClose()
+  }
+
+  const dependableEvents = allEvents.filter((e) => e.id !== editingEventId)
+
+  const addDependency = () => {
+    const candidate = dependableEvents.find(
+      (e) => !formData.dependsOn.some((d) => d.id === e.id),
+    )
+    if (!candidate) return
+    setFormData({
+      ...formData,
+      dependsOn: [...formData.dependsOn, { id: candidate.id, type: 'FS' }],
+    })
+  }
+
+  const updateDependency = (
+    index: number,
+    patch: Partial<{ id: string; type: DependencyType }>,
+  ) => {
+    setFormData({
+      ...formData,
+      dependsOn: formData.dependsOn.map((d, i) =>
+        i === index ? { ...d, ...patch } : d,
+      ),
+    })
+  }
+
+  const removeDependency = (index: number) => {
+    setFormData({
+      ...formData,
+      dependsOn: formData.dependsOn.filter((_, i) => i !== index),
+    })
+  }
+
+  return (
+    <Dialog open={isOpen} onOpenChange={(open) => !open && onClose()}>
+      <DialogContent className="sm:max-w-lg">
+        <DialogHeader>
+          <DialogTitle>
+            {mode === 'add' ? 'Add Event' : 'Edit Event'}
+          </DialogTitle>
+          <DialogDescription>
+            {mode === 'add'
+              ? 'Create a new event on the timeline.'
+              : 'Make changes to your event here.'}
+          </DialogDescription>
+        </DialogHeader>
+        <form onSubmit={handleSubmit} className="space-y-4">
+          <div className="space-y-2">
+            <Label htmlFor="title">Title</Label>
+            <Input
+              id="title"
+              type="text"
+              value={formData.title}
+              onChange={(e) =>
+                setFormData({ ...formData, title: e.target.value })
+              }
+              placeholder="Event title"
+              required
+            />
+          </div>
+          <div className="grid grid-cols-2 gap-4">
+            <div className="space-y-2">
+              <Label htmlFor="resource">Resource</Label>
+              <Select
+                value={formData.resourceId}
+                onValueChange={(value) =>
+                  setFormData({ ...formData, resourceId: value })
+                }
+              >
+                <SelectTrigger id="resource">
+                  <SelectValue placeholder="Select a resource" />
+                </SelectTrigger>
+                <SelectContent>
+                  {sampleResources.map((r) => {
+                    const cap = r.capacity?.reduce((a, b) => a + b, 0)
+                    return (
+                      <SelectItem key={r.id} value={r.id}>
+                        {r.label}
+                        {cap ? ` (cap ${cap})` : ''}
+                      </SelectItem>
+                    )
+                  })}
+                </SelectContent>
+              </Select>
+            </div>
+            <div className="space-y-2">
+              <Label htmlFor="consumption">Consumption</Label>
+              <Input
+                id="consumption"
+                type="number"
+                min={1}
+                step={1}
+                value={formData.consumption}
+                onChange={(e) =>
+                  setFormData({
+                    ...formData,
+                    consumption: Math.max(1, Number(e.target.value) || 1),
+                  })
+                }
+                required
+              />
+            </div>
+          </div>
+          <div className="grid grid-cols-2 gap-4">
+            <div className="space-y-2">
+              <Label htmlFor="startDate">Start Date</Label>
+              <Input
+                id="startDate"
+                type="date"
+                value={formData.startDate}
+                onChange={(e) =>
+                  setFormData({ ...formData, startDate: e.target.value })
+                }
+                required
+              />
+            </div>
+            <div className="space-y-2">
+              <Label htmlFor="startTime">Start Time</Label>
+              <Input
+                id="startTime"
+                type="time"
+                value={formData.startTime}
+                onChange={(e) =>
+                  setFormData({ ...formData, startTime: e.target.value })
+                }
+                required
+              />
+            </div>
+            <div className="space-y-2">
+              <Label htmlFor="endDate">End Date</Label>
+              <Input
+                id="endDate"
+                type="date"
+                value={formData.endDate}
+                onChange={(e) =>
+                  setFormData({ ...formData, endDate: e.target.value })
+                }
+                required
+              />
+            </div>
+            <div className="space-y-2">
+              <Label htmlFor="endTime">End Time</Label>
+              <Input
+                id="endTime"
+                type="time"
+                value={formData.endTime}
+                onChange={(e) =>
+                  setFormData({ ...formData, endTime: e.target.value })
+                }
+                required
+              />
+            </div>
+          </div>
+
+          <div className="space-y-2">
+            <div className="flex items-center justify-between">
+              <Label>Dependencies</Label>
+              <Button
+                type="button"
+                variant="outline"
+                size="sm"
+                onClick={addDependency}
+                disabled={dependableEvents.length === 0}
+              >
+                + Add
+              </Button>
+            </div>
+            {formData.dependsOn.length === 0 ? (
+              <div className="text-xs text-neutral-500 italic">
+                No dependencies. Add one to constrain when this event can be
+                scheduled.
+              </div>
+            ) : (
+              <div className="space-y-2">
+                {formData.dependsOn.map((dep, idx) => (
+                  <div key={idx} className="flex items-center gap-2">
+                    <Select
+                      value={dep.id}
+                      onValueChange={(value) =>
+                        updateDependency(idx, { id: value })
+                      }
+                    >
+                      <SelectTrigger className="flex-1">
+                        <SelectValue />
+                      </SelectTrigger>
+                      <SelectContent>
+                        {dependableEvents.map((e) => (
+                          <SelectItem key={e.id} value={e.id}>
+                            {e.title}
+                          </SelectItem>
+                        ))}
+                      </SelectContent>
+                    </Select>
+                    <Select
+                      value={dep.type}
+                      onValueChange={(value) =>
+                        updateDependency(idx, {
+                          type: value as DependencyType,
+                        })
+                      }
+                    >
+                      <SelectTrigger className="w-24">
+                        <SelectValue />
+                      </SelectTrigger>
+                      <SelectContent>
+                        {ALL_DEP_TYPES.map((type) => (
+                          <SelectItem key={type} value={type}>
+                            {type}
+                          </SelectItem>
+                        ))}
+                      </SelectContent>
+                    </Select>
+                    <Button
+                      type="button"
+                      variant="ghost"
+                      size="icon"
+                      onClick={() => removeDependency(idx)}
+                    >
+                      <X className="h-4 w-4" />
+                    </Button>
+                  </div>
+                ))}
+              </div>
+            )}
+          </div>
+
+          <DialogFooter className="flex justify-between pt-4">
+            <div>
+              {mode === 'edit' && onDelete && (
+                <Button
+                  type="button"
+                  variant="destructive"
+                  onClick={() => {
+                    onDelete()
+                    onClose()
+                  }}
+                >
+                  Delete
+                </Button>
+              )}
+            </div>
+            <div className="flex gap-2">
+              <Button type="button" variant="outline" onClick={onClose}>
+                Cancel
+              </Button>
+              <Button type="submit" disabled={isSaving}>
+                {isSaving ? 'Saving…' : mode === 'add' ? 'Add' : 'Save'}
+              </Button>
+            </div>
+          </DialogFooter>
+        </form>
+      </DialogContent>
+    </Dialog>
+  )
+}
+
+interface HorizontalResizeHandleProps {
+  edge: 'left' | 'right'
+  onMouseDown: (e: React.MouseEvent) => void
+}
+
+function HorizontalResizeHandle({
+  edge,
+  onMouseDown,
+}: HorizontalResizeHandleProps) {
+  return (
+    <div
+      data-resize-handle
+      className={`absolute top-0 bottom-0 w-3 cursor-ew-resize z-30 bg-transparent hover:bg-neutral-500/30 pointer-events-auto ${
+        edge === 'left' ? 'left-0' : 'right-0'
+      }`}
+      onMouseDown={onMouseDown}
+      onClick={(e) => {
+        e.stopPropagation()
+      }}
+      style={{ touchAction: 'none' }}
+    >
+      <div
+        className={`absolute top-1/2 -translate-y-1/2 h-8 w-1 bg-neutral-400 rounded opacity-50 group-hover:opacity-100 transition-opacity ${
+          edge === 'left' ? 'left-1' : 'right-1'
+        }`}
+      />
+    </div>
+  )
+}
+
+function ResizeErrorToast({
+  error,
+  onDismiss,
+}: {
+  error: ResizeError
+  onDismiss: () => void
+}) {
+  useEffect(() => {
+    const timer = setTimeout(onDismiss, 5000)
+    return () => clearTimeout(timer)
+  }, [onDismiss])
+
+  return (
+    <div className="fixed bottom-5 right-5 z-50 animate-in slide-in-from-bottom-2 fade-in duration-200">
+      <Card className="max-w-md border-destructive/50 bg-destructive/10">
+        <CardContent className="p-4">
+          <div className="flex items-start gap-3">
+            <div className="text-destructive text-lg">!</div>
+            <div className="flex-1 min-w-0">
+              <div className="font-semibold text-destructive-foreground mb-1">
+                Cannot Resize{' '}
+                <span className="italic">&ldquo;{error.eventTitle}&rdquo;</span>
+              </div>
+              <div className="text-sm text-destructive-foreground/80 mb-2">
+                {error.message}
+              </div>
+              {error.conflicts && error.conflicts.length > 0 && (
+                <div className="mt-2 space-y-1">
+                  <div className="text-xs text-destructive-foreground/70 font-medium uppercase tracking-wide">
+                    Dependency conflicts:
+                  </div>
+                  {error.conflicts.map((conflict, idx) => (
+                    <div
+                      key={idx}
+                      className="text-xs text-destructive-foreground/70 bg-destructive/20 rounded px-2 py-1.5 border border-destructive/30"
+                    >
+                      <div className="font-medium text-destructive-foreground/90">
+                        {conflict.date}{' '}
+                        <span className="text-destructive">
+                          {conflict.conflictRange.start}–
+                          {conflict.conflictRange.end}
+                        </span>
+                      </div>
+                      <div className="text-destructive-foreground/50 mt-0.5">
+                        {conflict.description}
+                      </div>
+                    </div>
+                  ))}
+                </div>
+              )}
+            </div>
+            <Button
+              variant="ghost"
+              size="icon"
+              onClick={onDismiss}
+              className="h-6 w-6 text-destructive/60 hover:text-destructive hover:bg-destructive/20"
+            >
+              <X className="h-4 w-4" />
+            </Button>
+          </div>
+        </CardContent>
+      </Card>
+    </div>
+  )
+}
+
+const EVENT_GAP_PX = 3
+const DEP_HANDLE_STYLE: React.CSSProperties = {
+  width: 10,
+  height: 10,
+  background: '#f59e0b',
+  border: '2px solid #78350f',
+  borderRadius: '50%',
+  pointerEvents: 'all',
+  cursor: 'crosshair',
+  opacity: 0.85,
+  zIndex: 40,
+}
+
+interface HandlePosition {
+  eventId: string
+  x: number
+  y: number
+  width: number
+  height: number
+}
+
+function DepCanvasNode({ data }: NodeProps) {
+  const { handlePositions } = data as { handlePositions: Array<HandlePosition> }
+  return (
+    <div
+      style={{
+        position: 'relative',
+        width: '100%',
+        height: '100%',
+        pointerEvents: 'none',
+      }}
+    >
+      {handlePositions.map(({ eventId, x, y, width, height }) => (
+        <React.Fragment key={eventId}>
+          <Handle
+            type="target"
+            position={Position.Left}
+            id={`${eventId}-target-start`}
+            style={{
+              ...DEP_HANDLE_STYLE,
+              position: 'absolute',
+              left: x,
+              right: 'auto',
+              top: y + height / 2,
+              bottom: 'auto',
+              transform: 'translate(-50%, -50%)',
+            }}
+          />
+          <Handle
+            type="source"
+            position={Position.Left}
+            id={`${eventId}-source-start`}
+            style={{
+              ...DEP_HANDLE_STYLE,
+              position: 'absolute',
+              left: x,
+              right: 'auto',
+              top: y + height / 2,
+              bottom: 'auto',
+              transform: 'translate(-50%, -50%)',
+              opacity: 0,
+            }}
+          />
+          <Handle
+            type="target"
+            position={Position.Right}
+            id={`${eventId}-target-end`}
+            style={{
+              ...DEP_HANDLE_STYLE,
+              position: 'absolute',
+              left: x + width,
+              right: 'auto',
+              top: y + height / 2,
+              bottom: 'auto',
+              transform: 'translate(-50%, -50%)',
+              opacity: 0,
+            }}
+          />
+          <Handle
+            type="source"
+            position={Position.Right}
+            id={`${eventId}-source-end`}
+            style={{
+              ...DEP_HANDLE_STYLE,
+              position: 'absolute',
+              left: x + width,
+              right: 'auto',
+              top: y + height / 2,
+              bottom: 'auto',
+              transform: 'translate(-50%, -50%)',
+            }}
+          />
+        </React.Fragment>
+      ))}
+    </div>
+  )
+}
+
+const DEP_CANVAS_NODE_TYPES = { depCanvas: DepCanvasNode }
+const CANVAS_NODE_ID = '__dep_canvas__'
+
+function buildTimelineEdges(events: Array<Event<Resource>>): Array<Edge> {
+  const visibleEventIds = new Set(events.map((e) => e.id))
+
+  return events.flatMap((event) => {
+    const deps = (event.dependsOn ?? []).filter((d) =>
+      visibleEventIds.has(d.id),
+    )
+
+    return deps.map((dep) => {
+      const style = DEP_TYPE_STYLES[dep.type]
+      const sourceAnchor =
+        dep.type === 'SS' || dep.type === 'SF' ? 'start' : 'end'
+      const targetAnchor =
+        dep.type === 'FF' || dep.type === 'SF' ? 'end' : 'start'
+      return {
+        id: `dep-${dep.id}-${event.id}-${dep.type}`,
+        source: CANVAS_NODE_ID,
+        sourceHandle: `${dep.id}-source-${sourceAnchor}`,
+        target: CANVAS_NODE_ID,
+        targetHandle: `${event.id}-target-${targetAnchor}`,
+        type: 'smoothstep',
+        animated: true,
+        label: dep.type,
+        labelStyle: {
+          fill: '#fff',
+          fontSize: 10,
+          fontWeight: 700,
+        },
+        labelBgStyle: {
+          fill: style.color,
+          opacity: 0.95,
+        },
+        labelBgPadding: [4, 2] as [number, number],
+        labelBgBorderRadius: 3,
+        markerEnd: { type: MarkerType.ArrowClosed, color: style.color },
+        style: {
+          stroke: style.color,
+          strokeWidth: 2,
+          strokeDasharray: style.strokeDasharray,
+        },
+      }
+    })
+  })
+}
+
+interface TimelineDependencyOverlayProps {
+  timelineLayout: TimelineLayout<Resource, Event<Resource>>
+  eventBarRefs: React.MutableRefObject<Map<string, HTMLDivElement>>
+  rowsContainerRef: React.RefObject<HTMLDivElement | null>
+  resizeState: {
+    isResizing: boolean
+    eventId: string | null
+    previewStart: string | null
+    previewEnd: string | null
+  }
+  activeDragEvent: any
+  onDependencyCreate: (
+    sourceId: string,
+    targetId: string,
+    sourceAnchor: 'start' | 'end',
+    targetAnchor: 'start' | 'end',
+  ) => void
+}
+
+function TimelineDependencyOverlay({
+  timelineLayout,
+  rowsContainerRef,
+  resizeState,
+  activeDragEvent,
+  onDependencyCreate,
+  eventBarRefs,
+}: TimelineDependencyOverlayProps) {
+  const [rfNodes, setRfNodes, onNodesChangeBase] = useNodesState<Node>([])
+  const [rfEdges, setRfEdges, onEdgesChange] = useEdgesState<Edge>([])
+  const isConnectingRef = useRef(false)
+
+  const lockScroll = useCallback(() => {
+    isConnectingRef.current = true
+  }, [])
+
+  const unlockScroll = useCallback(() => {
+    isConnectingRef.current = false
+  }, [])
+
+  const onNodesChange = useCallback(
+    (changes: Parameters<typeof onNodesChangeBase>[0]) => {
+      const filtered = changes.filter(
+        (c) => !('id' in c && c.id === CANVAS_NODE_ID),
+      )
+      if (filtered.length > 0) onNodesChangeBase(filtered)
+    },
+    [onNodesChangeBase],
+  )
+
+  const updatePositions = useCallback(() => {
+    const container = rowsContainerRef.current
+    if (!container) return
+
+    const containerRect = container.getBoundingClientRect()
+    const positions: Array<HandlePosition> = []
+
+    timelineLayout.rows.forEach((row: TimelineResourceRow) => {
+      row.events.forEach((e: any) => {
+        const el = eventBarRefs.current.get(e.event.id)
+        if (!el) return
+
+        const rect = el.getBoundingClientRect()
+        positions.push({
+          eventId: e.event.id,
+          x: rect.left - containerRect.left,
+          y: rect.top - containerRect.top,
+          width: rect.width,
+          height: rect.height,
+        })
+      })
+    })
+
+    setRfNodes([
+      {
+        id: CANVAS_NODE_ID,
+        type: 'depCanvas',
+        position: { x: 0, y: 0 },
+        width: containerRect.width,
+        height: containerRect.height,
+        style: { width: containerRect.width, height: containerRect.height },
+        data: { handlePositions: positions },
+        selectable: false,
+        draggable: false,
+      },
+    ])
+    const allEvents = Array.from(
+      new Map(
+        timelineLayout.rows
+          .flatMap((r: any) => r.events.map((e: any) => e.event))
+          .map((e: any) => [e.id, e]),
+      ).values(),
+    )
+    setRfEdges(buildTimelineEdges(allEvents))
+  }, [timelineLayout, rowsContainerRef, eventBarRefs, setRfNodes, setRfEdges])
+
+  useLayoutEffect(() => {
+    updatePositions()
+  }, [updatePositions, resizeState, activeDragEvent])
+
+  useEffect(() => {
+    const container = rowsContainerRef.current
+    if (!container) return
+
+    const observer = new ResizeObserver(() => updatePositions())
+    observer.observe(container)
+    return () => observer.disconnect()
+  }, [rowsContainerRef, updatePositions])
+
+  const handleConnect = useCallback(
+    (connection: Connection) => {
+      const sourceMatch = connection.sourceHandle?.match(
+        /^(.+)-source-(start|end)$/,
+      )
+      const targetMatch = connection.targetHandle?.match(
+        /^(.+)-target-(start|end)$/,
+      )
+      if (!sourceMatch || !targetMatch) return
+
+      const sourceEventId = sourceMatch[1]
+      const sourceAnchor = sourceMatch[2] as 'start' | 'end'
+      const targetEventId = targetMatch[1]
+      const targetAnchor = targetMatch[2] as 'start' | 'end'
+
+      if (sourceEventId === targetEventId) return
+      onDependencyCreate(
+        sourceEventId,
+        targetEventId,
+        sourceAnchor,
+        targetAnchor,
+      )
+    },
+    [onDependencyCreate],
+  )
+
+  return (
+    <>
+      <ReactFlow
+        className="timeline-dep-flow"
+        nodes={rfNodes}
+        edges={rfEdges}
+        onNodesChange={onNodesChange}
+        onEdgesChange={onEdgesChange}
+        onConnect={handleConnect}
+        onConnectStart={lockScroll}
+        onConnectEnd={unlockScroll}
+        nodeTypes={DEP_CANVAS_NODE_TYPES}
+        defaultViewport={{ x: 0, y: 0, zoom: 1 }}
+        panOnDrag={false}
+        zoomOnScroll={false}
+        panOnScroll={false}
+        zoomOnPinch={false}
+        zoomOnDoubleClick={false}
+        nodesDraggable={false}
+        nodesConnectable={true}
+        elementsSelectable={false}
+        preventScrolling={false}
+        autoPanOnConnect={false}
+        style={{
+          background: 'transparent',
+          overflow: 'hidden',
+          pointerEvents: 'none',
+        }}
+        proOptions={{ hideAttribution: true }}
+        autoPanOnNodeDrag={false}
+      />
+    </>
+  )
+}
+
+function timeStringToFraction(time: string): number {
+  const parts = time.split(':')
+  const totalHours = Number(parts[0]) + Number(parts[1]) / 60
+  return Math.min(totalHours, 24) / 24
+}
+
+const DraggableTimelineEvent = React.memo(function DraggableTimelineEvent({
+  event,
+  left,
+  width,
+  lane,
+  laneCount,
+  isStartClipped,
+  isEndClipped,
+  color,
+  registerEventBar,
+  onEventClick,
+  getResizeHandleProps,
+}: {
+  event: Event<Resource>
+  left: number
+  width: number
+  lane: number
+  laneCount: number
+  isStartClipped: boolean
+  isEndClipped: boolean
+  color: any
+  registerEventBar: (eventId: string) => (el: HTMLDivElement | null) => void
+  onEventClick: (event: Event<Resource>) => void
+  getResizeHandleProps: ReturnType<typeof useCalendar>['getResizeHandleProps']
+}) {
+  const laneHeightPct = 100 / laneCount
+  const topPct = lane * laneHeightPct
+
+  const {
+    ref: setDraggableRef,
+    handleRef: setDragHandleRef,
+    isDragging,
+  } = useDraggable({
+    id: `event-${event.id}`,
+    data: { event, left, width, laneHeightPct, topPct, lane, color },
+  })
+
+  const depCount = event.dependsOn?.length ?? 0
+
+  return (
+    <div
+      ref={(el) => {
+        registerEventBar(event.id)(el)
+        setDraggableRef(el)
+      }}
+      data-event-id={event.id}
+      data-left={left}
+      data-width={width}
+      className={`group absolute border ${color.bg} ${color.border} ${color.text} flex items-center text-xs font-medium overflow-hidden shadow-sm z-30 cursor-pointer hover:brightness-110 transition-[filter] pointer-events-auto ${
+        isDragging ? 'opacity-40 shadow-xl z-50' : ''
+      } ${
+        !isStartClipped && !isEndClipped
+          ? 'rounded-md'
+          : !isStartClipped
+            ? 'rounded-l-md'
+            : !isEndClipped
+              ? 'rounded-r-md'
+              : ''
+      }`}
+      style={{
+        left: `${left}%`,
+        width: `${width}%`,
+        top: `calc(${topPct}% + ${EVENT_GAP_PX}px)`,
+        height: `calc(${laneHeightPct}% - ${EVENT_GAP_PX * 2}px)`,
+      }}
+      title={`${event.title} (${toPlainDateString(event.start)}T${toPlainTimeString(event.start)} \u2192 ${toPlainDateString(event.end)}T${toPlainTimeString(event.end)})`}
+      onClick={(e) => {
+        if (
+          !(e.target as HTMLElement).closest('[data-drag-handle]') &&
+          !(e.target as HTMLElement).closest('[data-resize-handle]')
+        ) {
+          e.stopPropagation()
+          onEventClick(event)
+        }
+      }}
+    >
+      {!isStartClipped && (
+        <HorizontalResizeHandle
+          edge="left"
+          {...getResizeHandleProps(
+            event.id,
+            'left',
+            toPlainDateTimeString(event.start),
+            toPlainDateTimeString(event.end),
+          )}
+        />
+      )}
+      <div
+        ref={setDragHandleRef}
+        data-drag-handle
+        className="relative ml-3 w-4 h-full flex items-center justify-center cursor-grab active:cursor-grabbing opacity-0 group-hover:opacity-60 hover:opacity-100 transition-opacity z-40"
+        title="Drag to move"
+      >
+        <svg width="12" height="12" viewBox="0 0 12 12" fill="currentColor">
+          <circle cx="2" cy="2" r="1.5" />
+          <circle cx="6" cy="2" r="1.5" />
+          <circle cx="10" cy="2" r="1.5" />
+          <circle cx="2" cy="6" r="1.5" />
+          <circle cx="6" cy="6" r="1.5" />
+          <circle cx="10" cy="6" r="1.5" />
+          <circle cx="2" cy="10" r="1.5" />
+          <circle cx="6" cy="10" r="1.5" />
+          <circle cx="10" cy="10" r="1.5" />
+        </svg>
+      </div>
+      <div className="flex-1 h-full min-w-0 flex items-center gap-1.5 px-2.5 cursor-pointer">
+        <span className="truncate">{event.title}</span>
+        {depCount > 0 && (
+          <span
+            className="flex-shrink-0 text-[10px] leading-none rounded bg-amber-500/40 border border-amber-300/60 px-1 py-0.5 font-semibold"
+            title={`${depCount} dependenc${depCount === 1 ? 'y' : 'ies'}`}
+          >
+            ↳{depCount}
+          </span>
+        )}
+        {event.consumption && event.consumption.length > 0 && (
+          <span
+            className="flex-shrink-0 text-[10px] leading-none rounded bg-black/30 px-1 py-0.5 font-semibold"
+            title="Consumption"
+          >
+            {event.consumption.reduce((a, b) => a + b, 0)}
+          </span>
+        )}
+      </div>
+      {!isEndClipped && (
+        <HorizontalResizeHandle
+          edge="right"
+          {...getResizeHandleProps(
+            event.id,
+            'right',
+            toPlainDateTimeString(event.start),
+            toPlainDateTimeString(event.end),
+          )}
+        />
+      )}
+    </div>
+  )
+})
+
+const HorizontalTimelineRow = React.memo(function HorizontalTimelineRow({
+  row,
+  days,
+  resourceColorIndex,
+  onEventClick,
+  getResizeHandleProps,
+  getDayColumnProps,
+  getUnavailableRanges,
+  eventBarRefs,
+  rowWidthPx,
+  style,
+}: {
+  row: TimelineResourceRow<Resource, Event<Resource>>
+  days: Array<Day<Resource, Event<Resource>>>
+  resourceColorIndex: number
+  onEventClick: (event: Event<Resource>) => void
+  getResizeHandleProps: ReturnType<
+    typeof useCalendar<Resource, Event<Resource>>
+  >['getResizeHandleProps']
+  getDayColumnProps: ReturnType<
+    typeof useCalendar<Resource, Event<Resource>>
+  >['getDayColumnProps']
+  getUnavailableRanges: ReturnType<
+    typeof useCalendar<Resource, Event<Resource>>
+  >['getUnavailableRanges']
+  eventBarRefs: React.MutableRefObject<Map<string, HTMLDivElement>>
+  rowWidthPx: number
+  style?: React.CSSProperties
+}) {
+  const { ref: setDroppableRef } = useDroppable({
+    id: `resource-${row.resource.id}`,
+    data: { resource: row.resource },
+  })
+
+  const dayPercentage = 100 / days.length
+  const zoneColor =
+    RESOURCE_ZONE_COLORS[resourceColorIndex % RESOURCE_ZONE_COLORS.length] ??
+    RESOURCE_ZONE_COLORS[0]
+
+  const registerEventBar = useCallback(
+    (eventId: string) => (el: HTMLDivElement | null) => {
+      if (el) {
+        eventBarRefs.current.set(eventId, el)
+      } else {
+        eventBarRefs.current.delete(eventId)
+      }
+    },
+    [eventBarRefs],
+  )
+
+  return (
+    <div
+      ref={setDroppableRef}
+      className="relative border-b border-neutral-800/50"
+      style={{ minHeight: '56px', width: rowWidthPx, ...style }}
+    >
+      {days.map((day, i) => {
+        const unavailableRanges = getUnavailableRanges(day.isoDate, {
+          resourceIds: [row.resource.id],
+        })
+
+        return (
+          <div
+            key={day.isoDate}
+            className={`absolute top-0 bottom-0 border-r border-neutral-800/30 ${
+              day.isToday ? 'bg-neutral-800/20' : ''
+            }`}
+            style={{
+              left: `${i * dayPercentage}%`,
+              width: `${dayPercentage}%`,
+            }}
+            {...getDayColumnProps(day.isoDate)}
+          >
+            {Array.from({ length: 23 }, (_, h) => (
+              <div
+                key={h}
+                className="absolute top-0 bottom-0 border-r border-neutral-800/10"
+                style={{ left: `${((h + 1) / 24) * 100}%` }}
+              />
+            ))}
+            {unavailableRanges.map((range, rangeIdx) => {
+              const startFraction = timeStringToFraction(range.startTime)
+              const endFraction = timeStringToFraction(range.endTime)
+              return (
+                <div
+                  key={rangeIdx}
+                  className="absolute top-0 bottom-0 pointer-events-none z-0 bg-[length:8px_8px]"
+                  style={{
+                    left: `${startFraction * 100}%`,
+                    width: `${(endFraction - startFraction) * 100}%`,
+                    backgroundImage: `repeating-linear-gradient(315deg, ${zoneColor} 0, ${zoneColor} 1px, transparent 0, transparent 50%)`,
+                  }}
+                  title={`Unavailable — ${row.resource.label}: ${range.startTime}–${range.endTime}`}
+                />
+              )
+            })}
+          </div>
+        )
+      })}
+      {row.events.map(
+        ({ event, left, width, lane, isStartClipped, isEndClipped }) => {
+          const color = getEventColor(event.id)
+
+          return (
+            <DraggableTimelineEvent
+              key={event.id}
+              event={event}
+              left={left}
+              width={width}
+              lane={lane}
+              laneCount={row.laneCount}
+              isStartClipped={isStartClipped}
+              isEndClipped={isEndClipped}
+              color={color}
+              registerEventBar={registerEventBar}
+              onEventClick={onEventClick}
+              getResizeHandleProps={getResizeHandleProps}
+            />
+          )
+        },
+      )}
+    </div>
+  )
+})
+
+function TimelineDemo() {
+  const [modalState, setModalState] = useState<{
+    isOpen: boolean
+    mode: 'add' | 'edit'
+    eventId?: string
+    initialData: EventFormData
+  }>({ isOpen: false, mode: 'add', initialData: emptyFormData })
+
+  const [resizeError, setResizeError] = useState<ResizeError | null>(null)
+
+  const [pendingDep, setPendingDep] = useState<{
+    sourceId: string
+    targetId: string
+    sourceAnchor: 'start' | 'end'
+    targetAnchor: 'start' | 'end'
+    sourceTitle: string
+    targetTitle: string
+    suggestedType: DependencyType
+  } | null>(null)
+
+  const scrollContainerRef = useRef<HTMLDivElement>(null)
+  const timelineContentRef = useRef<HTMLDivElement>(null)
+  const containerWidthRef = useRef(0)
+  const MIN_DAY_WIDTH_PX = 1600
+  const ROW_HEIGHT_PX = 56
+  const [viewportWidth, setViewportWidth] = useState(0)
+
+  useEffect(() => {
+    const measure = () => {
+      const el = scrollContainerRef.current
+      if (el) setViewportWidth(el.clientWidth)
+    }
+    measure()
+    const observer = new ResizeObserver(measure)
+    if (scrollContainerRef.current) observer.observe(scrollContainerRef.current)
+    return () => observer.disconnect()
+  }, [])
+
+  const calendar = useCalendar<Resource, Event<Resource>>({
+    viewMode: { value: 1, unit: 'week' },
+    events: [],
+    resources: sampleResources,
+    timeZone: 'UTC',
+    fetchEvents: async ({ start, end }) => {
+      // Simulate network latency
+      await new Promise((resolve) => setTimeout(resolve, 800))
+
+      const startDate = new Date(start)
+      const endDate = new Date(end)
+
+      return MOCK_DB.filter((e) => {
+        const eStart = new Date(e.start as string)
+        const eEnd = new Date(e.end as string)
+        return eStart <= endDate && eEnd >= startDate
+      })
+    },
+    resize: {
+      enabled: true,
+      get containerWidth() {
+        return containerWidthRef.current
+      },
+      orientation: 'horizontal',
+      constraints: {
+        minDurationMinutes: 15,
+        snapToMinutes: 15,
+      },
+      onResizeError: (error) => {
+        setResizeError(error)
+      },
+    },
+  })
+
+  const horizNavCooldownRef = useRef(false)
+
+  useEffect(() => {
+    const container = scrollContainerRef.current
+    if (!container) return
+
+    const onScroll = () => {
+      if (horizNavCooldownRef.current) return
+      const { scrollLeft, scrollWidth, clientWidth } = container
+
+      if (
+        scrollLeft + clientWidth >= scrollWidth - 8 &&
+        calendar.canGoNextPeriod()
+      ) {
+        horizNavCooldownRef.current = true
+        calendar.goToNextPeriod()
+        requestAnimationFrame(() => {
+          container.scrollLeft = 0
+          setTimeout(() => {
+            horizNavCooldownRef.current = false
+          }, 1000)
+        })
+      } else if (
+        scrollLeft <= 8 &&
+        scrollWidth > clientWidth &&
+        calendar.canGoPreviousPeriod()
+      ) {
+        horizNavCooldownRef.current = true
+        calendar.goToPreviousPeriod()
+        requestAnimationFrame(() => {
+          container.scrollLeft = container.scrollWidth - container.clientWidth
+          setTimeout(() => {
+            horizNavCooldownRef.current = false
+          }, 1000)
+        })
+      }
+    }
+
+    container.addEventListener('scroll', onScroll, { passive: true })
+    return () => container.removeEventListener('scroll', onScroll)
+  }, [calendar])
+
+  const timelineLayout = useMemo(
+    () => calendar.getTimelineLayout(),
+    [calendar.days],
+  )
+
+  const dayWidthPx = Math.max(
+    MIN_DAY_WIDTH_PX,
+    viewportWidth > 0 && calendar.days.length > 0
+      ? viewportWidth / calendar.days.length
+      : MIN_DAY_WIDTH_PX,
+  )
+  const totalContentWidthPx = calendar.days.length * dayWidthPx
+
+  const columnVirtualizer = useVirtualizer({
+    horizontal: true,
+    count: calendar.days.length,
+    getScrollElement: () => scrollContainerRef.current,
+    estimateSize: () => dayWidthPx,
+    overscan: 2,
+  })
+
+  useLayoutEffect(() => {
+    columnVirtualizer.measure()
+  }, [dayWidthPx, columnVirtualizer])
+
+  const rowVirtualizer = useVirtualizer({
+    count: timelineLayout.rows.length,
+    getScrollElement: () => scrollContainerRef.current,
+    estimateSize: () => ROW_HEIGHT_PX,
+    overscan: 3,
+  })
+
+  useEffect(() => {
+    containerWidthRef.current = totalContentWidthPx
+  }, [totalContentWidthPx])
+
+  const eventBarRefsMap = useRef<Map<string, HTMLDivElement>>(new Map())
+  const rowsContainerRef = useRef<HTMLDivElement>(null)
+
+  const firstDayIso = useMemo(
+    () => calendar.days[0]?.isoDate ?? '',
+    [calendar.days],
+  )
+
+  const totalDays = calendar.days.length
+  const { resizeState } = calendar
+  const prevResizedIdRef = useRef<string | null>(null)
+
+  useLayoutEffect(() => {
+    const prevId = prevResizedIdRef.current
+
+    if (prevId && (!resizeState.isResizing || resizeState.eventId !== prevId)) {
+      const prevEl = eventBarRefsMap.current.get(prevId)
+      if (prevEl) {
+        prevEl.classList.remove(
+          'ring-2',
+          'ring-neutral-500',
+          'z-20',
+          'brightness-110',
+        )
+      }
+      prevResizedIdRef.current = null
+    }
+
+    if (
+      !resizeState.isResizing ||
+      !resizeState.eventId ||
+      !resizeState.previewStart ||
+      !resizeState.previewEnd ||
+      !firstDayIso
+    ) {
+      return
+    }
+
+    const el = eventBarRefsMap.current.get(resizeState.eventId)
+    if (!el) return
+
+    const preview = calculateTimelineResizePreview({
+      previewStart: resizeState.previewStart,
+      previewEnd: resizeState.previewEnd,
+      firstDayIso,
+      totalDays,
+    })
+
+    el.style.left = preview.left
+    el.style.width = preview.width
+    el.classList.add('ring-2', 'ring-neutral-500', 'z-20', 'brightness-110')
+    prevResizedIdRef.current = resizeState.eventId
+  }, [resizeState, firstDayIso, totalDays])
+
+  const inferDepType = useCallback(
+    (
+      sourceAnchor: 'start' | 'end',
+      targetAnchor: 'start' | 'end',
+    ): DependencyType => {
+      if (sourceAnchor === 'end' && targetAnchor === 'start') return 'FS'
+      if (sourceAnchor === 'start' && targetAnchor === 'start') return 'SS'
+      if (sourceAnchor === 'end' && targetAnchor === 'end') return 'FF'
+      return 'SF'
+    },
+    [],
+  )
+
+  const handleDependencyDragged = useCallback(
+    (
+      sourceId: string,
+      targetId: string,
+      sourceAnchor: 'start' | 'end',
+      targetAnchor: 'start' | 'end',
+    ) => {
+      const sourceEvent = calendar.getEvents().find((e) => e.id === sourceId)
+      const targetEvent = calendar.getEvents().find((e) => e.id === targetId)
+      if (!sourceEvent || !targetEvent) return
+
+      setPendingDep({
+        sourceId,
+        targetId,
+        sourceAnchor,
+        targetAnchor,
+        sourceTitle: sourceEvent.title,
+        targetTitle: targetEvent.title,
+        suggestedType: inferDepType(sourceAnchor, targetAnchor),
+      })
+    },
+    [calendar, inferDepType],
+  )
+
+  const finalizeDependency = useCallback(
+    (type: DependencyType) => {
+      if (!pendingDep) return
+      const result = calendar.createDependency(
+        pendingDep.sourceId,
+        pendingDep.targetId,
+        type,
+      )
+      if (result.blocked && result.error) {
+        setResizeError(result.error)
+      }
+      setPendingDep(null)
+    },
+    [calendar, pendingDep],
+  )
+
+  const openAddModal = () =>
+    setModalState({ isOpen: true, mode: 'add', initialData: emptyFormData })
+
+  const openEditModal = useCallback((event: Event<Resource>) => {
+    setModalState({
+      isOpen: true,
+      mode: 'edit',
+      eventId: event.id,
+      initialData: {
+        title: event.title,
+        startDate: toPlainDateString(event.start),
+        startTime: toPlainTimeString(event.start),
+        endDate: toPlainDateString(event.end),
+        endTime: toPlainTimeString(event.end),
+        resourceId: event.resources?.[0]?.id ?? resourceDesign.id,
+        consumption: event.consumption?.[0] ?? 1,
+        dependsOn: event.dependsOn ?? [],
+      },
+    })
+  }, [])
+
+  const [isSaving, setIsSaving] = useState(false)
+
+  const handleSave = async (data: EventFormData) => {
+    setIsSaving(true)
+    try {
+      const start = `${data.startDate}T${data.startTime}:00`
+      const end = `${data.endDate}T${data.endTime}:00`
+
+      const resource = sampleResources.find((r) => r.id === data.resourceId)
+      const resources = resource ? [resource] : []
+
+      const result =
+        modalState.mode === 'edit' && modalState.eventId
+          ? await calendar.editEvent(
+              modalState.eventId,
+              {
+                title: data.title,
+                start,
+                end,
+                resources,
+                consumption: [data.consumption],
+                dependsOn: data.dependsOn,
+              },
+              { dependsOn: data.dependsOn },
+            )
+          : await calendar.addEvent(
+              {
+                id: String(Date.now()),
+                title: data.title,
+                start,
+                end,
+                resources,
+                consumption: [data.consumption],
+                dependsOn: data.dependsOn,
+              },
+              { dependsOn: data.dependsOn },
+            )
+
+      if (!result.success) {
+        setResizeError(result.error)
+        throw new Error('Validation failed')
+      }
+    } finally {
+      setIsSaving(false)
+    }
+  }
+
+  const handleDelete = () => {
+    if (modalState.eventId) calendar.removeEvent(modalState.eventId)
+  }
+
+  const [activeDragEvent, setActiveDragEvent] = useState<any>(null)
+
+  const handleDragStart = (e: any) => {
+    setActiveDragEvent(e.operation?.source?.data)
+  }
+
+  const handleDragEnd = async (e: any) => {
+    setActiveDragEvent(null)
+    const sourceData = e.operation?.source?.data
+    const targetData = e.operation?.target?.data
+
+    if (!sourceData || !sourceData.event) return
+
+    const draggedEvent = sourceData.event
+    const newResource = targetData?.resource || draggedEvent.resources?.[0]
+
+    const deltaX =
+      e.operation?.transform?.x ??
+      e.operation?.position?.delta?.x ??
+      e.delta?.x ??
+      0
+
+    if (deltaX !== 0 || targetData?.resource) {
+      const containerW = containerWidthRef.current || 1
+      const totalDays = calendar.days.length
+      const totalHours = totalDays * 24
+      const hoursShift = (deltaX / containerW) * totalHours
+
+      const snapShift = Math.round(hoursShift / 0.25) * 0.25
+      const msShift = snapShift * 3600 * 1000
+
+      const resourceChanged =
+        targetData?.resource &&
+        targetData.resource.id !== draggedEvent.resources?.[0]?.id
+
+      if (snapShift === 0 && !resourceChanged) return
+
+      const newStart = new Date(
+        new Date(draggedEvent.start).getTime() + msShift,
+      )
+      const newEnd = new Date(new Date(draggedEvent.end).getTime() + msShift)
+
+      const nextStart = `${toPlainDateString(newStart)}T${toPlainTimeString(newStart)}:00`
+      const nextEnd = `${toPlainDateString(newEnd)}T${toPlainTimeString(newEnd)}:00`
+
+      const validation = calendar.validateMove(
+        draggedEvent.id,
+        nextStart,
+        nextEnd,
+        newResource ? [newResource] : [],
+      )
+
+      if (validation.blocked) {
+        getTimeClient().emit('event:update:error', {
+          eventId: draggedEvent.id,
+          eventTitle: draggedEvent.title,
+          reason: 'unavailable-time',
+          message:
+            validation.message ?? 'This move is blocked by availability.',
+          originalStart: draggedEvent.start,
+          originalEnd: draggedEvent.end,
+          attemptedStart: nextStart,
+          attemptedEnd: nextEnd,
+        })
+
+        setResizeError({
+          eventId: draggedEvent.id,
+          eventTitle: draggedEvent.title,
+          reason: 'unavailable-time',
+          message:
+            validation.message ?? 'This move is blocked by availability.',
+          originalStart: draggedEvent.start,
+          originalEnd: draggedEvent.end,
+        })
+        return
+      }
+
+      await calendar.editEvent(draggedEvent.id, {
+        start: nextStart,
+        end: nextEnd,
+        resources: newResource ? [newResource] : [],
+      })
+    }
+  }
+
+  const viewModeOptions = [
+    { label: 'Week', value: 1, unit: 'week' as const },
+    { label: '2 Weeks', value: 2, unit: 'week' as const },
+  ]
+
+  const virtualColumns = columnVirtualizer.getVirtualItems()
+  const virtualRows = rowVirtualizer.getVirtualItems()
+  const rowsTotalHeight = rowVirtualizer.getTotalSize()
+
+  const allEvents = calendar.getEvents()
+
+  return (
+    <DragDropProvider onDragStart={handleDragStart} onDragEnd={handleDragEnd}>
+      <div className="p-5 max-w-[1400px] mx-auto min-h-screen">
+        <div className="mb-6">
+          <h1 className="m-0 mb-4 text-[28px] font-semibold text-white">
+            TanStack Time — Timeline
+          </h1>
+
+          <div className="flex gap-3 items-center mb-4 flex-wrap">
+            <Button
+              variant="outline"
+              onClick={calendar.goToPreviousPeriod}
+              disabled={!calendar.canGoPreviousPeriod() || calendar.isPending}
+            >
+              ← Previous
+            </Button>
+            <Button
+              variant="outline"
+              onClick={calendar.goToCurrentPeriod}
+              disabled={calendar.isPending}
+            >
+              Today
+            </Button>
+            <Button
+              variant="outline"
+              onClick={calendar.goToNextPeriod}
+              disabled={!calendar.canGoNextPeriod() || calendar.isPending}
+            >
+              Next →
+            </Button>
+            <Button onClick={openAddModal}>+ Add Event</Button>
+
+            <Button
+              onClick={calendar.undo}
+              disabled={!calendar.canUndo()}
+              variant="outline"
+              title="Undo"
+            >
+              ↩ Undo
+            </Button>
+            <Button
+              onClick={calendar.redo}
+              disabled={!calendar.canRedo()}
+              variant="outline"
+              title="Redo"
+            >
+              ↪ Redo
+            </Button>
+
+            <div className="ml-auto flex gap-2">
+              {viewModeOptions.map((opt) => {
+                const isActive =
+                  calendar.viewMode.value === opt.value &&
+                  calendar.viewMode.unit === opt.unit
+                return (
+                  <Button
+                    key={opt.label}
+                    variant={isActive ? 'default' : 'outline'}
+                    size="sm"
+                    onClick={() =>
+                      calendar.changeViewMode({
+                        value: opt.value,
+                        unit: opt.unit,
+                      })
+                    }
+                  >
+                    {opt.label}
+                  </Button>
+                )
+              })}
+            </div>
+          </div>
+
+          <div className="text-lg font-medium text-neutral-400">
+            {calendar.formatPeriodLabel()}
+          </div>
+        </div>
+
+        <div className="border border-neutral-800 rounded-lg overflow-hidden bg-black">
+          <div className="flex">
+            <div className="w-36 flex-shrink-0 border-r border-neutral-800 bg-neutral-950 z-10">
+              <div className="h-10 border-b border-neutral-800/50" />
+              <div className="h-8 border-b border-neutral-800 px-3 flex items-end pb-1">
+                <span className="text-xs font-semibold text-neutral-500 uppercase tracking-wider">
+                  Resources
+                </span>
+              </div>
+              {sampleResources.map((resource, idx) => {
+                const zoneColor =
+                  RESOURCE_ZONE_COLORS[idx % RESOURCE_ZONE_COLORS.length] ??
+                  RESOURCE_ZONE_COLORS[0]
+                return (
+                  <div
+                    key={resource.id}
+                    className="h-14 border-b border-neutral-800/50 px-3 flex items-center gap-2"
+                  >
+                    <div
+                      className="w-3 h-3 flex-shrink-0 rounded-sm bg-[length:6px_6px]"
+                      style={{
+                        backgroundImage: `repeating-linear-gradient(315deg, ${zoneColor} 0, ${zoneColor} 1px, transparent 0, transparent 50%)`,
+                        backgroundColor: zoneColor,
+                      }}
+                    />
+                    <span className="text-sm font-medium text-neutral-300 truncate">
+                      {resource.label}
+                    </span>
+                    {resource.capacity && resource.capacity.length > 0 && (
+                      <span
+                        className="ml-auto text-[10px] uppercase tracking-wide text-neutral-500 border border-neutral-700 rounded px-1.5 py-0.5"
+                        title="Total capacity"
+                      >
+                        cap {resource.capacity.reduce((a, b) => a + b, 0)}
+                      </span>
+                    )}
+                  </div>
+                )
+              })}
+            </div>
+
+            <ScrollArea
+              viewportRef={scrollContainerRef}
+              viewportClassName="max-h-[600px] [&>div]:!block"
+              className="flex-1 min-w-0"
+            >
+              <div
+                ref={timelineContentRef}
+                style={{
+                  width: totalContentWidthPx,
+                  position: 'relative',
+                }}
+              >
+                <div
+                  className="sticky top-0 z-30 bg-neutral-950"
+                  style={{ width: totalContentWidthPx }}
+                >
+                  <div
+                    className="h-10 border-b border-neutral-800/50 relative"
+                    style={{ width: totalContentWidthPx }}
+                  >
+                    {virtualColumns.map((vc) => {
+                      const day = calendar.days[vc.index]
+                      const localDate = new Date(
+                        day.date.year,
+                        day.date.month - 1,
+                        day.date.day,
+                      )
+                      const dayName = localDate.toLocaleDateString(undefined, {
+                        weekday: 'short',
+                      })
+                      const dayNum = day.date.day
+                      const monthName = localDate.toLocaleDateString(
+                        undefined,
+                        { month: 'short' },
+                      )
+                      return (
+                        <div
+                          key={day.isoDate}
+                          className={`absolute top-0 bottom-0 border-r border-neutral-800/50 flex items-center justify-center gap-1.5 ${
+                            day.isToday ? 'bg-neutral-800/30' : ''
+                          }`}
+                          style={{
+                            left: vc.start,
+                            width: vc.size,
+                          }}
+                        >
+                          <span className="text-[10px] text-neutral-500 uppercase">
+                            {dayName}
+                          </span>
+                          <span
+                            className={`text-sm font-semibold ${
+                              day.isToday ? 'text-white' : 'text-neutral-300'
+                            }`}
+                          >
+                            {dayNum}
+                          </span>
+                          <span className="text-[10px] text-neutral-600">
+                            {monthName}
+                          </span>
+                        </div>
+                      )
+                    })}
+                  </div>
+                  <div
+                    className="h-8 border-b border-neutral-800 relative"
+                    style={{ width: totalContentWidthPx }}
+                  >
+                    {virtualColumns.map((vc) => {
+                      const day = calendar.days[vc.index]
+                      return (
+                        <div
+                          key={day.isoDate + '-hours'}
+                          className="absolute top-0 bottom-0 border-r border-neutral-800/50"
+                          style={{ left: vc.start, width: vc.size }}
+                        >
+                          {Array.from({ length: 24 }, (_, h) => (
+                            <div
+                              key={h}
+                              className="absolute top-0 bottom-0 border-r border-neutral-800/20 flex items-end justify-center pb-1"
+                              style={{
+                                left: `${(h / 24) * 100}%`,
+                                width: `${(1 / 24) * 100}%`,
+                              }}
+                            >
+                              <span className="text-[9px] text-neutral-600">
+                                {h.toString().padStart(2, '0')}
+                              </span>
+                            </div>
+                          ))}
+                        </div>
+                      )
+                    })}
+                  </div>
+                </div>
+
+                <div
+                  ref={rowsContainerRef}
+                  className="relative"
+                  style={{
+                    height: rowsTotalHeight,
+                    width: totalContentWidthPx,
+                  }}
+                >
+                  {timelineLayout.currentTimePosition !== null && (
+                    <div
+                      className="absolute top-0 bottom-0 w-px bg-red-500 z-20 pointer-events-none"
+                      style={{
+                        left: `${timelineLayout.currentTimePosition}%`,
+                      }}
+                    >
+                      <div className="absolute -top-1 left-1/2 -translate-x-1/2 w-2.5 h-2.5 bg-red-500 rounded-full" />
+                    </div>
+                  )}
+                  {virtualRows.map((vr) => {
+                    const row = timelineLayout.rows[vr.index]
+                    return (
+                      <HorizontalTimelineRow
+                        key={row.resource.id}
+                        row={row}
+                        days={calendar.days}
+                        resourceColorIndex={vr.index}
+                        onEventClick={openEditModal}
+                        getResizeHandleProps={calendar.getResizeHandleProps}
+                        getDayColumnProps={calendar.getDayColumnProps}
+                        getUnavailableRanges={calendar.getUnavailableRanges}
+                        eventBarRefs={eventBarRefsMap}
+                        rowWidthPx={totalContentWidthPx}
+                        style={{
+                          position: 'absolute',
+                          top: 0,
+                          left: 0,
+                          height: vr.size,
+                          transform: `translateY(${vr.start}px)`,
+                        }}
+                      />
+                    )
+                  })}
+                  <div
+                    className="absolute inset-0 z-20 pointer-events-none"
+                    style={{ overflow: 'hidden' }}
+                  >
+                    <TimelineDependencyOverlay
+                      timelineLayout={timelineLayout}
+                      eventBarRefs={eventBarRefsMap}
+                      rowsContainerRef={rowsContainerRef}
+                      resizeState={resizeState}
+                      activeDragEvent={activeDragEvent}
+                      onDependencyCreate={handleDependencyDragged}
+                    />
+                  </div>
+                </div>
+              </div>
+            </ScrollArea>
+          </div>
+        </div>
+
+        <div className="mt-4 flex flex-wrap gap-x-6 gap-y-3">
+          <div className="flex flex-wrap items-center gap-3 border-l border-border pl-6">
+            <span className="text-xs uppercase tracking-wider text-neutral-500 font-semibold">
+              Dependencies:
+            </span>
+            {ALL_DEP_TYPES.map((type) => {
+              const style = DEP_TYPE_STYLES[type]
+              return (
+                <div
+                  key={type}
+                  className="flex items-center gap-2"
+                  title={style.description}
+                >
+                  <svg width="28" height="10" className="flex-shrink-0">
+                    <line
+                      x1="0"
+                      y1="5"
+                      x2="28"
+                      y2="5"
+                      stroke={style.color}
+                      strokeWidth="2"
+                      strokeDasharray={style.strokeDasharray}
+                    />
+                  </svg>
+                  <span
+                    className={`${style.badgeBg} text-white text-[10px] font-bold rounded px-1.5 py-0.5`}
+                  >
+                    {style.label}
+                  </span>
+                  <span className="text-xs text-neutral-400">
+                    {style.description.split(' (')[0]}
+                  </span>
+                </div>
+              )
+            })}
+          </div>
+        </div>
+
+        <div className="mt-4 flex flex-wrap gap-x-6 gap-y-3">
+          <div className="flex flex-wrap gap-2">
+            {allEvents.map((event) => {
+              const color = getEventColor(event.id)
+              return (
+                <Badge
+                  key={event.id}
+                  variant="outline"
+                  className="gap-1.5 font-normal"
+                >
+                  <div
+                    className={`w-2.5 h-2.5 rounded-sm ${color.bg} ${color.border} border`}
+                  />
+                  <span className="text-muted-foreground">{event.title}</span>
+                </Badge>
+              )
+            })}
+          </div>
+
+          <div className="flex flex-wrap gap-2 border-l border-border pl-6">
+            {sampleResources.map((resource, idx) => {
+              const zoneColor =
+                RESOURCE_ZONE_COLORS[idx % RESOURCE_ZONE_COLORS.length] ??
+                RESOURCE_ZONE_COLORS[0]
+              return (
+                <Badge
+                  key={resource.id}
+                  variant="secondary"
+                  className="gap-1.5 font-normal"
+                >
+                  <div
+                    className="w-2.5 h-2.5 rounded-sm bg-[length:6px_6px]"
+                    style={{
+                      backgroundImage: `repeating-linear-gradient(315deg, ${zoneColor} 0, ${zoneColor} 1px, transparent 0, transparent 50%)`,
+                      backgroundColor: zoneColor,
+                    }}
+                  />
+                  <span className="text-muted-foreground">
+                    {resource.label} — unavailable
+                  </span>
+                </Badge>
+              )
+            })}
+          </div>
+        </div>
+
+        {calendar.isPending && (
+          <div className="fixed top-5 right-5">
+            <Badge
+              variant="secondary"
+              className="px-5 py-3 text-sm font-medium"
+            >
+              Loading...
+            </Badge>
+          </div>
+        )}
+
+        <EventModal
+          isOpen={modalState.isOpen}
+          onClose={() => setModalState((prev) => ({ ...prev, isOpen: false }))}
+          onSave={handleSave}
+          onDelete={modalState.mode === 'edit' ? handleDelete : undefined}
+          initialData={modalState.initialData}
+          mode={modalState.mode}
+          isSaving={isSaving}
+          allEvents={allEvents}
+          editingEventId={modalState.eventId}
+        />
+
+        <DependencyTypeModal
+          isOpen={pendingDep !== null}
+          sourceTitle={pendingDep?.sourceTitle ?? ''}
+          targetTitle={pendingDep?.targetTitle ?? ''}
+          onChoose={finalizeDependency}
+          onCancel={() => setPendingDep(null)}
+        />
+
+        {resizeError && (
+          <ResizeErrorToast
+            error={resizeError}
+            onDismiss={() => setResizeError(null)}
+          />
+        )}
+
+        {activeDragEvent && (
+          <DragOverlay dropAnimation={null}>
+            <div
+              className={`group absolute border ${activeDragEvent.color.bg} ${activeDragEvent.color.border} ${activeDragEvent.color.text} px-2.5 flex items-center text-xs font-medium overflow-hidden shadow-sm z-[9999] rounded-md`}
+              style={{
+                width: `${containerWidthRef.current * (activeDragEvent.width / 100)}px`,
+                height: `${(activeDragEvent.laneHeightPct / 100) * 56 - EVENT_GAP_PX * 2}px`,
+              }}
+            >
+              <span className="truncate">{activeDragEvent.event.title}</span>
+            </div>
+          </DragOverlay>
+        )}
+      </div>
+    </DragDropProvider>
+  )
+}
+
+function App() {
+  const queryClient = new QueryClient()
+
+  return (
+    <QueryClientProvider client={queryClient}>
+      <TanStackDevtools
+        plugins={[
+          timeDevtoolsPlugin(),
+          {
+            name: 'TanStack Query',
+            render: <ReactQueryDevtoolsPanel />,
+          },
+        ]}
+      />
+      <TimelineDemo />
+    </QueryClientProvider>
+  )
+}
+
+ReactDOM.createRoot(document.getElementById('root')!).render(<App />)
diff --git a/examples/react/timeline/tailwind.config.js b/examples/react/timeline/tailwind.config.js
new file mode 100644
index 00000000..aca8dbbc
--- /dev/null
+++ b/examples/react/timeline/tailwind.config.js
@@ -0,0 +1,50 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  darkMode: ['class'],
+  content: ['./index.html', './src/**/*.{js,ts,jsx,tsx}'],
+  theme: {
+    extend: {
+      colors: {
+        border: 'hsl(var(--border))',
+        input: 'hsl(var(--input))',
+        ring: 'hsl(var(--ring))',
+        background: 'hsl(var(--background))',
+        foreground: 'hsl(var(--foreground))',
+        primary: {
+          DEFAULT: 'hsl(var(--primary))',
+          foreground: 'hsl(var(--primary-foreground))',
+        },
+        secondary: {
+          DEFAULT: 'hsl(var(--secondary))',
+          foreground: 'hsl(var(--secondary-foreground))',
+        },
+        destructive: {
+          DEFAULT: 'hsl(var(--destructive))',
+          foreground: 'hsl(var(--destructive-foreground))',
+        },
+        muted: {
+          DEFAULT: 'hsl(var(--muted))',
+          foreground: 'hsl(var(--muted-foreground))',
+        },
+        accent: {
+          DEFAULT: 'hsl(var(--accent))',
+          foreground: 'hsl(var(--accent-foreground))',
+        },
+        popover: {
+          DEFAULT: 'hsl(var(--popover))',
+          foreground: 'hsl(var(--popover-foreground))',
+        },
+        card: {
+          DEFAULT: 'hsl(var(--card))',
+          foreground: 'hsl(var(--card-foreground))',
+        },
+      },
+      borderRadius: {
+        lg: 'var(--radius)',
+        md: 'calc(var(--radius) - 2px)',
+        sm: 'calc(var(--radius) - 4px)',
+      },
+    },
+  },
+  plugins: [require('tailwindcss-animate')],
+}
diff --git a/examples/react/timeline/tsconfig.json b/examples/react/timeline/tsconfig.json
new file mode 100644
index 00000000..e3648801
--- /dev/null
+++ b/examples/react/timeline/tsconfig.json
@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["./src/*"]
+    },
+    "target": "ESNext",
+    "lib": ["DOM", "DOM.Iterable", "ESNext"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    "moduleResolution": "Bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src", "vite.config.ts"]
+}
diff --git a/examples/react/timeline/vite.config.ts b/examples/react/timeline/vite.config.ts
new file mode 100644
index 00000000..0d51f19e
--- /dev/null
+++ b/examples/react/timeline/vite.config.ts
@@ -0,0 +1,12 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import path from 'path'
+
+export default defineConfig({
+  plugins: [react()],
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
+})
diff --git a/knip.json b/knip.json
new file mode 100644
index 00000000..58066a25
--- /dev/null
+++ b/knip.json
@@ -0,0 +1,16 @@
+{
+  "$schema": "https://unpkg.com/knip@5/schema.json",
+  "ignoreDependencies": [
+    "@faker-js/faker",
+    "@tanstack/store",
+    "@tanstack/time",
+    "@tanstack/time-devtools",
+    "@tanstack/react-store",
+    "@tanstack/solid-store",
+    "@testing-library/jest-dom",
+    "@testing-library/react",
+    "@types/react",
+    "react"
+  ],
+  "ignoreWorkspaces": ["examples/**"]
+}
diff --git a/nx.json b/nx.json
new file mode 100644
index 00000000..7b9c66d4
--- /dev/null
+++ b/nx.json
@@ -0,0 +1,63 @@
+{
+  "$schema": "./node_modules/nx/schemas/nx-schema.json",
+  "defaultBase": "main",
+  "nxCloudId": "6932bc70f7d82526902f62fa",
+  "useInferencePlugins": false,
+  "parallel": 5,
+  "tui": {
+    "enabled": false
+  },
+  "namedInputs": {
+    "sharedGlobals": [
+      "{workspaceRoot}/.nvmrc",
+      "{workspaceRoot}/package.json",
+      "{workspaceRoot}/tsconfig.json"
+    ],
+    "default": [
+      "sharedGlobals",
+      "{projectRoot}/**/*",
+      "!{projectRoot}/**/*.md"
+    ],
+    "production": [
+      "default",
+      "!{projectRoot}/tests/**/*",
+      "!{projectRoot}/eslint.config.js"
+    ]
+  },
+  "targetDefaults": {
+    "test:lib": {
+      "cache": true,
+      "dependsOn": ["^build"],
+      "inputs": ["default", "^production"],
+      "outputs": ["{projectRoot}/coverage"]
+    },
+    "test:eslint": {
+      "cache": true,
+      "dependsOn": ["^build"],
+      "inputs": ["default", "^production", "{workspaceRoot}/eslint.config.js"]
+    },
+    "test:types": {
+      "cache": true,
+      "dependsOn": ["^build"],
+      "inputs": ["default", "^production"]
+    },
+    "build": {
+      "cache": true,
+      "dependsOn": ["^build"],
+      "inputs": ["production", "^production"],
+      "outputs": ["{projectRoot}/build", "{projectRoot}/dist"]
+    },
+    "test:docs": {
+      "cache": true,
+      "inputs": ["{workspaceRoot}/docs/**/*"]
+    },
+    "test:knip": {
+      "cache": true,
+      "inputs": ["{workspaceRoot}/**/*"]
+    },
+    "test:sherif": {
+      "cache": true,
+      "inputs": ["{workspaceRoot}/**/package.json"]
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 00000000..1941f69a
--- /dev/null
+++ b/package.json
@@ -0,0 +1,77 @@
+{
+  "name": "root",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/TanStack/time.git"
+  },
+  "packageManager": "pnpm@11.9.0",
+  "engines": {
+    "pnpm": ">=11.9.0"
+  },
+  "type": "module",
+  "scripts": {
+    "build": "nx affected --skip-nx-cache --targets=build --exclude=examples/**",
+    "build:all": "nx run-many --targets=build --exclude=examples/**",
+    "build:core": "nx run-many --targets=build --projects=packages/time",
+    "changeset": "changeset",
+    "changeset:publish": "changeset publish",
+    "changeset:version": "changeset version && pnpm install --no-frozen-lockfile && pnpm format",
+    "clean": "find . -name 'dist' -type d -prune -exec rm -rf {} +",
+    "clean:node_modules": "find . -name 'node_modules' -type d -prune -exec rm -rf {} +",
+    "clean:all": "pnpm run clean && pnpm run clean:node_modules",
+    "copy:readme": "cp README.md packages/time/README.md && cp README.md packages/time-devtools/README.md && cp README.md packages/react-time/README.md && cp README.md packages/react-time-devtools/README.md && cp README.md packages/solid-time/README.md && cp README.md packages/solid-time-devtools/README.md",
+    "dev": "pnpm run watch",
+    "format": "prettier --experimental-cli --ignore-unknown '**/*' --write",
+    "generate-docs": "node scripts/generate-docs.ts && pnpm run copy:readme",
+    "graphify": "node scripts/graphify.ts",
+    "lint:fix": "nx affected --target=lint:fix --exclude=examples/**",
+    "lint:fix:all": "nx run-many --targets=lint --fix",
+    "test": "pnpm run test:ci",
+    "test:ci": "nx run-many --targets=test:eslint,test:sherif,test:knip,test:docs,test:lib,test:types,build",
+    "test:docs": "node scripts/verify-links.ts",
+    "test:eslint": "nx affected --target=test:eslint --exclude=examples/**",
+    "test:knip": "knip",
+    "test:lib": "nx affected --targets=test:lib --exclude=examples/**",
+    "test:lib:dev": "pnpm test:lib && nx watch --all -- pnpm test:lib",
+    "test:pr": "nx affected --targets=test:eslint,test:sherif,test:knip,test:docs,test:lib,test:types,build",
+    "test:sherif": "sherif",
+    "test:types": "nx affected --targets=test:types --exclude=examples/**",
+    "watch": "pnpm run build:all && nx watch --all -- pnpm run build:all"
+  },
+  "nx": {
+    "includedScripts": [
+      "test:docs",
+      "test:knip",
+      "test:sherif"
+    ]
+  },
+  "devDependencies": {
+    "@changesets/changelog-github": "^0.7.0",
+    "@changesets/cli": "^2.29.8",
+    "@faker-js/faker": "^10.2.0",
+    "@tanstack/eslint-config": "0.3.4",
+    "@tanstack/typedoc-config": "0.3.3",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@types/node": "^25.0.7",
+    "eslint": "^9.39.2",
+    "eslint-plugin-unused-imports": "^4.3.0",
+    "happy-dom": "^20.1.0",
+    "knip": "^5.80.2",
+    "markdown-link-extractor": "^4.0.3",
+    "nx": "^22.3.3",
+    "premove": "^4.0.0",
+    "prettier": "^3.7.4",
+    "prettier-plugin-svelte": "^3.4.1",
+    "publint": "^0.3.16",
+    "sherif": "^1.9.0",
+    "tinyglobby": "^0.2.15",
+    "tsdown": "^0.19.0",
+    "typescript": "5.9.3",
+    "vite-tsconfig-paths": "^6.1.1",
+    "vitest": "^4.0.17"
+  },
+  "dependencies": {
+    "@js-temporal/polyfill": "^0.5.1"
+  }
+}
diff --git a/packages/react-time-devtools/README.md b/packages/react-time-devtools/README.md
new file mode 100644
index 00000000..7ecd7e46
--- /dev/null
+++ b/packages/react-time-devtools/README.md
@@ -0,0 +1,3 @@
+# time
+
+🤖⏰ Headless utilities for building time and calendar components in TS/JS, React, Solid, Vue, Svelte and Angular
diff --git a/packages/react-time-devtools/eslint.config.js b/packages/react-time-devtools/eslint.config.js
new file mode 100644
index 00000000..21ee9b63
--- /dev/null
+++ b/packages/react-time-devtools/eslint.config.js
@@ -0,0 +1,33 @@
+// @ts-check
+
+import pluginReact from '@eslint-react/eslint-plugin'
+import pluginReactCompiler from 'eslint-plugin-react-compiler'
+import pluginReactHooks from 'eslint-plugin-react-hooks'
+import rootConfig from '../../eslint.config.js'
+
+/** @type {any[]} */
+export default [
+  ...rootConfig,
+  {
+    files: ['**/*.{ts,tsx}'],
+    ...pluginReact.configs.recommended,
+  },
+  {
+    plugins: {
+      'react-hooks': pluginReactHooks,
+      'react-compiler': pluginReactCompiler,
+    },
+    rules: {
+      '@eslint-react/dom/no-missing-button-type': 'off',
+      'react-compiler/react-compiler': 'error',
+      'react-hooks/exhaustive-deps': 'error',
+      'react-hooks/rules-of-hooks': 'error',
+    },
+  },
+  {
+    files: ['**/__tests__/**'],
+    rules: {
+      // 'react-compiler/react-compiler': 'off',
+    },
+  },
+]
diff --git a/packages/react-time-devtools/package.json b/packages/react-time-devtools/package.json
new file mode 100644
index 00000000..c408289d
--- /dev/null
+++ b/packages/react-time-devtools/package.json
@@ -0,0 +1,67 @@
+{
+  "name": "@tanstack/react-time-devtools",
+  "version": "0.0.0",
+  "description": "React devtools for TanStack time",
+  "author": "Tanner Linsley",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/TanStack/time.git",
+    "directory": "packages/react-time-devtools"
+  },
+  "homepage": "https://tanstack.com/time",
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/tannerlinsley"
+  },
+  "keywords": [
+    "react",
+    "tanstack",
+    "time",
+    "devtools"
+  ],
+  "scripts": {
+    "clean": "premove ./build ./dist",
+    "test:eslint": "eslint ./src",
+    "test:lib": "vitest --passWithNoTests",
+    "test:lib:dev": "pnpm test:lib --watch",
+    "test:types": "tsc",
+    "build": "tsdown"
+  },
+  "type": "module",
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.cts",
+  "exports": {
+    ".": {
+      "require": "./dist/index.cjs",
+      "import": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "sideEffects": false,
+  "engines": {
+    "node": ">=18"
+  },
+  "files": [
+    "dist",
+    "src"
+  ],
+  "dependencies": {
+    "@tanstack/devtools-utils": "^0.4.0",
+    "@tanstack/time-devtools": "workspace:*"
+  },
+  "devDependencies": {
+    "@eslint-react/eslint-plugin": "^2.7.2",
+    "@types/react": "^19.2.8",
+    "@vitejs/plugin-react": "^5.1.2",
+    "eslint-plugin-react-compiler": "19.1.0-rc.2",
+    "eslint-plugin-react-hooks": "^7.0.1",
+    "react": "^19.2.3",
+    "solid-js": "^1.9.10"
+  },
+  "peerDependencies": {
+    "react": ">=16.8",
+    "react-dom": ">=16.8"
+  }
+}
diff --git a/packages/react-time-devtools/src/TimeDevtools.tsx b/packages/react-time-devtools/src/TimeDevtools.tsx
new file mode 100644
index 00000000..4fe0d008
--- /dev/null
+++ b/packages/react-time-devtools/src/TimeDevtools.tsx
@@ -0,0 +1,33 @@
+import React, { useEffect, useRef } from 'react'
+import { TimeDevtoolsCore } from '@tanstack/time-devtools'
+import type { DevtoolsPanelProps } from '@tanstack/devtools-utils/react'
+
+export interface TimeDevtoolsReactInit extends DevtoolsPanelProps {}
+
+function TimeDevtoolsPanel(props: TimeDevtoolsReactInit) {
+  const containerRef = useRef<HTMLDivElement>(null)
+  const devtoolsRef = useRef<InstanceType<typeof TimeDevtoolsCore> | null>(null)
+
+  useEffect(() => {
+    if (containerRef.current && !devtoolsRef.current) {
+      const devtools = new TimeDevtoolsCore()
+      devtoolsRef.current = devtools
+      devtools.mount(containerRef.current, props.theme ?? 'dark')
+    }
+
+    return () => {
+      if (devtoolsRef.current) {
+        devtoolsRef.current.unmount()
+        devtoolsRef.current = null
+      }
+    }
+  }, [props.theme])
+
+  return <div ref={containerRef} style={{ height: '100%' }} />
+}
+
+function TimeDevtoolsPanelNoOp(_props: TimeDevtoolsReactInit) {
+  return null
+}
+
+export { TimeDevtoolsPanel, TimeDevtoolsPanelNoOp }
diff --git a/packages/react-time-devtools/src/index.ts b/packages/react-time-devtools/src/index.ts
new file mode 100644
index 00000000..3e243364
--- /dev/null
+++ b/packages/react-time-devtools/src/index.ts
@@ -0,0 +1,19 @@
+'use client'
+
+import type { createSolidPanel } from '@tanstack/devtools-utils/solid'
+import * as Devtools from './TimeDevtools'
+import * as plugin from './plugin'
+
+type SolidPanelComponent = ReturnType<typeof createSolidPanel>[0]
+
+export const TimeDevtoolsPanel: SolidPanelComponent =
+  process.env.NODE_ENV !== 'development'
+    ? Devtools.TimeDevtoolsPanelNoOp
+    : Devtools.TimeDevtoolsPanel
+
+export const timeDevtoolsPlugin =
+  process.env.NODE_ENV !== 'development'
+    ? plugin.timeDevtoolsNoOpPlugin
+    : plugin.timeDevtoolsPlugin
+
+export type { TimeDevtoolsReactInit } from './TimeDevtools'
diff --git a/packages/react-time-devtools/src/plugin.tsx b/packages/react-time-devtools/src/plugin.tsx
new file mode 100644
index 00000000..e72c459b
--- /dev/null
+++ b/packages/react-time-devtools/src/plugin.tsx
@@ -0,0 +1,11 @@
+import { createReactPlugin } from '@tanstack/devtools-utils/react'
+import { TimeDevtoolsPanel } from './TimeDevtools'
+
+const [timeDevtoolsPlugin, timeDevtoolsNoOpPlugin] = createReactPlugin({
+  Component: TimeDevtoolsPanel,
+  name: 'TanStack Time',
+  id: 'tanstack-time',
+  defaultOpen: true,
+})
+
+export { timeDevtoolsPlugin, timeDevtoolsNoOpPlugin }
diff --git a/packages/react-time-devtools/src/production.ts b/packages/react-time-devtools/src/production.ts
new file mode 100644
index 00000000..2d89b9fb
--- /dev/null
+++ b/packages/react-time-devtools/src/production.ts
@@ -0,0 +1,7 @@
+'use client'
+
+export { TimeDevtoolsPanel } from './TimeDevtools'
+
+export type { TimeDevtoolsReactInit } from './TimeDevtools'
+
+export { TimeDevtoolsPlugin } from './plugin'
diff --git a/packages/react-time-devtools/tsconfig.json b/packages/react-time-devtools/tsconfig.json
new file mode 100644
index 00000000..c8d3e73b
--- /dev/null
+++ b/packages/react-time-devtools/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["src", "vitest.config.ts", "tests"],
+  "exclude": ["eslint.config.js"],
+  "compilerOptions": {
+    "jsx": "react"
+  }
+}
diff --git a/packages/react-time-devtools/tsdown.config.ts b/packages/react-time-devtools/tsdown.config.ts
new file mode 100644
index 00000000..deee810d
--- /dev/null
+++ b/packages/react-time-devtools/tsdown.config.ts
@@ -0,0 +1,19 @@
+import { defineConfig } from 'tsdown'
+
+export default defineConfig({
+  entry: ['./src/index.ts'],
+  format: ['esm', 'cjs'],
+  unbundle: true,
+  dts: true,
+  sourcemap: true,
+  clean: true,
+  minify: false,
+  fixedExtension: false,
+  exports: true,
+  esbuild: {
+    jsx: 'automatic',
+  },
+  publint: {
+    strict: true,
+  },
+})
diff --git a/packages/react-time-devtools/vitest.config.ts b/packages/react-time-devtools/vitest.config.ts
new file mode 100644
index 00000000..c38045f3
--- /dev/null
+++ b/packages/react-time-devtools/vitest.config.ts
@@ -0,0 +1,14 @@
+import { defineConfig } from 'vitest/config'
+import react from '@vitejs/plugin-react'
+import packageJson from './package.json' with { type: 'json' }
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    name: packageJson.name,
+    dir: './',
+    watch: false,
+    environment: 'happy-dom',
+    globals: true,
+  },
+})
diff --git a/packages/react-time/README.md b/packages/react-time/README.md
new file mode 100644
index 00000000..7ecd7e46
--- /dev/null
+++ b/packages/react-time/README.md
@@ -0,0 +1,3 @@
+# time
+
+🤖⏰ Headless utilities for building time and calendar components in TS/JS, React, Solid, Vue, Svelte and Angular
diff --git a/packages/react-time/eslint.config.js b/packages/react-time/eslint.config.js
new file mode 100644
index 00000000..ec5db3c6
--- /dev/null
+++ b/packages/react-time/eslint.config.js
@@ -0,0 +1,33 @@
+// @ts-check
+
+import pluginReact from '@eslint-react/eslint-plugin'
+import pluginReactCompiler from 'eslint-plugin-react-compiler'
+import pluginReactHooks from 'eslint-plugin-react-hooks'
+import rootConfig from '../../eslint.config.js'
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+  ...rootConfig,
+  {
+    files: ['**/*.{ts,tsx}'],
+    ...pluginReact.configs.recommended,
+  },
+  {
+    plugins: {
+      'react-hooks': pluginReactHooks,
+      'react-compiler': pluginReactCompiler,
+    },
+    rules: {
+      '@eslint-react/dom/no-missing-button-type': 'off',
+      'react-compiler/react-compiler': 'error',
+      'react-hooks/exhaustive-deps': 'error',
+      'react-hooks/rules-of-hooks': 'error',
+    },
+  },
+  {
+    files: ['**/__tests__/**'],
+    rules: {
+      // 'react-compiler/react-compiler': 'off',
+    },
+  },
+]
diff --git a/packages/react-time/package.json b/packages/react-time/package.json
new file mode 100644
index 00000000..a124e084
--- /dev/null
+++ b/packages/react-time/package.json
@@ -0,0 +1,66 @@
+{
+  "name": "@tanstack/react-time",
+  "version": "0.0.0",
+  "description": "React adapter for TanStack Time",
+  "author": "Tanner Linsley",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/TanStack/time.git",
+    "directory": "packages/react-time"
+  },
+  "homepage": "https://tanstack.com/time",
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/tannerlinsley"
+  },
+  "keywords": [
+    "react",
+    "tanstack",
+    "time"
+  ],
+  "scripts": {
+    "clean": "premove ./build ./dist",
+    "test:eslint": "eslint ./src",
+    "test:lib": "vitest --passWithNoTests",
+    "test:lib:dev": "pnpm test:lib --watch",
+    "test:types": "tsc",
+    "build": "tsdown"
+  },
+  "type": "module",
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.cts",
+  "exports": {
+    ".": {
+      "require": "./dist/index.cjs",
+      "import": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "sideEffects": false,
+  "engines": {
+    "node": ">=18"
+  },
+  "files": [
+    "dist",
+    "src"
+  ],
+  "dependencies": {
+    "@tanstack/react-store": "^0.8.0",
+    "@tanstack/time": "workspace:*"
+  },
+  "devDependencies": {
+    "@eslint-react/eslint-plugin": "^2.7.2",
+    "@testing-library/react": "^16.1.0",
+    "@types/react": "^19.2.8",
+    "@vitejs/plugin-react": "^5.1.2",
+    "eslint-plugin-react-compiler": "19.1.0-rc.2",
+    "eslint-plugin-react-hooks": "^7.0.1",
+    "react": "^19.2.3"
+  },
+  "peerDependencies": {
+    "react": ">=16.8",
+    "react-dom": ">=16.8"
+  }
+}
diff --git a/packages/react-time/src/index.ts b/packages/react-time/src/index.ts
new file mode 100644
index 00000000..04a047db
--- /dev/null
+++ b/packages/react-time/src/index.ts
@@ -0,0 +1,37 @@
+export { useCalendar } from './useCalendar'
+export type {
+  ResizeState,
+  ResizeOptions,
+  UseCalendarOptions,
+} from './useCalendar'
+
+// Re-export ResizeError and AvailabilityConflict from core package
+export type {
+  ResizeError,
+  AvailabilityConflict,
+  UnavailabilityReason,
+  SaveEventResult,
+} from '@tanstack/time'
+
+export {
+  calculateGhostPreviewStyle,
+  calculateSegmentResizePreview,
+  calculateTimelineResizePreview,
+  formatEventTimeRange,
+  getEventDisplayTimeRange,
+  getSegmentInfo,
+  isMultiDayEvent,
+} from '@tanstack/time'
+
+export type {
+  EventTimeRange,
+  FormatEventTimeOptions,
+  FormattedEventTime,
+  GhostPreviewOptions,
+  PositionStyle,
+  ResizePreviewOptions,
+  SegmentInfo,
+  SegmentResizePreview,
+  TimelineResizePreviewOptions,
+  TimelineResizePreviewStyle,
+} from '@tanstack/time'
diff --git a/packages/react-time/src/useCalendar/index.ts b/packages/react-time/src/useCalendar/index.ts
new file mode 100644
index 00000000..2f96372e
--- /dev/null
+++ b/packages/react-time/src/useCalendar/index.ts
@@ -0,0 +1,7 @@
+export { useCalendar } from './useCalendar'
+export type {
+  ResizeState,
+  ResizeOptions,
+  UseCalendarOptions,
+} from './useCalendar'
+export type { ResizeError } from '@tanstack/time'
diff --git a/packages/react-time/src/useCalendar/useCalendar.ts b/packages/react-time/src/useCalendar/useCalendar.ts
new file mode 100644
index 00000000..d85360b7
--- /dev/null
+++ b/packages/react-time/src/useCalendar/useCalendar.ts
@@ -0,0 +1,448 @@
+import {
+  useCallback,
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
+  useSyncExternalStore,
+  useTransition,
+} from 'react'
+import { useStore } from '@tanstack/react-store'
+import { CalendarCore } from '@tanstack/time'
+import type {
+  CalendarApi,
+  CalendarCoreOptions,
+  DependencyType,
+  RecurrenceEditScope,
+  Event,
+  EventDateTimeInput,
+  EventDependency,
+  ResizeController,
+  ResizeControllerOptions,
+  ResizeEdge,
+  ResizeState,
+  Resource,
+} from '@tanstack/time'
+
+export type { ResizeState } from '@tanstack/time'
+
+/**
+ * Hook-level resize options. Identical to `ResizeControllerOptions` from core
+ * but re-exported under a React-friendly name for backwards compatibility.
+ */
+export type ResizeOptions = ResizeControllerOptions
+
+interface ResizeHandleHandlers {
+  onMouseDown: (e: React.MouseEvent) => void
+}
+
+interface ResizeHandleOptions {
+  occurrenceStart?: EventDateTimeInput
+  recurrenceScope?: RecurrenceEditScope
+}
+
+interface DayColumnProps {
+  ref: (element: HTMLElement | null) => void
+}
+
+export interface UseCalendarOptions<
+  TResource extends Resource,
+  TEvent extends Event<TResource>,
+> extends CalendarCoreOptions<TResource, TEvent> {
+  resize?: ResizeOptions
+}
+
+export const useCalendar = <
+  TResource extends Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+>(
+  options: UseCalendarOptions<TResource, TEvent>,
+): CalendarApi<TResource, TEvent> & {
+  isPending: boolean
+  resizeState: ResizeState
+  getResizeHandleProps: (
+    eventId: string,
+    edge: ResizeEdge,
+    originalStart: string,
+    originalEnd: string,
+    options?: ResizeHandleOptions,
+  ) => ResizeHandleHandlers
+  getDayColumnProps: (dayDate: string) => DayColumnProps
+} => {
+  const { resize, ...calendarOptions } = options
+
+  const [calendarCore] = useState(
+    () => new CalendarCore<TResource, TEvent>(calendarOptions),
+  )
+  const state = useStore(calendarCore.store)
+  const [isTransitionPending, startTransition] = useTransition()
+  const isPending = isTransitionPending || state.isPending
+
+  useEffect(() => {
+    calendarCore.ensureRangeLoaded()
+  }, [calendarCore, state.currentPeriod, state.viewMode, state.activeDate])
+
+  const [resizeController] = useState<ResizeController<TResource, TEvent>>(() =>
+    calendarCore.createResizeController(resize),
+  )
+
+  useEffect(() => {
+    resizeController.setOptions(resize ?? {})
+  }, [resizeController, resize])
+
+  useEffect(() => {
+    return () => {
+      resizeController.destroy()
+    }
+  }, [resizeController])
+
+  const resizeState = useSyncExternalStore(
+    resizeController.subscribe,
+    resizeController.getSnapshot,
+    resizeController.getSnapshot,
+  )
+
+  const resizeHandlePropsCacheRef = useRef(
+    new Map<string, ResizeHandleHandlers>(),
+  )
+  const dayColumnPropsCacheRef = useRef(new Map<string, DayColumnProps>())
+
+  const getResizeHandleProps = useCallback(
+    (
+      eventId: string,
+      edge: ResizeEdge,
+      originalStart: string,
+      originalEnd: string,
+      handleOptions?: ResizeHandleOptions,
+    ): ResizeHandleHandlers => {
+      const key = `${eventId}|${edge}|${originalStart}|${originalEnd}|${handleOptions?.occurrenceStart ?? ''}|${handleOptions?.recurrenceScope ?? ''}`
+      const cache = resizeHandlePropsCacheRef.current
+      const cached = cache.get(key)
+      if (cached) return cached
+
+      const handlers: ResizeHandleHandlers = {
+        onMouseDown: (e: React.MouseEvent) => {
+          const started = resizeController.start({
+            eventId,
+            edge,
+            originalStart,
+            originalEnd,
+            occurrenceStart: handleOptions?.occurrenceStart,
+            recurrenceScope: handleOptions?.recurrenceScope,
+            clientX: e.clientX,
+            clientY: e.clientY,
+            target: e.target as HTMLElement | null,
+          })
+          if (!started) return
+
+          e.preventDefault()
+          e.stopPropagation()
+        },
+      }
+
+      cache.set(key, handlers)
+      return handlers
+    },
+    [resizeController],
+  )
+
+  const getDayColumnProps = useCallback(
+    (dayDate: string): DayColumnProps => {
+      const cache = dayColumnPropsCacheRef.current
+      const cached = cache.get(dayDate)
+      if (cached) return cached
+      const props: DayColumnProps = {
+        ref: (element: HTMLElement | null) => {
+          resizeController.registerDayColumn(dayDate, element)
+        },
+      }
+      cache.set(dayDate, props)
+      return props
+    },
+    [resizeController],
+  )
+
+  const goToPreviousPeriod = useCallback<
+    typeof calendarCore.goToPreviousPeriod
+  >(() => {
+    startTransition(() => {
+      calendarCore.goToPreviousPeriod()
+    })
+  }, [calendarCore, startTransition])
+
+  const goToNextPeriod = useCallback<typeof calendarCore.goToNextPeriod>(() => {
+    startTransition(() => {
+      calendarCore.goToNextPeriod()
+    })
+  }, [calendarCore, startTransition])
+
+  const goToCurrentPeriod = useCallback<
+    typeof calendarCore.goToCurrentPeriod
+  >(() => {
+    startTransition(() => {
+      calendarCore.goToCurrentPeriod()
+    })
+  }, [calendarCore, startTransition])
+
+  const goToSpecificPeriod = useCallback<
+    typeof calendarCore.goToSpecificPeriod
+  >(
+    (date) => {
+      startTransition(() => {
+        calendarCore.goToSpecificPeriod(date)
+      })
+    },
+    [calendarCore, startTransition],
+  )
+
+  const changeViewMode = useCallback<typeof calendarCore.changeViewMode>(
+    (newViewMode) => {
+      startTransition(() => {
+        calendarCore.changeViewMode(newViewMode)
+      })
+    },
+    [calendarCore, startTransition],
+  )
+
+  const getEventProps = useCallback<typeof calendarCore.getEventProps>(
+    (id) => calendarCore.getEventProps(id),
+    [calendarCore],
+  )
+
+  const groupDaysBy = useCallback<typeof calendarCore.groupDaysBy>(
+    (props) => calendarCore.groupDaysBy(props),
+    [calendarCore],
+  )
+
+  const getDaysNames = useCallback<typeof calendarCore.getDaysNames>(
+    (props) => calendarCore.getDaysNames(props),
+    [calendarCore],
+  )
+
+  const getTimeSlots = useCallback<typeof calendarCore.getTimeSlots>(
+    (slotOptions) => calendarCore.getTimeSlots(slotOptions),
+    [calendarCore],
+  )
+
+  const getEventsByDate = useCallback<typeof calendarCore.getEventsByDate>(
+    (date) => calendarCore.getEventsByDate(date),
+    [calendarCore],
+  )
+
+  const getAllDayEventsByDate = useCallback<
+    typeof calendarCore.getAllDayEventsByDate
+  >((date) => calendarCore.getAllDayEventsByDate(date), [calendarCore])
+
+  const canGoPreviousPeriod = useCallback<
+    typeof calendarCore.canGoPreviousPeriod
+  >(() => calendarCore.canGoPreviousPeriod(), [calendarCore])
+
+  const canGoNextPeriod = useCallback<typeof calendarCore.canGoNextPeriod>(
+    () => calendarCore.canGoNextPeriod(),
+    [calendarCore],
+  )
+
+  const addEvent = useCallback<typeof calendarCore.addEvent>(
+    (event, addOptions) => calendarCore.addEvent(event, addOptions),
+    [calendarCore],
+  )
+
+  const editEvent = useCallback<typeof calendarCore.editEvent>(
+    (eventId, updates, editOptions) =>
+      calendarCore.editEvent(eventId, updates, editOptions),
+    [calendarCore],
+  )
+
+  const editRecurringEvent = useCallback<
+    typeof calendarCore.editRecurringEvent
+  >(
+    (eventId, updates, editOptions) =>
+      calendarCore.editRecurringEvent(eventId, updates, editOptions),
+    [calendarCore],
+  )
+
+  const removeRecurringEvent = useCallback<
+    typeof calendarCore.removeRecurringEvent
+  >(
+    (eventId, removeOptions) =>
+      calendarCore.removeRecurringEvent(eventId, removeOptions),
+    [calendarCore],
+  )
+  const removeEvent = useCallback<typeof calendarCore.removeEvent>(
+    (id) => calendarCore.removeEvent(id),
+    [calendarCore],
+  )
+
+  const containerHeight = resize?.containerHeight ?? 0
+
+  const getUnavailableRanges = useCallback<
+    typeof calendarCore.getUnavailableRanges
+  >(
+    (date, rangeOptions) =>
+      calendarCore.getUnavailableRanges(date, {
+        containerHeight: rangeOptions?.containerHeight ?? containerHeight,
+        resourceIds: rangeOptions?.resourceIds,
+      }),
+    [calendarCore, containerHeight],
+  )
+
+  const getEventsByResource = useCallback<
+    typeof calendarCore.getEventsByResource
+  >(() => calendarCore.getEventsByResource(), [calendarCore])
+
+  const getTimelineLayout = useCallback<typeof calendarCore.getTimelineLayout>(
+    () => calendarCore.getTimelineLayout(),
+    [calendarCore],
+  )
+
+  const getEvents = useCallback<typeof calendarCore.getEvents>(
+    () => calendarCore.getEvents(),
+    [calendarCore],
+  )
+
+  const validateMove = useCallback<typeof calendarCore.validateMove>(
+    (eventId, newStart, newEnd, newResources) =>
+      calendarCore.validateMove(eventId, newStart, newEnd, newResources),
+    [calendarCore],
+  )
+
+  const validateEventDependencies = useCallback(
+    (
+      event: { id?: string; title: string; start: string; end: string },
+      dependsOn: Array<EventDependency>,
+    ) => calendarCore.validateEventDependencies(event, dependsOn),
+    [calendarCore],
+  )
+
+  const createDependency = useCallback(
+    (sourceId: string, targetId: string, type?: DependencyType) =>
+      calendarCore.createDependency(sourceId, targetId, type),
+    [calendarCore],
+  )
+
+  const goToNextOccurrence = useCallback(
+    (eventId: string, fromDate?: EventDateTimeInput) => {
+      startTransition(() => {
+        calendarCore.goToNextOccurrence(eventId, fromDate)
+      })
+    },
+    [calendarCore, startTransition],
+  )
+
+  const goToPreviousOccurrence = useCallback(
+    (eventId: string, fromDate?: EventDateTimeInput) => {
+      startTransition(() => {
+        calendarCore.goToPreviousOccurrence(eventId, fromDate)
+      })
+    },
+    [calendarCore, startTransition],
+  )
+
+  const getMasterEvent = useCallback<typeof calendarCore.getMasterEvent>(
+    (event) => calendarCore.getMasterEvent(event),
+    [calendarCore],
+  )
+
+  const undo = useCallback(() => calendarCore.undo(), [calendarCore])
+  const redo = useCallback(() => calendarCore.redo(), [calendarCore])
+  const canUndo = useCallback(() => calendarCore.canUndo(), [calendarCore])
+  const canRedo = useCallback(() => calendarCore.canRedo(), [calendarCore])
+
+  const fetchEventsForRange = useCallback<
+    typeof calendarCore.fetchEventsForRange
+  >(
+    (start, end) => calendarCore.fetchEventsForRange(start, end),
+    [calendarCore],
+  )
+
+  const validateEventPlacement = useCallback<
+    typeof calendarCore.validateEventPlacement
+  >((event) => calendarCore.validateEventPlacement(event), [calendarCore])
+
+  const formatPeriodLabel = useCallback<typeof calendarCore.formatPeriodLabel>(
+    (labelOptions) => calendarCore.formatPeriodLabel(labelOptions),
+    [calendarCore],
+  )
+
+  const formatCurrentPeriod = useCallback<
+    typeof calendarCore.formatCurrentPeriod
+  >(
+    (labelOptions) => calendarCore.formatCurrentPeriod(labelOptions),
+    [calendarCore],
+  )
+
+  const getEventSegmentInfo = useCallback<
+    typeof calendarCore.getEventSegmentInfo
+  >((event) => calendarCore.getEventSegmentInfo(event), [calendarCore])
+
+  const days = useMemo(() => {
+    void state
+    return calendarCore.getDaysWithEvents()
+  }, [calendarCore, state])
+
+  const getDaysInRange = useCallback<typeof calendarCore.getDaysInRange>(
+    (start, end) => calendarCore.getDaysInRange(start, end),
+    [calendarCore],
+  )
+
+  const setResources = useCallback<typeof calendarCore.setResources>(
+    (resources) => calendarCore.setResources(resources),
+    [calendarCore],
+  )
+
+  const setEvents = useCallback<typeof calendarCore.setEvents>(
+    (events) => calendarCore.setEvents(events),
+    [calendarCore],
+  )
+
+  return {
+    activeDate: state.activeDate.toString(),
+    currentPeriod: state.currentPeriod.toString(),
+    viewMode: state.viewMode,
+    days,
+    getDaysInRange,
+    getDaysNames,
+    getTimeSlots,
+    getEventsByDate,
+    getAllDayEventsByDate,
+    goToPreviousPeriod,
+    goToNextPeriod,
+    goToCurrentPeriod,
+    goToSpecificPeriod,
+    canGoPreviousPeriod,
+    canGoNextPeriod,
+    changeViewMode,
+    getEventProps,
+    addEvent,
+    editEvent,
+    editRecurringEvent,
+    removeEvent,
+    removeRecurringEvent,
+    isPending,
+    groupDaysBy,
+    resizeState,
+    getResizeHandleProps,
+    getDayColumnProps,
+    getUnavailableRanges,
+    getEventsByResource,
+    getTimelineLayout,
+    getEvents,
+    validateMove,
+    validateEventDependencies,
+    createDependency,
+    fetchEventsForRange,
+    validateEventPlacement,
+    formatPeriodLabel,
+    formatCurrentPeriod,
+    getEventSegmentInfo,
+    undo,
+    redo,
+    canUndo,
+    canRedo,
+    goToNextOccurrence,
+    goToPreviousOccurrence,
+    getMasterEvent,
+    setResources,
+    setEvents,
+  }
+}
diff --git a/packages/react-time/tsconfig.docs.json b/packages/react-time/tsconfig.docs.json
new file mode 100644
index 00000000..5e8130dc
--- /dev/null
+++ b/packages/react-time/tsconfig.docs.json
@@ -0,0 +1,9 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "paths": {
+      "@tanstack/time": ["../time/src"]
+    }
+  },
+  "include": ["src"]
+}
diff --git a/packages/react-time/tsconfig.json b/packages/react-time/tsconfig.json
new file mode 100644
index 00000000..98bb38df
--- /dev/null
+++ b/packages/react-time/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "jsx": "react"
+  },
+  "include": ["src", "vitest.config.ts", "tests"],
+  "exclude": ["eslint.config.js"]
+}
diff --git a/packages/react-time/tsdown.config.ts b/packages/react-time/tsdown.config.ts
new file mode 100644
index 00000000..71071cb9
--- /dev/null
+++ b/packages/react-time/tsdown.config.ts
@@ -0,0 +1,16 @@
+import { defineConfig } from 'tsdown'
+
+export default defineConfig({
+  entry: ['./src/index.ts'],
+  format: ['esm', 'cjs'],
+  unbundle: true,
+  dts: true,
+  sourcemap: true,
+  clean: true,
+  minify: false,
+  fixedExtension: false,
+  exports: true,
+  publint: {
+    strict: true,
+  },
+})
diff --git a/packages/react-time/vitest.config.ts b/packages/react-time/vitest.config.ts
new file mode 100644
index 00000000..17c7df03
--- /dev/null
+++ b/packages/react-time/vitest.config.ts
@@ -0,0 +1,14 @@
+import { defineConfig } from 'vitest/config'
+import react from '@vitejs/plugin-react'
+import packageJson from './package.json' with { type: 'json' }
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    name: packageJson.name,
+    dir: './tests',
+    watch: false,
+    environment: 'happy-dom',
+    globals: true,
+  },
+})
diff --git a/packages/solid-time-devtools/README.md b/packages/solid-time-devtools/README.md
new file mode 100644
index 00000000..7ecd7e46
--- /dev/null
+++ b/packages/solid-time-devtools/README.md
@@ -0,0 +1,3 @@
+# time
+
+🤖⏰ Headless utilities for building time and calendar components in TS/JS, React, Solid, Vue, Svelte and Angular
diff --git a/packages/solid-time-devtools/eslint.config.js b/packages/solid-time-devtools/eslint.config.js
new file mode 100644
index 00000000..c61c24df
--- /dev/null
+++ b/packages/solid-time-devtools/eslint.config.js
@@ -0,0 +1,11 @@
+// @ts-check
+
+import rootConfig from '../../eslint.config.js'
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+  ...rootConfig,
+  {
+    rules: {},
+  },
+]
diff --git a/packages/solid-time-devtools/package.json b/packages/solid-time-devtools/package.json
new file mode 100644
index 00000000..420424fe
--- /dev/null
+++ b/packages/solid-time-devtools/package.json
@@ -0,0 +1,61 @@
+{
+  "name": "@tanstack/solid-time-devtools",
+  "version": "0.0.0",
+  "description": "Solid devtools for TanStack Time",
+  "author": "Tanner Linsley",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/TanStack/time.git",
+    "directory": "packages/solid-time-devtools"
+  },
+  "homepage": "https://tanstack.com/time",
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/tannerlinsley"
+  },
+  "keywords": [
+    "solid",
+    "tanstack",
+    "time",
+    "devtools"
+  ],
+  "scripts": {
+    "clean": "premove ./build ./dist",
+    "test:eslint": "eslint ./src",
+    "test:lib": "vitest --passWithNoTests",
+    "test:lib:dev": "pnpm test:lib --watch",
+    "test:types": "tsc",
+    "build": "tsdown"
+  },
+  "type": "module",
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.cts",
+  "exports": {
+    ".": {
+      "require": "./dist/index.cjs",
+      "import": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "sideEffects": false,
+  "engines": {
+    "node": ">=18"
+  },
+  "files": [
+    "dist",
+    "src"
+  ],
+  "dependencies": {
+    "@tanstack/devtools-utils": "^0.4.0",
+    "@tanstack/time-devtools": "workspace:*"
+  },
+  "devDependencies": {
+    "solid-js": "^1.9.10",
+    "vite-plugin-solid": "^2.11.10"
+  },
+  "peerDependencies": {
+    "solid-js": ">=1.9.5"
+  }
+}
diff --git a/packages/solid-time-devtools/src/TimeDevtools.tsx b/packages/solid-time-devtools/src/TimeDevtools.tsx
new file mode 100644
index 00000000..114cb714
--- /dev/null
+++ b/packages/solid-time-devtools/src/TimeDevtools.tsx
@@ -0,0 +1,10 @@
+import { createSolidPanel } from '@tanstack/devtools-utils/solid'
+import { TimeDevtoolsCore } from '@tanstack/time-devtools'
+import type { DevtoolsPanelProps } from '@tanstack/devtools-utils/solid'
+
+const [TimeDevtoolsPanel, TimeDevtoolsPanelNoOp] =
+  createSolidPanel(TimeDevtoolsCore)
+
+export interface TimeDevtoolsSolidInit extends DevtoolsPanelProps {}
+
+export { TimeDevtoolsPanel, TimeDevtoolsPanelNoOp }
diff --git a/packages/solid-time-devtools/src/index.ts b/packages/solid-time-devtools/src/index.ts
new file mode 100644
index 00000000..3e76650f
--- /dev/null
+++ b/packages/solid-time-devtools/src/index.ts
@@ -0,0 +1,14 @@
+import * as Devtools from './TimeDevtools'
+import * as plugin from './plugin'
+
+export const TimeDevtools =
+  process.env.NODE_ENV !== 'development'
+    ? Devtools.TimeDevtoolsPanelNoOp
+    : Devtools.TimeDevtoolsPanel
+
+export const timeDevtoolsPlugin =
+  process.env.NODE_ENV !== 'development'
+    ? plugin.timeDevtoolsNoOpPlugin
+    : plugin.timeDevtoolsPlugin
+
+export type { TimeDevtoolsSolidInit } from './TimeDevtools'
diff --git a/packages/solid-time-devtools/src/plugin.tsx b/packages/solid-time-devtools/src/plugin.tsx
new file mode 100644
index 00000000..21b1d91f
--- /dev/null
+++ b/packages/solid-time-devtools/src/plugin.tsx
@@ -0,0 +1,11 @@
+import { createSolidPlugin } from '@tanstack/devtools-utils/solid'
+import { TimeDevtoolsPanel } from './TimeDevtools'
+
+const [timeDevtoolsPlugin, timeDevtoolsNoOpPlugin] = createSolidPlugin({
+  Component: TimeDevtoolsPanel,
+  name: 'TanStack Time',
+  id: 'tanstack-time',
+  defaultOpen: true,
+})
+
+export { timeDevtoolsPlugin, timeDevtoolsNoOpPlugin }
diff --git a/packages/solid-time-devtools/src/production.ts b/packages/solid-time-devtools/src/production.ts
new file mode 100644
index 00000000..50304211
--- /dev/null
+++ b/packages/solid-time-devtools/src/production.ts
@@ -0,0 +1,5 @@
+export { TimeDevtoolsPanel } from './TimeDevtools'
+
+export type { TimeDevtoolsSolidInit } from './TimeDevtools'
+
+export { timeDevtoolsPlugin } from './plugin'
diff --git a/packages/solid-time-devtools/tsconfig.json b/packages/solid-time-devtools/tsconfig.json
new file mode 100644
index 00000000..aa58368e
--- /dev/null
+++ b/packages/solid-time-devtools/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["src", "vitest.config.ts", "tests"],
+  "exclude": ["eslint.config.js"],
+  "compilerOptions": {
+    "jsx": "preserve",
+    "jsxImportSource": "solid-js"
+  }
+}
diff --git a/packages/solid-time-devtools/tsdown.config.ts b/packages/solid-time-devtools/tsdown.config.ts
new file mode 100644
index 00000000..71071cb9
--- /dev/null
+++ b/packages/solid-time-devtools/tsdown.config.ts
@@ -0,0 +1,16 @@
+import { defineConfig } from 'tsdown'
+
+export default defineConfig({
+  entry: ['./src/index.ts'],
+  format: ['esm', 'cjs'],
+  unbundle: true,
+  dts: true,
+  sourcemap: true,
+  clean: true,
+  minify: false,
+  fixedExtension: false,
+  exports: true,
+  publint: {
+    strict: true,
+  },
+})
diff --git a/packages/solid-time-devtools/vitest.config.ts b/packages/solid-time-devtools/vitest.config.ts
new file mode 100644
index 00000000..7a911fa1
--- /dev/null
+++ b/packages/solid-time-devtools/vitest.config.ts
@@ -0,0 +1,14 @@
+import { defineConfig } from 'vitest/config'
+import solid from 'vite-plugin-solid'
+import packageJson from './package.json' with { type: 'json' }
+
+export default defineConfig({
+  plugins: [solid()],
+  test: {
+    name: packageJson.name,
+    dir: './',
+    watch: false,
+    environment: 'happy-dom',
+    globals: true,
+  },
+})
diff --git a/packages/solid-time/README.md b/packages/solid-time/README.md
new file mode 100644
index 00000000..7ecd7e46
--- /dev/null
+++ b/packages/solid-time/README.md
@@ -0,0 +1,3 @@
+# time
+
+🤖⏰ Headless utilities for building time and calendar components in TS/JS, React, Solid, Vue, Svelte and Angular
diff --git a/packages/solid-time/eslint.config.js b/packages/solid-time/eslint.config.js
new file mode 100644
index 00000000..b67a469d
--- /dev/null
+++ b/packages/solid-time/eslint.config.js
@@ -0,0 +1,19 @@
+// @ts-check
+
+import rootConfig from '../../eslint.config.js'
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+  ...rootConfig,
+  {
+    files: ['**/*.{ts,tsx}'],
+  },
+  {
+    plugins: {},
+    rules: {},
+  },
+  {
+    files: ['**/__tests__/**'],
+    rules: {},
+  },
+]
diff --git a/packages/solid-time/package.json b/packages/solid-time/package.json
new file mode 100644
index 00000000..ac6bc489
--- /dev/null
+++ b/packages/solid-time/package.json
@@ -0,0 +1,61 @@
+{
+  "name": "@tanstack/solid-time",
+  "version": "0.0.0",
+  "description": "Solid adapter for TanStack Time",
+  "author": "Tanner Linsley",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/TanStack/time.git",
+    "directory": "packages/solid-time"
+  },
+  "homepage": "https://tanstack.com/time",
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/tannerlinsley"
+  },
+  "keywords": [
+    "solid",
+    "tanstack",
+    "time"
+  ],
+  "scripts": {
+    "clean": "premove ./build ./dist",
+    "test:eslint": "eslint ./src",
+    "test:lib": "vitest --passWithNoTests",
+    "test:lib:dev": "pnpm test:lib --watch",
+    "test:types": "tsc",
+    "build": "tsdown"
+  },
+  "type": "module",
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.cts",
+  "exports": {
+    ".": {
+      "require": "./dist/index.cjs",
+      "import": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "sideEffects": false,
+  "engines": {
+    "node": ">=18"
+  },
+  "files": [
+    "dist",
+    "src"
+  ],
+  "dependencies": {
+    "@tanstack/solid-store": "^0.8.0",
+    "@tanstack/time": "workspace:*"
+  },
+  "devDependencies": {
+    "@types/node": "^25.0.7",
+    "solid-js": "^1.9.10",
+    "vite-plugin-solid": "^2.11.10"
+  },
+  "peerDependencies": {
+    "solid-js": ">=1.9.5"
+  }
+}
diff --git a/packages/solid-time/src/index.ts b/packages/solid-time/src/index.ts
new file mode 100644
index 00000000..e69de29b
diff --git a/packages/solid-time/tsconfig.docs.json b/packages/solid-time/tsconfig.docs.json
new file mode 100644
index 00000000..5e8130dc
--- /dev/null
+++ b/packages/solid-time/tsconfig.docs.json
@@ -0,0 +1,9 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "paths": {
+      "@tanstack/time": ["../time/src"]
+    }
+  },
+  "include": ["src"]
+}
diff --git a/packages/solid-time/tsconfig.json b/packages/solid-time/tsconfig.json
new file mode 100644
index 00000000..6bb0fd91
--- /dev/null
+++ b/packages/solid-time/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "jsx": "preserve",
+    "jsxImportSource": "solid-js"
+  },
+  "include": ["src", "vitest.config.ts", "tests"],
+  "exclude": ["eslint.config.js"]
+}
diff --git a/packages/solid-time/tsdown.config.ts b/packages/solid-time/tsdown.config.ts
new file mode 100644
index 00000000..71071cb9
--- /dev/null
+++ b/packages/solid-time/tsdown.config.ts
@@ -0,0 +1,16 @@
+import { defineConfig } from 'tsdown'
+
+export default defineConfig({
+  entry: ['./src/index.ts'],
+  format: ['esm', 'cjs'],
+  unbundle: true,
+  dts: true,
+  sourcemap: true,
+  clean: true,
+  minify: false,
+  fixedExtension: false,
+  exports: true,
+  publint: {
+    strict: true,
+  },
+})
diff --git a/packages/solid-time/vitest.config.ts b/packages/solid-time/vitest.config.ts
new file mode 100644
index 00000000..7d50e06d
--- /dev/null
+++ b/packages/solid-time/vitest.config.ts
@@ -0,0 +1,14 @@
+import { defineConfig } from 'vitest/config'
+import solid from 'vite-plugin-solid'
+import packageJson from './package.json' with { type: 'json' }
+
+export default defineConfig({
+  plugins: [solid()],
+  test: {
+    name: packageJson.name,
+    dir: './tests',
+    watch: false,
+    environment: 'happy-dom',
+    globals: true,
+  },
+})
diff --git a/packages/time-devtools/README.md b/packages/time-devtools/README.md
new file mode 100644
index 00000000..7ecd7e46
--- /dev/null
+++ b/packages/time-devtools/README.md
@@ -0,0 +1,3 @@
+# time
+
+🤖⏰ Headless utilities for building time and calendar components in TS/JS, React, Solid, Vue, Svelte and Angular
diff --git a/packages/time-devtools/eslint.config.js b/packages/time-devtools/eslint.config.js
new file mode 100644
index 00000000..c61c24df
--- /dev/null
+++ b/packages/time-devtools/eslint.config.js
@@ -0,0 +1,11 @@
+// @ts-check
+
+import rootConfig from '../../eslint.config.js'
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+  ...rootConfig,
+  {
+    rules: {},
+  },
+]
diff --git a/packages/time-devtools/package.json b/packages/time-devtools/package.json
new file mode 100644
index 00000000..5731eaf7
--- /dev/null
+++ b/packages/time-devtools/package.json
@@ -0,0 +1,60 @@
+{
+  "name": "@tanstack/time-devtools",
+  "version": "0.0.0",
+  "description": "Devtools for TanStack Time",
+  "author": "Tanner Linsley",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/TanStack/time.git",
+    "directory": "packages/time-devtools"
+  },
+  "homepage": "https://tanstack.com/time",
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/tannerlinsley"
+  },
+  "keywords": [
+    "tanstack",
+    "time",
+    "devtools"
+  ],
+  "scripts": {
+    "clean": "premove ./build ./dist",
+    "lint:fix": "eslint ./src --fix",
+    "test:eslint": "eslint ./src",
+    "test:lib": "vitest --passWithNoTests",
+    "test:lib:dev": "pnpm test:lib --watch",
+    "test:types": "tsc",
+    "build": "tsdown"
+  },
+  "type": "module",
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.cts",
+  "exports": {
+    ".": {
+      "require": "./dist/index.cjs",
+      "import": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "sideEffects": false,
+  "engines": {
+    "node": ">=18"
+  },
+  "files": [
+    "dist/",
+    "src"
+  ],
+  "dependencies": {
+    "@tanstack/devtools-ui": "^0.5.1",
+    "@tanstack/devtools-utils": "^0.4.0",
+    "@tanstack/time": "workspace:*",
+    "goober": "^2.1.18",
+    "solid-js": "^1.9.10"
+  },
+  "devDependencies": {
+    "rolldown-plugin-solid": "^0.2.1"
+  }
+}
diff --git a/packages/time-devtools/src/components/Shell.tsx b/packages/time-devtools/src/components/Shell.tsx
new file mode 100644
index 00000000..68f011f3
--- /dev/null
+++ b/packages/time-devtools/src/components/Shell.tsx
@@ -0,0 +1,425 @@
+import { For, Show, createMemo, createSignal } from 'solid-js'
+import {
+  Button,
+  Header,
+  HeaderLogo,
+  Input,
+  JsonTree,
+  MainPanel,
+  Tag,
+  X,
+} from '@tanstack/devtools-ui'
+import { useStyles } from '../styles/use-styles'
+import { TimeProvider, useTimeStore } from '../store/time-context'
+import type { TimeEventInfo } from '@tanstack/time'
+import type { ActivityLogEntry } from '../store/time-context'
+
+export default function Devtools() {
+  return (
+    <TimeProvider>
+      <DevtoolsContent />
+    </TimeProvider>
+  )
+}
+
+const formatTime = (timestamp: number) => {
+  const date = new Date(timestamp)
+  return date.toLocaleTimeString('en-US', {
+    hour12: false,
+    hour: '2-digit',
+    minute: '2-digit',
+    second: '2-digit',
+  })
+}
+
+const getEventTypeLabel = (
+  type: string,
+): {
+  text: string
+  color:
+    | 'green'
+    | 'blue'
+    | 'red'
+    | 'yellow'
+    | 'purple'
+    | 'pink'
+    | 'gray'
+    | 'teal'
+} => {
+  switch (type) {
+    case 'time:events:set':
+      return { text: 'Loaded', color: 'green' }
+    case 'time:event:added':
+      return { text: 'Added', color: 'green' }
+    case 'time:event:updated':
+      return { text: 'Updated', color: 'blue' }
+    case 'time:event:removed':
+      return { text: 'Removed', color: 'red' }
+    case 'time:event:resized':
+      return { text: 'Resized', color: 'yellow' }
+    case 'time:event:update:error':
+      return { text: 'Update Error', color: 'red' }
+    case 'time:calendar:navigate':
+      return { text: 'Navigate', color: 'purple' }
+    case 'time:event:undo':
+      return { text: 'Undo', color: 'yellow' }
+    case 'time:event:redo':
+      return { text: 'Redo', color: 'yellow' }
+    case 'time:calendar:viewMode:changed':
+      return { text: 'View Mode', color: 'pink' }
+    default:
+      return { text: type, color: 'gray' }
+  }
+}
+
+const getEventDescription = (entry: ActivityLogEntry): string => {
+  const { type, details } = entry
+
+  switch (type) {
+    case 'time:events:set':
+      const evts = details.events as Array<unknown> | undefined
+      return `Batched ${evts?.length || 0} events`
+    case 'time:event:added':
+      return `${details.eventTitle || 'Event'} (ID: ${String(details.eventId).slice(0, 8)}...)`
+    case 'time:event:updated':
+      return `${details.eventTitle || 'Event'} - ${Object.keys(details.updates || {}).join(', ')}`
+    case 'time:event:removed':
+      return `${details.eventTitle || 'Event'}`
+    case 'time:event:resized':
+      return `Resized to ${String(details.start)} - ${String(details.end)}`
+    case 'time:event:update:error':
+      return `${details.eventTitle || 'Event'} - ${String(details.message)}`
+    case 'time:event:undo': {
+      const d = details as {
+        added?: Array<TimeEventInfo>
+        removed?: Array<TimeEventInfo>
+        updated?: Array<TimeEventInfo>
+      }
+      const parts: Array<string> = []
+      if (d.added?.length) parts.push(`${d.added.length} added`)
+      if (d.removed?.length) parts.push(`${d.removed.length} removed`)
+      if (d.updated?.length) parts.push(`${d.updated.length} updated`)
+      return parts.length ? `Undo: ${parts.join(', ')}` : 'Undo'
+    }
+    case 'time:event:redo': {
+      const d = details as {
+        added?: Array<TimeEventInfo>
+        removed?: Array<TimeEventInfo>
+        updated?: Array<TimeEventInfo>
+      }
+      const parts: Array<string> = []
+      if (d.added?.length) parts.push(`${d.added.length} added`)
+      if (d.removed?.length) parts.push(`${d.removed.length} removed`)
+      if (d.updated?.length) parts.push(`${d.updated.length} updated`)
+      return parts.length ? `Redo: ${parts.join(', ')}` : 'Redo'
+    }
+    case 'time:calendar:navigate':
+      return `${String(details.direction)} → ${String(details.targetDate)}`
+    case 'time:calendar:viewMode:changed':
+      const viewMode = details.viewMode as
+        | { value?: number; unit?: string }
+        | undefined
+      return `${viewMode?.value || ''} ${viewMode?.unit || ''}`
+    default:
+      return ''
+  }
+}
+
+function DevtoolsContent() {
+  const { state, clearLog } = useTimeStore()
+  const styles = useStyles()
+  const [activeTab, setActiveTab] = createSignal<'log' | 'events'>('log')
+
+  const [selectedId, setSelectedId] = createSignal<string | null>(null)
+  const [search, setSearch] = createSignal('')
+
+  const filteredLog = createMemo(() => {
+    const s = search().toLowerCase()
+    return state.activityLog.filter((entry) => {
+      if (!s) return true
+      return (
+        entry.type.toLowerCase().includes(s) ||
+        getEventDescription(entry).toLowerCase().includes(s)
+      )
+    })
+  })
+
+  const filteredEvents = createMemo(() => {
+    const s = search().toLowerCase()
+    return (Object.values(state.events).filter(Boolean) as Array<any>).filter(
+      (event) => {
+        if (!s) return true
+        return (
+          event.title.toLowerCase().includes(s) ||
+          event.id.toLowerCase().includes(s)
+        )
+      },
+    )
+  })
+
+  const selectedEntry = createMemo(() => {
+    const id = selectedId()
+    if (!id) return null
+    if (activeTab() === 'log') {
+      return state.activityLog.find((e) => e.id === id)
+    }
+    return state.events[id]
+  })
+
+  return (
+    <MainPanel class={styles().shellRoot}>
+      <Header>
+        <HeaderLogo flavor={{ light: '#9dec48', dark: '#9dec48' }}>
+          TanStack Time v0
+        </HeaderLogo>
+        <div
+          style={{
+            display: 'flex',
+            gap: '0.5rem',
+            'margin-left': '1.5rem',
+            flex: 1,
+          }}
+        >
+          <Show
+            when={activeTab() === 'log'}
+            fallback={
+              <Button
+                onClick={() => {
+                  setActiveTab('log')
+                  setSelectedId(null)
+                }}
+                variant="primary"
+                outline
+              >
+                Activity
+              </Button>
+            }
+          >
+            <Button
+              onClick={() => {
+                setActiveTab('log')
+                setSelectedId(null)
+              }}
+              variant="primary"
+            >
+              Activity
+            </Button>
+          </Show>
+          <Show
+            when={activeTab() === 'events'}
+            fallback={
+              <Button
+                onClick={() => {
+                  setActiveTab('events')
+                  setSelectedId(null)
+                }}
+                variant="primary"
+                outline
+              >
+                Events
+              </Button>
+            }
+          >
+            <Button
+              onClick={() => {
+                setActiveTab('events')
+                setSelectedId(null)
+              }}
+              variant="primary"
+            >
+              Events
+            </Button>
+          </Show>
+        </div>
+        <Show when={state.isConnected}>
+          <span class={styles().connectedStatus}>
+            <span class={styles().connectedDot} />
+            Connected
+          </span>
+        </Show>
+      </Header>
+
+      <div class={styles().container}>
+        <div class={styles().sidebar}>
+          <div class={styles().searchArea}>
+            <Input
+              placeholder={`Filter ${activeTab() === 'log' ? 'activity' : 'events'}...`}
+              value={search()}
+              onChange={(val) => setSearch(val)}
+            />
+          </div>
+
+          <div class={styles().list}>
+            <Show when={activeTab() === 'log'}>
+              <div class={styles().sectionHeader}>
+                <span style={{ 'font-size': '11px', color: '#9ca3af' }}>
+                  {filteredLog().length} Entries
+                </span>
+                <Button onClick={clearLog} variant="secondary">
+                  Clear
+                </Button>
+              </div>
+              <For
+                each={filteredLog()}
+                fallback={
+                  <div class={styles().emptyState}>No activity found.</div>
+                }
+              >
+                {(entry) => {
+                  const label = getEventTypeLabel(entry.type)
+                  return (
+                    <div
+                      class={styles().listItem}
+                      classList={{ active: selectedId() === entry.id }}
+                      onClick={() => setSelectedId(entry.id)}
+                    >
+                      <span class={styles().timestamp}>
+                        {formatTime(entry.timestamp)}
+                      </span>
+                      <Tag color={label.color} label={label.text} />
+                      <span class={styles().description}>
+                        {getEventDescription(entry)}
+                      </span>
+                    </div>
+                  )
+                }}
+              </For>
+            </Show>
+
+            <Show when={activeTab() === 'events'}>
+              <div class={styles().sectionHeader}>
+                <span style={{ 'font-size': '11px', color: '#9ca3af' }}>
+                  {filteredEvents().length} Events
+                </span>
+              </div>
+              <For
+                each={filteredEvents()}
+                fallback={
+                  <div class={styles().emptyState}>No events found.</div>
+                }
+              >
+                {(event) => (
+                  <div
+                    class={styles().listItem}
+                    classList={{ active: selectedId() === event.id }}
+                    onClick={() => setSelectedId(event.id)}
+                  >
+                    <div
+                      style={{
+                        display: 'flex',
+                        'flex-direction': 'column',
+                        gap: '2px',
+                      }}
+                    >
+                      <div style={{ 'font-weight': 600 }}>{event.title}</div>
+                      <div style={{ 'font-size': '10px', color: '#9ca3af' }}>
+                        {event.start.split('T')[0]} → {event.end.split('T')[0]}
+                      </div>
+                    </div>
+                  </div>
+                )}
+              </For>
+            </Show>
+          </div>
+        </div>
+
+        {/* Details Panel */}
+        <div class={styles().details}>
+          <Show
+            when={selectedEntry()}
+            fallback={
+              <div class={styles().emptyState}>
+                Select an item to view details
+              </div>
+            }
+          >
+            {(entry) => (
+              <>
+                <div class={styles().detailsHeader}>
+                  <div
+                    style={{
+                      display: 'flex',
+                      'align-items': 'center',
+                      gap: '8px',
+                    }}
+                  >
+                    <Show when={activeTab() === 'log'}>
+                      <Tag
+                        label={
+                          getEventTypeLabel((entry() as ActivityLogEntry).type)
+                            .text
+                        }
+                        color={
+                          getEventTypeLabel((entry() as ActivityLogEntry).type)
+                            .color
+                        }
+                      />
+                    </Show>
+                    <span style={{ 'font-weight': 600 }}>
+                      {activeTab() === 'log'
+                        ? (entry() as ActivityLogEntry).type
+                        : (entry() as any).title}
+                    </span>
+                  </div>
+                  <Button
+                    onClick={() => setSelectedId(null)}
+                    variant="secondary"
+                    style={{ padding: '4px' }}
+                  >
+                    <X />
+                  </Button>
+                </div>
+                <div class={styles().detailsContent}>
+                  <div style={{ 'margin-bottom': '16px' }}>
+                    <div
+                      style={{
+                        'font-size': '11px',
+                        color: '#9ca3af',
+                        'margin-bottom': '4px',
+                      }}
+                    >
+                      Raw Data
+                    </div>
+                    <div class={styles().jsonTreeContainer}>
+                      <JsonTree
+                        value={
+                          activeTab() === 'log'
+                            ? (entry() as ActivityLogEntry).details
+                            : entry()
+                        }
+                        defaultExpansionDepth={1}
+                      />
+                    </div>
+                  </div>
+
+                  <Show when={activeTab() === 'log'}>
+                    <div
+                      style={{
+                        'font-size': '11px',
+                        color: '#9ca3af',
+                        'margin-bottom': '4px',
+                      }}
+                    >
+                      Metadata
+                    </div>
+                    <div class={styles().jsonTreeContainer}>
+                      <JsonTree
+                        value={{
+                          id: (entry() as ActivityLogEntry).id,
+                          timestamp: (entry() as ActivityLogEntry).timestamp,
+                          formattedTime: formatTime(
+                            (entry() as ActivityLogEntry).timestamp,
+                          ),
+                        }}
+                      />
+                    </div>
+                  </Show>
+                </div>
+              </>
+            )}
+          </Show>
+        </div>
+      </div>
+    </MainPanel>
+  )
+}
diff --git a/packages/time-devtools/src/components/ThemedShell.tsx b/packages/time-devtools/src/components/ThemedShell.tsx
new file mode 100644
index 00000000..cd4c31ae
--- /dev/null
+++ b/packages/time-devtools/src/components/ThemedShell.tsx
@@ -0,0 +1,11 @@
+import { ThemeContextProvider } from '@tanstack/devtools-ui'
+import type { TanStackDevtoolsPluginProps } from '@tanstack/devtools'
+import Shell from './Shell'
+
+export default function ThemedShell(props: TanStackDevtoolsPluginProps) {
+  return (
+    <ThemeContextProvider theme={props.theme ?? 'dark'}>
+      <Shell />
+    </ThemeContextProvider>
+  )
+}
diff --git a/packages/time-devtools/src/core.tsx b/packages/time-devtools/src/core.tsx
new file mode 100644
index 00000000..72aa0751
--- /dev/null
+++ b/packages/time-devtools/src/core.tsx
@@ -0,0 +1,9 @@
+import { constructCoreClass } from '@tanstack/devtools-utils/solid'
+
+const [TimeDevtoolsCore, TimeDevtoolsCoreNoOp] = constructCoreClass(
+  () => import('./components/ThemedShell'),
+)
+
+export interface TimeDevtoolsInit {}
+
+export { TimeDevtoolsCore, TimeDevtoolsCoreNoOp }
diff --git a/packages/time-devtools/src/index.ts b/packages/time-devtools/src/index.ts
new file mode 100644
index 00000000..b8527488
--- /dev/null
+++ b/packages/time-devtools/src/index.ts
@@ -0,0 +1,8 @@
+import * as Devtools from './core'
+
+export const TimeDevtoolsCore =
+  process.env.NODE_ENV !== 'development'
+    ? Devtools.TimeDevtoolsCoreNoOp
+    : Devtools.TimeDevtoolsCore
+
+export type { TimeDevtoolsInit } from './core'
diff --git a/packages/time-devtools/src/production.ts b/packages/time-devtools/src/production.ts
new file mode 100644
index 00000000..bdba1cc8
--- /dev/null
+++ b/packages/time-devtools/src/production.ts
@@ -0,0 +1,3 @@
+export { TimeDevtoolsCore } from './core'
+
+export type { TimeDevtoolsInit } from './core'
diff --git a/packages/time-devtools/src/store/time-context.tsx b/packages/time-devtools/src/store/time-context.tsx
new file mode 100644
index 00000000..0d1fd49d
--- /dev/null
+++ b/packages/time-devtools/src/store/time-context.tsx
@@ -0,0 +1,170 @@
+import { createContext, onCleanup, onMount, useContext } from 'solid-js'
+import { createStore } from 'solid-js/store'
+import { getTimeClient } from '@tanstack/time'
+import type { TimeEventMap } from '@tanstack/time'
+import type { ParentComponent } from 'solid-js'
+
+export interface ActivityLogEntry {
+  id: string
+  timestamp: number
+  type: keyof TimeEventMap
+  details: Record<string, unknown>
+}
+
+interface TimeStoreState {
+  activityLog: Array<ActivityLogEntry>
+  isConnected: boolean
+  events: Record<
+    string,
+    { id: string; title: string; start: string; end: string }
+  >
+}
+
+interface TimeContextValue {
+  state: TimeStoreState
+  clearLog: () => void
+}
+
+const TimeContext = createContext<TimeContextValue>()
+
+export function useTimeStore(): TimeContextValue {
+  const context = useContext(TimeContext)
+  if (!context) {
+    throw new Error('useTimeStore must be used within an TimeProvider')
+  }
+  return context
+}
+
+function generateId(): string {
+  return `${Date.now()}-${Math.random().toString(36).substr(2, 9)}`
+}
+
+export const TimeProvider: ParentComponent = (props) => {
+  const [state, setState] = createStore<TimeStoreState>({
+    activityLog: [],
+    isConnected: false,
+    events: {},
+  })
+
+  const clearLog = () => {
+    setState('activityLog', [])
+  }
+
+  onMount(() => {
+    const client = getTimeClient()
+
+    // Mark as connected
+    setState('isConnected', true)
+
+    // Subscribe to all time events using onAllPluginEvents
+    const unsubscribe = client.onAllPluginEvents((event) => {
+      const entry: ActivityLogEntry = {
+        id: generateId(),
+        timestamp: Date.now(),
+        type: event.type,
+        details: event.payload as unknown as Record<string, unknown>,
+      }
+
+      setState('activityLog', (prev) => [entry, ...prev].slice(0, 100))
+
+      // Track the live map of events
+      if (
+        event.type === 'time:event:added' ||
+        event.type === 'time:event:updated'
+      ) {
+        const payload = event.payload as {
+          eventId: string
+          eventTitle: string
+          start: string
+          end: string
+        }
+        setState('events', payload.eventId, {
+          id: payload.eventId,
+          title: payload.eventTitle,
+          start: payload.start,
+          end: payload.end,
+        })
+      } else if (event.type === 'time:event:removed') {
+        const payload = event.payload as { eventId: string }
+        setState('events', payload.eventId, undefined!)
+      } else if (
+        event.type === 'time:event:undo' ||
+        event.type === 'time:event:redo'
+      ) {
+        const payload = event.payload as {
+          added: Array<{
+            eventId: string
+            eventTitle: string
+            start: string
+            end: string
+          }>
+          removed: Array<{
+            eventId: string
+            eventTitle: string
+            start: string
+            end: string
+          }>
+          updated: Array<{
+            eventId: string
+            eventTitle: string
+            start: string
+            end: string
+          }>
+        }
+        setState('events', (prev) => {
+          const next = { ...prev }
+          for (const ev of payload.removed) {
+            delete next[ev.eventId]
+          }
+          for (const ev of [...payload.added, ...payload.updated]) {
+            next[ev.eventId] = {
+              id: ev.eventId,
+              title: ev.eventTitle,
+              start: ev.start,
+              end: ev.end,
+            }
+          }
+          return next
+        })
+      } else if (event.type === 'time:events:set') {
+        const payload = event.payload as {
+          events: Array<{
+            eventId: string
+            eventTitle: string
+            start: string
+            end: string
+          }>
+        }
+        setState('events', (prev) => {
+          const next = { ...prev }
+          for (const ev of payload.events) {
+            next[ev.eventId] = {
+              id: ev.eventId,
+              title: ev.eventTitle,
+              start: ev.start,
+              end: ev.end,
+            }
+          }
+          return next
+        })
+      }
+    })
+
+    onCleanup(() => {
+      unsubscribe()
+      setState('isConnected', false)
+      setState('events', {})
+    })
+  })
+
+  const contextValue: TimeContextValue = {
+    state,
+    clearLog,
+  }
+
+  return (
+    <TimeContext.Provider value={contextValue}>
+      {props.children}
+    </TimeContext.Provider>
+  )
+}
diff --git a/packages/time-devtools/src/styles/use-styles.ts b/packages/time-devtools/src/styles/use-styles.ts
new file mode 100644
index 00000000..6fe6a137
--- /dev/null
+++ b/packages/time-devtools/src/styles/use-styles.ts
@@ -0,0 +1,154 @@
+import * as goober from 'goober'
+import { createEffect, createSignal } from 'solid-js'
+
+const stylesFactory = () => {
+  const css = goober.css
+
+  return {
+    connectedStatus: css`
+      font-size: 12px;
+      color: #22c55e;
+      display: flex;
+      align-items: center;
+      gap: 6px;
+    `,
+
+    connectedDot: css`
+      width: 8px;
+      height: 8px;
+      border-radius: 50%;
+      background-color: #22c55e;
+    `,
+
+    sectionHeader: css`
+      display: flex;
+      justify-content: space-between;
+      align-items: center;
+      padding: 8px 12px;
+      border-bottom: 1px solid #374151;
+      background-color: #111827;
+    `,
+
+    emptyState: css`
+      text-align: center;
+      color: #6b7280;
+      padding: 20px;
+      font-size: 13px;
+    `,
+
+    container: css`
+      display: flex;
+      flex-direction: row;
+      height: 100%;
+      overflow: hidden;
+      flex: 1;
+      background-color: #0b0f1a;
+    `,
+
+    shellRoot: css`
+      height: var(--tsd-main-panel-height) !important;
+      overflow-y: hidden !important;
+    `,
+
+    sidebar: css`
+      display: flex;
+      flex-direction: column;
+      width: 320px;
+      min-width: 250px;
+      border-right: 1px solid #1f2937;
+      height: 100%;
+      background-color: #111827;
+    `,
+
+    details: css`
+      flex: 1;
+      display: flex;
+      flex-direction: column;
+      height: 100%;
+      min-height: 0;
+      overflow-y: auto;
+      background-color: #0b0f1a;
+    `,
+
+    searchArea: css`
+      padding: 8px;
+      border-bottom: 1px solid #1f2937;
+      background-color: #111827;
+    `,
+
+    list: css`
+      flex: 1;
+      overflow-y: auto;
+      display: flex;
+      flex-direction: column;
+    `,
+
+    listItem: css`
+      display: flex;
+      align-items: center;
+      gap: 8px;
+      padding: 8px 12px;
+      border-bottom: 1px solid #1f2937;
+      cursor: pointer;
+      font-size: 12px;
+      transition: background-color 0.2s;
+      user-select: none;
+
+      &:hover {
+        background-color: #1f2937;
+      }
+
+      &.active {
+        background-color: #374151;
+        border-left: 3px solid #9dec48;
+      }
+    `,
+
+    timestamp: css`
+      font-family: monospace;
+      color: #9ca3af;
+      font-size: 10px;
+      white-space: nowrap;
+    `,
+
+    description: css`
+      color: #e5e7eb;
+      flex-grow: 1;
+      overflow: hidden;
+      text-overflow: ellipsis;
+      white-space: nowrap;
+    `,
+
+    detailsHeader: css`
+      display: flex;
+      align-items: center;
+      justify-content: space-between;
+      padding: 12px;
+      border-bottom: 1px solid #1f2937;
+      background-color: #111827;
+    `,
+
+    detailsContent: css`
+      flex: 1;
+      overflow-y: auto;
+      padding: 12px;
+      font-size: 12px;
+    `,
+
+    jsonTreeContainer: css`
+      background-color: #111827;
+      padding: 12px;
+      border-radius: 8px;
+      margin-top: 12px;
+      border: 1px solid #1f2937;
+    `,
+  }
+}
+
+export function useStyles() {
+  const [styles, setStyles] = createSignal(stylesFactory())
+  createEffect(() => {
+    setStyles(stylesFactory())
+  })
+  return styles
+}
diff --git a/packages/time-devtools/tsconfig.json b/packages/time-devtools/tsconfig.json
new file mode 100644
index 00000000..91883231
--- /dev/null
+++ b/packages/time-devtools/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["src", "vite.config.ts", "tests"],
+  "exclude": ["eslint.config.js"],
+  "compilerOptions": {
+    "jsx": "preserve",
+    "jsxImportSource": "solid-js"
+  }
+}
diff --git a/packages/time-devtools/tsdown.config.ts b/packages/time-devtools/tsdown.config.ts
new file mode 100644
index 00000000..a72a8faa
--- /dev/null
+++ b/packages/time-devtools/tsdown.config.ts
@@ -0,0 +1,18 @@
+import { defineConfig } from 'tsdown'
+import solid from 'rolldown-plugin-solid'
+
+export default defineConfig({
+  entry: ['./src/index.ts'],
+  format: ['esm', 'cjs'],
+  unbundle: true,
+  dts: true,
+  sourcemap: true,
+  clean: true,
+  minify: false,
+  fixedExtension: false,
+  exports: true,
+  publint: {
+    strict: true,
+  },
+  plugins: [solid()],
+})
diff --git a/packages/time-devtools/vitest.config.ts b/packages/time-devtools/vitest.config.ts
new file mode 100644
index 00000000..72ad1d46
--- /dev/null
+++ b/packages/time-devtools/vitest.config.ts
@@ -0,0 +1,12 @@
+import { defineConfig } from 'vitest/config'
+import packageJson from './package.json' with { type: 'json' }
+
+export default defineConfig({
+  test: {
+    name: packageJson.name,
+    dir: './',
+    watch: false,
+    environment: 'happy-dom',
+    globals: true,
+  },
+})
diff --git a/packages/time/README.md b/packages/time/README.md
new file mode 100644
index 00000000..7ecd7e46
--- /dev/null
+++ b/packages/time/README.md
@@ -0,0 +1,3 @@
+# time
+
+🤖⏰ Headless utilities for building time and calendar components in TS/JS, React, Solid, Vue, Svelte and Angular
diff --git a/packages/time/eslint.config.js b/packages/time/eslint.config.js
new file mode 100644
index 00000000..c61c24df
--- /dev/null
+++ b/packages/time/eslint.config.js
@@ -0,0 +1,11 @@
+// @ts-check
+
+import rootConfig from '../../eslint.config.js'
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+  ...rootConfig,
+  {
+    rules: {},
+  },
+]
diff --git a/packages/time/package.json b/packages/time/package.json
new file mode 100644
index 00000000..5498b73e
--- /dev/null
+++ b/packages/time/package.json
@@ -0,0 +1,56 @@
+{
+  "name": "@tanstack/time",
+  "version": "0.0.0",
+  "description": "Headless utilities for building time and calendar components in TS/JS, React, Solid, Vue, Svelte and Angular",
+  "author": "Tanner Linsley",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/TanStack/time.git",
+    "directory": "packages/time"
+  },
+  "homepage": "https://tanstack.com/time",
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/tannerlinsley"
+  },
+  "keywords": [
+    "tanstack",
+    "time"
+  ],
+  "scripts": {
+    "clean": "premove ./build ./dist",
+    "lint:fix": "eslint ./src --fix",
+    "test:eslint": "eslint ./src",
+    "test:lib": "vitest --passWithNoTests",
+    "test:lib:dev": "pnpm test:lib --watch",
+    "test:types": "tsc",
+    "build": "tsdown"
+  },
+  "type": "module",
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.cts",
+  "exports": {
+    ".": {
+      "require": "./dist/index.cjs",
+      "import": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "sideEffects": false,
+  "engines": {
+    "node": ">=18"
+  },
+  "files": [
+    "dist/",
+    "src"
+  ],
+  "dependencies": {
+    "@tanstack/devtools-event-client": "^0.4.0",
+    "@tanstack/store": "^0.8.0"
+  },
+  "devDependencies": {
+    "vite-tsconfig-paths": "^6.1.1"
+  }
+}
diff --git a/packages/time/src/calendar/calendar.ts b/packages/time/src/calendar/calendar.ts
new file mode 100644
index 00000000..9552aa18
--- /dev/null
+++ b/packages/time/src/calendar/calendar.ts
@@ -0,0 +1,3869 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { getTimeClient } from '../client'
+import { splitMultiDayEvents } from './splitMultiDayEvents'
+import { expandRecurringEvent } from './expandRecurringEvent'
+import { getEventProps } from './getEventProps'
+import { groupDaysBy } from './groupDaysBy'
+import { getTimeSlots } from './getTimeSlots'
+import { calculateResizedEvent, getSegmentInfo } from './getResizeProps'
+import { DateCore } from './date-core'
+import { generateDateRange } from './generateDateRange'
+import { ResizeController } from './resizeController'
+import type { DateCoreOptions, ParsedDateCoreOptions } from './date-core'
+import type { ResizeControllerOptions } from './resizeController'
+import type {
+  ResizeConstraints,
+  ResizeEdge,
+  SegmentInfo,
+  UnavailableTimeRange,
+} from './getResizeProps'
+import type {
+  AvailabilityConflict,
+  Day,
+  DependencyType,
+  Event,
+  EventDateTimeInput,
+  EventDependency,
+  RecurrenceEditScope,
+  ResizeError,
+  Resource,
+  SaveEventResult,
+  TimeSlot,
+  TimelineLayout,
+  TimelineResourceRow,
+  UnavailableRange,
+  ViewMode,
+} from './types'
+import { toPlainDateString, toPlainDateTimeString } from '~/date/parse'
+
+export type * from './types'
+export * from './date-core'
+
+interface CalendarStore {
+  currentPeriod: Temporal.PlainDate
+  activeDate: Temporal.PlainDate
+  viewMode: ViewMode
+}
+
+/**
+ * Configuration options for initializing a CalendarCore instance, allowing customization
+ * of events, locale, time zone, and the calendar system.
+ * @template TEvent - Specifies the event type, extending a base Event type.
+ */
+export interface CalendarCoreOptions<
+  TResource extends Resource,
+  TEvent extends Event<TResource>,
+> extends DateCoreOptions {
+  /** An optional array of events to be handled by the calendar. */
+  events?: Array<TEvent> | null
+  /** Optional resources to be used in the calendar. */
+  resources?: Array<TResource> | null
+  /**
+   * Optional async callback for lazy/on-demand event loading.
+   * Called whenever the current viewport window is not yet fully loaded.
+   * The returned events are merged into the internal indices automatically.
+   * When omitted the calendar operates in fully-eager mode (no change in behaviour).
+   */
+  fetchEvents?: (range: {
+    start: string
+    end: string
+  }) => Promise<Array<TEvent>>
+}
+
+/**
+ * The API surface provided by CalendarCore, allowing interaction with the calendar's state
+ * and manipulation of its settings and data.
+ * @template TEvent - The type of events handled by the calendar.
+ */
+interface CalendarActions<
+  TResource extends Resource,
+  TEvent extends Event<TResource>,
+> {
+  /** Navigates to the previous period according to the current view mode. */
+  goToPreviousPeriod: () => void
+  /** Navigates to the next period according to the current view mode. */
+  goToNextPeriod: () => void
+  /** Resets the view to the current period based on today's date. */
+  goToCurrentPeriod: () => void
+  /** Navigates to a specific date. */
+  goToSpecificPeriod: (date: string) => void
+  /** Checks if navigation to the previous period is allowed within the range. */
+  canGoPreviousPeriod: () => boolean
+  /** Checks if navigation to the next period is allowed within the range. */
+  canGoNextPeriod: () => boolean
+  /**
+   * Navigates to the next occurrence of a recurring event after fromDate (defaults to activeDate).
+   * No-op when the event is not recurring or has no future occurrences.
+   */
+  goToNextOccurrence: (eventId: string, fromDate?: EventDateTimeInput) => void
+  /**
+   * Navigates to the previous occurrence of a recurring event before fromDate (defaults to activeDate).
+   * No-op when the event is not recurring or is already at the first occurrence.
+   */
+  goToPreviousOccurrence: (
+    eventId: string,
+    fromDate?: EventDateTimeInput,
+  ) => void
+  /**
+   * Returns the master event for a given occurrence (or the event itself if it is already the master).
+   */
+  getMasterEvent: (event: TEvent) => TEvent
+  /** Changes the current view mode of the calendar. */
+  changeViewMode: (newViewMode: CalendarStore['viewMode']) => void
+  /** Retrieves styling properties for a specific event. */
+  getEventProps: (event: TEvent) => {
+    isSplitEvent: boolean
+    overlappingEvents: Array<TEvent>
+    start: string
+    end: string
+    style?: {
+      top: string
+      height: string
+      left: string
+      width: string
+    }
+  }
+  /** Retrieves the names of the days of the week, based on the current locale. */
+  getDaysNames: (weekday?: 'long' | 'short') => Array<string>
+  /** Groups days by a specified unit. */
+  groupDaysBy: (props: {
+    days: Array<Day<TResource, TEvent> | null>
+    unit: 'week' | 'workWeek'
+    fillMissingDays?: boolean
+  }) => Array<Array<Day<TResource, TEvent> | null>>
+  /** Retrieves time slots for day view with configurable intervals. */
+  getTimeSlots: (
+    options?: Parameters<typeof getTimeSlots>[1],
+  ) => Array<TimeSlot>
+  /** Retrieves all events for a specific date. */
+  getEventsByDate: (date: string) => Array<TEvent>
+  /** Retrieves all-day events occurring on a specific date (multi-day all-day segments included). */
+  getAllDayEventsByDate: (date: string) => Array<TEvent>
+  /**
+   * Fetches events for the event's date range, validates placement
+   * constraints, and adds the event if valid. Returns a result
+   * indicating success or a validation error.
+   */
+  addEvent: (
+    event: TEvent,
+    options?: { dependsOn?: Array<EventDependency> },
+  ) => Promise<SaveEventResult>
+  /**
+   * Fetches events for the event's date range, validates move constraints
+   * (and cascading dependents), and updates the event if valid.
+   * Returns a result indicating success or a validation error.
+   */
+  editEvent: (
+    eventId: string,
+    updates: Partial<Omit<TEvent, 'id'>>,
+    options?: { dependsOn?: Array<EventDependency> },
+  ) => Promise<SaveEventResult>
+  /** Edits one occurrence, this-and-following occurrences, or the whole recurring series. */
+  editRecurringEvent: (
+    eventId: string,
+    updates: Partial<Omit<TEvent, 'id'>>,
+    options: {
+      scope: RecurrenceEditScope
+      occurrenceStart?: EventDateTimeInput
+      dependsOn?: Array<EventDependency>
+    },
+  ) => Promise<SaveEventResult>
+  /** Removes one occurrence, this-and-following occurrences, or the whole recurring series. */
+  removeRecurringEvent: (
+    eventId: string,
+    options: {
+      scope: RecurrenceEditScope
+      occurrenceStart?: EventDateTimeInput
+    },
+  ) => void
+  /** Removes an event by ID. */
+  removeEvent: (id: Event['id']) => void
+  /** Retrieves unavailable time ranges for a specific date based on resource availability. */
+  getUnavailableRanges: (
+    date: string,
+    options?: {
+      containerHeight?: number
+      resourceIds?: Array<TResource['id']>
+    },
+  ) => Array<UnavailableRange>
+  /** Groups visible events by resource, merging multi-day segments back to full-span events. */
+  getEventsByResource: () => Map<TResource['id'], Array<TEvent>>
+  /** Computes horizontal timeline layout with event positions, lane assignments, and current time marker. */
+  getTimelineLayout: () => TimelineLayout<TResource, TEvent>
+  /** Returns a human-readable label for the currently visible date range. */
+  formatPeriodLabel: (options?: { locale?: string }) => string
+  /** Formats the current period as a human-readable "Month Year" string (e.g. "January 2024"). */
+  formatCurrentPeriod: (options?: { locale?: string }) => string
+  /** Returns segment info (split/occurrence metadata) for an event, normalising flexible datetime inputs. */
+  getEventSegmentInfo: (event: TEvent) => SegmentInfo
+  /**
+   * Returns Day objects for every date between `start` and `end` (inclusive),
+   * derived freshly from current event state. Useful for buffered/infinite-scroll
+   * UIs that need to render a range wider than the current period without
+   * caching stale Day snapshots.
+   */
+  getDaysInRange: (start: string, end: string) => Array<Day<TResource, TEvent>>
+  /** Returns a snapshot of all events currently managed by the calendar (including those outside the visible range). */
+  getEvents: () => Array<TEvent>
+  /** Reverts the last mutating action (commitAdd, commitUpdate, removeEvent). */
+  undo: () => void
+  /** Re-applies the last undone action. */
+  redo: () => void
+  /** Returns true when there is at least one action to undo. */
+  canUndo: () => boolean
+  /** Returns true when there is at least one action to redo. */
+  canRedo: () => boolean
+  /**
+   * Checks whether moving `eventId` to `[newStart, newEnd]` — and cascading
+   * all finish-to-start dependents — would violate any resource availability.
+   */
+  validateMove: (
+    eventId: string,
+    newStart: string,
+    newEnd: string,
+    newResources?: Array<TResource | string>,
+    newConsumption?: Array<number>,
+  ) => { blocked: boolean; blockedEventTitle?: string; message?: string }
+  /**
+   * Validates if placing an event with a specific start time satisfies all dependency constraints.
+   */
+  validateEventDependencies: (
+    event: { id?: string; title: string; start: string; end: string },
+    dependsOn: Array<EventDependency>,
+  ) => { valid: boolean; error?: ResizeError }
+  /**
+   * Creates a dependency link from source to target event.
+   * If the target event starts before the source event ends, it will optionally reschedule the target.
+   */
+  createDependency: (
+    sourceId: string,
+    targetId: string,
+    type?: DependencyType,
+  ) => { blocked: boolean; error?: ResizeError }
+  /**
+   * Fetches events for an arbitrary date range from the configured
+   * `fetchEvents` callback and merges them into the calendar.
+   * Resolves immediately if `fetchEvents` is not configured or the range
+   * is already loaded.
+   */
+  fetchEventsForRange: (start: string, end: string) => Promise<void>
+  /**
+   * Validates whether a new event (not yet added to the calendar) can be
+   * placed at the given time slot without violating resource availability.
+   * Use this for standalone validation before manually committing events.
+   */
+  validateEventPlacement: (event: {
+    title: string
+    start: string
+    end: string
+    resources?: Array<TResource | string>
+  }) => { blocked: boolean; message?: string }
+  setResources: (resources: Array<TResource> | null) => void
+  setEvents: (events: Array<TEvent> | null) => void
+}
+
+interface CalendarState<
+  TResource extends Resource,
+  TEvent extends Event<TResource>,
+> {
+  /** The currently focused date period in the calendar. */
+  currentPeriod: CalendarStore['currentPeriod']
+  /** The current view mode of the calendar. */
+  viewMode: CalendarStore['viewMode']
+  /** An array of days, each potentially containing events. */
+  days: Array<Day<TResource, TEvent>>
+  /** The currently active date in the calendar. */
+  activeDate: CalendarStore['activeDate']
+}
+
+type ConvertTemporalToString<T> = {
+  [K in keyof T]: T[K] extends Temporal.PlainDate ? string : T[K]
+}
+
+export interface CalendarApi<
+  TResource extends Resource,
+  TEvent extends Event<TResource>,
+>
+  extends
+    CalendarActions<TResource, TEvent>,
+    ConvertTemporalToString<CalendarState<TResource, TEvent>> {}
+
+export interface ValidateResizeOptions {
+  eventId: string
+  originalStart: string
+  originalEnd: string
+  edge: ResizeEdge
+  totalDeltaMinutes: number
+  targetDayDate: string
+  originalDayDate: string
+  occurrenceStart?: EventDateTimeInput
+  constraints?: ResizeConstraints
+}
+
+export interface ValidateResizeResult {
+  blocked: boolean
+  error?: {
+    reason: ResizeError['reason']
+    message: string
+    conflicts: Array<AvailabilityConflict>
+  }
+  result: {
+    start: string
+    end: string
+    durationMinutes: number
+  }
+  targetDayDate: string
+}
+
+const MINUTES_IN_DAY = 24 * 60
+
+const formatMinutesToTime = (minutes: number): string => {
+  const hours = Math.floor(minutes / 60)
+  const mins = minutes % 60
+  return `${String(hours).padStart(2, '0')}:${String(mins).padStart(2, '0')}`
+}
+
+type ParsedCalendarCoreOptions<
+  TResource extends Resource,
+  TEvent extends Event<TResource>,
+> = ParsedDateCoreOptions & {
+  events: Array<TEvent> | null
+  resources: Array<TResource> | null
+  fetchEvents?: (range: {
+    start: string
+    end: string
+  }) => Promise<Array<TEvent>>
+}
+
+export class CalendarCore<
+  TResource extends Resource,
+  TEvent extends Event<TResource>,
+>
+  extends DateCore
+  implements CalendarActions<TResource, TEvent>
+{
+  declare options: ParsedCalendarCoreOptions<TResource, TEvent>
+
+  private _eventMap = new Map<string, TEvent>()
+  private _dependentsMap = new Map<string, Set<string>>()
+  private _dateIndex = new Map<string, Set<string>>()
+  private _loadedRanges: Array<{ start: string; end: string }> = []
+  private _undoStack: Array<Array<TEvent>> = []
+  private _redoStack: Array<Array<TEvent>> = []
+
+  private _resourceDayAvailCache = new Map<
+    string,
+    {
+      available: Array<{ startMinutes: number; endMinutes: number }>
+      unavailable: Array<{ startMinutes: number; endMinutes: number }>
+      hasAvailability: boolean
+      slotsForWeekday: Array<{ startMinutes: number; endMinutes: number }>
+    }
+  >()
+  private _mergedUnavailMinuteCache = new Map<
+    string,
+    Array<{ startMinutes: number; endMinutes: number }>
+  >()
+  private _weekdayCache = new Map<string, number>()
+
+  /**
+   * Monotonic counter bumped whenever event state or resource availability
+   * changes in a way that affects {@link getEventMap}. Drives memoization of
+   * the built event map so repeated calls within (and across) renders don't
+   * re-iterate and re-parse every event.
+   */
+  private _mapVersion = 0
+  private _eventMapCache = new Map<string, Map<string, Array<TEvent>>>()
+  private _eventMapCacheVersion = -1
+
+  private _bumpMapVersion() {
+    this._mapVersion++
+  }
+
+  private _resolveEventResources(event: {
+    resources?: Array<TResource | string>
+  }): Array<TResource> {
+    return (event.resources ?? []).map((r) => {
+      if (typeof r === 'string') {
+        return (
+          this.options.resources?.find((res) => res.id === r) ??
+          ({ id: r, label: r } as TResource)
+        )
+      }
+      return r
+    })
+  }
+
+  private _getEventResourceIds(event: {
+    resources?: Array<TResource | string>
+  }): Array<string> {
+    return (event.resources ?? []).map((r) =>
+      typeof r === 'string' ? r : r.id,
+    )
+  }
+
+  constructor(options: CalendarCoreOptions<TResource, TEvent>) {
+    super(options)
+    Object.assign(this.options, {
+      events: options.events?.map((e) => this.normalizeEvent(e)) || null,
+      resources: options.resources || null,
+      fetchEvents: options.fetchEvents,
+    })
+    this.options.events?.forEach((e) => this._indexAddEvent(e))
+  }
+
+  private _eventDateKey(event: TEvent): string {
+    const startStr = event.start as string
+    return startStr.split('T')[0] ?? startStr
+  }
+
+  private _indexAddEvent(event: TEvent) {
+    this._bumpMapVersion()
+    this._eventMap.set(event.id, event)
+    const dk = this._eventDateKey(event)
+    if (!this._dateIndex.has(dk)) this._dateIndex.set(dk, new Set())
+    this._dateIndex.get(dk)!.add(event.id)
+
+    for (const dep of event.dependsOn ?? []) {
+      if (!this._dependentsMap.has(dep.id))
+        this._dependentsMap.set(dep.id, new Set())
+      this._dependentsMap.get(dep.id)!.add(event.id)
+    }
+  }
+
+  private _indexRemoveEvent(event: TEvent) {
+    this._bumpMapVersion()
+    this._eventMap.delete(event.id)
+    const dk = this._eventDateKey(event)
+    const bucket = this._dateIndex.get(dk)
+    if (bucket) {
+      bucket.delete(event.id)
+      if (bucket.size === 0) this._dateIndex.delete(dk)
+    }
+    for (const dep of event.dependsOn ?? []) {
+      this._dependentsMap.get(dep.id)?.delete(event.id)
+    }
+    this._dependentsMap.delete(event.id)
+  }
+
+  private _indexUpdateEvent(prev: TEvent, next: TEvent) {
+    this._bumpMapVersion()
+    this._eventMap.set(next.id, next)
+
+    const prevDk = this._eventDateKey(prev)
+    const nextDk = this._eventDateKey(next)
+    if (prevDk !== nextDk) {
+      const old = this._dateIndex.get(prevDk)
+      if (old) {
+        old.delete(prev.id)
+        if (old.size === 0) this._dateIndex.delete(prevDk)
+      }
+      if (!this._dateIndex.has(nextDk)) this._dateIndex.set(nextDk, new Set())
+      this._dateIndex.get(nextDk)!.add(next.id)
+    }
+
+    const prevDeps = new Map((prev.dependsOn ?? []).map((d) => [d.id, d.type]))
+    const nextDeps = new Map((next.dependsOn ?? []).map((d) => [d.id, d.type]))
+    for (const [predId] of prevDeps) {
+      if (!nextDeps.has(predId)) {
+        this._dependentsMap.get(predId)?.delete(next.id)
+      }
+    }
+    for (const [predId] of nextDeps) {
+      if (!prevDeps.has(predId)) {
+        if (!this._dependentsMap.has(predId))
+          this._dependentsMap.set(predId, new Set())
+        this._dependentsMap.get(predId)!.add(next.id)
+      }
+    }
+  }
+
+  private _isRangeLoaded(start: string, end: string) {
+    for (const r of this._loadedRanges) {
+      if (r.start <= start && r.end >= end) return true
+    }
+    return false
+  }
+
+  private _markRangeLoaded(start: string, end: string) {
+    this._loadedRanges.push({ start, end })
+    this._loadedRanges.sort((a, b) => (a.start < b.start ? -1 : 1))
+    const merged: Array<{ start: string; end: string }> = []
+
+    for (const r of this._loadedRanges) {
+      const last = merged[merged.length - 1]
+      if (last && r.start <= last.end) {
+        last.end = last.end > r.end ? last.end : r.end
+      } else {
+        merged.push({ ...r })
+      }
+    }
+    this._loadedRanges = merged
+  }
+
+  private _getWeekday(date: string): number {
+    const cached = this._weekdayCache.get(date)
+    if (cached !== undefined) return cached
+    const y = +date.slice(0, 4)
+    const m = +date.slice(5, 7)
+    const d = +date.slice(8, 10)
+    const jsDow = new Date(Date.UTC(y, m - 1, d)).getUTCDay()
+    const iso = jsDow === 0 ? 7 : jsDow
+    this._weekdayCache.set(date, iso)
+    return iso
+  }
+
+  private _parseHmToMinutes(hm: string): number {
+    const h = (hm.charCodeAt(0) - 48) * 10 + (hm.charCodeAt(1) - 48)
+    const mi = (hm.charCodeAt(3) - 48) * 10 + (hm.charCodeAt(4) - 48)
+    return h * 60 + mi
+  }
+
+  private _getResourceDayAvail(
+    resource: TResource,
+    weekday: number,
+  ): {
+    available: Array<{ startMinutes: number; endMinutes: number }>
+    unavailable: Array<{ startMinutes: number; endMinutes: number }>
+    hasAvailability: boolean
+    slotsForWeekday: Array<{ startMinutes: number; endMinutes: number }>
+  } {
+    const key = `${resource.id}:${weekday}`
+    const cached = this._resourceDayAvailCache.get(key)
+    if (cached) return cached
+
+    const slotsForWeekday: Array<{ startMinutes: number; endMinutes: number }> =
+      []
+    if (resource.availability) {
+      for (const slot of resource.availability) {
+        if (!slot.weekdays.includes(weekday)) continue
+        slotsForWeekday.push({
+          startMinutes: this._parseHmToMinutes(slot.startTime),
+          endMinutes: this._parseHmToMinutes(slot.endTime),
+        })
+      }
+    }
+
+    slotsForWeekday.sort((a, b) => a.startMinutes - b.startMinutes)
+    const available: Array<{ startMinutes: number; endMinutes: number }> = []
+    for (const r of slotsForWeekday) {
+      const last = available[available.length - 1]
+      if (last && r.startMinutes <= last.endMinutes) {
+        last.endMinutes = Math.max(last.endMinutes, r.endMinutes)
+      } else {
+        available.push({ ...r })
+      }
+    }
+
+    const unavailable: Array<{ startMinutes: number; endMinutes: number }> = []
+    let cursor = 0
+    for (const a of available) {
+      if (cursor < a.startMinutes) {
+        unavailable.push({ startMinutes: cursor, endMinutes: a.startMinutes })
+      }
+      cursor = a.endMinutes
+    }
+    if (cursor < MINUTES_IN_DAY) {
+      unavailable.push({ startMinutes: cursor, endMinutes: MINUTES_IN_DAY })
+    }
+
+    const result = {
+      available,
+      unavailable,
+      hasAvailability: !!resource.availability,
+      slotsForWeekday,
+    }
+    this._resourceDayAvailCache.set(key, result)
+    return result
+  }
+
+  private normalizeEvent<
+    T extends { start: string | Date | number; end: string | Date | number },
+  >(event: T): T {
+    const recurrence = (event as { recurrence?: TEvent['recurrence'] })
+      .recurrence
+    return {
+      ...event,
+      start: toPlainDateTimeString(event.start),
+      end: toPlainDateTimeString(event.end),
+      ...(recurrence
+        ? { recurrence: this._normalizeRecurrenceDateTimeInputs(recurrence) }
+        : {}),
+    } as T
+  }
+
+  protected getCalendarDays() {
+    return super.getCalendarDays()
+  }
+
+  private getEventMap(window?: { start: string; end: string }) {
+    let windowStart: string | null
+    let windowEnd: string | null
+    if (window) {
+      windowStart = window.start
+      windowEnd = window.end
+    } else {
+      const calendarDays = this.getCalendarDays()
+      windowStart =
+        calendarDays.length > 0
+          ? calendarDays[0]!.toString({ calendarName: 'never' })
+          : null
+      windowEnd =
+        calendarDays.length > 0
+          ? calendarDays[calendarDays.length - 1]!.add({ days: 1 }).toString({
+              calendarName: 'never',
+            })
+          : null
+    }
+
+    // Memoize per window range, invalidated by _mapVersion. The window only
+    // controls recurring-event expansion (non-recurring events are placed
+    // regardless of window), so the key is the resolved range. Without this,
+    // a single render calling getEventsByDate per day re-iterates and
+    // re-parses every event D times.
+    if (this._eventMapCacheVersion !== this._mapVersion) {
+      this._eventMapCache.clear()
+      this._eventMapCacheVersion = this._mapVersion
+    }
+    const cacheKey = `${windowStart ?? ''}|${windowEnd ?? ''}`
+    const cached = this._eventMapCache.get(cacheKey)
+    if (cached) return cached
+
+    const map = new Map<string, Array<TEvent>>()
+
+    const placeEvent = (ev: TEvent) => {
+      const startStr = ev.start as string
+      const endStr = ev.end as string
+
+      const startDt = Temporal.PlainDateTime.from(startStr)
+      const endDt = Temporal.PlainDateTime.from(endStr)
+      const startPlainDate = startDt.toPlainDate()
+      const endPlainDate = endDt.toPlainDate()
+
+      if (Temporal.PlainDate.compare(startPlainDate, endPlainDate) !== 0) {
+        const splitEvents = splitMultiDayEvents<TResource, TEvent>(
+          ev,
+          this.options.timeZone,
+        )
+        splitEvents.forEach((splitEvent) => {
+          const dateKey = Temporal.PlainDateTime.from(
+            toPlainDateTimeString(splitEvent.start),
+          )
+            .toPlainDate()
+            .toString({ calendarName: 'never' })
+          if (!map.has(dateKey)) map.set(dateKey, [])
+          map.get(dateKey)!.push(splitEvent)
+        })
+      } else {
+        const dateKey = startPlainDate.toString({ calendarName: 'never' })
+        if (!map.has(dateKey)) map.set(dateKey, [])
+        map.get(dateKey)!.push(ev)
+      }
+    }
+
+    for (const event of this._eventMap.values()) {
+      if (event.recurrence && windowStart && windowEnd) {
+        const occurrences = expandRecurringEvent<TResource, TEvent>(
+          event,
+          windowStart,
+          windowEnd,
+        )
+        for (const occ of occurrences) {
+          const conflict = occ.resources?.length
+            ? this.checkEventAvailability(
+                occ,
+                occ.start as string,
+                occ.end as string,
+              )
+            : null
+          if (!conflict) {
+            placeEvent(occ)
+          }
+        }
+        continue
+      }
+
+      const masterConflict =
+        event.recurrence && event.resources?.length
+          ? this.checkEventAvailability(
+              event,
+              event.start as string,
+              event.end as string,
+            )
+          : null
+      if (!masterConflict) {
+        placeEvent(event)
+      }
+    }
+
+    this._eventMapCache.set(cacheKey, map)
+    return map
+  }
+
+  ensureRangeLoaded() {
+    const calendarDays = this.getCalendarDays()
+
+    if (this.options.fetchEvents && calendarDays.length > 0) {
+      const first = calendarDays[0]!
+      const last = calendarDays[calendarDays.length - 1]!
+      const rangeStart = first.toString({ calendarName: 'never' })
+
+      const rangeEnd = last.add({ days: 1 }).toString({ calendarName: 'never' })
+
+      if (!this._isRangeLoaded(rangeStart, rangeEnd)) {
+        this._markRangeLoaded(rangeStart, rangeEnd)
+        this.store.setState((prev) => ({ ...prev, isPending: true }))
+        this.options
+          .fetchEvents({ start: rangeStart, end: rangeEnd })
+          .then((fetchedEvents) => {
+            if (fetchedEvents.length > 0) {
+              if (!this.options.events) this.options.events = []
+              const newlyFetchedEvents: Array<{
+                eventId: string
+                eventTitle: string
+                start: string
+                end: string
+              }> = []
+              for (const raw of fetchedEvents) {
+                if (this._eventMap.has(raw.id)) continue
+                const normalized = this.normalizeEvent(raw)
+                this.options.events.push(normalized)
+                this._indexAddEvent(normalized)
+                newlyFetchedEvents.push({
+                  eventId: normalized.id,
+                  eventTitle: normalized.title,
+                  start: normalized.start as string,
+                  end: normalized.end as string,
+                })
+              }
+              if (newlyFetchedEvents.length > 0) {
+                getTimeClient().emit('events:set', {
+                  events: newlyFetchedEvents,
+                })
+              }
+            }
+            this.store.setState((prev) => ({
+              ...prev,
+              isPending: false,
+              eventsVersion:
+                fetchedEvents.length > 0
+                  ? prev.eventsVersion + 1
+                  : prev.eventsVersion,
+            }))
+          })
+          .catch(() => {
+            this._loadedRanges = this._loadedRanges.filter(
+              (r) => !(r.start === rangeStart && r.end === rangeEnd),
+            )
+            this.store.setState((prev) => ({ ...prev, isPending: false }))
+          })
+      }
+    }
+  }
+
+  getDaysWithEvents() {
+    return this._buildDays(this.getCalendarDays())
+  }
+
+  /**
+   * Returns Day objects for every date between `start` and `end` (inclusive),
+   * derived freshly from the current event state. Use this when rendering a
+   * buffered range that spans multiple periods (e.g. infinite scroll) so
+   * mutations (add/edit/remove) are reflected without manual cache invalidation.
+   */
+  getDaysInRange(start: string, end: string) {
+    const days = generateDateRange(start, end)
+    const windowEnd = Temporal.PlainDate.from(end)
+      .add({ days: 1 })
+      .toString({ calendarName: 'never' })
+    return this._buildDays(days, { start, end: windowEnd })
+  }
+
+  private _buildDays(
+    days: Array<Temporal.PlainDate>,
+    window?: { start: string; end: string },
+  ) {
+    const eventMap = this.getEventMap(window)
+    const currentMonthRange = Array.from(
+      { length: this.store.state.viewMode.value },
+      (_, i) => this.store.state.currentPeriod.add({ months: i }).month,
+    )
+    const today = Temporal.Now.plainDateISO()
+    return days.map((day) => {
+      const isoDate = day.toString({ calendarName: 'never' })
+      const dailyEvents = eventMap.get(isoDate) ?? []
+      const timedEvents: Array<TEvent> = []
+      const allDayEvents: Array<TEvent> = []
+      for (const ev of dailyEvents) {
+        if (ev.allDay) allDayEvents.push(ev)
+        else timedEvents.push(ev)
+      }
+      const isInCurrentPeriod = currentMonthRange.includes(day.month)
+      return {
+        date: day,
+        isoDate,
+        events: timedEvents,
+        allDayEvents,
+        isToday: Temporal.PlainDate.compare(day, today) === 0,
+        isInCurrentPeriod,
+      }
+    })
+  }
+
+  getLoadedRanges(): ReadonlyArray<{ start: string; end: string }> {
+    return this._loadedRanges
+  }
+
+  async fetchEventsForRange(start: string, end: string): Promise<void> {
+    if (!this.options.fetchEvents) return
+    if (this._isRangeLoaded(start, end)) return
+
+    this._markRangeLoaded(start, end)
+    this.store.setState((prev) => ({ ...prev, isPending: true }))
+
+    try {
+      const fetchedEvents = await this.options.fetchEvents({ start, end })
+      if (fetchedEvents.length > 0) {
+        if (!this.options.events) this.options.events = []
+        const newlyFetchedEvents: Array<{
+          eventId: string
+          eventTitle: string
+          start: string
+          end: string
+        }> = []
+        for (const raw of fetchedEvents) {
+          if (this._eventMap.has(raw.id)) continue
+          const normalized = this.normalizeEvent(raw)
+          this.options.events.push(normalized)
+          this._indexAddEvent(normalized)
+          newlyFetchedEvents.push({
+            eventId: normalized.id,
+            eventTitle: normalized.title,
+            start: normalized.start as string,
+            end: normalized.end as string,
+          })
+        }
+        if (newlyFetchedEvents.length > 0) {
+          getTimeClient().emit('events:set', {
+            events: newlyFetchedEvents,
+          })
+        }
+      }
+      this.store.setState((prev) => ({
+        ...prev,
+        isPending: false,
+        eventsVersion:
+          fetchedEvents.length > 0
+            ? prev.eventsVersion + 1
+            : prev.eventsVersion,
+      }))
+    } catch {
+      this._loadedRanges = this._loadedRanges.filter(
+        (r) => !(r.start === start && r.end === end),
+      )
+      this.store.setState((prev) => ({ ...prev, isPending: false }))
+    }
+  }
+
+  formatPeriodLabel(options?: { locale?: string }): string {
+    const days = this.getDaysWithEvents()
+    if (days.length === 0) return ''
+
+    const locale = options?.locale ?? this.options.locale
+    const first = days[0]!
+    const last = days[days.length - 1]!
+
+    const fmt = (d: Temporal.PlainDate) =>
+      new Date(d.year, d.month - 1, d.day).toLocaleDateString(locale, {
+        month: 'short',
+        day: 'numeric',
+        year: 'numeric',
+      })
+
+    if (days.length === 1) return fmt(first.date)
+    return `${fmt(first.date)} \u2014 ${fmt(last.date)}`
+  }
+
+  formatCurrentPeriod(options?: { locale?: string }): string {
+    const period = this.store.state.currentPeriod
+    const locale = options?.locale ?? this.options.locale
+    return new Date(
+      period.year,
+      period.month - 1,
+      period.day,
+    ).toLocaleDateString(locale, {
+      month: 'long',
+      year: 'numeric',
+    })
+  }
+
+  getEventSegmentInfo(event: TEvent): SegmentInfo {
+    return getSegmentInfo({
+      start: toPlainDateTimeString(event.start),
+      end: toPlainDateTimeString(event.end),
+      ...(event._originalStart != null
+        ? { _originalStart: event._originalStart }
+        : {}),
+      ...(event._originalEnd != null
+        ? { _originalEnd: event._originalEnd }
+        : {}),
+    })
+  }
+
+  getEventProps(event: TEvent) {
+    return getEventProps(this.getEventMap(), event, this.store.state, {
+      timeZone: this.options.timeZone,
+    }) as ReturnType<CalendarActions<TResource, TEvent>['getEventProps']>
+  }
+
+  groupDaysBy({
+    days,
+    unit,
+    fillMissingDays = true,
+  }: {
+    days: Array<Day<TResource, TEvent> | null>
+    unit: 'week' | 'workWeek'
+    fillMissingDays?: boolean
+  }) {
+    return groupDaysBy<TResource, TEvent>({
+      days,
+      unit,
+      fillMissingDays,
+      weekStartsOn: this.getWeekStartsOn(),
+      locale: this.options.locale,
+    })
+  }
+
+  getTimeSlots(options?: Parameters<typeof getTimeSlots>[1]): Array<TimeSlot> {
+    return getTimeSlots(this.options.locale, options)
+  }
+
+  getEventsByDate(date: string): Array<TEvent> {
+    const targetDate = Temporal.PlainDate.from(date).toString({
+      calendarName: 'never',
+    })
+    const windowEnd = Temporal.PlainDate.from(targetDate)
+      .add({ days: 1 })
+      .toString({ calendarName: 'never' })
+    const eventMap = this.getEventMap({ start: targetDate, end: windowEnd })
+    const all = eventMap.get(targetDate)
+    return all ? [...all] : []
+  }
+
+  getAllDayEventsByDate(date: string): Array<TEvent> {
+    const targetDate = Temporal.PlainDate.from(date).toString({
+      calendarName: 'never',
+    })
+    const windowEnd = Temporal.PlainDate.from(targetDate)
+      .add({ days: 1 })
+      .toString({ calendarName: 'never' })
+    const eventMap = this.getEventMap({ start: targetDate, end: windowEnd })
+    const all = eventMap.get(targetDate) ?? []
+    return all.filter((e) => !!e.allDay)
+  }
+
+  private _snapshotEvents(): Array<TEvent> {
+    return this.options.events ? [...this.options.events] : []
+  }
+
+  private _restoreSnapshot(snapshot: Array<TEvent>) {
+    this._eventMap.clear()
+    this._dependentsMap.clear()
+    this._dateIndex.clear()
+    this.options.events = snapshot
+    snapshot.forEach((e) => this._indexAddEvent(e))
+    this.store.setState((prev) => ({
+      ...prev,
+      eventsVersion: prev.eventsVersion + 1,
+    }))
+  }
+
+  canUndo() {
+    return this._undoStack.length > 0
+  }
+
+  canRedo() {
+    return this._redoStack.length > 0
+  }
+
+  private _diffEvents(before: Array<TEvent>, after: Array<TEvent>) {
+    const beforeMap = new Map(before.map((e) => [e.id, e]))
+    const afterMap = new Map(after.map((e) => [e.id, e]))
+    const added = after.filter((e) => !beforeMap.has(e.id))
+    const removed = before.filter((e) => !afterMap.has(e.id))
+    const updated = after.filter((e) => {
+      const prev = beforeMap.get(e.id)
+      if (!prev) return false
+      return (
+        prev.start !== e.start || prev.end !== e.end || prev.title !== e.title
+      )
+    })
+    const toInfo = (e: TEvent) => ({
+      eventId: e.id,
+      eventTitle: e.title,
+      start: e.start as string,
+      end: e.end as string,
+    })
+    return {
+      added: added.map(toInfo),
+      removed: removed.map(toInfo),
+      updated: updated.map(toInfo),
+    }
+  }
+
+  undo() {
+    if (this._undoStack.length === 0) return
+    const before = this._snapshotEvents()
+    this._redoStack.push(before)
+    const restored = this._undoStack.pop()!
+    this._restoreSnapshot(restored)
+    getTimeClient().emit('event:undo', this._diffEvents(before, restored))
+  }
+
+  redo() {
+    if (this._redoStack.length === 0) return
+    const before = this._snapshotEvents()
+    this._undoStack.push(before)
+    const restored = this._redoStack.pop()!
+    this._restoreSnapshot(restored)
+    getTimeClient().emit('event:redo', this._diffEvents(before, restored))
+  }
+
+  commitAdd(event: TEvent) {
+    this._undoStack.push(this._snapshotEvents())
+    this._redoStack = []
+    if (!this.options.events) {
+      this.options.events = []
+    }
+    const normalized = this.normalizeEvent(event)
+    this.options.events.push(normalized)
+    this._indexAddEvent(normalized)
+    this.store.setState((prev) => ({
+      ...prev,
+      eventsVersion: prev.eventsVersion + 1,
+    }))
+
+    getTimeClient().emit('event:added', {
+      eventId: normalized.id,
+      eventTitle: normalized.title,
+      start: normalized.start as string,
+      end: normalized.end as string,
+    })
+  }
+
+  commitUpdate(id: Event['id'], updates: Partial<Omit<TEvent, 'id'>>) {
+    if (!this.options.events) return
+
+    const existingEvent = this._eventMap.get(id)
+    if (!existingEvent) return
+
+    this._undoStack.push(this._snapshotEvents())
+    this._redoStack = []
+
+    const index = this.options.events.indexOf(existingEvent)
+    if (index === -1) return
+
+    const oldStartStr = toPlainDateTimeString(existingEvent.start)
+    const oldEndStr = toPlainDateTimeString(existingEvent.end)
+
+    const recurrenceUpdate = (updates as { recurrence?: TEvent['recurrence'] })
+      .recurrence
+    const normalizedUpdates = {
+      ...updates,
+      ...(updates.start != null
+        ? { start: toPlainDateTimeString(updates.start) }
+        : {}),
+      ...(updates.end != null
+        ? { end: toPlainDateTimeString(updates.end) }
+        : {}),
+      ...(recurrenceUpdate != null
+        ? {
+            recurrence:
+              this._normalizeRecurrenceDateTimeInputs(recurrenceUpdate),
+          }
+        : {}),
+    }
+
+    const nextEvent = {
+      ...existingEvent,
+      ...normalizedUpdates,
+    } as TEvent
+    this.options.events[index] = nextEvent
+    this._indexUpdateEvent(existingEvent, nextEvent)
+
+    const visited = new Set([id])
+
+    const newStart = normalizedUpdates.start as string | undefined
+    const newEnd = normalizedUpdates.end as string | undefined
+    if (newStart && newStart !== oldStartStr) {
+      this.propagateStartDeltaBackward(id, visited)
+    }
+
+    const startChanged = newStart && newStart !== oldStartStr
+    const endChanged = newEnd && newEnd !== oldEndStr
+
+    if (startChanged || endChanged) {
+      this.propagateEndDelta(id, 0, visited)
+    }
+
+    this.store.setState((prev) => ({
+      ...prev,
+      eventsVersion: prev.eventsVersion + 1,
+    }))
+
+    getTimeClient().emit('event:updated', {
+      eventId: id,
+      eventTitle: existingEvent.title,
+      start: toPlainDateTimeString(nextEvent.start),
+      end: toPlainDateTimeString(nextEvent.end),
+      updates: normalizedUpdates as Record<string, unknown>,
+    })
+  }
+
+  private propagateStartDeltaBackward(sourceId: string, visited: Set<string>) {
+    const sourceEvent = this._eventMap.get(sourceId)
+    if (!sourceEvent?.dependsOn?.length) return
+
+    const sourceStartStr = toPlainDateTimeString(sourceEvent.start)
+    const sourceEndStr = toPlainDateTimeString(sourceEvent.end)
+    const tz = this.options.timeZone
+    const sourceStartMs =
+      Temporal.PlainDateTime.from(sourceStartStr).toZonedDateTime(
+        tz,
+      ).epochMilliseconds
+    const sourceEndMs =
+      Temporal.PlainDateTime.from(sourceEndStr).toZonedDateTime(
+        tz,
+      ).epochMilliseconds
+
+    for (const dep of sourceEvent.dependsOn) {
+      if (visited.has(dep.id)) continue
+
+      const pred = this._eventMap.get(dep.id)
+      if (!pred) continue
+      const predArr = this.options.events
+      if (!predArr) continue
+      const predIndex = predArr.indexOf(pred)
+      if (predIndex === -1) continue
+
+      const predStartStr = toPlainDateTimeString(pred.start)
+      const predEndStr = toPlainDateTimeString(pred.end)
+      const predStartMs =
+        Temporal.PlainDateTime.from(predStartStr).toZonedDateTime(
+          tz,
+        ).epochMilliseconds
+      const predEndMs =
+        Temporal.PlainDateTime.from(predEndStr).toZonedDateTime(
+          tz,
+        ).epochMilliseconds
+
+      const pullBackMs = requiredBackwardShiftMs(
+        dep.type,
+        predStartMs,
+        predEndMs,
+        sourceStartMs,
+        sourceEndMs,
+      )
+      if (pullBackMs <= 0) continue
+
+      visited.add(dep.id)
+
+      const shiftedStart = Temporal.PlainDateTime.from(predStartStr)
+        .subtract({ milliseconds: pullBackMs })
+        .toString({ smallestUnit: 'second' })
+      const shiftedEnd = Temporal.PlainDateTime.from(predEndStr)
+        .subtract({ milliseconds: pullBackMs })
+        .toString({ smallestUnit: 'second' })
+
+      const updated = {
+        ...pred,
+        start: shiftedStart,
+        end: shiftedEnd,
+      } as TEvent
+      predArr[predIndex] = updated
+      this._indexUpdateEvent(pred, updated)
+
+      getTimeClient().emit('event:updated', {
+        eventId: pred.id,
+        eventTitle: pred.title,
+        start: shiftedStart,
+        end: shiftedEnd,
+        updates: { start: shiftedStart, end: shiftedEnd } as Record<
+          string,
+          unknown
+        >,
+      })
+
+      this.propagateStartDeltaBackward(dep.id, visited)
+    }
+  }
+
+  private propagateEndDelta(
+    sourceId: string,
+    _deltaMs: number,
+    visited: Set<string>,
+  ) {
+    const sourceEvent = this._eventMap.get(sourceId)
+    if (!sourceEvent) return
+
+    const tz = this.options.timeZone
+    const sourceStartMs = Temporal.PlainDateTime.from(
+      toPlainDateTimeString(sourceEvent.start),
+    ).toZonedDateTime(tz).epochMilliseconds
+    const sourceEndMs = Temporal.PlainDateTime.from(
+      toPlainDateTimeString(sourceEvent.end),
+    ).toZonedDateTime(tz).epochMilliseconds
+
+    const dependentIds = this._dependentsMap.get(sourceId)
+    if (!dependentIds || dependentIds.size === 0) return
+
+    const eventsArr = this.options.events
+    if (!eventsArr) return
+
+    for (const depId of dependentIds) {
+      if (visited.has(depId)) continue
+
+      const dependent = this._eventMap.get(depId)
+      if (!dependent) continue
+
+      const link = dependent.dependsOn?.find((d) => d.id === sourceId)
+      if (!link) continue
+
+      visited.add(dependent.id)
+
+      const eventIndex = eventsArr.indexOf(dependent)
+      if (eventIndex === -1) continue
+
+      const depStartStr = toPlainDateTimeString(dependent.start)
+      const depEndStr = toPlainDateTimeString(dependent.end)
+      const depStartMs =
+        Temporal.PlainDateTime.from(depStartStr).toZonedDateTime(
+          tz,
+        ).epochMilliseconds
+      const depEndMs =
+        Temporal.PlainDateTime.from(depEndStr).toZonedDateTime(
+          tz,
+        ).epochMilliseconds
+
+      const shiftMs = requiredForwardShiftMs(
+        link.type,
+        sourceStartMs,
+        sourceEndMs,
+        depStartMs,
+        depEndMs,
+      )
+      if (shiftMs <= 0) continue
+
+      const shiftedStart = Temporal.PlainDateTime.from(depStartStr)
+        .add({ milliseconds: shiftMs })
+        .toString({ smallestUnit: 'second' })
+      const shiftedEnd = Temporal.PlainDateTime.from(depEndStr)
+        .add({ milliseconds: shiftMs })
+        .toString({ smallestUnit: 'second' })
+
+      const updated = {
+        ...dependent,
+        start: shiftedStart,
+        end: shiftedEnd,
+      } as TEvent
+      eventsArr[eventIndex] = updated
+      this._indexUpdateEvent(dependent, updated)
+
+      getTimeClient().emit('event:updated', {
+        eventId: dependent.id,
+        eventTitle: dependent.title,
+        start: shiftedStart,
+        end: shiftedEnd,
+        updates: { start: shiftedStart, end: shiftedEnd } as Record<
+          string,
+          unknown
+        >,
+      })
+
+      this.propagateEndDelta(dependent.id, shiftMs, visited)
+    }
+  }
+
+  private getAffectedByDelta(
+    sourceId: string,
+    deltaMs: number,
+    visited: Set<string>,
+  ): Array<{ event: TEvent; newStart: string; newEnd: string }> {
+    if (deltaMs === 0) return []
+
+    const tz = this.options.timeZone
+    const affected: Array<{ event: TEvent; newStart: string; newEnd: string }> =
+      []
+
+    const projected = new Map<string, { startMs: number; endMs: number }>()
+
+    const sourceEvent = this._eventMap.get(sourceId)
+    if (!sourceEvent) return []
+
+    const srcStartMs =
+      Temporal.PlainDateTime.from(
+        toPlainDateTimeString(sourceEvent.start),
+      ).toZonedDateTime(tz).epochMilliseconds + deltaMs
+    const srcEndMs =
+      Temporal.PlainDateTime.from(
+        toPlainDateTimeString(sourceEvent.end),
+      ).toZonedDateTime(tz).epochMilliseconds + deltaMs
+    projected.set(sourceId, { startMs: srcStartMs, endMs: srcEndMs })
+
+    const queue: Array<string> = [sourceId]
+
+    while (queue.length > 0) {
+      const currentId = queue.shift()!
+      const cur = projected.get(currentId)!
+
+      const successorIds = this._dependentsMap.get(currentId)
+      if (!successorIds || successorIds.size === 0) continue
+
+      for (const sId of successorIds) {
+        if (visited.has(sId)) continue
+        const s = this._eventMap.get(sId)
+        if (!s) continue
+
+        const link = s.dependsOn?.find((d) => d.id === currentId)
+        if (!link) continue
+
+        const sStartStr = toPlainDateTimeString(s.start)
+        const sEndStr = toPlainDateTimeString(s.end)
+        const sStartMs =
+          Temporal.PlainDateTime.from(sStartStr).toZonedDateTime(
+            tz,
+          ).epochMilliseconds
+        const sEndMs =
+          Temporal.PlainDateTime.from(sEndStr).toZonedDateTime(
+            tz,
+          ).epochMilliseconds
+
+        const shiftMs = requiredForwardShiftMs(
+          link.type,
+          cur.startMs,
+          cur.endMs,
+          sStartMs,
+          sEndMs,
+        )
+        if (shiftMs <= 0) continue
+
+        visited.add(sId)
+        const newStart = Temporal.PlainDateTime.from(sStartStr)
+          .add({ milliseconds: shiftMs })
+          .toString({ smallestUnit: 'second' })
+        const newEnd = Temporal.PlainDateTime.from(sEndStr)
+          .add({ milliseconds: shiftMs })
+          .toString({ smallestUnit: 'second' })
+        affected.push({ event: s, newStart, newEnd })
+
+        projected.set(sId, {
+          startMs: sStartMs + shiftMs,
+          endMs: sEndMs + shiftMs,
+        })
+        queue.push(sId)
+      }
+    }
+
+    return affected
+  }
+
+  private checkEventAvailability(
+    event: TEvent,
+    newStart: string,
+    newEnd: string,
+    newResources?: Array<TResource | string>,
+    newConsumption?: Array<number>,
+  ): AvailabilityConflict | null {
+    const resources =
+      newResources?.map((r) =>
+        typeof r === 'string'
+          ? (this.options.resources?.find((res) => res.id === r) ??
+            ({ id: r, label: r } as TResource))
+          : r,
+      ) || this._resolveEventResources(event)
+    if (!resources?.length) return null
+
+    const resourceIds = resources.map((r) => r.id)
+    const startDt = Temporal.PlainDateTime.from(newStart)
+    const endDt = Temporal.PlainDateTime.from(newEnd)
+
+    const startDate = startDt.toPlainDate()
+    const endDate = endDt.toPlainDate()
+    let cursorDate = startDate
+
+    const eventConsumptionArr = newConsumption ?? event.consumption ?? [1]
+    const eventConsumptionSum = eventConsumptionArr.reduce((a, b) => a + b, 0)
+
+    while (Temporal.PlainDate.compare(cursorDate, endDate) <= 0) {
+      const dayStr = cursorDate.toString({ calendarName: 'never' })
+      const isSameAsStart =
+        Temporal.PlainDate.compare(cursorDate, startDate) === 0
+      const isSameAsEnd = Temporal.PlainDate.compare(cursorDate, endDate) === 0
+
+      const overlapStartMins = isSameAsStart
+        ? startDt.hour * 60 + startDt.minute
+        : 0
+      let overlapEndMins: number
+      if (isSameAsEnd) {
+        const endMins = endDt.hour * 60 + endDt.minute
+        overlapEndMins =
+          endMins === 0 && !isSameAsStart ? 0 : endMins || MINUTES_IN_DAY
+      } else {
+        overlapEndMins = MINUTES_IN_DAY
+      }
+
+      if (overlapStartMins < overlapEndMins) {
+        const details = this.getUnavailabilityDetails(
+          dayStr,
+          overlapStartMins,
+          overlapEndMins,
+          { resourceIds },
+        )
+
+        if (details.length > 0) {
+          return {
+            date: dayStr,
+            conflictRange: {
+              start: formatMinutesToTime(overlapStartMins),
+              end: formatMinutesToTime(overlapEndMins),
+            },
+            resourceIds,
+            resourceDetails: details.map((d) => ({
+              resourceId: d.resourceId,
+              resourceLabel: d.resourceLabel,
+              reason: d.reason,
+              description: `"${event.title}": ${d.description}`,
+            })),
+            description: `"${event.title}" would be pushed to unavailable time: ${details.map((d) => d.description).join('; ')}`,
+          }
+        }
+
+        const eventsOnDay: Array<TEvent> = []
+        for (const candidate of this._eventMap.values()) {
+          if (candidate._originalStart) continue
+          const cStart = Temporal.PlainDateTime.from(
+            toPlainDateTimeString(candidate.start),
+          ).toPlainDate()
+          const cEnd = Temporal.PlainDateTime.from(
+            toPlainDateTimeString(candidate.end),
+          ).toPlainDate()
+          if (
+            Temporal.PlainDate.compare(cursorDate, cStart) >= 0 &&
+            Temporal.PlainDate.compare(cursorDate, cEnd) <= 0
+          ) {
+            eventsOnDay.push(candidate)
+          }
+        }
+        for (const resource of resources) {
+          if (!resource.capacity || resource.capacity.length === 0) continue
+          const capacitySum = resource.capacity.reduce((a, b) => a + b, 0)
+          if (capacitySum <= 0) continue
+
+          const overlappingEvents = eventsOnDay.filter((e) => {
+            const masterId = e._recurringMasterId ?? e.id
+            const selfId = event.id
+            if (e.id === selfId || masterId === selfId) return false
+
+            const eventResourceIds = this._getEventResourceIds(e)
+            if (!eventResourceIds.includes(resource.id)) return false
+
+            const eOrigStart = (e._originalStart ?? e.start) as
+              | string
+              | Date
+              | number
+            const eOrigEnd = (e._originalEnd ?? e.end) as string | Date | number
+            const eStartDt = Temporal.PlainDateTime.from(
+              toPlainDateTimeString(eOrigStart),
+            )
+            const eEndDt = Temporal.PlainDateTime.from(
+              toPlainDateTimeString(eOrigEnd),
+            )
+
+            const eStartDate = eStartDt.toPlainDate()
+            const eEndDate = eEndDt.toPlainDate()
+            const cursorIsStart =
+              Temporal.PlainDate.compare(cursorDate, eStartDate) === 0
+            const cursorIsEnd =
+              Temporal.PlainDate.compare(cursorDate, eEndDate) === 0
+            const cursorAfterStart =
+              Temporal.PlainDate.compare(cursorDate, eStartDate) >= 0
+            const cursorBeforeEnd =
+              Temporal.PlainDate.compare(cursorDate, eEndDate) <= 0
+            if (!cursorAfterStart || !cursorBeforeEnd) return false
+
+            const eStartMins = cursorIsStart
+              ? eStartDt.hour * 60 + eStartDt.minute
+              : 0
+            let eEndMins: number
+            if (cursorIsEnd) {
+              const m = eEndDt.hour * 60 + eEndDt.minute
+              eEndMins = m === 0 && !cursorIsStart ? 0 : m || MINUTES_IN_DAY
+            } else {
+              eEndMins = MINUTES_IN_DAY
+            }
+
+            return overlapStartMins < eEndMins && overlapEndMins > eStartMins
+          })
+
+          const seen = new Set<string>()
+          let usedByOthers = 0
+          for (const oe of overlappingEvents) {
+            const key = oe.id
+            if (seen.has(key)) continue
+            seen.add(key)
+            const c = oe.consumption ?? [1]
+            usedByOthers += c.reduce((a, b) => a + b, 0)
+          }
+
+          const totalUsage = usedByOthers + eventConsumptionSum
+          if (totalUsage > capacitySum) {
+            return {
+              date: dayStr,
+              conflictRange: {
+                start: formatMinutesToTime(overlapStartMins),
+                end: formatMinutesToTime(overlapEndMins),
+              },
+              resourceIds: [resource.id],
+              resourceDetails: [
+                {
+                  resourceId: resource.id,
+                  resourceLabel: resource.label,
+                  reason: 'capacity',
+                  description: `"${event.title}": ${resource.label} capacity exceeded (${totalUsage}/${capacitySum} units used)`,
+                  capacityInfo: {
+                    max: capacitySum,
+                    used: totalUsage,
+                    remaining: Math.max(0, capacitySum - usedByOthers),
+                  },
+                },
+              ],
+              description: `"${event.title}" exceeds ${resource.label} capacity (${totalUsage}/${capacitySum})`,
+            }
+          }
+        }
+      }
+
+      cursorDate = cursorDate.add({ days: 1 })
+    }
+
+    return null
+  }
+
+  getMasterEvent(event: TEvent): TEvent {
+    if (!event._recurringMasterId) return event
+    return this._eventMap.get(event._recurringMasterId) ?? event
+  }
+
+  getEvents(): Array<TEvent> {
+    return this.options.events ? [...this.options.events] : []
+  }
+
+  private _resolveMasterEvent(eventId: string): TEvent | undefined {
+    const direct = this._eventMap.get(eventId)
+    if (direct) return direct
+    const match = eventId.match(/^(.+)_\d+$/)
+    if (match) return this._eventMap.get(match[1]!)
+    return undefined
+  }
+
+  private _resolveOccurrenceStart(
+    master: TEvent,
+    occurrenceStart?: EventDateTimeInput,
+  ): string {
+    return occurrenceStart != null
+      ? toPlainDateTimeString(occurrenceStart)
+      : toPlainDateTimeString(master.start)
+  }
+
+  private _recurrenceInputMatchesOccurrence(
+    value: EventDateTimeInput,
+    occurrenceStart: string,
+  ): boolean {
+    if (typeof value === 'string' && !value.includes('T')) {
+      return (
+        Temporal.PlainDate.from(value).toString({ calendarName: 'never' }) ===
+        occurrenceStart.split('T')[0]
+      )
+    }
+    return toPlainDateTimeString(value) === occurrenceStart
+  }
+
+  private _compareRecurrenceInputToOccurrence(
+    value: EventDateTimeInput,
+    occurrenceStart: string,
+  ): number {
+    if (typeof value === 'string' && !value.includes('T')) {
+      return Temporal.PlainDate.compare(
+        Temporal.PlainDate.from(value),
+        Temporal.PlainDate.from(occurrenceStart.split('T')[0]!),
+      )
+    }
+    return Temporal.PlainDateTime.compare(
+      Temporal.PlainDateTime.from(toPlainDateTimeString(value)),
+      Temporal.PlainDateTime.from(occurrenceStart),
+    )
+  }
+
+  private _durationPreservingEnd(
+    originalStart: string,
+    originalEnd: string,
+    nextStart: string,
+  ): string {
+    const durationMs = Temporal.PlainDateTime.from(originalStart)
+      .toZonedDateTime('UTC')
+      .until(Temporal.PlainDateTime.from(originalEnd).toZonedDateTime('UTC'))
+      .total('milliseconds')
+    return Temporal.PlainDateTime.from(nextStart)
+      .toZonedDateTime('UTC')
+      .add({ milliseconds: durationMs })
+      .toPlainDateTime()
+      .toString({ smallestUnit: 'second' })
+  }
+
+  private _normalizeRecurrenceDateTimeInputs(
+    rule: NonNullable<TEvent['recurrence']>,
+  ): NonNullable<TEvent['recurrence']> {
+    return {
+      ...rule,
+      exDates: rule.exDates?.map((value) =>
+        typeof value === 'string' && !value.includes('T')
+          ? value
+          : toPlainDateTimeString(value),
+      ),
+      overrides: rule.overrides?.map((override) => ({
+        ...override,
+        originalStart:
+          typeof override.originalStart === 'string' &&
+          !override.originalStart.includes('T')
+            ? override.originalStart
+            : toPlainDateTimeString(override.originalStart),
+        ...(override.start != null
+          ? { start: toPlainDateTimeString(override.start) }
+          : {}),
+        ...(override.end != null
+          ? { end: toPlainDateTimeString(override.end) }
+          : {}),
+      })),
+    }
+  }
+
+  private _getRecurringOccurrence(
+    master: TEvent,
+    occurrenceStart: string,
+  ): TEvent | null {
+    const occurrenceDate = occurrenceStart.split('T')[0]!
+    let windowStart = occurrenceDate
+    let windowEnd = Temporal.PlainDate.from(occurrenceDate)
+      .add({ days: 1 })
+      .toString({ calendarName: 'never' })
+
+    const override = master.recurrence?.overrides?.find((candidate) =>
+      this._recurrenceInputMatchesOccurrence(
+        candidate.originalStart,
+        occurrenceStart,
+      ),
+    )
+    if (override?.start != null) {
+      const overrideDate = toPlainDateTimeString(override.start).split('T')[0]!
+      windowStart =
+        overrideDate < occurrenceDate ? overrideDate : occurrenceDate
+      const maxDate =
+        overrideDate > occurrenceDate ? overrideDate : occurrenceDate
+      windowEnd = Temporal.PlainDate.from(maxDate)
+        .add({ days: 1 })
+        .toString({ calendarName: 'never' })
+    }
+
+    const occurrences = expandRecurringEvent<TResource, TEvent>(
+      master,
+      windowStart,
+      windowEnd,
+    )
+    return (
+      occurrences.find(
+        (occ) =>
+          (occ._occurrenceOriginalStart ?? occ.start) === occurrenceStart,
+      ) ?? null
+    )
+  }
+
+  private _resolveResizeEvent(
+    eventId: string,
+    occurrenceStart?: string,
+    originalStart?: string,
+  ): TEvent | undefined {
+    const direct = this._eventMap.get(eventId)
+    const master = this._resolveMasterEvent(eventId)
+
+    if (master?.recurrence) {
+      const resolvedOccurrenceStart =
+        occurrenceStart ??
+        (direct ? toPlainDateTimeString(direct.start) : originalStart)
+      if (resolvedOccurrenceStart) {
+        return (
+          this._getRecurringOccurrence(master, resolvedOccurrenceStart) ??
+          direct ??
+          master
+        )
+      }
+    }
+
+    return direct
+  }
+
+  private _makeSplitRecurringEventId(master: TEvent, occurrenceStart: string) {
+    const safeStart = occurrenceStart.replace(/[^0-9A-Za-z]/g, '')
+    let id = `${master.id}_${safeStart}`
+    let suffix = 1
+    while (this._eventMap.has(id)) {
+      id = `${master.id}_${safeStart}_${suffix}`
+      suffix++
+    }
+    return id
+  }
+
+  private _commitRecurringUpdate(
+    master: TEvent,
+    nextMaster: TEvent | null,
+    addedEvents: Array<TEvent> = [],
+    emit:
+      | {
+          type: 'updated'
+          eventId: string
+          eventTitle: string
+          start: string
+          end: string
+          updates: Record<string, unknown>
+        }
+      | {
+          type: 'removed'
+          eventId: string
+          eventTitle: string
+          start: string
+          end: string
+        },
+  ) {
+    if (!this.options.events) return
+    const index = this.options.events.indexOf(master)
+    if (index === -1) return
+
+    this._undoStack.push(this._snapshotEvents())
+    this._redoStack = []
+
+    if (nextMaster) {
+      this.options.events[index] = nextMaster
+      this._indexUpdateEvent(master, nextMaster)
+    } else {
+      this.options.events.splice(index, 1)
+      this._indexRemoveEvent(master)
+    }
+
+    for (const added of addedEvents) {
+      this.options.events.push(added)
+      this._indexAddEvent(added)
+    }
+
+    this.store.setState((prev) => ({
+      ...prev,
+      eventsVersion: prev.eventsVersion + 1,
+    }))
+
+    for (const added of addedEvents) {
+      getTimeClient().emit('event:added', {
+        eventId: added.id,
+        eventTitle: added.title,
+        start: added.start as string,
+        end: added.end as string,
+      })
+    }
+
+    if (emit.type === 'updated') {
+      getTimeClient().emit('event:updated', {
+        eventId: emit.eventId,
+        eventTitle: emit.eventTitle,
+        start: emit.start,
+        end: emit.end,
+        updates: emit.updates,
+      })
+    } else {
+      getTimeClient().emit('event:removed', {
+        eventId: emit.eventId,
+        eventTitle: emit.eventTitle,
+        start: emit.start,
+        end: emit.end,
+      })
+    }
+  }
+
+  goToNextOccurrence(eventId: string, fromDate?: EventDateTimeInput) {
+    const master = this._resolveMasterEvent(eventId)
+    if (!master?.recurrence) return
+
+    const baseDate = fromDate
+      ? Temporal.PlainDate.from(toPlainDateTimeString(fromDate).split('T')[0]!)
+      : this.store.state.activeDate
+    const windowStart = baseDate
+      .add({ days: 1 })
+      .toString({ calendarName: 'never' })
+    const windowEnd = baseDate
+      .add({ years: 4 })
+      .toString({ calendarName: 'never' })
+
+    const occurrences = expandRecurringEvent<TResource, TEvent>(
+      master,
+      windowStart,
+      windowEnd,
+    )
+    if (occurrences.length === 0) return
+
+    this.goToSpecificPeriod((occurrences[0]!.start as string).split('T')[0]!)
+  }
+
+  goToPreviousOccurrence(eventId: string, fromDate?: EventDateTimeInput) {
+    const master = this._resolveMasterEvent(eventId)
+    if (!master?.recurrence) return
+
+    const activeDateStr = fromDate
+      ? toPlainDateTimeString(fromDate).split('T')[0]!
+      : this.store.state.activeDate.toString({ calendarName: 'never' })
+    const masterStartStr = (master.start as string).split('T')[0]!
+
+    if (masterStartStr >= activeDateStr) return
+
+    const occurrences = expandRecurringEvent<TResource, TEvent>(
+      master,
+      masterStartStr,
+      activeDateStr,
+    )
+    const candidates = occurrences
+      .map((occ) => (occ.start as string).split('T')[0]!)
+      .filter((occDateStr) => occDateStr < activeDateStr)
+
+    if (candidates.length === 0) return
+    this.goToSpecificPeriod(candidates[candidates.length - 1]!)
+  }
+
+  createResizeController(
+    options: ResizeControllerOptions = {},
+  ): ResizeController<TResource, TEvent> {
+    return new ResizeController<TResource, TEvent>(this, options)
+  }
+
+  validateMove(
+    eventId: string,
+    newStart: string,
+    newEnd: string,
+    newResources?: Array<TResource | string>,
+    newConsumption?: Array<number>,
+  ): { blocked: boolean; blockedEventTitle?: string; message?: string } {
+    const event = this._eventMap.get(eventId)
+    if (!event || event._originalStart) return { blocked: false }
+
+    const tz = this.options.timeZone
+    const newStartMs =
+      Temporal.PlainDateTime.from(newStart).toZonedDateTime(
+        tz,
+      ).epochMilliseconds
+    const newEndMs =
+      Temporal.PlainDateTime.from(newEnd).toZonedDateTime(tz).epochMilliseconds
+
+    if (event.dependsOn?.length) {
+      const visited = new Set<string>([eventId])
+      const queue: Array<{ id: string; startMs: number; endMs: number }> = [
+        { id: eventId, startMs: newStartMs, endMs: newEndMs },
+      ]
+
+      while (queue.length > 0) {
+        const current = queue.shift()!
+        const currentEvent = this._eventMap.get(current.id)
+        if (!currentEvent?.dependsOn?.length) continue
+
+        for (const dep of currentEvent.dependsOn) {
+          if (visited.has(dep.id)) continue
+          const pred = this._eventMap.get(dep.id)
+          if (!pred) continue
+
+          const predStartStr = toPlainDateTimeString(pred.start)
+          const predEndStr = toPlainDateTimeString(pred.end)
+          const predStartMs =
+            Temporal.PlainDateTime.from(predStartStr).toZonedDateTime(
+              tz,
+            ).epochMilliseconds
+          const predEndMs =
+            Temporal.PlainDateTime.from(predEndStr).toZonedDateTime(
+              tz,
+            ).epochMilliseconds
+
+          const pullBackMs = requiredBackwardShiftMs(
+            dep.type,
+            predStartMs,
+            predEndMs,
+            current.startMs,
+            current.endMs,
+          )
+          if (pullBackMs <= 0) continue
+
+          visited.add(dep.id)
+
+          const shiftedStart = Temporal.PlainDateTime.from(predStartStr)
+            .subtract({ milliseconds: pullBackMs })
+            .toString({ smallestUnit: 'second' })
+          const shiftedEnd = Temporal.PlainDateTime.from(predEndStr)
+            .subtract({ milliseconds: pullBackMs })
+            .toString({ smallestUnit: 'second' })
+
+          const predConflict = this.checkEventAvailability(
+            pred,
+            shiftedStart,
+            shiftedEnd,
+          )
+          if (predConflict) {
+            return {
+              blocked: true,
+              blockedEventTitle: pred.title,
+              message: `"${pred.title}" would be pulled into unavailable time.`,
+            }
+          }
+
+          queue.push({
+            id: dep.id,
+            startMs: predStartMs - pullBackMs,
+            endMs: predEndMs - pullBackMs,
+          })
+        }
+      }
+    }
+
+    const conflict = this.checkEventAvailability(
+      event,
+      newStart,
+      newEnd,
+      newResources,
+      newConsumption,
+    )
+    if (conflict) {
+      const isCapacity = conflict.resourceDetails.some(
+        (d) => d.reason === 'capacity',
+      )
+      const message = isCapacity
+        ? `"${event.title}" cannot be placed here — ${conflict.description}.`
+        : `"${event.title}" cannot be placed here — it falls inside an unavailable zone.`
+      return {
+        blocked: true,
+        blockedEventTitle: event.title,
+        message,
+      }
+    }
+
+    const oldStartMs = Temporal.PlainDateTime.from(
+      toPlainDateTimeString(event.start),
+    ).toZonedDateTime(tz).epochMilliseconds
+    const startDeltaMs = newStartMs - oldStartMs
+
+    if (startDeltaMs !== 0) {
+      const affected = this.getAffectedByDelta(
+        eventId,
+        startDeltaMs,
+        new Set([eventId]),
+      )
+      for (const {
+        event: dep,
+        newStart: depStart,
+        newEnd: depEnd,
+      } of affected) {
+        const depConflict = this.checkEventAvailability(dep, depStart, depEnd)
+        if (depConflict) {
+          return {
+            blocked: true,
+            blockedEventTitle: dep.title,
+            message: `"${dep.title}" would be pushed to unavailable time.`,
+          }
+        }
+      }
+    }
+
+    const oldEndMs = Temporal.PlainDateTime.from(
+      toPlainDateTimeString(event.end),
+    ).toZonedDateTime(tz).epochMilliseconds
+    const endDeltaMs = newEndMs - oldEndMs
+
+    if (endDeltaMs > 0) {
+      const endVisited = new Set<string>([eventId])
+      const endQueue: Array<{
+        id: string
+        projStartMs: number
+        projEndMs: number
+      }> = [{ id: eventId, projStartMs: newStartMs, projEndMs: newEndMs }]
+
+      while (endQueue.length > 0) {
+        const { id: curId, projStartMs, projEndMs } = endQueue.shift()!
+        const succIds = this._dependentsMap.get(curId)
+        if (!succIds?.size) continue
+
+        for (const sId of succIds) {
+          if (endVisited.has(sId)) continue
+          const s = this._eventMap.get(sId)
+          if (!s) continue
+
+          const link = s.dependsOn?.find((d) => d.id === curId)
+          if (!link) continue
+
+          const sStartStr = toPlainDateTimeString(s.start)
+          const sEndStr = toPlainDateTimeString(s.end)
+          const sStartMs =
+            Temporal.PlainDateTime.from(sStartStr).toZonedDateTime(
+              tz,
+            ).epochMilliseconds
+          const sEndMs =
+            Temporal.PlainDateTime.from(sEndStr).toZonedDateTime(
+              tz,
+            ).epochMilliseconds
+
+          const shiftMs = requiredForwardShiftMs(
+            link.type,
+            projStartMs,
+            projEndMs,
+            sStartMs,
+            sEndMs,
+          )
+          if (shiftMs <= 0) continue
+
+          endVisited.add(sId)
+
+          const sNewStart = Temporal.PlainDateTime.from(sStartStr)
+            .add({ milliseconds: shiftMs })
+            .toString({ smallestUnit: 'second' })
+          const sNewEnd = Temporal.PlainDateTime.from(sEndStr)
+            .add({ milliseconds: shiftMs })
+            .toString({ smallestUnit: 'second' })
+
+          const sConflict = this.checkEventAvailability(s, sNewStart, sNewEnd)
+          if (sConflict) {
+            return {
+              blocked: true,
+              blockedEventTitle: s.title,
+              message: `"${s.title}" would be pushed into unavailable time.`,
+            }
+          }
+
+          endQueue.push({
+            id: sId,
+            projStartMs: sStartMs + shiftMs,
+            projEndMs: sEndMs + shiftMs,
+          })
+        }
+      }
+    }
+
+    return { blocked: false }
+  }
+
+  validateEventDependencies(
+    event: { id?: string; title: string; start: string; end: string },
+    dependsOn: Array<EventDependency>,
+  ): { valid: boolean; error?: ResizeError } {
+    if (this._eventMap.size === 0) return { valid: true }
+
+    const tz = this.options.timeZone
+    const newStartMs = Temporal.PlainDateTime.from(event.start).toZonedDateTime(
+      tz,
+    ).epochMilliseconds
+    const newEndMs = Temporal.PlainDateTime.from(event.end).toZonedDateTime(
+      tz,
+    ).epochMilliseconds
+
+    for (const dep of dependsOn) {
+      const pred = this._eventMap.get(dep.id)
+      if (!pred) continue
+
+      const predStartMs = Temporal.PlainDateTime.from(
+        toPlainDateTimeString(pred.start),
+      ).toZonedDateTime(tz).epochMilliseconds
+      const predEndMs = Temporal.PlainDateTime.from(
+        toPlainDateTimeString(pred.end),
+      ).toZonedDateTime(tz).epochMilliseconds
+
+      const shortfall = requiredForwardShiftMs(
+        dep.type,
+        predStartMs,
+        predEndMs,
+        newStartMs,
+        newEndMs,
+      )
+
+      if (shortfall > 0) {
+        const reason = {
+          FS: `cannot start before "${pred.title}" ends`,
+          SS: `cannot start before "${pred.title}" starts`,
+          FF: `cannot end before "${pred.title}" ends`,
+          SF: `cannot end before "${pred.title}" starts`,
+        }[dep.type]
+
+        return {
+          valid: false,
+          error: {
+            eventId: event.id ?? '',
+            eventTitle: event.title,
+            reason: 'blocked',
+            message: `"${event.title}" ${reason} (${dep.type})`,
+            originalStart: event.start,
+            originalEnd: event.end,
+          },
+        }
+      }
+    }
+    return { valid: true }
+  }
+
+  validateEventPlacement(event: {
+    id?: string
+    title: string
+    start: string
+    end: string
+    resources?: Array<TResource | string>
+    consumption?: Array<number>
+  }): { blocked: boolean; message?: string } {
+    const placeholderEvent = {
+      id: event.id ?? '__validate_placement__',
+      title: event.title,
+      start: event.start,
+      end: event.end,
+      resources: event.resources,
+      consumption: event.consumption,
+    } as TEvent
+
+    const conflict = this.checkEventAvailability(
+      placeholderEvent,
+      event.start,
+      event.end,
+      event.resources,
+      event.consumption,
+    )
+
+    if (conflict) {
+      const isCapacity = conflict.resourceDetails.some(
+        (d) => d.reason === 'capacity',
+      )
+      const message = isCapacity
+        ? `Cannot place "${event.title}" here — ${conflict.description}.`
+        : `Cannot place "${event.title}" here — it falls inside an unavailable zone.`
+      return {
+        blocked: true,
+        message,
+      }
+    }
+
+    return { blocked: false }
+  }
+
+  async addEvent(
+    event: TEvent,
+    options?: { dependsOn?: Array<EventDependency> },
+  ): Promise<SaveEventResult> {
+    const dependsOn = options?.dependsOn
+    const startStr = event.start as string
+    const endStr = event.end as string
+
+    const startDateStr = startStr.slice(0, 10)
+    const endDate = Temporal.PlainDate.from(endStr.slice(0, 10)).add({
+      days: 1,
+    })
+    const endDateStr = endDate.toString({ calendarName: 'never' })
+
+    await this.fetchEventsForRange(startDateStr, endDateStr)
+
+    if (dependsOn && dependsOn.length > 0) {
+      const depValidation = this.validateEventDependencies(
+        { id: event.id, title: event.title, start: startStr, end: endStr },
+        dependsOn,
+      )
+      if (!depValidation.valid && depValidation.error) {
+        return { success: false, error: depValidation.error }
+      }
+    }
+
+    const placementValidation = this.validateEventPlacement({
+      id: event.id,
+      title: event.title,
+      start: startStr,
+      end: endStr,
+      resources: event.resources,
+      consumption: event.consumption,
+    })
+    if (placementValidation.blocked) {
+      return {
+        success: false,
+        error: {
+          eventId: event.id,
+          eventTitle: event.title,
+          reason: 'blocked',
+          message:
+            placementValidation.message ??
+            `Cannot place "${event.title}" here.`,
+          originalStart: startStr,
+          originalEnd: endStr,
+        },
+      }
+    }
+
+    this.commitAdd(event)
+    return { success: true }
+  }
+
+  async editEvent(
+    eventId: string,
+    updates: Partial<Omit<TEvent, 'id'>>,
+    options?: { dependsOn?: Array<EventDependency> },
+  ): Promise<SaveEventResult> {
+    const dependsOn = options?.dependsOn
+    const existingEvent = this._eventMap.get(eventId)
+    if (!existingEvent) {
+      return {
+        success: false,
+        error: {
+          eventId,
+          eventTitle: '',
+          reason: 'blocked',
+          message: `Event "${eventId}" not found.`,
+          originalStart: '',
+          originalEnd: '',
+        },
+      }
+    }
+
+    const effectiveStart =
+      (updates.start as string | undefined) ?? (existingEvent.start as string)
+    const effectiveEnd =
+      (updates.end as string | undefined) ?? (existingEvent.end as string)
+
+    const oldStartDateStr = (existingEvent.start as string).slice(0, 10)
+    const newStartDateStr = effectiveStart.slice(0, 10)
+    const rangeStart =
+      oldStartDateStr < newStartDateStr ? oldStartDateStr : newStartDateStr
+
+    const oldEndDate = Temporal.PlainDate.from(
+      (existingEvent.end as string).slice(0, 10),
+    ).add({ days: 1 })
+    const newEndDate = Temporal.PlainDate.from(effectiveEnd.slice(0, 10)).add({
+      days: 1,
+    })
+    const rangeEndPlain =
+      Temporal.PlainDate.compare(oldEndDate, newEndDate) > 0
+        ? oldEndDate
+        : newEndDate
+    const rangeEnd = rangeEndPlain.toString({ calendarName: 'never' })
+
+    await this.fetchEventsForRange(rangeStart, rangeEnd)
+
+    if (dependsOn && dependsOn.length > 0) {
+      const depValidation = this.validateEventDependencies(
+        {
+          id: eventId,
+          title: (updates.title as string | undefined) ?? existingEvent.title,
+          start: effectiveStart,
+          end: effectiveEnd,
+        },
+        dependsOn,
+      )
+      if (!depValidation.valid && depValidation.error) {
+        return { success: false, error: depValidation.error }
+      }
+    }
+
+    const startChanged = updates.start !== undefined
+    const endChanged = updates.end !== undefined
+    const resourcesChanged = updates.resources !== undefined
+    const consumptionChanged = updates.consumption !== undefined
+
+    if (startChanged || endChanged || resourcesChanged || consumptionChanged) {
+      const resources = updates.resources ?? existingEvent.resources
+      const consumption = updates.consumption ?? existingEvent.consumption
+      const moveValidation = this.validateMove(
+        eventId,
+        effectiveStart,
+        effectiveEnd,
+        resources,
+        consumption,
+      )
+      if (moveValidation.blocked) {
+        return {
+          success: false,
+          error: {
+            eventId,
+            eventTitle: moveValidation.blockedEventTitle ?? existingEvent.title,
+            reason: 'blocked',
+            message:
+              moveValidation.message ??
+              `Cannot move "${existingEvent.title}" to this position.`,
+            originalStart: existingEvent.start as string,
+            originalEnd: existingEvent.end as string,
+            attemptedStart: effectiveStart,
+            attemptedEnd: effectiveEnd,
+          },
+        }
+      }
+    }
+
+    this.commitUpdate(eventId, updates)
+    return { success: true }
+  }
+
+  async editRecurringEvent(
+    eventId: string,
+    updates: Partial<Omit<TEvent, 'id'>>,
+    options: {
+      scope: RecurrenceEditScope
+      occurrenceStart?: EventDateTimeInput
+      dependsOn?: Array<EventDependency>
+    },
+  ): Promise<SaveEventResult> {
+    const master = this._resolveMasterEvent(eventId)
+    if (!master) {
+      return {
+        success: false,
+        error: {
+          eventId,
+          eventTitle: '',
+          reason: 'blocked',
+          message: `Event "${eventId}" not found.`,
+          originalStart: '',
+          originalEnd: '',
+        },
+      }
+    }
+
+    if (!master.recurrence || options.scope === 'all') {
+      return this.editEvent(master.id, updates, {
+        dependsOn: options.dependsOn,
+      })
+    }
+
+    const occurrenceStart = this._resolveOccurrenceStart(
+      master,
+      options.occurrenceStart,
+    )
+    const occurrence = this._getRecurringOccurrence(master, occurrenceStart)
+    if (!occurrence) {
+      return {
+        success: false,
+        error: {
+          eventId,
+          eventTitle: master.title,
+          reason: 'blocked',
+          message: `Occurrence "${occurrenceStart}" not found.`,
+          originalStart: occurrenceStart,
+          originalEnd: occurrenceStart,
+        },
+      }
+    }
+
+    const occurrenceStartStr = toPlainDateTimeString(occurrence.start)
+    const occurrenceEndStr = toPlainDateTimeString(occurrence.end)
+    const effectiveStart =
+      updates.start != null
+        ? toPlainDateTimeString(updates.start)
+        : occurrenceStartStr
+    const effectiveEnd =
+      updates.end != null
+        ? toPlainDateTimeString(updates.end)
+        : updates.start != null
+          ? this._durationPreservingEnd(
+              occurrenceStartStr,
+              occurrenceEndStr,
+              effectiveStart,
+            )
+          : occurrenceEndStr
+
+    const oldStartDateStr = occurrenceStartStr.slice(0, 10)
+    const newStartDateStr = effectiveStart.slice(0, 10)
+    const rangeStart =
+      oldStartDateStr < newStartDateStr ? oldStartDateStr : newStartDateStr
+    const oldEndDate = Temporal.PlainDate.from(
+      occurrenceEndStr.slice(0, 10),
+    ).add({ days: 1 })
+    const newEndDate = Temporal.PlainDate.from(effectiveEnd.slice(0, 10)).add({
+      days: 1,
+    })
+    const rangeEndPlain =
+      Temporal.PlainDate.compare(oldEndDate, newEndDate) > 0
+        ? oldEndDate
+        : newEndDate
+    await this.fetchEventsForRange(
+      rangeStart,
+      rangeEndPlain.toString({ calendarName: 'never' }),
+    )
+
+    if (options.dependsOn && options.dependsOn.length > 0) {
+      const depValidation = this.validateEventDependencies(
+        {
+          id: occurrence.id,
+          title: (updates.title as string | undefined) ?? occurrence.title,
+          start: effectiveStart,
+          end: effectiveEnd,
+        },
+        options.dependsOn,
+      )
+      if (!depValidation.valid && depValidation.error) {
+        return { success: false, error: depValidation.error }
+      }
+    }
+
+    const startChanged = updates.start !== undefined
+    const endChanged = updates.end !== undefined
+    const resourcesChanged = updates.resources !== undefined
+    const consumptionChanged = updates.consumption !== undefined
+
+    if (startChanged || endChanged || resourcesChanged || consumptionChanged) {
+      const placementValidation = this.validateEventPlacement({
+        id: occurrence.id,
+        title: (updates.title as string | undefined) ?? occurrence.title,
+        start: effectiveStart,
+        end: effectiveEnd,
+        resources: updates.resources ?? occurrence.resources,
+        consumption: updates.consumption ?? occurrence.consumption,
+      })
+      if (placementValidation.blocked) {
+        return {
+          success: false,
+          error: {
+            eventId,
+            eventTitle: occurrence.title,
+            reason: 'blocked',
+            message:
+              placementValidation.message ??
+              `Cannot move "${occurrence.title}" to this position.`,
+            originalStart: occurrenceStartStr,
+            originalEnd: occurrenceEndStr,
+            attemptedStart: effectiveStart,
+            attemptedEnd: effectiveEnd,
+          },
+        }
+      }
+    }
+
+    const rule = this._normalizeRecurrenceDateTimeInputs(master.recurrence)
+    const recurrenceUpdate = (updates as { recurrence?: TEvent['recurrence'] })
+      .recurrence
+    const normalizedUpdates = {
+      ...updates,
+      ...(updates.start != null ? { start: effectiveStart } : {}),
+      ...(updates.end != null || updates.start != null
+        ? { end: effectiveEnd }
+        : {}),
+      ...(recurrenceUpdate != null
+        ? {
+            recurrence:
+              this._normalizeRecurrenceDateTimeInputs(recurrenceUpdate),
+          }
+        : {}),
+    } as Partial<Omit<TEvent, 'id'>>
+
+    if (options.scope === 'this') {
+      const exDates = (rule.exDates ?? []).filter(
+        (value) =>
+          !this._recurrenceInputMatchesOccurrence(value, occurrenceStart),
+      )
+      const overrides = (rule.overrides ?? []).filter(
+        (override) =>
+          !this._recurrenceInputMatchesOccurrence(
+            override.originalStart,
+            occurrenceStart,
+          ),
+      )
+      const overrideFields = {
+        ...(normalizedUpdates as Record<string, unknown>),
+      }
+      delete overrideFields.recurrence
+      delete overrideFields._originalStart
+      delete overrideFields._originalEnd
+      delete overrideFields._recurringMasterId
+      delete overrideFields._occurrenceIndex
+      delete overrideFields._occurrenceOriginalStart
+
+      overrides.push({
+        ...overrideFields,
+        originalStart: occurrenceStart,
+        ...(updates.start != null ? { start: effectiveStart } : {}),
+        ...(updates.end != null || updates.start != null
+          ? { end: effectiveEnd }
+          : {}),
+      })
+
+      const nextMaster = {
+        ...master,
+        recurrence: this._normalizeRecurrenceDateTimeInputs({
+          ...rule,
+          exDates,
+          overrides,
+        }),
+      } as TEvent
+
+      this._commitRecurringUpdate(master, nextMaster, [], {
+        type: 'updated',
+        eventId: occurrence.id,
+        eventTitle: (updates.title as string | undefined) ?? occurrence.title,
+        start: effectiveStart,
+        end: effectiveEnd,
+        updates: normalizedUpdates as Record<string, unknown>,
+      })
+      return { success: true }
+    }
+
+    const masterStart = toPlainDateTimeString(master.start)
+    if (occurrenceStart === masterStart) {
+      return this.editEvent(master.id, updates, {
+        dependsOn: options.dependsOn,
+      })
+    }
+
+    const splitDate = occurrenceStart.split('T')[0]!
+    const oldRule = this._normalizeRecurrenceDateTimeInputs({
+      ...rule,
+      until: splitDate,
+    })
+    const remainingRule = this._normalizeRecurrenceDateTimeInputs({
+      ...rule,
+      ...(rule.count !== undefined && rule.until === undefined
+        ? {
+            count: Math.max(1, rule.count - (occurrence._occurrenceIndex ?? 0)),
+          }
+        : {}),
+      exDates: rule.exDates?.filter(
+        (value) =>
+          this._compareRecurrenceInputToOccurrence(value, occurrenceStart) > 0,
+      ),
+      overrides: rule.overrides?.filter(
+        (override) =>
+          this._compareRecurrenceInputToOccurrence(
+            override.originalStart,
+            occurrenceStart,
+          ) > 0,
+      ),
+    })
+
+    const updateFields = { ...(normalizedUpdates as Record<string, unknown>) }
+    delete updateFields.recurrence
+
+    const splitEvent = {
+      ...occurrence,
+      ...updateFields,
+      id: this._makeSplitRecurringEventId(master, occurrenceStart),
+      start: effectiveStart,
+      end: effectiveEnd,
+      recurrence:
+        recurrenceUpdate != null
+          ? this._normalizeRecurrenceDateTimeInputs(recurrenceUpdate)
+          : remainingRule,
+      _originalStart: undefined,
+      _originalEnd: undefined,
+      _recurringMasterId: undefined,
+      _occurrenceIndex: undefined,
+      _occurrenceOriginalStart: undefined,
+    } as TEvent
+
+    const nextMaster = {
+      ...master,
+      recurrence: oldRule,
+    } as TEvent
+
+    this._commitRecurringUpdate(master, nextMaster, [splitEvent], {
+      type: 'updated',
+      eventId: splitEvent.id,
+      eventTitle: splitEvent.title,
+      start: splitEvent.start as string,
+      end: splitEvent.end as string,
+      updates: normalizedUpdates as Record<string, unknown>,
+    })
+
+    return { success: true }
+  }
+
+  removeRecurringEvent(
+    eventId: string,
+    options: {
+      scope: RecurrenceEditScope
+      occurrenceStart?: EventDateTimeInput
+    },
+  ) {
+    const master = this._resolveMasterEvent(eventId)
+    if (!master) return
+
+    if (!master.recurrence || options.scope === 'all') {
+      this.removeEvent(master.id)
+      return
+    }
+
+    const occurrenceStart = this._resolveOccurrenceStart(
+      master,
+      options.occurrenceStart,
+    )
+    const occurrence = this._getRecurringOccurrence(master, occurrenceStart)
+    if (!occurrence) return
+
+    const rule = this._normalizeRecurrenceDateTimeInputs(master.recurrence)
+    const occurrenceStartStr = toPlainDateTimeString(occurrence.start)
+    const occurrenceEndStr = toPlainDateTimeString(occurrence.end)
+
+    if (options.scope === 'this') {
+      const exDates = (rule.exDates ?? []).filter(
+        (value) =>
+          !this._recurrenceInputMatchesOccurrence(value, occurrenceStart),
+      )
+      exDates.push(occurrenceStart)
+      const overrides = (rule.overrides ?? []).filter(
+        (override) =>
+          !this._recurrenceInputMatchesOccurrence(
+            override.originalStart,
+            occurrenceStart,
+          ),
+      )
+      const nextMaster = {
+        ...master,
+        recurrence: this._normalizeRecurrenceDateTimeInputs({
+          ...rule,
+          exDates,
+          overrides,
+        }),
+      } as TEvent
+      this._commitRecurringUpdate(master, nextMaster, [], {
+        type: 'removed',
+        eventId: occurrence.id,
+        eventTitle: occurrence.title,
+        start: occurrenceStartStr,
+        end: occurrenceEndStr,
+      })
+      return
+    }
+
+    if (occurrenceStart === toPlainDateTimeString(master.start)) {
+      this.removeEvent(master.id)
+      return
+    }
+
+    const nextMaster = {
+      ...master,
+      recurrence: this._normalizeRecurrenceDateTimeInputs({
+        ...rule,
+        until: occurrenceStart.split('T')[0]!,
+      }),
+    } as TEvent
+
+    this._commitRecurringUpdate(master, nextMaster, [], {
+      type: 'removed',
+      eventId: occurrence.id,
+      eventTitle: occurrence.title,
+      start: occurrenceStartStr,
+      end: occurrenceEndStr,
+    })
+  }
+
+  createDependency(
+    sourceId: string,
+    targetId: string,
+    type: DependencyType = 'FS',
+  ): { blocked: boolean; error?: ResizeError } {
+    const sourceEvent = this._eventMap.get(sourceId)
+    const targetEvent = this._eventMap.get(targetId)
+    if (!sourceEvent || !targetEvent) return { blocked: false }
+
+    const currentDeps = targetEvent.dependsOn ?? []
+    if (currentDeps.some((d) => d.id === sourceId && d.type === type)) {
+      return { blocked: false }
+    }
+
+    if (sourceId === targetId) {
+      return {
+        blocked: true,
+        error: {
+          eventId: targetId,
+          eventTitle: targetEvent.title,
+          reason: 'blocked',
+          message: 'circular dependency: an event cannot depend on itself',
+          originalStart: toPlainDateTimeString(targetEvent.start),
+          originalEnd: toPlainDateTimeString(targetEvent.end),
+        },
+      }
+    }
+
+    const visited = new Set<string>()
+    const stack = [sourceId]
+    while (stack.length > 0) {
+      const currentId = stack.pop()!
+      if (currentId === targetId) {
+        return {
+          blocked: true,
+          error: {
+            eventId: targetId,
+            eventTitle: targetEvent.title,
+            reason: 'blocked',
+            message: `circular dependency: ${sourceId} already depends on ${targetId} (directly or indirectly)`,
+            originalStart: toPlainDateTimeString(targetEvent.start),
+            originalEnd: toPlainDateTimeString(targetEvent.end),
+          },
+        }
+      }
+      if (visited.has(currentId)) continue
+      visited.add(currentId)
+      const currentEvent = this._eventMap.get(currentId)
+      if (currentEvent) {
+        for (const dep of currentEvent.dependsOn ?? []) {
+          stack.push(dep.id)
+        }
+      }
+    }
+
+    const tz = this.options.timeZone
+    const sourceStartStr = toPlainDateTimeString(sourceEvent.start)
+    const sourceEndStr = toPlainDateTimeString(sourceEvent.end)
+    const targetStartStr = toPlainDateTimeString(targetEvent.start)
+    const targetEndStr = toPlainDateTimeString(targetEvent.end)
+
+    const sStartMs =
+      Temporal.PlainDateTime.from(sourceStartStr).toZonedDateTime(
+        tz,
+      ).epochMilliseconds
+    const sEndMs =
+      Temporal.PlainDateTime.from(sourceEndStr).toZonedDateTime(
+        tz,
+      ).epochMilliseconds
+    const tStartMs =
+      Temporal.PlainDateTime.from(targetStartStr).toZonedDateTime(
+        tz,
+      ).epochMilliseconds
+    const tEndMs =
+      Temporal.PlainDateTime.from(targetEndStr).toZonedDateTime(
+        tz,
+      ).epochMilliseconds
+
+    const shiftMs = requiredForwardShiftMs(
+      type,
+      sStartMs,
+      sEndMs,
+      tStartMs,
+      tEndMs,
+    )
+    const needsReschedule = shiftMs > 0
+
+    let newTargetStart = targetStartStr
+    let newTargetEnd = targetEndStr
+
+    if (needsReschedule) {
+      newTargetStart = Temporal.PlainDateTime.from(targetStartStr)
+        .add({ milliseconds: shiftMs })
+        .toString({ smallestUnit: 'second' })
+      newTargetEnd = Temporal.PlainDateTime.from(targetEndStr)
+        .add({ milliseconds: shiftMs })
+        .toString({ smallestUnit: 'second' })
+
+      const validation = this.validateMove(
+        targetId,
+        newTargetStart,
+        newTargetEnd,
+      )
+      if (validation.blocked) {
+        return {
+          blocked: true,
+          error: {
+            eventId: targetId,
+            eventTitle: validation.blockedEventTitle ?? targetEvent.title,
+            reason: 'unavailable-time',
+            message:
+              validation.message ??
+              `Cannot connect (${type}): the resulting schedule would fall in unavailable time.`,
+            originalStart: targetStartStr,
+            originalEnd: targetEndStr,
+            attemptedStart: newTargetStart,
+            attemptedEnd: newTargetEnd,
+          },
+        }
+      }
+    }
+
+    this.commitUpdate(targetId, {
+      dependsOn: [...currentDeps, { id: sourceId, type }],
+      ...(needsReschedule && { start: newTargetStart, end: newTargetEnd }),
+    } as Partial<Omit<TEvent, 'id'>>)
+
+    return { blocked: false }
+  }
+
+  removeEvent(id: Event['id']) {
+    if (!this.options.events) return
+
+    const removedEvent = this._eventMap.get(id)
+    if (!removedEvent) return
+
+    const index = this.options.events.indexOf(removedEvent)
+    if (index === -1) return
+
+    this._undoStack.push(this._snapshotEvents())
+    this._redoStack = []
+
+    this.options.events.splice(index, 1)
+    this._indexRemoveEvent(removedEvent)
+    this.store.setState((prev) => ({
+      ...prev,
+      eventsVersion: prev.eventsVersion + 1,
+    }))
+
+    getTimeClient().emit('event:removed', {
+      eventId: id,
+      eventTitle: removedEvent.title,
+      start: removedEvent.start as string,
+      end: removedEvent.end as string,
+    })
+  }
+
+  getUnavailableRanges(
+    date: string,
+    options?: {
+      containerHeight?: number
+      resourceIds?: Array<TResource['id']>
+    },
+  ): Array<UnavailableRange> {
+    const containerHeight = options?.containerHeight ?? 1440
+    const merged = this._getMergedUnavailableMinuteRanges(
+      date,
+      options?.resourceIds,
+    )
+    if (merged === null) return []
+
+    const dayEndMinutes = MINUTES_IN_DAY
+    const scale = containerHeight / dayEndMinutes
+
+    return merged.map((range) => ({
+      top: range.startMinutes * scale,
+      height: (range.endMinutes - range.startMinutes) * scale,
+      startTime: formatMinutesToTime(range.startMinutes),
+      endTime: formatMinutesToTime(range.endMinutes),
+    }))
+  }
+
+  private _getMergedUnavailableMinuteRanges(
+    date: string,
+    resourceIds?: Array<TResource['id']>,
+  ): Array<{ startMinutes: number; endMinutes: number }> | null {
+    const allResources = this.options.resources
+    if (!allResources || allResources.length === 0) return null
+
+    const resources = resourceIds
+      ? allResources.filter((r) => resourceIds.includes(r.id))
+      : allResources
+    if (resources.length === 0) return null
+
+    const sortedIds = resources
+      .map((r) => r.id)
+      .slice()
+      .sort()
+      .join(',')
+    const cacheKey = `${sortedIds}|${date}`
+    const cached = this._mergedUnavailMinuteCache.get(cacheKey)
+    if (cached) return cached
+
+    const weekday = this._getWeekday(date)
+
+    const availableRanges: Array<{ startMinutes: number; endMinutes: number }> =
+      []
+    for (const resource of resources) {
+      if (!resource.availability) continue
+      const info = this._getResourceDayAvail(resource, weekday)
+      for (const a of info.available) availableRanges.push(a)
+    }
+
+    if (availableRanges.length === 0) {
+      const fullDay = [{ startMinutes: 0, endMinutes: MINUTES_IN_DAY }]
+      this._mergedUnavailMinuteCache.set(cacheKey, fullDay)
+      return fullDay
+    }
+
+    availableRanges.sort((a, b) => a.startMinutes - b.startMinutes)
+    const mergedAvail: Array<{ startMinutes: number; endMinutes: number }> = []
+    for (const range of availableRanges) {
+      const last = mergedAvail[mergedAvail.length - 1]
+      if (last && range.startMinutes <= last.endMinutes) {
+        last.endMinutes = Math.max(last.endMinutes, range.endMinutes)
+      } else {
+        mergedAvail.push({ ...range })
+      }
+    }
+
+    const unavailable: Array<{ startMinutes: number; endMinutes: number }> = []
+    let cursor = 0
+    for (const a of mergedAvail) {
+      if (cursor < a.startMinutes) {
+        unavailable.push({ startMinutes: cursor, endMinutes: a.startMinutes })
+      }
+      cursor = a.endMinutes
+    }
+    if (cursor < MINUTES_IN_DAY) {
+      unavailable.push({ startMinutes: cursor, endMinutes: MINUTES_IN_DAY })
+    }
+
+    this._mergedUnavailMinuteCache.set(cacheKey, unavailable)
+    return unavailable
+  }
+
+  getUnavailabilityDetails(
+    date: string,
+    startMinutes: number,
+    endMinutes: number,
+    options?: {
+      resourceIds?: Array<TResource['id']>
+    },
+  ): Array<{
+    resourceId: string
+    resourceLabel: string
+    reason: 'outside-hours' | 'capacity' | 'no-availability'
+    description: string
+  }> {
+    const resources = options?.resourceIds
+      ? this.options.resources?.filter((resource) =>
+          options.resourceIds?.includes(resource.id),
+        )
+      : this.options.resources
+
+    if (!resources || resources.length === 0) {
+      return []
+    }
+
+    const weekday = this._getWeekday(date)
+
+    const details: Array<{
+      resourceId: string
+      resourceLabel: string
+      reason: 'outside-hours' | 'capacity' | 'no-availability'
+      description: string
+    }> = []
+
+    for (const resource of resources) {
+      if (!resource.availability || resource.availability.length === 0) {
+        details.push({
+          resourceId: resource.id,
+          resourceLabel: resource.label,
+          reason: 'no-availability',
+          description: `${resource.label}: No availability configured`,
+        })
+        continue
+      }
+
+      const info = this._getResourceDayAvail(resource, weekday)
+      const availableSlots = info.slotsForWeekday
+
+      if (availableSlots.length === 0) {
+        details.push({
+          resourceId: resource.id,
+          resourceLabel: resource.label,
+          reason: 'outside-hours',
+          description: `${resource.label}: Not available on this day`,
+        })
+        continue
+      }
+
+      let isWithinAvailability = false
+      for (const slot of availableSlots) {
+        if (
+          startMinutes >= slot.startMinutes &&
+          endMinutes <= slot.endMinutes
+        ) {
+          isWithinAvailability = true
+          break
+        }
+      }
+
+      if (!isWithinAvailability) {
+        let availabilityWindow = ''
+        for (let i = 0; i < availableSlots.length; i++) {
+          const r = availableSlots[i]!
+          if (i > 0) availabilityWindow += ', '
+          availabilityWindow += `${formatMinutesToTime(r.startMinutes)}-${formatMinutesToTime(r.endMinutes)}`
+        }
+
+        details.push({
+          resourceId: resource.id,
+          resourceLabel: resource.label,
+          reason: 'outside-hours',
+          description: `${resource.label}: Available ${availabilityWindow}, but event is ${formatMinutesToTime(startMinutes)}-${formatMinutesToTime(endMinutes)}`,
+        })
+      }
+    }
+
+    return details
+  }
+
+  private getMergedEventsByResource(
+    days: Array<Day<TResource, TEvent>>,
+  ): Map<TResource['id'], Array<TEvent>> {
+    const map = new Map<TResource['id'], Array<TEvent>>()
+    this.options.resources?.forEach((r) => map.set(r.id, []))
+
+    const allSegments = days.flatMap((d) => d.events)
+    const merged = new Map<string, TEvent>()
+    for (const segment of allSegments) {
+      if (!merged.has(segment.id)) {
+        merged.set(segment.id, {
+          ...segment,
+          start: segment._originalStart ?? segment.start,
+          end: segment._originalEnd ?? segment.end,
+        } as TEvent)
+      }
+    }
+
+    for (const event of merged.values()) {
+      const resourceIds = this._getEventResourceIds(event)
+      for (const rid of resourceIds) {
+        map.get(rid)?.push(event)
+      }
+    }
+
+    return map
+  }
+
+  getEventsByResource(): Map<TResource['id'], Array<TEvent>> {
+    return this.getMergedEventsByResource(this.getDaysWithEvents())
+  }
+
+  getTimelineLayout(): TimelineLayout<TResource, TEvent> {
+    const days = this.getDaysWithEvents()
+
+    if (days.length === 0) {
+      return { rows: [], currentTimePosition: null }
+    }
+
+    const firstDay = days[0]!.date
+    const totalDays = days.length
+    const eventsByResource = this.getMergedEventsByResource(days)
+
+    const rows: Array<TimelineResourceRow<TResource, TEvent>> = (
+      this.options.resources ?? []
+    ).map((resource) => {
+      const resourceEvents = eventsByResource.get(resource.id) ?? []
+
+      const positioned = resourceEvents
+        .map((event) => {
+          const pos = this.computeTimelineEventPosition(
+            event,
+            firstDay,
+            totalDays,
+          )
+          if (pos.width <= 0) return null
+          return { event, ...pos, right: pos.left + pos.width }
+        })
+        .filter((v): v is NonNullable<typeof v> => v !== null)
+
+      const lanes: Array<Array<{ left: number; right: number }>> = []
+      const withLanes = positioned.map((item) => {
+        let assignedLane = 0
+        for (assignedLane = 0; assignedLane < lanes.length; assignedLane++) {
+          const hasOverlap = lanes[assignedLane]!.some(
+            (existing) =>
+              item.left < existing.right && item.right > existing.left,
+          )
+          if (!hasOverlap) break
+        }
+        if (!lanes[assignedLane]) lanes[assignedLane] = []
+        lanes[assignedLane]!.push({ left: item.left, right: item.right })
+        return {
+          event: item.event,
+          left: item.left,
+          width: item.width,
+          lane: assignedLane,
+          isStartClipped: item.isStartClipped,
+          isEndClipped: item.isEndClipped,
+        }
+      })
+
+      return {
+        resource,
+        events: withLanes,
+        laneCount: Math.max(1, lanes.length),
+      }
+    })
+
+    let currentTimePosition: number | null = null
+    const now = Temporal.Now.zonedDateTimeISO(this.options.timeZone)
+    const todayStr = now.toPlainDate().toString({ calendarName: 'never' })
+    const todayIndex = days.findIndex(
+      (d) => d.date.toString({ calendarName: 'never' }) === todayStr,
+    )
+    if (todayIndex >= 0) {
+      const hourFraction = now.hour + now.minute / 60
+      const totalHours = totalDays * 24
+      currentTimePosition =
+        ((todayIndex * 24 + hourFraction) / totalHours) * 100
+    }
+
+    return { rows, currentTimePosition }
+  }
+
+  private computeTimelineEventPosition(
+    event: TEvent,
+    firstDay: Temporal.PlainDate,
+    totalDays: number,
+  ): {
+    left: number
+    width: number
+    isStartClipped: boolean
+    isEndClipped: boolean
+  } {
+    const startStr = toPlainDateTimeString(event.start)
+    const endStr = toPlainDateTimeString(event.end)
+
+    const startDateStr = startStr.split('T')[0]!
+    const endDateStr = endStr.split('T')[0]!
+    const startTimeStr = startStr.split('T')[1] ?? '00:00:00'
+    const endTimeStr = endStr.split('T')[1] ?? '00:00:00'
+
+    const startTimeParts = startTimeStr.split(':').map(Number)
+    const endTimeParts = endTimeStr.split(':').map(Number)
+
+    const firstDayIso = firstDay.toString({ calendarName: 'never' })
+    const startDayOffset = Temporal.PlainDate.from(firstDayIso).until(
+      Temporal.PlainDate.from(startDateStr),
+    ).days
+    const endDayOffset = Temporal.PlainDate.from(firstDayIso).until(
+      Temporal.PlainDate.from(endDateStr),
+    ).days
+
+    const startHours =
+      startDayOffset * 24 +
+      (startTimeParts[0] ?? 0) +
+      (startTimeParts[1] ?? 0) / 60
+    const endHours =
+      endDayOffset * 24 + (endTimeParts[0] ?? 0) + (endTimeParts[1] ?? 0) / 60
+
+    const totalHours = totalDays * 24
+
+    const rawLeft = (startHours / totalHours) * 100
+    const rawRight = (endHours / totalHours) * 100
+
+    const left = Math.max(0, rawLeft)
+    const right = Math.min(100, rawRight)
+
+    return {
+      left,
+      width: right - left,
+      isStartClipped: rawLeft < 0,
+      isEndClipped: rawRight > 100,
+    }
+  }
+
+  private getUnavailableMinuteRanges(
+    date: string,
+    options?: { resourceIds?: Array<string> },
+  ): Array<UnavailableTimeRange> {
+    const merged = this._getMergedUnavailableMinuteRanges(
+      date,
+      options?.resourceIds,
+    )
+    if (!merged) return []
+    return merged.map((r) => ({
+      startMinutes: r.startMinutes,
+      endMinutes: r.endMinutes,
+    }))
+  }
+
+  private getResizeConflicts(
+    dayDate: string,
+    startMins: number,
+    endMins: number,
+    eventId: string,
+    resourceIds: Array<string>,
+    resizeEvent?: TEvent,
+  ): Array<AvailabilityConflict> {
+    const conflicts: Array<AvailabilityConflict> = []
+
+    const details = this.getUnavailabilityDetails(dayDate, startMins, endMins, {
+      resourceIds,
+    })
+
+    const unavailableRangesForDay = this.getUnavailableMinuteRanges(dayDate, {
+      resourceIds,
+    })
+
+    const weekday = this._getWeekday(dayDate)
+
+    for (const range of unavailableRangesForDay) {
+      if (startMins < range.endMinutes && endMins > range.startMinutes) {
+        const overlappingDetails = details.filter((d) => {
+          const resource = this.options.resources?.find(
+            (r) => r.id === d.resourceId,
+          )
+          if (!resource) return false
+
+          const resourceAvailableSlots = this._getResourceDayAvail(
+            resource,
+            weekday,
+          ).slotsForWeekday
+
+          if (resourceAvailableSlots.length === 0) return true
+
+          return !resourceAvailableSlots.some(
+            (slot) =>
+              !(
+                range.endMinutes <= slot.startMinutes ||
+                range.startMinutes >= slot.endMinutes
+              ),
+          )
+        })
+
+        if (overlappingDetails.length > 0) {
+          conflicts.push({
+            date: dayDate,
+            conflictRange: {
+              start: formatMinutesToTime(
+                Math.max(startMins, range.startMinutes),
+              ),
+              end: formatMinutesToTime(Math.min(endMins, range.endMinutes)),
+            },
+            resourceIds: overlappingDetails.map((d) => d.resourceId),
+            resourceDetails: overlappingDetails.map((d) => ({
+              resourceId: d.resourceId,
+              resourceLabel: d.resourceLabel,
+              reason: d.reason,
+              description: d.description,
+            })),
+            description: overlappingDetails
+              .map((d) => d.description)
+              .join('; '),
+          })
+        }
+      }
+    }
+
+    const eventsOnDay = this.getEventsByDate(dayDate)
+
+    const selfEvent = resizeEvent ?? this._eventMap.get(eventId)
+    const ownConsumptionArr = selfEvent?.consumption ?? [1]
+    const ownConsumption = ownConsumptionArr.reduce((a, b) => a + b, 0)
+
+    for (const resourceId of resourceIds) {
+      const resource = this.options.resources?.find((r) => r.id === resourceId)
+      if (!resource || !resource.capacity || resource.capacity.length === 0)
+        continue
+
+      const overlappingEvents = eventsOnDay.filter((e) => {
+        if (e.id === eventId) return false
+
+        const eventResourceIds = this._getEventResourceIds(e)
+        if (!eventResourceIds.includes(resourceId)) return false
+
+        const eventStart = new Date(e.start)
+        const eventEnd = new Date(e.end)
+        const eventStartMins =
+          eventStart.getHours() * 60 + eventStart.getMinutes()
+        const eventEndMins = eventEnd.getHours() * 60 + eventEnd.getMinutes()
+
+        return startMins < eventEndMins && endMins > eventStartMins
+      })
+
+      const usedByOthers = overlappingEvents.reduce((acc, e) => {
+        const c = e.consumption ?? [1]
+        return acc + c.reduce((a, b) => a + b, 0)
+      }, 0)
+
+      const resourceCapacitySum = resource.capacity.reduce((a, b) => a + b, 0)
+      const totalUsage = usedByOthers + ownConsumption
+
+      if (totalUsage > resourceCapacitySum) {
+        conflicts.push({
+          date: dayDate,
+          conflictRange: {
+            start: formatMinutesToTime(startMins),
+            end: formatMinutesToTime(endMins),
+          },
+          resourceIds: [resourceId],
+          resourceDetails: [
+            {
+              resourceId: resource.id,
+              resourceLabel: resource.label,
+              reason: 'capacity',
+              description: `${resource.label}: Capacity exceeded (${totalUsage}/${resourceCapacitySum} units used)`,
+              capacityInfo: {
+                max: resourceCapacitySum,
+                used: totalUsage,
+                remaining: 0,
+              },
+            },
+          ],
+          description: `${resource.label}: Capacity exceeded (${totalUsage}/${resourceCapacitySum} units used)`,
+        })
+      }
+    }
+
+    return conflicts
+  }
+
+  validateResize(options: ValidateResizeOptions): ValidateResizeResult {
+    const {
+      eventId,
+      originalStart,
+      originalEnd,
+      edge,
+      totalDeltaMinutes,
+      targetDayDate,
+      originalDayDate,
+      constraints,
+    } = options
+
+    const occurrenceStart =
+      options.occurrenceStart != null
+        ? toPlainDateTimeString(options.occurrenceStart)
+        : undefined
+    const event = this._resolveResizeEvent(
+      eventId,
+      occurrenceStart,
+      originalStart,
+    )
+    const resourceIds = event ? this._getEventResourceIds(event) : undefined
+
+    const unavailableRanges = this.getUnavailableMinuteRanges(targetDayDate, {
+      resourceIds,
+    })
+
+    const originalStartDate = originalStart.split('T')[0] ?? ''
+    const originalEndDate = originalEnd.split('T')[0] ?? ''
+
+    const origStartHourMins =
+      ((originalStart.charCodeAt(11) - 48) * 10 +
+        (originalStart.charCodeAt(12) - 48)) *
+        60 +
+      (originalStart.charCodeAt(14) - 48) * 10 +
+      (originalStart.charCodeAt(15) - 48)
+    const origEndHourMins =
+      ((originalEnd.charCodeAt(11) - 48) * 10 +
+        (originalEnd.charCodeAt(12) - 48)) *
+        60 +
+      (originalEnd.charCodeAt(14) - 48) * 10 +
+      (originalEnd.charCodeAt(15) - 48)
+
+    const effectiveEdge =
+      edge === 'left' ? 'top' : edge === 'right' ? 'bottom' : edge
+
+    let shouldBlockResize = false
+    let blockReason: ResizeError['reason'] = 'blocked'
+    let blockMessage = 'Resize blocked'
+    const conflicts: Array<AvailabilityConflict> = []
+
+    const snapToMinutes = constraints?.snapToMinutes ?? 1
+    const snapMins = (minutes: number): number => {
+      if (snapToMinutes <= 1) return minutes
+      return Math.round(minutes / snapToMinutes) * snapToMinutes
+    }
+
+    if (effectiveEdge === 'top' && targetDayDate < originalStartDate) {
+      const rawStartMinutes = origStartHourMins + totalDeltaMinutes
+      const targetStartMinutes =
+        ((rawStartMinutes % MINUTES_IN_DAY) + MINUTES_IN_DAY) % MINUTES_IN_DAY
+      const snappedTargetStartMinutes = snapMins(targetStartMinutes)
+      const currentStartMinutes = origStartHourMins
+
+      if (resourceIds?.length) {
+        const unavailabilityDetails = this.getUnavailabilityDetails(
+          targetDayDate,
+          snappedTargetStartMinutes,
+          MINUTES_IN_DAY,
+          { resourceIds },
+        )
+
+        if (unavailabilityDetails.length > 0) {
+          shouldBlockResize = true
+          blockReason = 'unavailable-time'
+          const detailsText = unavailabilityDetails
+            .map((d) => `${d.resourceLabel} (${d.reason})`)
+            .join(', ')
+          blockMessage = `Unavailable: Event at ${formatMinutesToTime(snappedTargetStartMinutes)} conflicts with ${detailsText}`
+          conflicts.push({
+            date: targetDayDate,
+            conflictRange: {
+              start: formatMinutesToTime(snappedTargetStartMinutes),
+              end: formatMinutesToTime(MINUTES_IN_DAY),
+            },
+            resourceIds: unavailabilityDetails.map((d) => d.resourceId),
+            resourceDetails: unavailabilityDetails.map((d) => ({
+              resourceId: d.resourceId,
+              resourceLabel: d.resourceLabel,
+              reason: d.reason,
+              description: d.description,
+            })),
+            description: unavailabilityDetails
+              .map((d) => d.description)
+              .join('; '),
+          })
+        }
+      }
+
+      if (!shouldBlockResize && resourceIds?.length) {
+        const sourceUnavailabilityDetails = this.getUnavailabilityDetails(
+          originalStartDate,
+          0,
+          currentStartMinutes,
+          { resourceIds },
+        )
+
+        if (sourceUnavailabilityDetails.length > 0) {
+          shouldBlockResize = true
+          blockReason = 'unavailable-time'
+          const detailsText = sourceUnavailabilityDetails
+            .map((d) => `${d.resourceLabel} (${d.reason})`)
+            .join(', ')
+          blockMessage = `Cannot resize: Would need to pass through unavailable time on ${originalStartDate} - ${detailsText}`
+          conflicts.push({
+            date: originalStartDate,
+            conflictRange: {
+              start: formatMinutesToTime(0),
+              end: formatMinutesToTime(currentStartMinutes),
+            },
+            resourceIds: sourceUnavailabilityDetails.map((d) => d.resourceId),
+            resourceDetails: sourceUnavailabilityDetails.map((d) => ({
+              resourceId: d.resourceId,
+              resourceLabel: d.resourceLabel,
+              reason: d.reason,
+              description: d.description,
+            })),
+            description: sourceUnavailabilityDetails
+              .map((d) => d.description)
+              .join('; '),
+          })
+        }
+      }
+    } else if (effectiveEdge === 'bottom' && targetDayDate > originalEndDate) {
+      const rawEndMinutes = origEndHourMins + totalDeltaMinutes
+      const targetEndMinutes =
+        ((rawEndMinutes % MINUTES_IN_DAY) + MINUTES_IN_DAY) % MINUTES_IN_DAY
+      const snappedTargetEndMinutes = snapMins(targetEndMinutes)
+      const currentEndMinutes = origEndHourMins
+
+      if (resourceIds?.length) {
+        const unavailabilityDetails = this.getUnavailabilityDetails(
+          targetDayDate,
+          0,
+          snappedTargetEndMinutes,
+          { resourceIds },
+        )
+
+        if (unavailabilityDetails.length > 0) {
+          shouldBlockResize = true
+          blockReason = 'unavailable-time'
+          const detailsText = unavailabilityDetails
+            .map((d) => `${d.resourceLabel} (${d.reason})`)
+            .join(', ')
+          blockMessage = `Unavailable: Event ending at ${formatMinutesToTime(snappedTargetEndMinutes)} conflicts with ${detailsText}`
+          conflicts.push({
+            date: targetDayDate,
+            conflictRange: {
+              start: formatMinutesToTime(0),
+              end: formatMinutesToTime(snappedTargetEndMinutes),
+            },
+            resourceIds: unavailabilityDetails.map((d) => d.resourceId),
+            resourceDetails: unavailabilityDetails.map((d) => ({
+              resourceId: d.resourceId,
+              resourceLabel: d.resourceLabel,
+              reason: d.reason,
+              description: d.description,
+            })),
+            description: unavailabilityDetails
+              .map((d) => d.description)
+              .join('; '),
+          })
+        }
+      }
+
+      if (!shouldBlockResize && resourceIds?.length) {
+        const sourceUnavailabilityDetails = this.getUnavailabilityDetails(
+          originalEndDate,
+          currentEndMinutes,
+          MINUTES_IN_DAY,
+          { resourceIds },
+        )
+
+        if (sourceUnavailabilityDetails.length > 0) {
+          shouldBlockResize = true
+          blockReason = 'unavailable-time'
+          const detailsText = sourceUnavailabilityDetails
+            .map((d) => `${d.resourceLabel} (${d.reason})`)
+            .join(', ')
+          blockMessage = `Cannot resize: Would need to pass through unavailable time on ${originalEndDate} - ${detailsText}`
+          conflicts.push({
+            date: originalEndDate,
+            conflictRange: {
+              start: formatMinutesToTime(currentEndMinutes),
+              end: formatMinutesToTime(MINUTES_IN_DAY),
+            },
+            resourceIds: sourceUnavailabilityDetails.map((d) => d.resourceId),
+            resourceDetails: sourceUnavailabilityDetails.map((d) => ({
+              resourceId: d.resourceId,
+              resourceLabel: d.resourceLabel,
+              reason: d.reason,
+              description: d.description,
+            })),
+            description: sourceUnavailabilityDetails
+              .map((d) => d.description)
+              .join('; '),
+          })
+        }
+      }
+    }
+
+    if (
+      !shouldBlockResize &&
+      targetDayDate === originalStartDate &&
+      targetDayDate === originalEndDate
+    ) {
+      const rawStartMinutes =
+        origStartHourMins + (effectiveEdge === 'top' ? totalDeltaMinutes : 0)
+      const rawEndMinutes =
+        origEndHourMins + (effectiveEdge === 'bottom' ? totalDeltaMinutes : 0)
+
+      const snappedStartMinutes = snapMins(
+        ((rawStartMinutes % MINUTES_IN_DAY) + MINUTES_IN_DAY) % MINUTES_IN_DAY,
+      )
+      const snappedEndMinutes = snapMins(
+        ((rawEndMinutes % MINUTES_IN_DAY) + MINUTES_IN_DAY) % MINUTES_IN_DAY,
+      )
+
+      if (resourceIds?.length) {
+        const unavailabilityDetails = this.getUnavailabilityDetails(
+          targetDayDate,
+          snappedStartMinutes,
+          snappedEndMinutes,
+          { resourceIds },
+        )
+
+        if (unavailabilityDetails.length > 0) {
+          shouldBlockResize = true
+          blockReason = 'unavailable-time'
+          const detailsText = unavailabilityDetails
+            .map((d) => `${d.resourceLabel} (${d.reason})`)
+            .join(', ')
+          blockMessage = `Unavailable: Event at ${formatMinutesToTime(snappedStartMinutes)}-${formatMinutesToTime(snappedEndMinutes)} conflicts with ${detailsText}`
+          conflicts.push({
+            date: targetDayDate,
+            conflictRange: {
+              start: formatMinutesToTime(snappedStartMinutes),
+              end: formatMinutesToTime(snappedEndMinutes),
+            },
+            resourceIds: unavailabilityDetails.map((d) => d.resourceId),
+            resourceDetails: unavailabilityDetails.map((d) => ({
+              resourceId: d.resourceId,
+              resourceLabel: d.resourceLabel,
+              reason: d.reason,
+              description: d.description,
+            })),
+            description: unavailabilityDetails
+              .map((d) => d.description)
+              .join('; '),
+          })
+        }
+      }
+
+      if (!shouldBlockResize && resourceIds?.length) {
+        const detailedConflicts = this.getResizeConflicts(
+          targetDayDate,
+          snappedStartMinutes,
+          snappedEndMinutes,
+          eventId,
+          resourceIds,
+          event,
+        )
+
+        const capacityConflicts = detailedConflicts.filter((c) =>
+          c.resourceDetails.some((d) => d.reason === 'capacity'),
+        )
+
+        if (capacityConflicts.length > 0) {
+          shouldBlockResize = true
+          blockReason = 'unavailable-time'
+          const conflict = capacityConflicts[0]!
+          const detailsText = conflict.resourceDetails
+            .map((d) => `${d.resourceLabel} (${d.reason})`)
+            .join(', ')
+          blockMessage = `Unavailable: Event at ${formatMinutesToTime(snappedStartMinutes)}-${formatMinutesToTime(snappedEndMinutes)} conflicts with ${detailsText}`
+          conflicts.push(...capacityConflicts)
+        }
+      }
+    }
+
+    if (!shouldBlockResize && resourceIds?.length) {
+      const originalStartMs = new Date(originalStart).getTime()
+      const originalEndMs = new Date(originalEnd).getTime()
+      const snapMs = snapToMinutes * 60_000
+      const snappedDeltaMs =
+        Math.round((totalDeltaMinutes * 60_000) / snapMs) * snapMs
+
+      let checkFromMs: number | null = null
+      let checkToMs: number | null = null
+
+      if (effectiveEdge === 'bottom') {
+        const newEndMs = originalEndMs + snappedDeltaMs
+        if (newEndMs > originalEndMs) {
+          checkFromMs = originalEndMs
+          checkToMs = newEndMs
+        }
+      } else {
+        const newStartMs = originalStartMs + snappedDeltaMs
+        if (newStartMs < originalStartMs) {
+          checkFromMs = newStartMs
+          checkToMs = originalStartMs
+        }
+      }
+
+      if (checkFromMs !== null && checkToMs !== null) {
+        const dayMs = 24 * 60 * 60 * 1_000
+        const cursor = new Date(checkFromMs)
+        cursor.setHours(0, 0, 0, 0)
+
+        while (cursor.getTime() < checkToMs && !shouldBlockResize) {
+          const dayStr = toPlainDateString(cursor)
+          const dayStartMs = cursor.getTime()
+          const dayEndMs = dayStartMs + dayMs
+
+          const overlapStartMs = Math.max(checkFromMs, dayStartMs)
+          const overlapEndMs = Math.min(checkToMs, dayEndMs)
+
+          if (overlapStartMs < overlapEndMs) {
+            const overlapStartMins = Math.floor(
+              (overlapStartMs - dayStartMs) / 60_000,
+            )
+            const overlapEndMins = Math.ceil(
+              (overlapEndMs - dayStartMs) / 60_000,
+            )
+
+            const dayConflicts = this.getResizeConflicts(
+              dayStr,
+              overlapStartMins,
+              overlapEndMins,
+              eventId,
+              resourceIds,
+              event,
+            )
+
+            if (dayConflicts.length > 0) {
+              shouldBlockResize = true
+              blockReason = 'unavailable-time'
+              const conflict = dayConflicts[0]!
+              const detailsText = conflict.resourceDetails
+                .map((d) => `${d.resourceLabel} (${d.reason})`)
+                .join(', ')
+              blockMessage = `Unavailable: ${dayStr} ${formatMinutesToTime(overlapStartMins)}–${formatMinutesToTime(overlapEndMins)} conflicts with ${detailsText}`
+              conflicts.push(...dayConflicts)
+            }
+          }
+
+          cursor.setTime(cursor.getTime() + dayMs)
+        }
+      }
+    }
+
+    const snapMs = (constraints?.snapToMinutes ?? 1) * 60_000
+    const snappedDeltaMs =
+      Math.round((totalDeltaMinutes * 60_000) / snapMs) * snapMs
+
+    if (!shouldBlockResize && effectiveEdge === 'top' && this.options.events) {
+      const event = this.options.events.find((ev) => ev.id === eventId)
+      if (event?.dependsOn?.length) {
+        const proposedStartMs =
+          Temporal.PlainDateTime.from(originalStart).toZonedDateTime(
+            this.options.timeZone,
+          ).epochMilliseconds + snappedDeltaMs
+        const proposedEndMs = Temporal.PlainDateTime.from(
+          originalEnd,
+        ).toZonedDateTime(this.options.timeZone).epochMilliseconds
+
+        for (const dep of event.dependsOn) {
+          const pred = this.options.events.find((ev) => ev.id === dep.id)
+          if (!pred) continue
+
+          const predStartStr = toPlainDateTimeString(pred.start)
+          const predEndStr = toPlainDateTimeString(pred.end)
+          const predStartMs = Temporal.PlainDateTime.from(
+            predStartStr,
+          ).toZonedDateTime(this.options.timeZone).epochMilliseconds
+          const predEndMs = Temporal.PlainDateTime.from(
+            predEndStr,
+          ).toZonedDateTime(this.options.timeZone).epochMilliseconds
+
+          const shortfall = requiredForwardShiftMs(
+            dep.type,
+            predStartMs,
+            predEndMs,
+            proposedStartMs,
+            proposedEndMs,
+          )
+          if (shortfall > 0) {
+            shouldBlockResize = true
+            blockReason = 'blocked'
+            blockMessage = `"${event.title}" violates ${dep.type} dependency on "${pred.title}"`
+            break
+          }
+        }
+      }
+    }
+
+    if (
+      !shouldBlockResize &&
+      effectiveEdge === 'bottom' &&
+      snappedDeltaMs > 0
+    ) {
+      const affected = this.getAffectedByDelta(
+        eventId,
+        snappedDeltaMs,
+        new Set([eventId]),
+      )
+
+      for (const { event: affectedEvent, newStart, newEnd } of affected) {
+        const alreadyConflicting = this.checkEventAvailability(
+          affectedEvent,
+          toPlainDateTimeString(affectedEvent.start),
+          toPlainDateTimeString(affectedEvent.end),
+        )
+        if (alreadyConflicting) continue
+
+        const conflict = this.checkEventAvailability(
+          affectedEvent,
+          newStart,
+          newEnd,
+        )
+        if (conflict) {
+          shouldBlockResize = true
+          blockReason = 'unavailable-time'
+          blockMessage = `Blocked: "${affectedEvent.title}" would be pushed to unavailable time`
+          conflicts.push(conflict)
+          break
+        }
+      }
+    }
+
+    if (
+      !shouldBlockResize &&
+      resourceIds?.length &&
+      originalStartDate === originalEndDate
+    ) {
+      const selfEvent = event
+      if (selfEvent) {
+        const proposedNewStart =
+          effectiveEdge === 'top'
+            ? Temporal.PlainDateTime.from(originalStart)
+                .add({ milliseconds: snappedDeltaMs })
+                .toString({ smallestUnit: 'second' })
+            : originalStart
+        const proposedNewEnd =
+          effectiveEdge === 'bottom'
+            ? Temporal.PlainDateTime.from(originalEnd)
+                .add({ milliseconds: snappedDeltaMs })
+                .toString({ smallestUnit: 'second' })
+            : originalEnd
+
+        const spanConflict = this.checkEventAvailability(
+          selfEvent,
+          proposedNewStart,
+          proposedNewEnd,
+        )
+        if (spanConflict) {
+          shouldBlockResize = true
+          blockReason = 'unavailable-time'
+          blockMessage = spanConflict.description
+          const alreadyReported = conflicts.some(
+            (c) =>
+              c.date === spanConflict.date &&
+              c.conflictRange.start === spanConflict.conflictRange.start &&
+              c.conflictRange.end === spanConflict.conflictRange.end,
+          )
+          if (!alreadyReported) conflicts.push(spanConflict)
+        }
+      }
+    }
+
+    const effectiveDeltaMinutes = shouldBlockResize ? 0 : totalDeltaMinutes
+
+    const result = calculateResizedEvent({
+      originalStart,
+      originalEnd,
+      edge,
+      deltaMinutes: effectiveDeltaMinutes,
+      timeZone: this.options.timeZone,
+      constraints: {
+        ...constraints,
+        unavailableRanges: shouldBlockResize ? [] : unavailableRanges,
+      },
+    })
+
+    return {
+      blocked: shouldBlockResize,
+      error: shouldBlockResize
+        ? {
+            reason: blockReason,
+            message: blockMessage,
+            conflicts,
+          }
+        : undefined,
+      result,
+      targetDayDate: shouldBlockResize ? originalDayDate : targetDayDate,
+    }
+  }
+
+  /**
+   * Replaces the current resource list and invalidates availability caches.
+   */
+  setResources(resources: Array<TResource> | null) {
+    this.options.resources = resources
+    this._resourceDayAvailCache.clear()
+    this._mergedUnavailMinuteCache.clear()
+    // Recurring-event availability conflicts depend on resources, so the
+    // memoized event map must be invalidated.
+    this._bumpMapVersion()
+  }
+
+  /**
+   * Replaces the current event list and invalidates availability caches.
+   */
+  setEvents(events: Array<TEvent> | null) {
+    this.options.events = events?.map((e) => this.normalizeEvent(e)) || null
+    this._eventMap.clear()
+    this._dependentsMap.clear()
+    this._dateIndex.clear()
+    this._resourceDayAvailCache.clear()
+    this._mergedUnavailMinuteCache.clear()
+    // _indexAddEvent bumps the version per event, but an empty/null list adds
+    // nothing — bump explicitly so the memoized event map is invalidated.
+    this._bumpMapVersion()
+    this.options.events?.forEach((e) => this._indexAddEvent(e))
+  }
+}
+
+function requiredForwardShiftMs(
+  type: DependencyType,
+  predStartMs: number,
+  predEndMs: number,
+  succStartMs: number,
+  succEndMs: number,
+): number {
+  switch (type) {
+    case 'FS':
+      return predEndMs - succStartMs
+    case 'SS':
+      return predStartMs - succStartMs
+    case 'FF':
+      return predEndMs - succEndMs
+    case 'SF':
+      return predStartMs - succEndMs
+  }
+}
+
+function requiredBackwardShiftMs(
+  type: DependencyType,
+  predStartMs: number,
+  predEndMs: number,
+  succStartMs: number,
+  succEndMs: number,
+): number {
+  switch (type) {
+    case 'FS':
+      return predEndMs - succStartMs
+    case 'SS':
+      return predStartMs - succStartMs
+    case 'FF':
+      return predEndMs - succEndMs
+    case 'SF':
+      return predStartMs - succEndMs
+  }
+}
diff --git a/packages/time/src/calendar/date-core.ts b/packages/time/src/calendar/date-core.ts
new file mode 100644
index 00000000..a4dc8092
--- /dev/null
+++ b/packages/time/src/calendar/date-core.ts
@@ -0,0 +1,476 @@
+import { Store } from '@tanstack/store'
+import { Temporal } from '@js-temporal/polyfill'
+import {
+  constrainDateToRange,
+  getFirstDayOfMonth,
+  getFirstDayOfWeek,
+  isDateInRange,
+  parseDateRange,
+} from '../utils'
+import { getDateTimeDefaults } from '../utils/dateDefaults'
+import { buildDateFormatter } from '../formatter/buildDateFormatter'
+import { buildDateTimeFormatter } from '../formatter/buildDateTimeFormatter'
+import { buildTimeFormatter } from '../formatter/buildTimeFormatter'
+import { getTimeClient } from '../client'
+import { generateDateRange } from './generateDateRange'
+import type { ParsedDateRange } from '../utils/dateRange'
+import type { CalendarStore, DateRange, ViewMode } from './types'
+import type { DateInput } from '~/date'
+
+function toTemporalPlainDateString(date: DateInput): string {
+  if (date instanceof Temporal.PlainDate) {
+    return date.toString({ calendarName: 'never' })
+  }
+  if (date instanceof Temporal.ZonedDateTime) {
+    return date.toPlainDate().toString({ calendarName: 'never' })
+  }
+  if (date instanceof Date) {
+    return date.toISOString().split('T')[0]!
+  }
+  if (typeof date === 'number') {
+    return new Date(date).toISOString().split('T')[0]!
+  }
+  return date
+}
+
+function toDate(date: DateInput): Date {
+  if (date instanceof Date) {
+    return date
+  }
+  if (date instanceof Temporal.ZonedDateTime) {
+    return new Date(date.toPlainDate().toString({ calendarName: 'auto' }))
+  }
+  if (date instanceof Temporal.PlainDate) {
+    return new Date(date.year, date.month - 1, date.day)
+  }
+  return new Date(date)
+}
+
+/**
+ * Base options interface for date-related core classes.
+ */
+export interface DateCoreOptions {
+  /** The initial view mode configuration. */
+  viewMode: ViewMode
+  /** Optional locale for date formatting. Uses a BCP 47 language tag. */
+  locale?: Intl.UnicodeBCP47LocaleIdentifier
+  /** Optional time zone specification. */
+  timeZone?: Temporal.TimeZoneLike
+  /** Optional calendar system to be used. */
+  calendar?: Temporal.CalendarLike
+  /** Optional range of dates to be used. */
+  range?: DateRange
+  /** Optional date formatter. */
+  dateFormatter?: Intl.DateTimeFormat
+  /** Optional time formatter. */
+  timeFormatter?: Intl.DateTimeFormat
+  /** Optional date time formatter. */
+  dateTimeFormatter?: Intl.DateTimeFormat
+}
+
+export interface ParsedDateCoreOptions extends Omit<
+  Required<DateCoreOptions>,
+  'range' | 'dateFormatter' | 'timeFormatter' | 'dateTimeFormatter'
+> {
+  range: ParsedDateRange
+}
+
+export abstract class DateCore {
+  store: Store<CalendarStore>
+  options: ParsedDateCoreOptions
+  formatters: {
+    date: Intl.DateTimeFormat
+    time: Intl.DateTimeFormat
+    dateTime: Intl.DateTimeFormat
+  }
+  constructor(options: DateCoreOptions) {
+    const defaults = getDateTimeDefaults()
+    const parsedRange = parseDateRange({
+      range: options.range,
+      calendar: defaults.calendar,
+    })
+
+    this.options = {
+      ...defaults,
+      ...options,
+      range: parsedRange,
+    }
+
+    this.formatters = {
+      date:
+        options.dateFormatter ??
+        buildDateFormatter({
+          locale: this.options.locale,
+        }),
+      time:
+        options.timeFormatter ??
+        buildTimeFormatter({
+          locale: this.options.locale,
+        }),
+      dateTime:
+        options.dateTimeFormatter ??
+        buildDateTimeFormatter({
+          locale: this.options.locale,
+        }),
+    }
+
+    const now = Temporal.Now.plainDateISO().withCalendar(this.options.calendar)
+    const initialDate = constrainDateToRange({
+      date: now,
+      range: this.options.range,
+    })
+
+    this.store = new Store<CalendarStore>({
+      currentPeriod: initialDate,
+      activeDate: initialDate,
+      viewMode: options.viewMode,
+      eventsVersion: 0,
+      isPending: false,
+    })
+  }
+
+  formatDate(date: DateInput) {
+    return this.formatters.date.format(toDate(date))
+  }
+
+  formatTime(date: DateInput) {
+    return this.formatters.time.format(toDate(date))
+  }
+
+  formatDateTime(date: DateInput) {
+    return this.formatters.dateTime.format(toDate(date))
+  }
+
+  protected getFirstDayOfMonth() {
+    return getFirstDayOfMonth(
+      this.store.state.currentPeriod
+        .toString({ calendarName: 'auto' })
+        .substring(0, 7),
+    )
+  }
+
+  protected getFirstDayOfWeek() {
+    return getFirstDayOfWeek(
+      this.store.state.currentPeriod.toString(),
+      this.options.locale,
+    )
+  }
+
+  getWeekStartsOn() {
+    return this.getFirstDayOfWeek().dayOfWeek
+  }
+
+  protected getCalendarDays() {
+    let start: Temporal.PlainDate
+    switch (this.store.state.viewMode.unit) {
+      case 'month':
+        start = this.getFirstDayOfMonth().subtract({
+          days:
+            (this.getFirstDayOfMonth().dayOfWeek -
+              (this.getFirstDayOfWeek().dayOfWeek + 1) +
+              7) %
+            7,
+        })
+        break
+      case 'week':
+      case 'workWeek':
+        start = this.getFirstDayOfWeek()
+        break
+      case 'day':
+      default:
+        start = this.store.state.currentPeriod
+        break
+    }
+
+    let end: Temporal.PlainDate
+    switch (this.store.state.viewMode.unit) {
+      case 'month': {
+        const lastDayOfMonth = this.getFirstDayOfMonth()
+          .add({ months: this.store.state.viewMode.value })
+          .subtract({ days: 1 })
+        const lastDayOfMonthWeekDay =
+          (lastDayOfMonth.dayOfWeek -
+            (this.getFirstDayOfWeek().dayOfWeek + 1) +
+            7) %
+          7
+        end = lastDayOfMonth.add({ days: 6 - lastDayOfMonthWeekDay })
+        break
+      }
+      case 'week': {
+        end = this.getFirstDayOfWeek().add({
+          days: 7 * this.store.state.viewMode.value - 1,
+        })
+        break
+      }
+      case 'day': {
+        end = this.store.state.currentPeriod.add({
+          days: this.store.state.viewMode.value - 1,
+        })
+        break
+      }
+      case 'workWeek': {
+        end = start.add({ days: 4 })
+        break
+      }
+    }
+
+    const allDays = generateDateRange(start.toString(), end.toString())
+
+    if (this.store.state.viewMode.unit === 'month') {
+      const startMonthDate = this.store.state.currentPeriod.with({ day: 1 })
+      const endMonthDate = this.store.state.currentPeriod
+        .add({
+          months: this.store.state.viewMode.value - 1,
+        })
+        .with({
+          day: Temporal.PlainDate.from(
+            this.store.state.currentPeriod.toString({ calendarName: 'auto' }),
+          ).daysInMonth,
+        })
+
+      const filteredDays = allDays.filter(
+        (day) =>
+          Temporal.PlainDate.compare(day, startMonthDate) >= 0 &&
+          Temporal.PlainDate.compare(day, endMonthDate) <= 0,
+      )
+
+      if (this.options.range.start || this.options.range.end) {
+        return filteredDays.filter((day) =>
+          isDateInRange({ date: day, range: this.options.range }),
+        )
+      }
+
+      return filteredDays
+    }
+
+    if (this.options.range.start || this.options.range.end) {
+      return allDays.filter((day) =>
+        isDateInRange({ date: day, range: this.options.range }),
+      )
+    }
+
+    return allDays
+  }
+
+  getDaysNames(weekday: 'long' | 'short' = 'short') {
+    const baseDate = Temporal.PlainDate.from('2024-01-01')
+    const firstDayOfWeek = this.getFirstDayOfWeek().dayOfWeek
+
+    return Array.from({ length: 7 }).map((_, i) =>
+      baseDate
+        .add({ days: (i + (firstDayOfWeek - 1)) % 7 })
+        .toLocaleString(this.options.locale, { weekday: weekday }),
+    )
+  }
+
+  changeViewMode(newViewMode: ViewMode) {
+    this.store.setState((prev) => ({
+      ...prev,
+      viewMode: newViewMode,
+    }))
+
+    getTimeClient().emit('calendar:viewMode:changed', {
+      viewMode: {
+        value: newViewMode.value,
+        unit: newViewMode.unit,
+      },
+    })
+  }
+
+  goToPreviousPeriod() {
+    let newActiveDate: Temporal.PlainDate
+
+    switch (this.store.state.viewMode.unit) {
+      case 'month': {
+        newActiveDate = this.store.state.activeDate.subtract({
+          months: this.store.state.viewMode.value,
+        })
+        break
+      }
+
+      case 'week': {
+        newActiveDate = this.store.state.activeDate.subtract({
+          weeks: this.store.state.viewMode.value,
+        })
+        break
+      }
+
+      case 'day': {
+        newActiveDate = this.store.state.activeDate.subtract({
+          days: this.store.state.viewMode.value,
+        })
+        break
+      }
+      case 'workWeek': {
+        newActiveDate = this.store.state.activeDate.subtract({
+          days: 5,
+        })
+        break
+      }
+    }
+
+    const constrainedDate = constrainDateToRange({
+      date: newActiveDate,
+      range: this.options.range,
+    })
+    this.store.setState((prev) => ({
+      ...prev,
+      activeDate: constrainedDate,
+      currentPeriod: constrainedDate,
+    }))
+
+    getTimeClient().emit('calendar:navigate', {
+      direction: 'previous',
+      targetDate: constrainedDate.toString({ calendarName: 'never' }),
+    })
+  }
+
+  goToNextPeriod() {
+    let newActiveDate: Temporal.PlainDate
+
+    switch (this.store.state.viewMode.unit) {
+      case 'month': {
+        newActiveDate = this.store.state.activeDate.add({
+          months: this.store.state.viewMode.value,
+        })
+        break
+      }
+
+      case 'week': {
+        newActiveDate = this.store.state.activeDate.add({
+          weeks: this.store.state.viewMode.value,
+        })
+        break
+      }
+
+      case 'day': {
+        newActiveDate = this.store.state.activeDate.add({
+          days: this.store.state.viewMode.value,
+        })
+        break
+      }
+      case 'workWeek': {
+        newActiveDate = this.store.state.activeDate.add({
+          days: 5,
+        })
+        break
+      }
+    }
+
+    const constrainedDate = constrainDateToRange({
+      date: newActiveDate,
+      range: this.options.range,
+    })
+    this.store.setState((prev) => ({
+      ...prev,
+      activeDate: constrainedDate,
+      currentPeriod: constrainedDate,
+    }))
+
+    getTimeClient().emit('calendar:navigate', {
+      direction: 'next',
+      targetDate: constrainedDate.toString({ calendarName: 'never' }),
+    })
+  }
+
+  goToCurrentPeriod() {
+    const now = Temporal.Now.plainDateISO().withCalendar(this.options.calendar)
+    const constrainedDate = constrainDateToRange({
+      date: now,
+      range: this.options.range,
+    })
+    this.store.setState((prev) => ({
+      ...prev,
+      activeDate: constrainedDate,
+      currentPeriod: constrainedDate,
+    }))
+
+    getTimeClient().emit('calendar:navigate', {
+      direction: 'current',
+      targetDate: constrainedDate.toString({ calendarName: 'never' }),
+    })
+  }
+
+  goToSpecificPeriod(date: DateInput) {
+    const dateStr = toTemporalPlainDateString(date)
+    const targetDate = Temporal.PlainDate.from(dateStr).withCalendar(
+      this.options.calendar,
+    )
+    const constrainedDate = constrainDateToRange({
+      date: targetDate,
+      range: this.options.range,
+    })
+    this.store.setState((prev) => ({
+      ...prev,
+      activeDate: constrainedDate,
+      currentPeriod: constrainedDate,
+    }))
+
+    getTimeClient().emit('calendar:navigate', {
+      direction: 'specific',
+      targetDate: constrainedDate.toString({ calendarName: 'never' }),
+    })
+  }
+
+  canGoPreviousPeriod(): boolean {
+    let previousDate: Temporal.PlainDate
+
+    switch (this.store.state.viewMode.unit) {
+      case 'month': {
+        previousDate = this.store.state.activeDate.subtract({
+          months: this.store.state.viewMode.value,
+        })
+        break
+      }
+      case 'week': {
+        previousDate = this.store.state.activeDate.subtract({
+          weeks: this.store.state.viewMode.value,
+        })
+        break
+      }
+      case 'day': {
+        previousDate = this.store.state.activeDate.subtract({
+          days: this.store.state.viewMode.value,
+        })
+        break
+      }
+      case 'workWeek': {
+        previousDate = this.store.state.activeDate.subtract({ days: 5 })
+        break
+      }
+    }
+
+    return isDateInRange({ date: previousDate, range: this.options.range })
+  }
+
+  canGoNextPeriod(): boolean {
+    let nextDate: Temporal.PlainDate
+
+    switch (this.store.state.viewMode.unit) {
+      case 'month': {
+        nextDate = this.store.state.activeDate.add({
+          months: this.store.state.viewMode.value,
+        })
+        break
+      }
+      case 'week': {
+        nextDate = this.store.state.activeDate.add({
+          weeks: this.store.state.viewMode.value,
+        })
+        break
+      }
+      case 'day': {
+        nextDate = this.store.state.activeDate.add({
+          days: this.store.state.viewMode.value,
+        })
+        break
+      }
+      case 'workWeek': {
+        nextDate = this.store.state.activeDate.add({ days: 5 })
+        break
+      }
+    }
+
+    return isDateInRange({ date: nextDate, range: this.options.range })
+  }
+}
diff --git a/packages/time/src/calendar/expandRecurringEvent.ts b/packages/time/src/calendar/expandRecurringEvent.ts
new file mode 100644
index 00000000..a79d193e
--- /dev/null
+++ b/packages/time/src/calendar/expandRecurringEvent.ts
@@ -0,0 +1,291 @@
+import { Temporal } from '@js-temporal/polyfill'
+import type { Event, Resource } from './types'
+import { toPlainDateTimeString } from '~/date/parse'
+
+/**
+ * Expand a single recurring master event into individual occurrence instances
+ * that fall within the given viewport window [windowStart, windowEnd).
+ *
+ * Design contract:
+ * - The master occurrence (occurrence index 0) is returned when visible so
+ *   EXDATE/overrides can affect the first instance too.
+ * - Every generated occurrence gets a stable id: master id for index 0,
+ *   `"{masterId}_{n}"` for n >= 1, unless an override supplies `id`.
+ * - Each occurrence carries `_recurringMasterId`, `_occurrenceIndex`, and
+ *   `_occurrenceOriginalStart` so the UI can identify/edit it.
+ * - Occurrences are ephemeral: they are never stored in `_eventMap`.
+ *
+ * @param event       The master recurring event (already normalised, start/end are ISO strings).
+ * @param windowStart ISO date string (YYYY-MM-DD) — inclusive lower bound.
+ * @param windowEnd   ISO date string (YYYY-MM-DD) — exclusive upper bound.
+ */
+export function expandRecurringEvent<
+  TResource extends Resource = Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+>(event: TEvent, windowStart: string, windowEnd: string): Array<TEvent> {
+  const rule = (event as Event<TResource>).recurrence
+  if (!rule) return []
+
+  const masterStartStr = toPlainDateTimeString(event.start)
+  const masterEndStr = toPlainDateTimeString(event.end)
+
+  const masterStart = Temporal.PlainDateTime.from(masterStartStr)
+  const masterEnd = Temporal.PlainDateTime.from(masterEndStr)
+
+  const durationMs = masterStart
+    .toZonedDateTime('UTC')
+    .until(masterEnd.toZonedDateTime('UTC'))
+    .total('milliseconds')
+
+  const interval = Math.max(1, rule.interval ?? 1)
+  const windowStartDate = Temporal.PlainDate.from(windowStart)
+  const windowEndDate = Temporal.PlainDate.from(windowEnd)
+  const untilDate = rule.until ? Temporal.PlainDate.from(rule.until) : null
+  const frequency = rule.frequency
+
+  const byWeekday =
+    frequency === 'weekly'
+      ? (rule.byWeekday?.length ? rule.byWeekday : [masterStart.dayOfWeek])
+          .filter((day) => day >= 1 && day <= 7)
+          .filter((day, index, all) => all.indexOf(day) === index)
+          .sort((a, b) => a - b)
+      : null
+
+  const exDateTimes = new Set<string>()
+  const exDates = new Set<string>()
+  for (const exDate of rule.exDates ?? []) {
+    if (typeof exDate === 'string' && !exDate.includes('T')) {
+      exDates.add(
+        Temporal.PlainDate.from(exDate).toString({ calendarName: 'never' }),
+      )
+    } else {
+      const normalized = toPlainDateTimeString(exDate)
+      exDateTimes.add(normalized)
+      exDates.add(
+        Temporal.PlainDateTime.from(normalized)
+          .toPlainDate()
+          .toString({ calendarName: 'never' }),
+      )
+    }
+  }
+
+  const overridesByDateTime = new Map<
+    string,
+    NonNullable<typeof rule.overrides>[number]
+  >()
+  const overridesByDate = new Map<
+    string,
+    NonNullable<typeof rule.overrides>[number]
+  >()
+  for (const override of rule.overrides ?? []) {
+    const originalStart = override.originalStart
+    if (typeof originalStart === 'string' && !originalStart.includes('T')) {
+      overridesByDate.set(
+        Temporal.PlainDate.from(originalStart).toString({
+          calendarName: 'never',
+        }),
+        override,
+      )
+    } else {
+      const normalized = toPlainDateTimeString(originalStart)
+      overridesByDateTime.set(normalized, override)
+      overridesByDate.set(
+        Temporal.PlainDateTime.from(normalized)
+          .toPlainDate()
+          .toString({ calendarName: 'never' }),
+        override,
+      )
+    }
+  }
+
+  const occurrences: Array<TEvent> = []
+  let occurrenceIndex = 0
+  let step = 0
+  const MAX_STEPS = 3650
+
+  const masterMonday = masterStart
+    .toPlainDate()
+    .subtract({ days: masterStart.dayOfWeek - 1 })
+
+  const toDateTimeOnMasterTime = (date: Temporal.PlainDate) =>
+    Temporal.PlainDateTime.from({
+      year: date.year,
+      month: date.month,
+      day: date.day,
+      hour: masterStart.hour,
+      minute: masterStart.minute,
+      second: masterStart.second,
+    })
+
+  const addDuration = (start: string) =>
+    Temporal.PlainDateTime.from(start)
+      .toZonedDateTime('UTC')
+      .add({ milliseconds: durationMs })
+      .toPlainDateTime()
+      .toString({ smallestUnit: 'second' })
+
+  while (step <= MAX_STEPS) {
+    const candidates: Array<Temporal.PlainDateTime> = []
+
+    switch (frequency) {
+      case 'daily':
+        candidates.push(masterStart.add({ days: step * interval }))
+        break
+      case 'weekly': {
+        const targetMonday = masterMonday.add({ weeks: step * interval })
+        if (step === 0) candidates.push(masterStart)
+        for (const targetWeekday of byWeekday ?? [masterStart.dayOfWeek]) {
+          const targetDate = targetMonday.add({ days: targetWeekday - 1 })
+          candidates.push(toDateTimeOnMasterTime(targetDate))
+        }
+        break
+      }
+      case 'monthly':
+        candidates.push(addSafeMonths(masterStart, step * interval))
+        break
+      case 'yearly':
+        candidates.push(addSafeMonths(masterStart, step * interval * 12))
+        break
+      default:
+        candidates.push(masterStart.add({ days: step * interval }))
+        break
+    }
+
+    const uniqueCandidates = Array.from(
+      new Map(
+        candidates
+          .filter(
+            (candidate) =>
+              Temporal.PlainDateTime.compare(candidate, masterStart) >= 0,
+          )
+          .sort(Temporal.PlainDateTime.compare)
+          .map((candidate) => [
+            candidate.toString({ smallestUnit: 'second' }),
+            candidate,
+          ]),
+      ).values(),
+    )
+
+    for (const candidateStart of uniqueCandidates) {
+      const candidateDate = candidateStart.toPlainDate()
+      const candidateDateStr = candidateDate.toString({ calendarName: 'never' })
+
+      if (
+        untilDate &&
+        Temporal.PlainDate.compare(candidateDate, untilDate) >= 0
+      ) {
+        return occurrences
+      }
+
+      if (
+        !untilDate &&
+        rule.count !== undefined &&
+        occurrenceIndex >= rule.count
+      ) {
+        return occurrences
+      }
+
+      const originalStartStr = candidateStart.toString({
+        smallestUnit: 'second',
+      })
+      const originalEndStr = addDuration(originalStartStr)
+      const override =
+        overridesByDateTime.get(originalStartStr) ??
+        overridesByDate.get(candidateDateStr)
+
+      const excluded =
+        exDateTimes.has(originalStartStr) || exDates.has(candidateDateStr)
+
+      if (!excluded) {
+        const generatedId =
+          occurrenceIndex === 0 ? event.id : `${event.id}_${occurrenceIndex}`
+        const overrideStart = override?.start
+        const overrideEnd = override?.end
+        const occurrenceStartStr =
+          overrideStart != null
+            ? toPlainDateTimeString(overrideStart)
+            : originalStartStr
+        const occurrenceEndStr =
+          overrideEnd != null
+            ? toPlainDateTimeString(overrideEnd)
+            : overrideStart != null
+              ? addDuration(occurrenceStartStr)
+              : originalEndStr
+
+        const occurrenceDate = Temporal.PlainDateTime.from(occurrenceStartStr)
+          .toPlainDate()
+          .toString({ calendarName: 'never' })
+
+        if (
+          occurrenceDate >=
+            windowStartDate.toString({ calendarName: 'never' }) &&
+          occurrenceDate < windowEndDate.toString({ calendarName: 'never' })
+        ) {
+          const overrideFields = override
+            ? ({ ...override } as Record<string, unknown>)
+            : {}
+          delete overrideFields.originalStart
+          delete overrideFields.id
+          delete overrideFields.start
+          delete overrideFields.end
+
+          occurrences.push({
+            ...event,
+            ...overrideFields,
+            id: (override?.id ?? generatedId) as TEvent['id'],
+            start: occurrenceStartStr,
+            end: occurrenceEndStr,
+            _recurringMasterId: event.id,
+            _occurrenceIndex: occurrenceIndex,
+            _occurrenceOriginalStart: originalStartStr,
+            _originalStart: undefined,
+            _originalEnd: undefined,
+          } as TEvent)
+        }
+      }
+
+      occurrenceIndex++
+
+      if (Temporal.PlainDate.compare(candidateDate, windowEndDate) >= 0) {
+        return occurrences
+      }
+    }
+
+    step++
+  }
+
+  return occurrences
+}
+
+/**
+ * Add N months to a PlainDateTime, clamping the day-of-month to the last valid
+ * day of the resulting month (e.g. Jan 31 + 1 month → Feb 28/29).
+ */
+function addSafeMonths(
+  dt: Temporal.PlainDateTime,
+  months: number,
+): Temporal.PlainDateTime {
+  let year = dt.year
+  let month = dt.month + months
+
+  // Normalise month overflow
+  year += Math.floor((month - 1) / 12)
+  month = ((month - 1) % 12) + 1
+
+  // Clamp day to last valid day in target month
+  const daysInMonth = Temporal.PlainDate.from({
+    year,
+    month,
+    day: 1,
+  }).daysInMonth
+  const day = Math.min(dt.day, daysInMonth)
+
+  return Temporal.PlainDateTime.from({
+    year,
+    month,
+    day,
+    hour: dt.hour,
+    minute: dt.minute,
+    second: dt.second,
+  })
+}
diff --git a/packages/time/src/calendar/generateDateRange.ts b/packages/time/src/calendar/generateDateRange.ts
new file mode 100644
index 00000000..9315b34b
--- /dev/null
+++ b/packages/time/src/calendar/generateDateRange.ts
@@ -0,0 +1,16 @@
+import { Temporal } from '@js-temporal/polyfill'
+
+export const generateDateRange = (
+  start: string,
+  end: string,
+): Array<Temporal.PlainDate> => {
+  const startDate = Temporal.PlainDate.from(start)
+  const endDate = Temporal.PlainDate.from(end)
+  const dates: Array<Temporal.PlainDate> = []
+  let current = startDate
+  while (Temporal.PlainDate.compare(current, endDate) <= 0) {
+    dates.push(current)
+    current = current.add({ days: 1 })
+  }
+  return dates
+}
diff --git a/packages/time/src/calendar/getEventProps.ts b/packages/time/src/calendar/getEventProps.ts
new file mode 100644
index 00000000..4608d854
--- /dev/null
+++ b/packages/time/src/calendar/getEventProps.ts
@@ -0,0 +1,121 @@
+import { Temporal } from '@js-temporal/polyfill'
+import type { CalendarStore, Event, EventDateTimeInput } from './types'
+import { toPlainDateTimeString } from '~/date/parse'
+
+interface GetEventPropsOptions {
+  timeZone: Temporal.TimeZoneLike
+}
+
+const MINUTES_IN_DAY = 24 * 60
+
+const toZonedDateTime = (
+  dateInput: EventDateTimeInput,
+  timeZone: Temporal.TimeZoneLike,
+): Temporal.ZonedDateTime =>
+  Temporal.PlainDateTime.from(toPlainDateTimeString(dateInput)).toZonedDateTime(
+    timeZone,
+  )
+
+const toMinutes = (date: Temporal.ZonedDateTime): number =>
+  date.hour * 60 + date.minute
+
+const toPercent = (minutes: number): number => (minutes / MINUTES_IN_DAY) * 100
+
+const hasTimeOverlap = (
+  aStart: Temporal.ZonedDateTime,
+  aEnd: Temporal.ZonedDateTime,
+  bStart: Temporal.ZonedDateTime,
+  bEnd: Temporal.ZonedDateTime,
+): boolean => {
+  const compare = Temporal.ZonedDateTime.compare
+  return compare(aStart, bEnd) < 0 && compare(aEnd, bStart) > 0
+}
+
+const getFullEventTimes = (
+  segments: Array<Event>,
+  timeZone: Temporal.TimeZoneLike,
+  fallback: Event,
+): { start: string; end: string } => {
+  if (segments.length <= 1) {
+    return {
+      start: toPlainDateTimeString(fallback.start),
+      end: toPlainDateTimeString(fallback.end),
+    }
+  }
+
+  const sorted = [...segments].sort((a, b) =>
+    Temporal.ZonedDateTime.compare(
+      toZonedDateTime(a.start, timeZone),
+      toZonedDateTime(b.start, timeZone),
+    ),
+  )
+
+  return {
+    start: toPlainDateTimeString(sorted[0]?.start ?? fallback.start),
+    end: toPlainDateTimeString(sorted[sorted.length - 1]?.end ?? fallback.end),
+  }
+}
+
+export const getEventProps = (
+  eventMap: Map<string, Array<Event>>,
+  event: Event,
+  state: CalendarStore,
+  options: GetEventPropsOptions,
+) => {
+  const { timeZone } = options
+  const allEvents = [...eventMap.values()].flat()
+
+  const segmentStart = toZonedDateTime(event.start, timeZone)
+  const segmentEnd = toZonedDateTime(event.end, timeZone)
+
+  const segments = allEvents.filter((e) => e.id === event.id)
+  const isSplitEvent = segments.length > 1
+  const { start, end } = getFullEventTimes(segments, timeZone, event)
+
+  const overlappingEvents = allEvents.filter((e) => {
+    if (e.id === event.id) return false
+    const eStart = toZonedDateTime(e.start, timeZone)
+    const eEnd = toZonedDateTime(e.end, timeZone)
+    return hasTimeOverlap(segmentStart, segmentEnd, eStart, eEnd)
+  })
+
+  const baseProps = { isSplitEvent, overlappingEvents, start, end }
+
+  const isTimeGridView =
+    state.viewMode.unit === 'week' || state.viewMode.unit === 'day'
+
+  if (!isTimeGridView) {
+    return baseProps
+  }
+
+  const startMinutes = toMinutes(segmentStart)
+  const endMinutes = toMinutes(segmentEnd)
+  const durationMinutes = endMinutes - startMinutes
+
+  const overlappingCount = overlappingEvents.length
+  const columnCount = overlappingCount + 1
+
+  const eventIndex =
+    overlappingCount > 0
+      ? overlappingEvents.filter((e) => {
+          const eStart = toZonedDateTime(e.start, timeZone)
+          const comparison = Temporal.ZonedDateTime.compare(
+            eStart,
+            segmentStart,
+          )
+          if (comparison !== 0) return comparison < 0
+          return e.id < event.id
+        }).length
+      : 0
+
+  return {
+    ...baseProps,
+    style: {
+      top: `${toPercent(startMinutes)}%`,
+      height: `${toPercent(durationMinutes)}%`,
+      left:
+        overlappingCount > 0 ? `${(eventIndex * 100) / columnCount}%` : '0%',
+      width: overlappingCount > 0 ? `${100 / columnCount}%` : '100%',
+    },
+  }
+}
diff --git a/packages/time/src/calendar/getResizeProps.ts b/packages/time/src/calendar/getResizeProps.ts
new file mode 100644
index 00000000..b619d8db
--- /dev/null
+++ b/packages/time/src/calendar/getResizeProps.ts
@@ -0,0 +1,601 @@
+import { Temporal } from '@js-temporal/polyfill'
+
+export type ResizeEdge = 'top' | 'bottom' | 'left' | 'right'
+
+export interface UnavailableTimeRange {
+  /** Start time in minutes from midnight (0-1440) */
+  startMinutes: number
+  /** End time in minutes from midnight (0-1440) */
+  endMinutes: number
+}
+
+export interface ResizeConstraints {
+  minDurationMinutes?: number
+  snapToMinutes?: number
+  /** Unavailable time ranges that the event cannot be resized into */
+  unavailableRanges?: Array<UnavailableTimeRange>
+}
+
+const MINUTES_IN_DAY = 24 * 60
+
+const extractDateFromDateTime = (dateTime: string): string =>
+  dateTime.split('T')[0] ?? dateTime
+
+interface CalculateResizedEventOptions {
+  originalStart: string
+  originalEnd: string
+  edge: ResizeEdge
+  deltaMinutes: number
+  timeZone: Temporal.TimeZoneLike
+  constraints?: ResizeConstraints
+}
+
+interface ResizedEventResult {
+  start: string
+  end: string
+  durationMinutes: number
+}
+
+const DEFAULT_MIN_DURATION_MINUTES = 15
+const DEFAULT_SNAP_TO_MINUTES = 15
+
+const roundToNearestInterval = (minutes: number, interval: number): number =>
+  Math.round(minutes / interval) * interval
+
+const getMinutesFromMidnight = (zdt: Temporal.ZonedDateTime): number =>
+  zdt.hour * 60 + zdt.minute
+
+const setMinutesFromMidnight = (
+  zdt: Temporal.ZonedDateTime,
+  minutes: number,
+): Temporal.ZonedDateTime => {
+  const clampedMinutes = Math.max(0, Math.min(minutes, MINUTES_IN_DAY - 1))
+  const hours = Math.floor(clampedMinutes / 60)
+  const mins = clampedMinutes % 60
+  return zdt.with({ hour: hours, minute: mins, second: 0, millisecond: 0 })
+}
+
+export function calculateResizedEvent(
+  options: CalculateResizedEventOptions,
+): ResizedEventResult {
+  const {
+    originalStart,
+    originalEnd,
+    edge,
+    deltaMinutes,
+    timeZone,
+    constraints = {},
+  } = options
+
+  const {
+    minDurationMinutes = DEFAULT_MIN_DURATION_MINUTES,
+    snapToMinutes = DEFAULT_SNAP_TO_MINUTES,
+    unavailableRanges = [],
+  } = constraints
+
+  const startZdt =
+    Temporal.PlainDateTime.from(originalStart).toZonedDateTime(timeZone)
+  const endZdt =
+    Temporal.PlainDateTime.from(originalEnd).toZonedDateTime(timeZone)
+
+  const snappedDelta = roundToNearestInterval(deltaMinutes, snapToMinutes)
+
+  let newStartZdt = startZdt
+  let newEndZdt = endZdt
+
+  const isEntireDayUnavailable = unavailableRanges.some(
+    (range) => range.startMinutes === 0 && range.endMinutes >= MINUTES_IN_DAY,
+  )
+
+  const effectiveEdge =
+    edge === 'left' ? 'top' : edge === 'right' ? 'bottom' : edge
+
+  if (effectiveEdge === 'top') {
+    newStartZdt = startZdt.add({ minutes: snappedDelta })
+    const maxStartZdt = endZdt.subtract({ minutes: minDurationMinutes })
+    if (Temporal.ZonedDateTime.compare(newStartZdt, maxStartZdt) > 0) {
+      newStartZdt = maxStartZdt
+    }
+
+    if (isEntireDayUnavailable) {
+      const originalStartMinutes = getMinutesFromMidnight(startZdt)
+      newStartZdt = setMinutesFromMidnight(newStartZdt, originalStartMinutes)
+    } else {
+      let newStartMinutes = getMinutesFromMidnight(newStartZdt)
+
+      for (const range of unavailableRanges) {
+        if (
+          newStartMinutes >= range.startMinutes &&
+          newStartMinutes < range.endMinutes
+        ) {
+          if (range.endMinutes < MINUTES_IN_DAY) {
+            newStartZdt = setMinutesFromMidnight(newStartZdt, range.endMinutes)
+            newStartMinutes = range.endMinutes
+          } else if (range.startMinutes > 0) {
+            const validTime = range.startMinutes - snapToMinutes
+            if (validTime >= 0) {
+              newStartZdt = setMinutesFromMidnight(newStartZdt, validTime)
+              newStartMinutes = validTime
+            }
+          }
+        }
+      }
+    }
+  } else {
+    newEndZdt = endZdt.add({ minutes: snappedDelta })
+    const minEndZdt = startZdt.add({ minutes: minDurationMinutes })
+    if (Temporal.ZonedDateTime.compare(newEndZdt, minEndZdt) < 0) {
+      newEndZdt = minEndZdt
+    }
+
+    if (isEntireDayUnavailable) {
+      const originalEndMinutes = getMinutesFromMidnight(endZdt)
+      newEndZdt = setMinutesFromMidnight(newEndZdt, originalEndMinutes)
+    } else {
+      let newEndMinutes = getMinutesFromMidnight(newEndZdt)
+
+      for (const range of unavailableRanges) {
+        if (
+          newEndMinutes > range.startMinutes &&
+          newEndMinutes <= range.endMinutes
+        ) {
+          if (range.startMinutes > 0) {
+            newEndZdt = setMinutesFromMidnight(newEndZdt, range.startMinutes)
+            newEndMinutes = range.startMinutes
+          } else if (range.endMinutes < MINUTES_IN_DAY) {
+            const validTime = range.endMinutes + snapToMinutes
+            if (validTime <= MINUTES_IN_DAY) {
+              newEndZdt = setMinutesFromMidnight(newEndZdt, validTime)
+              newEndMinutes = validTime
+            }
+          }
+        }
+      }
+    }
+  }
+
+  const durationMs = newEndZdt.epochMilliseconds - newStartZdt.epochMilliseconds
+  const durationMinutes = Math.floor(durationMs / (1000 * 60))
+
+  return {
+    start: newStartZdt.toPlainDateTime().toString(),
+    end: newEndZdt.toPlainDateTime().toString(),
+    durationMinutes,
+  }
+}
+
+export function calculateDeltaMinutesFromPixels(
+  deltaPixels: number,
+  containerHeight: number,
+  minutesInDay: number = 24 * 60,
+): number {
+  return (deltaPixels / containerHeight) * minutesInDay
+}
+
+export function calculateDeltaMinutesFromPixelsHorizontal(
+  deltaPixels: number,
+  containerWidth: number,
+  totalMinutesInView: number,
+): number {
+  return (deltaPixels / containerWidth) * totalMinutesInView
+}
+
+export interface ResizeHandleStyle {
+  position: 'absolute'
+  left: number
+  right: number
+  height: string
+  cursor: 'ns-resize'
+  zIndex: number
+  top?: number
+  bottom?: number
+}
+
+export function getResizeHandleStyle(edge: ResizeEdge): ResizeHandleStyle {
+  const baseStyle: ResizeHandleStyle = {
+    position: 'absolute',
+    left: 0,
+    right: 0,
+    height: '8px',
+    cursor: 'ns-resize',
+    zIndex: 10,
+  }
+
+  if (edge === 'top') {
+    return { ...baseStyle, top: 0 }
+  }
+  return { ...baseStyle, bottom: 0 }
+}
+
+/**
+ * Information about a segment's position within a multi-day event
+ */
+export interface SegmentInfo {
+  /** Whether this is the first segment of a multi-day event */
+  isFirstSegment: boolean
+  /** Whether this is the last segment of a multi-day event */
+  isLastSegment: boolean
+  /** Whether this segment is part of a split multi-day event */
+  isSplitEvent: boolean
+  /** The original event start (before splitting) */
+  originalStart: string
+  /** The original event end (before splitting) */
+  originalEnd: string
+  /** The segment's start time */
+  segmentStart: string
+  /** The segment's end time */
+  segmentEnd: string
+}
+
+export function getSegmentInfo(event: {
+  start: string
+  end: string
+  _originalStart?: string
+  _originalEnd?: string
+}): SegmentInfo {
+  const originalStart = event._originalStart ?? event.start
+  const originalEnd = event._originalEnd ?? event.end
+  const originalStartDate = extractDateFromDateTime(originalStart)
+  const originalEndDate = extractDateFromDateTime(originalEnd)
+
+  const segmentStart = event.start
+  const segmentEnd = event.end
+  const segmentStartDate = extractDateFromDateTime(segmentStart)
+  const segmentEndDate = extractDateFromDateTime(segmentEnd)
+
+  const isSplitEvent =
+    event._originalStart !== undefined || event._originalEnd !== undefined
+  const isFirstSegment = originalStartDate === segmentStartDate
+  const isLastSegment =
+    originalEndDate === segmentStartDate || originalEndDate === segmentEndDate
+
+  return {
+    isFirstSegment,
+    isLastSegment,
+    isSplitEvent,
+    originalStart,
+    originalEnd,
+    segmentStart,
+    segmentEnd,
+  }
+}
+
+/**
+ * Style for positioned elements (events, ghosts)
+ */
+export interface PositionStyle {
+  top: string
+  height: string
+}
+
+/**
+ * Result of resize preview calculation for a segment
+ */
+export interface SegmentResizePreview {
+  /** Whether the segment should be hidden (shrunk away) */
+  shouldHide: boolean
+  /** The preview style to apply, if any */
+  previewStyle: PositionStyle | null
+  /** Whether the preview has changed from the original */
+  hasChanged: boolean
+}
+
+export interface ResizePreviewOptions {
+  /** The date string of the day being rendered (YYYY-MM-DD) */
+  dayDate: string
+  /** The original start of the event (before resize) */
+  originalStart: string
+  /** The original end of the event (before resize) */
+  originalEnd: string
+  /** The preview start during resize */
+  previewStart: string
+  /** The preview end during resize */
+  previewEnd: string
+}
+
+/**
+ * Calculates the resize preview state for a segment on a specific day
+ */
+export function calculateSegmentResizePreview(
+  options: ResizePreviewOptions,
+): SegmentResizePreview {
+  const { dayDate, originalStart, originalEnd, previewStart, previewEnd } =
+    options
+
+  const previewStartDate = extractDateFromDateTime(previewStart)
+  const previewEndDate = extractDateFromDateTime(previewEnd)
+
+  const previewAffectsThisDay =
+    dayDate >= previewStartDate && dayDate <= previewEndDate
+
+  const hasChanged =
+    previewStart !== originalStart || previewEnd !== originalEnd
+
+  if (!previewAffectsThisDay) {
+    return { shouldHide: true, previewStyle: null, hasChanged }
+  }
+
+  if (!hasChanged) {
+    return { shouldHide: false, previewStyle: null, hasChanged: false }
+  }
+
+  const isPreviewFirstDay = previewStartDate === dayDate
+  const isPreviewLastDay = previewEndDate === dayDate
+
+  let effectiveStart: string
+  let effectiveEnd: string
+
+  if (isPreviewFirstDay && isPreviewLastDay) {
+    effectiveStart = previewStart
+    effectiveEnd = previewEnd
+  } else if (isPreviewFirstDay) {
+    effectiveStart = previewStart
+    effectiveEnd = `${dayDate}T23:59:59`
+  } else if (isPreviewLastDay) {
+    effectiveStart = `${dayDate}T00:00:00`
+    effectiveEnd = previewEnd
+  } else {
+    effectiveStart = `${dayDate}T00:00:00`
+    effectiveEnd = `${dayDate}T23:59:59`
+  }
+
+  const startDate = new Date(effectiveStart)
+  const endDate = new Date(effectiveEnd)
+  const startMinutes = startDate.getHours() * 60 + startDate.getMinutes()
+  const endMinutes =
+    endDate.getHours() * 60 + endDate.getMinutes() || MINUTES_IN_DAY
+
+  const topPercent = (startMinutes / MINUTES_IN_DAY) * 100
+  const heightPercent = ((endMinutes - startMinutes) / MINUTES_IN_DAY) * 100
+
+  if (heightPercent <= 0) {
+    return { shouldHide: true, previewStyle: null, hasChanged }
+  }
+
+  // Render the real geometry — never a min-height floor. Flooring pads the box
+  // beyond the real edge, so resizing one edge makes the *other* (fixed) edge
+  // appear to jump when the true size is revealed. Keeping geometry real means
+  // the edge you are not dragging never moves.
+  return {
+    shouldHide: false,
+    previewStyle: {
+      top: `${topPercent}%`,
+      height: `${heightPercent}%`,
+    },
+    hasChanged,
+  }
+}
+
+export interface GhostPreviewOptions {
+  /** The date string of the day being rendered (YYYY-MM-DD) */
+  dayDate: string
+  /** The preview start during resize */
+  previewStart: string
+  /** The preview end during resize */
+  previewEnd: string
+}
+
+/**
+ * Calculates the ghost preview style for a day that doesn't have an existing segment
+ */
+export function calculateGhostPreviewStyle(
+  options: GhostPreviewOptions,
+): PositionStyle | null {
+  const { dayDate, previewStart, previewEnd } = options
+
+  const previewStartDate = extractDateFromDateTime(previewStart)
+  const previewEndDate = extractDateFromDateTime(previewEnd)
+
+  const isDayInPreviewRange =
+    dayDate >= previewStartDate && dayDate <= previewEndDate
+
+  if (!isDayInPreviewRange) {
+    return null
+  }
+
+  const isFirstDay = dayDate === previewStartDate
+  const isLastDay = dayDate === previewEndDate
+
+  let ghostTop: number
+  let ghostBottom: number
+
+  if (isFirstDay && isLastDay) {
+    const startDate = new Date(previewStart)
+    const endDate = new Date(previewEnd)
+    ghostTop =
+      ((startDate.getHours() * 60 + startDate.getMinutes()) / MINUTES_IN_DAY) *
+      100
+    ghostBottom =
+      ((endDate.getHours() * 60 + endDate.getMinutes()) / MINUTES_IN_DAY) * 100
+  } else if (isFirstDay) {
+    const startDate = new Date(previewStart)
+    ghostTop =
+      ((startDate.getHours() * 60 + startDate.getMinutes()) / MINUTES_IN_DAY) *
+      100
+    ghostBottom = 100
+  } else if (isLastDay) {
+    const endDate = new Date(previewEnd)
+    ghostTop = 0
+    ghostBottom =
+      ((endDate.getHours() * 60 + endDate.getMinutes()) / MINUTES_IN_DAY) * 100
+  } else {
+    ghostTop = 0
+    ghostBottom = 100
+  }
+
+  const ghostHeight = ghostBottom - ghostTop
+  if (ghostHeight <= 0) {
+    return null
+  }
+
+  return {
+    top: `${ghostTop}%`,
+    height: `${ghostHeight}%`,
+  }
+}
+
+export interface TimelineResizePreviewOptions {
+  previewStart: string
+  previewEnd: string
+  firstDayIso: string
+  totalDays: number
+}
+
+export interface TimelineResizePreviewStyle {
+  left: string
+  width: string
+}
+
+/**
+ * Calculates left/width percentages for timeline resize preview
+ */
+export function calculateTimelineResizePreview(
+  options: TimelineResizePreviewOptions,
+): TimelineResizePreviewStyle {
+  const { previewStart, previewEnd, firstDayIso, totalDays } = options
+
+  const startStr = previewStart
+  const endStr = previewEnd
+  const startDateStr = startStr.split('T')[0]!
+  const endDateStr = endStr.split('T')[0]!
+  const startTimeStr = startStr.split('T')[1] ?? '00:00:00'
+  const endTimeStr = endStr.split('T')[1] ?? '00:00:00'
+
+  const startTimeParts = startTimeStr.split(':').map(Number)
+  const endTimeParts = endTimeStr.split(':').map(Number)
+
+  const startDayOffset = Math.round(
+    (new Date(startDateStr).getTime() - new Date(firstDayIso).getTime()) /
+      (1000 * 60 * 60 * 24),
+  )
+  const endDayOffset = Math.round(
+    (new Date(endDateStr).getTime() - new Date(firstDayIso).getTime()) /
+      (1000 * 60 * 60 * 24),
+  )
+
+  const startHours =
+    startDayOffset * 24 +
+    (startTimeParts[0] ?? 0) +
+    (startTimeParts[1] ?? 0) / 60
+  const endHours =
+    endDayOffset * 24 + (endTimeParts[0] ?? 0) + (endTimeParts[1] ?? 0) / 60
+
+  const totalHours = totalDays * 24
+
+  const left = Math.max(0, (startHours / totalHours) * 100)
+  const right = Math.min(100, (endHours / totalHours) * 100)
+  const width = Math.max(0, right - left)
+
+  return {
+    left: `${left}%`,
+    width: `${width}%`,
+  }
+}
+
+/**
+ * Checks if an event spans multiple days
+ */
+export function isMultiDayEvent(start: string, end: string): boolean {
+  const startDate = new Date(start)
+  const endDate = new Date(end)
+  return startDate.toDateString() !== endDate.toDateString()
+}
+
+export interface EventTimeRange {
+  start: string
+  end: string
+  isMultiDay: boolean
+}
+
+/**
+ * Gets the time range to display for an event, considering resize state
+ */
+export function getEventDisplayTimeRange(options: {
+  originalStart: string
+  originalEnd: string
+  isBeingResized?: boolean
+  previewStart?: string
+  previewEnd?: string
+}): EventTimeRange {
+  const {
+    originalStart,
+    originalEnd,
+    isBeingResized,
+    previewStart,
+    previewEnd,
+  } = options
+
+  const displayStart =
+    isBeingResized && previewStart ? previewStart : originalStart
+  const displayEnd = isBeingResized && previewEnd ? previewEnd : originalEnd
+
+  return {
+    start: displayStart,
+    end: displayEnd,
+    isMultiDay: isMultiDayEvent(displayStart, displayEnd),
+  }
+}
+
+export interface FormatEventTimeOptions {
+  /** Locale for formatting (e.g., 'en-US') */
+  locale?: string
+  /** Whether to include date for single-day events */
+  alwaysShowDate?: boolean
+}
+
+export interface FormattedEventTime {
+  /** Formatted start string */
+  startFormatted: string
+  /** Formatted end string */
+  endFormatted: string
+  /** Full formatted range string */
+  rangeFormatted: string
+  /** Whether this is a multi-day event */
+  isMultiDay: boolean
+}
+
+/**
+ * Formats an event's time range for display
+ * For multi-day events: includes date and time
+ * For single-day events: includes only time (unless alwaysShowDate is true)
+ */
+export function formatEventTimeRange(
+  start: string,
+  end: string,
+  options: FormatEventTimeOptions = {},
+): FormattedEventTime {
+  const { locale = 'en-US', alwaysShowDate = false } = options
+
+  const startDate = new Date(start)
+  const endDate = new Date(end)
+  const isMultiDay = startDate.toDateString() !== endDate.toDateString()
+
+  const timeOptions: Intl.DateTimeFormatOptions = {
+    hour: 'numeric',
+    minute: '2-digit',
+  }
+
+  const dateTimeOptions: Intl.DateTimeFormatOptions = {
+    month: 'short',
+    day: 'numeric',
+    hour: 'numeric',
+    minute: '2-digit',
+  }
+
+  const showDate = isMultiDay || alwaysShowDate
+
+  const startFormatted = showDate
+    ? startDate.toLocaleString(locale, dateTimeOptions)
+    : startDate.toLocaleTimeString(locale, timeOptions)
+
+  const endFormatted = showDate
+    ? endDate.toLocaleString(locale, dateTimeOptions)
+    : endDate.toLocaleTimeString(locale, timeOptions)
+
+  return {
+    startFormatted,
+    endFormatted,
+    rangeFormatted: `${startFormatted} - ${endFormatted}`,
+    isMultiDay,
+  }
+}
diff --git a/packages/time/src/calendar/getTimeSlots.ts b/packages/time/src/calendar/getTimeSlots.ts
new file mode 100644
index 00000000..2cf54413
--- /dev/null
+++ b/packages/time/src/calendar/getTimeSlots.ts
@@ -0,0 +1,52 @@
+import type { TimeSlot } from './types'
+
+interface TimeSlotOptions {
+  /** Start hour (0-23). Default: 0 */
+  startHour?: number
+  /** End hour (0-24). Default: 24 */
+  endHour?: number
+  /** Interval in minutes. Default: 60 */
+  interval?: number
+}
+/**
+ * Generates time slots for calendar day views.
+ * Returns an array of time slots with labels formatted according to the locale.
+ *
+ * @param locale - The locale to use for formatting time labels (BCP 47 format)
+ * @param options - Configuration options for time slots
+ * @returns Array of time slots with hour, minute, and formatted label
+ */
+export function getTimeSlots(
+  locale: Intl.UnicodeBCP47LocaleIdentifier,
+  options?: TimeSlotOptions,
+): Array<TimeSlot> {
+  const { startHour = 0, endHour = 24, interval = 60 } = options ?? {}
+
+  const slots: Array<TimeSlot> = []
+  const totalMinutes = (endHour - startHour) * 60
+  const numSlots = Math.floor(totalMinutes / interval)
+
+  const formatter = new Intl.DateTimeFormat(locale, {
+    hour: 'numeric',
+    minute: '2-digit',
+  })
+
+  for (let i = 0; i < numSlots; i++) {
+    const totalMinutesFromStart = startHour * 60 + i * interval
+    const hour = Math.floor(totalMinutesFromStart / 60)
+    const minute = totalMinutesFromStart % 60
+
+    if (hour >= 24) break
+
+    const date = new Date(2024, 0, 1, hour, minute)
+    const label = formatter.format(date)
+
+    slots.push({
+      hour,
+      minute,
+      label,
+    })
+  }
+
+  return slots
+}
diff --git a/packages/time/src/calendar/groupDaysBy.ts b/packages/time/src/calendar/groupDaysBy.ts
new file mode 100644
index 00000000..669055cd
--- /dev/null
+++ b/packages/time/src/calendar/groupDaysBy.ts
@@ -0,0 +1,180 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { getWeekInfo } from '../polyfills/getWeekInfo'
+import type { Day, Event, Resource } from './types'
+
+interface GroupDaysByBaseProps<
+  TResource extends Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+> {
+  days: Array<Day<TResource, TEvent> | null>
+  weekStartsOn: number
+  locale: string
+}
+
+type GroupDaysByMonthProps<
+  TResource extends Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+> = GroupDaysByBaseProps<TResource, TEvent> & {
+  unit: 'month'
+  fillMissingDays?: never
+}
+
+type GroupDaysByWeekProps<
+  TResource extends Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+> = GroupDaysByBaseProps<TResource, TEvent> & {
+  unit: 'week' | 'workWeek'
+  fillMissingDays?: boolean
+}
+
+export type GroupDaysByProps<
+  TResource extends Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+> =
+  | GroupDaysByMonthProps<TResource, TEvent>
+  | GroupDaysByWeekProps<TResource, TEvent>
+
+export const groupDaysBy = <
+  TResource extends Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+>({
+  days,
+  unit,
+  fillMissingDays = true,
+  weekStartsOn,
+  locale,
+}: GroupDaysByProps<TResource, TEvent>): Array<
+  Array<Day<TResource, TEvent> | null>
+> => {
+  const groups: Array<Array<Day<TResource, TEvent> | null>> = []
+  const { weekend } = getWeekInfo(locale)
+
+  switch (unit) {
+    case 'week': {
+      const weeks: Array<Array<Day<TResource, TEvent> | null>> = []
+      let currentWeek: Array<Day<TResource, TEvent> | null> = []
+
+      days.forEach((day) => {
+        if (currentWeek.length === 0 && day?.date.dayOfWeek !== weekStartsOn) {
+          if (day) {
+            const dayOfWeek = (day.date.dayOfWeek - weekStartsOn + 7) % 7
+            for (let i = 0; i < dayOfWeek; i++) {
+              const newDate = day.date.subtract({ days: dayOfWeek - i })
+              currentWeek.push(
+                fillMissingDays
+                  ? {
+                      date: newDate,
+                      isoDate: newDate.toString({ calendarName: 'never' }),
+                      events: [],
+                      allDayEvents: [],
+                      isToday: false,
+                      isInCurrentPeriod: false,
+                    }
+                  : null,
+              )
+            }
+          }
+        }
+        currentWeek.push(day)
+        if (currentWeek.length === 7) {
+          weeks.push(currentWeek)
+          currentWeek = []
+        }
+      })
+
+      if (currentWeek.length > 0) {
+        while (currentWeek.length < 7) {
+          const lastDate =
+            currentWeek[currentWeek.length - 1]?.date ??
+            Temporal.PlainDate.from('2024-01-01')
+          const newDate = lastDate.add({ days: 1 })
+          currentWeek.push(
+            fillMissingDays
+              ? {
+                  date: newDate,
+                  isoDate: newDate.toString({ calendarName: 'never' }),
+                  events: [],
+                  allDayEvents: [],
+                  isToday: false,
+                  isInCurrentPeriod: false,
+                }
+              : null,
+          )
+        }
+        weeks.push(currentWeek)
+      }
+
+      return weeks
+    }
+
+    case 'workWeek': {
+      const workWeeks: Array<Array<Day<TResource, TEvent> | null>> = []
+      let currentWorkWeek: Array<Day<TResource, TEvent> | null> = []
+
+      days.forEach((day) => {
+        if (
+          currentWorkWeek.length === 0 &&
+          day?.date.dayOfWeek !== weekStartsOn
+        ) {
+          if (day) {
+            const dayOfWeek = (day.date.dayOfWeek - weekStartsOn + 7) % 7
+            for (let i = 0; i < dayOfWeek; i++) {
+              const newDay = day.date.subtract({ days: dayOfWeek - i })
+              if (!weekend.includes(newDay.dayOfWeek)) {
+                currentWorkWeek.push(
+                  fillMissingDays
+                    ? {
+                        date: newDay,
+                        isoDate: newDay.toString({ calendarName: 'never' }),
+                        events: [],
+                        allDayEvents: [],
+                        isToday: false,
+                        isInCurrentPeriod: false,
+                      }
+                    : null,
+                )
+              }
+            }
+          }
+        }
+        if (day && !weekend.includes(day.date.dayOfWeek)) {
+          currentWorkWeek.push(day)
+        }
+        if (currentWorkWeek.length === 5) {
+          workWeeks.push(currentWorkWeek)
+          currentWorkWeek = []
+        }
+      })
+
+      if (currentWorkWeek.length > 0) {
+        while (currentWorkWeek.length < 5) {
+          const lastDate =
+            currentWorkWeek[currentWorkWeek.length - 1]?.date ??
+            Temporal.PlainDate.from('2024-01-01')
+          const nextDate = lastDate.add({ days: 1 })
+          if (!weekend.includes(nextDate.dayOfWeek)) {
+            currentWorkWeek.push(
+              fillMissingDays
+                ? {
+                    date: nextDate,
+                    isoDate: nextDate.toString({ calendarName: 'never' }),
+                    events: [],
+                    allDayEvents: [],
+                    isToday: false,
+                    isInCurrentPeriod: false,
+                  }
+                : null,
+            )
+          }
+        }
+        workWeeks.push(currentWorkWeek)
+      }
+
+      return workWeeks
+    }
+
+    default:
+      break
+  }
+  return groups
+}
diff --git a/packages/time/src/calendar/index.ts b/packages/time/src/calendar/index.ts
new file mode 100644
index 00000000..4569bc0f
--- /dev/null
+++ b/packages/time/src/calendar/index.ts
@@ -0,0 +1,9 @@
+export * from './types'
+export * from './splitMultiDayEvents'
+export * from './generateDateRange'
+export * from './getEventProps'
+export * from './groupDaysBy'
+export * from './getTimeSlots'
+export * from './getResizeProps'
+export * from './resizeController'
+export * from './calendar'
diff --git a/packages/time/src/calendar/resizeController.ts b/packages/time/src/calendar/resizeController.ts
new file mode 100644
index 00000000..b5a54aff
--- /dev/null
+++ b/packages/time/src/calendar/resizeController.ts
@@ -0,0 +1,552 @@
+import { getTimeClient } from '../client'
+import {
+  calculateDeltaMinutesFromPixels,
+  calculateDeltaMinutesFromPixelsHorizontal,
+} from './getResizeProps'
+import type { ResizeConstraints, ResizeEdge } from './getResizeProps'
+import type { CalendarCore } from './calendar'
+import type {
+  Event,
+  EventDateTimeInput,
+  RecurrenceEditScope,
+  ResizeError,
+  Resource,
+} from './types'
+
+export interface ResizeState {
+  isResizing: boolean
+  eventId: string | null
+  edge: ResizeEdge | null
+  previewStart: string | null
+  previewEnd: string | null
+  lastValidPreviewStart: string | null
+  lastValidPreviewEnd: string | null
+  targetDayDate: string | null
+  blocked: boolean
+}
+
+export interface ResizeControllerOptions {
+  enabled?: boolean
+  containerHeight?: number
+  containerWidth?: number
+  orientation?: 'vertical' | 'horizontal'
+  constraints?: ResizeConstraints
+  onResizeStart?: (eventId: string, edge: ResizeEdge) => void
+  onResizeEnd?: (eventId: string, newStart: string, newEnd: string) => void
+  onRecurringResizeEnd?: (resize: {
+    eventId: string
+    occurrenceStart: EventDateTimeInput
+    originalStart: string
+    originalEnd: string
+    newStart: string
+    newEnd: string
+  }) => void
+  onResizeError?: (error: ResizeError) => void
+}
+
+export interface ResizeStartArgs {
+  eventId: string
+  edge: ResizeEdge
+  originalStart: string
+  originalEnd: string
+  occurrenceStart?: EventDateTimeInput
+  recurrenceScope?: RecurrenceEditScope
+  clientX: number
+  clientY: number
+  /**
+   * Optional element under the pointer (e.g. `e.target as HTMLElement`).
+   * Used to resolve the originating day column without `getBoundingClientRect`.
+   */
+  target?: HTMLElement | null
+}
+
+export type ResizeListener = () => void
+
+const INITIAL_RESIZE_STATE: ResizeState = {
+  isResizing: false,
+  eventId: null,
+  edge: null,
+  previewStart: null,
+  previewEnd: null,
+  lastValidPreviewStart: null,
+  lastValidPreviewEnd: null,
+  targetDayDate: null,
+  blocked: false,
+}
+
+const MS_PER_DAY = 1000 * 60 * 60 * 24
+
+/**
+ * Framework-agnostic controller that owns:
+ *  - resize state machine (preview, blocked, lastValid)
+ *  - rAF coalescing for `mousemove`
+ *  - day-column registry + cached rects
+ *  - last-processed dedupe + last-emitted-error dedupe
+ *  - delegation to `CalendarCore.validateResize` / `commitUpdate`
+ *
+ * UI bindings (React, Solid, etc.) only need to:
+ *  1. Subscribe to state changes and read `getSnapshot()`.
+ *  2. Forward DOM `mousedown` to `start()`, then attach `handleMouseMove` /
+ *     `handleMouseUp` to `document` (the controller exposes these as bound
+ *     methods so the same reference can be used for `addEventListener` /
+ *     `removeEventListener`).
+ *  3. Call `registerDayColumn(date, element)` from a ref callback.
+ */
+export class ResizeController<
+  TResource extends Resource,
+  TEvent extends Event<TResource>,
+> {
+  private _calendarCore: CalendarCore<TResource, TEvent>
+  private _options: ResizeControllerOptions
+
+  private _state: ResizeState = INITIAL_RESIZE_STATE
+  private _listeners = new Set<ResizeListener>()
+
+  private _dayColumns = new Map<string, HTMLElement>()
+
+  private _dayRects: Array<{ date: string; left: number; right: number }> = []
+
+  private _original: {
+    id: string
+    start: string
+    end: string
+    occurrenceStart?: EventDateTimeInput
+    recurrenceScope?: RecurrenceEditScope
+    edge: ResizeEdge
+    startY: number
+    startX: number
+    originalDayDate: string
+    currentDayDate: string
+    totalDaysInView: number
+  } | null = null
+
+  private _lastEmittedError: {
+    eventId: string
+    message: string
+    timestamp: number
+  } | null = null
+
+  private _lastProcessed: { delta: number; day: string } | null = null
+
+  private _pendingMouseEvent: MouseEvent | null = null
+  private _rafId: number | null = null
+
+  constructor(
+    calendarCore: CalendarCore<TResource, TEvent>,
+    options: ResizeControllerOptions = {},
+  ) {
+    this._calendarCore = calendarCore
+    this._options = options
+
+    this.handleMouseMove = this.handleMouseMove.bind(this)
+    this.handleMouseUp = this.handleMouseUp.bind(this)
+  }
+
+  subscribe = (listener: ResizeListener): (() => void) => {
+    this._listeners.add(listener)
+    return () => {
+      this._listeners.delete(listener)
+    }
+  }
+
+  getSnapshot = (): ResizeState => this._state
+
+  setOptions(options: ResizeControllerOptions) {
+    this._options = options
+  }
+
+  getOptions(): ResizeControllerOptions {
+    return this._options
+  }
+
+  registerDayColumn(date: string, element: HTMLElement | null) {
+    if (element) {
+      this._dayColumns.set(date, element)
+    } else {
+      this._dayColumns.delete(date)
+    }
+  }
+
+  getDayFromPoint(clientX: number): string | null {
+    const cached = this._dayRects
+    if (cached.length > 0) {
+      for (const r of cached) {
+        if (clientX >= r.left && clientX <= r.right) return r.date
+      }
+      return null
+    }
+    for (const [dayDate, element] of this._dayColumns) {
+      const rect = element.getBoundingClientRect()
+      if (clientX >= rect.left && clientX <= rect.right) return dayDate
+    }
+    return null
+  }
+
+  getDayFromElement(element: HTMLElement): string | null {
+    for (const [dayDate, dayElement] of this._dayColumns) {
+      if (dayElement.contains(element)) return dayDate
+    }
+    return null
+  }
+
+  start(args: ResizeStartArgs): boolean {
+    if (!(this._options.enabled ?? true)) return false
+
+    const dayDate =
+      (args.target ? this.getDayFromElement(args.target) : null) ??
+      this.getDayFromPoint(args.clientX)
+    if (!dayDate) return false
+
+    this._original = {
+      id: args.eventId,
+      start: args.originalStart,
+      end: args.originalEnd,
+      occurrenceStart: args.occurrenceStart,
+      recurrenceScope: args.recurrenceScope,
+      edge: args.edge,
+      startY: args.clientY,
+      startX: args.clientX,
+      originalDayDate: dayDate,
+      currentDayDate: dayDate,
+      totalDaysInView: this._calendarCore.getDaysWithEvents().length,
+    }
+
+    this._refreshDayRects()
+    this._lastProcessed = null
+
+    this._update({
+      isResizing: true,
+      eventId: args.eventId,
+      edge: args.edge,
+      previewStart: args.originalStart,
+      previewEnd: args.originalEnd,
+      lastValidPreviewStart: args.originalStart,
+      lastValidPreviewEnd: args.originalEnd,
+      targetDayDate: dayDate,
+    })
+    this._options.onResizeStart?.(args.eventId, args.edge)
+    this._attachDomListeners()
+    return true
+  }
+
+  cancel() {
+    this._cancelPendingFrame()
+    this._detachDomListeners()
+    this._original = null
+    this._lastEmittedError = null
+    this._lastProcessed = null
+    this._dayRects = []
+    this._replaceState(INITIAL_RESIZE_STATE)
+  }
+
+  destroy() {
+    this._cancelPendingFrame()
+    this._detachDomListeners()
+    this._listeners.clear()
+    this._dayColumns.clear()
+    this._dayRects = []
+    this._original = null
+    this._lastEmittedError = null
+    this._lastProcessed = null
+    this._state = INITIAL_RESIZE_STATE
+  }
+
+  handleMouseMove(e: MouseEvent) {
+    this._pendingMouseEvent = e
+    if (this._rafId !== null) return
+    this._rafId = requestAnimationFrame(() => {
+      this._rafId = null
+      const ev = this._pendingMouseEvent
+      this._pendingMouseEvent = null
+      if (ev) this._processMouseMove(ev)
+    })
+  }
+
+  /**
+   * Mouse-up handler. Auto-attached by `start()`; commits if the preview
+   * differs from the original event range, then detaches DOM listeners.
+   */
+  handleMouseUp() {
+    this._cancelPendingFrame()
+    this._detachDomListeners()
+    this._lastProcessed = null
+    this._dayRects = []
+
+    const currentState = this._state
+    const original = this._original
+
+    if (
+      currentState.eventId &&
+      currentState.previewStart &&
+      currentState.previewEnd
+    ) {
+      const hasChanged =
+        !original ||
+        currentState.previewStart !== original.start ||
+        currentState.previewEnd !== original.end
+
+      if (hasChanged) {
+        const emitResizeEnd = () => {
+          this._options.onResizeEnd?.(
+            currentState.eventId!,
+            currentState.previewStart!,
+            currentState.previewEnd!,
+          )
+        }
+
+        const commitRecurringResize = (scope: RecurrenceEditScope) => {
+          void this._calendarCore
+            .editRecurringEvent(
+              currentState.eventId!,
+              {
+                start: currentState.previewStart!,
+                end: currentState.previewEnd!,
+              } as Partial<Omit<TEvent, 'id'>>,
+              {
+                scope,
+                occurrenceStart: original!.occurrenceStart,
+              },
+            )
+            .then((result) => {
+              if (!result.success) {
+                this._options.onResizeError?.(result.error)
+                return
+              }
+              emitResizeEnd()
+            })
+        }
+
+        if (original?.occurrenceStart != null) {
+          if (!original.recurrenceScope && this._options.onRecurringResizeEnd) {
+            this._options.onRecurringResizeEnd({
+              eventId: currentState.eventId,
+              occurrenceStart: original.occurrenceStart,
+              originalStart: original.start,
+              originalEnd: original.end,
+              newStart: currentState.previewStart,
+              newEnd: currentState.previewEnd,
+            })
+          } else {
+            commitRecurringResize(original.recurrenceScope ?? 'this')
+          }
+        } else {
+          this._calendarCore.commitUpdate(currentState.eventId, {
+            start: currentState.previewStart,
+            end: currentState.previewEnd,
+          } as Partial<Omit<TEvent, 'id'>>)
+          emitResizeEnd()
+        }
+      }
+    }
+
+    this._original = null
+    this._lastEmittedError = null
+    this._replaceState(INITIAL_RESIZE_STATE)
+  }
+
+  private _refreshDayRects() {
+    const arr: Array<{ date: string; left: number; right: number }> = []
+    for (const [dayDate, element] of this._dayColumns) {
+      const rect = element.getBoundingClientRect()
+      arr.push({ date: dayDate, left: rect.left, right: rect.right })
+    }
+    this._dayRects = arr
+  }
+
+  private _cancelPendingFrame() {
+    if (this._rafId !== null) {
+      cancelAnimationFrame(this._rafId)
+      this._rafId = null
+    }
+    this._pendingMouseEvent = null
+  }
+
+  private _notify() {
+    for (const l of this._listeners) l()
+  }
+
+  private _update(patch: Partial<ResizeState>) {
+    this._state = { ...this._state, ...patch }
+    this._notify()
+  }
+
+  private _replaceState(next: ResizeState) {
+    this._state = next
+    this._notify()
+  }
+
+  /**
+   * Run a single resize iteration: derive delta, dedupe, validate, emit
+   * error (rate-limited), and update preview state.
+   */
+  private _processMouseMove(e: MouseEvent) {
+    const original = this._original
+    if (!original) return
+
+    const opts = this._options
+    const containerHeight = opts.containerHeight ?? 0
+    const containerWidth = opts.containerWidth ?? 0
+    const orientation = opts.orientation ?? 'vertical'
+    const constraints = opts.constraints
+
+    const { id, start, end, edge, startY, startX, originalDayDate } = original
+
+    let targetDayDate: string
+    let totalDeltaMinutes: number
+
+    if (orientation === 'horizontal') {
+      if (containerWidth === 0) return
+      const totalMinutesInView = original.totalDaysInView * 24 * 60
+      totalDeltaMinutes = calculateDeltaMinutesFromPixelsHorizontal(
+        e.clientX - startX,
+        containerWidth,
+        totalMinutesInView,
+      )
+      targetDayDate = originalDayDate
+    } else {
+      const deltaMinutes = calculateDeltaMinutesFromPixels(
+        e.clientY - startY,
+        containerHeight,
+      )
+
+      targetDayDate = this.getDayFromPoint(e.clientX) ?? originalDayDate
+
+      let dayOffsetMinutes = 0
+      if (targetDayDate !== originalDayDate) {
+        const originalDate = new Date(originalDayDate + 'T00:00:00')
+        const targetDate = new Date(targetDayDate + 'T00:00:00')
+        const dayDiff = Math.round(
+          (targetDate.getTime() - originalDate.getTime()) / MS_PER_DAY,
+        )
+        dayOffsetMinutes = dayDiff * 24 * 60
+        original.currentDayDate = targetDayDate
+      }
+
+      totalDeltaMinutes = deltaMinutes + dayOffsetMinutes
+    }
+
+    const snapToMinutes = constraints?.snapToMinutes ?? 1
+    const snappedDelta =
+      snapToMinutes > 1
+        ? Math.round(totalDeltaMinutes / snapToMinutes) * snapToMinutes
+        : totalDeltaMinutes
+    const last = this._lastProcessed
+    if (last && last.delta === snappedDelta && last.day === targetDayDate) {
+      return
+    }
+    this._lastProcessed = { delta: snappedDelta, day: targetDayDate }
+
+    const validation = this._calendarCore.validateResize({
+      eventId: id,
+      originalStart: start,
+      originalEnd: end,
+      edge,
+      totalDeltaMinutes,
+      targetDayDate,
+      originalDayDate,
+      occurrenceStart: original.occurrenceStart,
+      constraints,
+    })
+
+    if (validation.blocked && validation.error) {
+      this._maybeEmitError(id, start, end, validation.error)
+    } else {
+      this._lastEmittedError = null
+    }
+
+    const currentState = this._state
+    const effectivePreviewStart = validation.blocked
+      ? (currentState.lastValidPreviewStart ?? start)
+      : validation.result.start
+    const effectivePreviewEnd = validation.blocked
+      ? (currentState.lastValidPreviewEnd ?? end)
+      : validation.result.end
+
+    this._update({
+      eventId: id,
+      previewStart: effectivePreviewStart,
+      previewEnd: effectivePreviewEnd,
+      ...(!validation.blocked && {
+        lastValidPreviewStart: validation.result.start,
+        lastValidPreviewEnd: validation.result.end,
+      }),
+      targetDayDate: validation.targetDayDate,
+      blocked: validation.blocked,
+    })
+  }
+
+  /**
+   * Emit a resize error via TimeClient + onResizeError callback, but rate-limit
+   * to avoid flooding when the user dwells in an invalid area: the same
+   * `(eventId, message)` pair is suppressed for 500ms.
+   */
+  private _maybeEmitError(
+    eventId: string,
+    originalStart: string,
+    originalEnd: string,
+    error: {
+      reason: ResizeError['reason']
+      message: string
+      conflicts: NonNullable<ResizeError['conflicts']>
+    },
+  ) {
+    const now = Date.now()
+    const lastError = this._lastEmittedError
+    const shouldEmit =
+      !lastError ||
+      lastError.eventId !== eventId ||
+      lastError.message !== error.message ||
+      now - lastError.timestamp > 500
+    if (!shouldEmit) return
+
+    const event = this._calendarCore.getEvents().find((ev) => ev.id === eventId)
+    const eventTitle = event?.title ?? 'Unknown Event'
+    const conflicts = error.conflicts.length > 0 ? error.conflicts : undefined
+
+    const resizeError: ResizeError = {
+      eventId,
+      eventTitle,
+      reason: error.reason,
+      message: error.message,
+      originalStart,
+      originalEnd,
+      conflicts,
+    }
+
+    getTimeClient().emit('event:update:error', {
+      eventId,
+      eventTitle,
+      reason: error.reason,
+      message: error.message,
+      originalStart,
+      originalEnd,
+      conflicts,
+    })
+
+    this._options.onResizeError?.(resizeError)
+
+    this._lastEmittedError = {
+      eventId,
+      message: error.message,
+      timestamp: now,
+    }
+  }
+
+  private _domListenersAttached = false
+
+  private _attachDomListeners() {
+    if (this._domListenersAttached) return
+    if (typeof document === 'undefined') return
+    document.addEventListener('mousemove', this.handleMouseMove)
+    document.addEventListener('mouseup', this.handleMouseUp)
+    this._domListenersAttached = true
+  }
+
+  private _detachDomListeners() {
+    if (!this._domListenersAttached) return
+    if (typeof document === 'undefined') return
+    document.removeEventListener('mousemove', this.handleMouseMove)
+    document.removeEventListener('mouseup', this.handleMouseUp)
+    this._domListenersAttached = false
+  }
+}
diff --git a/packages/time/src/calendar/splitMultiDayEvents.ts b/packages/time/src/calendar/splitMultiDayEvents.ts
new file mode 100644
index 00000000..7cd9bb51
--- /dev/null
+++ b/packages/time/src/calendar/splitMultiDayEvents.ts
@@ -0,0 +1,44 @@
+import { Temporal } from '@js-temporal/polyfill'
+import type { Event, Resource } from './types'
+import { endOf, startOf, toPlainDateTimeString } from '~/date'
+
+export const splitMultiDayEvents = <
+  TResource extends Resource = Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+>(
+  event: TEvent,
+  timeZone: Temporal.TimeZoneLike,
+): Array<TEvent> => {
+  const startDate = Temporal.PlainDateTime.from(
+    toPlainDateTimeString(event.start),
+  ).toZonedDateTime(timeZone)
+  const endDate = Temporal.PlainDateTime.from(
+    toPlainDateTimeString(event.end),
+  ).toZonedDateTime(timeZone)
+  const events: Array<TEvent> = []
+
+  let currentDay = startDate
+  while (Temporal.ZonedDateTime.compare(currentDay, endDate) < 0) {
+    const startOfDay = startOf(currentDay, { unit: 'day' }).asZonedDateTime()
+    const endOfDay = endOf(currentDay, { unit: 'day' }).asZonedDateTime()
+
+    const eventStart =
+      Temporal.ZonedDateTime.compare(currentDay, startDate) === 0
+        ? startDate
+        : startOfDay
+    const eventEnd =
+      Temporal.ZonedDateTime.compare(endDate, endOfDay) < 0 ? endDate : endOfDay
+
+    events.push({
+      ...event,
+      start: eventStart.toPlainDateTime().toString(),
+      end: eventEnd.toPlainDateTime().toString(),
+      _originalStart: event.start,
+      _originalEnd: event.end,
+    })
+
+    currentDay = startOfDay.add({ days: 1 })
+  }
+
+  return events
+}
diff --git a/packages/time/src/calendar/tests/calendar.test.ts b/packages/time/src/calendar/tests/calendar.test.ts
new file mode 100644
index 00000000..a0acc7c7
--- /dev/null
+++ b/packages/time/src/calendar/tests/calendar.test.ts
@@ -0,0 +1,5596 @@
+import { assert, beforeEach, describe, expect, test, vi } from 'vitest'
+import { CalendarCore } from '../calendar'
+import { calculateSegmentResizePreview } from '../getResizeProps'
+import type { Event, Resource } from '../types'
+
+const { emitSpy } = vi.hoisted(() => ({ emitSpy: vi.fn() }))
+vi.mock('../../client', () => ({
+  getTimeClient: () => ({ emit: emitSpy }),
+}))
+
+type TestResource = Resource
+type TestEvent = Event<TestResource>
+
+function createCalendar(
+  overrides: Partial<
+    ConstructorParameters<typeof CalendarCore<TestResource, TestEvent>>[0]
+  > = {},
+) {
+  return new CalendarCore<TestResource, TestEvent>({
+    viewMode: { value: 1, unit: 'week' },
+    timeZone: 'UTC',
+    ...overrides,
+  })
+}
+
+const weekdayResource: TestResource = {
+  id: 'r1',
+  label: 'Weekday Room',
+  capacity: [2],
+  availability: [
+    { weekdays: [1, 2, 3, 4, 5], startTime: '08:00', endTime: '17:00' },
+  ],
+}
+
+const afternoonResource: TestResource = {
+  id: 'r2',
+  label: 'Afternoon Room',
+  capacity: [1],
+  availability: [
+    { weekdays: [1, 2, 3, 4, 5], startTime: '12:00', endTime: '18:00' },
+  ],
+}
+
+const allDayResource: TestResource = {
+  id: 'r3',
+  label: 'All Day Room',
+  availability: [
+    { weekdays: [1, 2, 3, 4, 5, 6, 7], startTime: '00:00', endTime: '24:00' },
+  ],
+}
+
+const noAvailabilityResource: TestResource = {
+  id: 'r4',
+  label: 'No Availability Room',
+}
+
+const DATE_MON = '2024-03-18'
+const DATE_TUE = '2024-03-19'
+const DATE_WED = '2024-03-20'
+
+describe('CalendarCore', () => {
+  beforeEach(() => {
+    emitSpy.mockClear()
+  })
+
+  describe('constructor', () => {
+    test('initializes with events and resources', () => {
+      const events: Array<TestEvent> = [
+        {
+          id: 'e1',
+          title: 'Event 1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        },
+      ]
+
+      const cal = createCalendar({
+        events,
+        resources: [weekdayResource],
+      })
+
+      expect(cal.getEvents()).toHaveLength(1)
+      expect(cal.getEvents()[0]?.id).toBe('e1')
+    })
+
+    test('normalizes date-only event start/end to full datetime', () => {
+      const events: Array<TestEvent> = [
+        {
+          id: 'e1',
+          title: 'Event',
+          start: DATE_MON,
+          end: DATE_TUE,
+        },
+      ]
+
+      const cal = createCalendar({ events })
+      const e = cal.getEvents()[0]!
+      expect(e.start).toBe(`${DATE_MON}T00:00:00`)
+      expect(e.end).toBe(`${DATE_TUE}T00:00:00`)
+    })
+
+    test('normalizes partial datetime event start/end', () => {
+      const events: Array<TestEvent> = [
+        {
+          id: 'e1',
+          title: 'Event',
+          start: `${DATE_MON}T09`,
+          end: `${DATE_MON}T10`,
+        },
+      ]
+
+      const cal = createCalendar({ events })
+      const e = cal.getEvents()[0]!
+      expect(e.start).toBe(`${DATE_MON}T09:00:00`)
+      expect(e.end).toBe(`${DATE_MON}T10:00:00`)
+    })
+
+    test('normalizes Date objects in event start/end', () => {
+      const startDate = new Date(2024, 2, 18, 9, 0, 0)
+      const endDate = new Date(2024, 2, 18, 10, 0, 0)
+
+      const events: Array<TestEvent> = [
+        {
+          id: 'e1',
+          title: 'Event',
+          start: startDate,
+          end: endDate,
+        },
+      ]
+
+      const cal = createCalendar({ events })
+      const e = cal.getEvents()[0]!
+      expect(e.start).toBe('2024-03-18T09:00:00')
+      expect(e.end).toBe('2024-03-18T10:00:00')
+    })
+  })
+
+  describe('getEventsByDate', () => {
+    test('returns events matching the date', () => {
+      const events: Array<TestEvent> = [
+        {
+          id: 'e1',
+          title: 'Event 1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        },
+        {
+          id: 'e2',
+          title: 'Event 2',
+          start: `${DATE_TUE}T09:00:00`,
+          end: `${DATE_TUE}T10:00:00`,
+        },
+      ]
+
+      const cal = createCalendar({ events })
+      const monEvents = cal.getEventsByDate(DATE_MON)
+      expect(monEvents).toHaveLength(1)
+      expect(monEvents[0]!.id).toBe('e1')
+    })
+
+    test('returns empty array for date without events', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_TUE}T09:00:00`,
+            end: `${DATE_TUE}T10:00:00`,
+          },
+        ],
+      })
+
+      expect(cal.getEventsByDate(DATE_MON)).toHaveLength(0)
+    })
+
+    test('splits multi-day events across dates', () => {
+      const events: Array<TestEvent> = [
+        {
+          id: 'e1',
+          title: 'Event',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_TUE}T10:00:00`,
+        },
+      ]
+
+      const cal = createCalendar({ events })
+      const monEvents = cal.getEventsByDate(DATE_MON)
+      const tueEvents = cal.getEventsByDate(DATE_TUE)
+
+      expect(monEvents).toHaveLength(1)
+      expect(tueEvents).toHaveLength(1)
+      expect(monEvents[0]!.id).toBe('e1')
+      expect(tueEvents[0]!.id).toBe('e1')
+    })
+
+    test('returns empty when no events configured', () => {
+      const cal = createCalendar({ events: [] })
+      expect(cal.getEventsByDate(DATE_MON)).toHaveLength(0)
+    })
+  })
+
+  describe('commitAdd', () => {
+    test('adds an event to an empty calendar', () => {
+      const cal = createCalendar()
+      const event: TestEvent = {
+        id: 'e1',
+        title: 'New Event',
+        start: `${DATE_MON}T09:00:00`,
+        end: `${DATE_MON}T10:00:00`,
+      }
+
+      cal.commitAdd(event)
+      expect(cal.getEvents()).toHaveLength(1)
+      expect(cal.getEvents()[0]!.id).toBe('e1')
+    })
+
+    test('adds an event to existing events', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Existing',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ],
+      })
+
+      cal.commitAdd({
+        id: 'e2',
+        title: 'New',
+        start: `${DATE_MON}T11:00:00`,
+        end: `${DATE_MON}T12:00:00`,
+      })
+
+      expect(cal.getEvents()).toHaveLength(2)
+    })
+
+    test('normalizes date-only start/end when adding event', () => {
+      const cal = createCalendar()
+      cal.commitAdd({
+        id: 'e1',
+        title: 'Event',
+        start: DATE_MON,
+        end: DATE_TUE,
+      })
+
+      const e = cal.getEvents()[0]!
+      expect(e.start).toBe(`${DATE_MON}T00:00:00`)
+      expect(e.end).toBe(`${DATE_TUE}T00:00:00`)
+    })
+
+    test('normalizes Date objects when adding event', () => {
+      const cal = createCalendar()
+      cal.commitAdd({
+        id: 'e1',
+        title: 'Event',
+        start: new Date(2024, 2, 18, 9, 0, 0),
+        end: new Date(2024, 2, 18, 10, 0, 0),
+      })
+
+      const e = cal.getEvents()[0]!
+      expect(e.start).toBe('2024-03-18T09:00:00')
+      expect(e.end).toBe('2024-03-18T10:00:00')
+    })
+  })
+
+  describe('commitUpdate', () => {
+    test('updates an existing event', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Original',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ],
+      })
+
+      cal.commitUpdate('e1', { title: 'Updated' })
+      expect(cal.getEvents()[0]!.title).toBe('Updated')
+    })
+
+    test('updates start/end times', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ],
+      })
+
+      cal.commitUpdate('e1', {
+        start: `${DATE_MON}T10:00:00`,
+        end: `${DATE_MON}T11:00:00`,
+      })
+
+      const e = cal.getEvents()[0]!
+      expect(e.start).toBe(`${DATE_MON}T10:00:00`)
+      expect(e.end).toBe(`${DATE_MON}T11:00:00`)
+    })
+
+    test('normalizes date-only start/end when updating event', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ],
+      })
+
+      cal.commitUpdate('e1', {
+        start: DATE_TUE,
+        end: `${DATE_TUE}T12:00:00`,
+      })
+
+      const e = cal.getEvents()[0]!
+      expect(e.start).toBe(`${DATE_TUE}T00:00:00`)
+      expect(e.end).toBe(`${DATE_TUE}T12:00:00`)
+    })
+
+    test('normalizes Date objects when updating event', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ],
+      })
+
+      cal.commitUpdate('e1', {
+        start: new Date(2024, 2, 19, 10, 0, 0),
+        end: new Date(2024, 2, 19, 11, 0, 0),
+      })
+
+      const e = cal.getEvents()[0]!
+      expect(e.start).toBe('2024-03-19T10:00:00')
+      expect(e.end).toBe('2024-03-19T11:00:00')
+    })
+
+    test('does nothing when event not found', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Original',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ],
+      })
+
+      cal.commitUpdate('nonexistent', { title: 'Updated' })
+      expect(cal.getEvents()).toHaveLength(1)
+      expect(cal.getEvents()[0]!.title).toBe('Original')
+    })
+
+    test('does nothing when events is null', () => {
+      const cal = createCalendar()
+      cal.commitUpdate('e1', { title: 'Updated' })
+      expect(cal.getEvents()).toHaveLength(0)
+    })
+  })
+
+  describe('removeEvent', () => {
+    test('removes an existing event', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event 1',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+          {
+            id: 'e2',
+            title: 'Event 2',
+            start: `${DATE_MON}T11:00:00`,
+            end: `${DATE_MON}T12:00:00`,
+          },
+        ],
+      })
+
+      cal.removeEvent('e1')
+      expect(cal.getEvents()).toHaveLength(1)
+      expect(cal.getEvents()[0]!.id).toBe('e2')
+    })
+
+    test('does nothing when event not found', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ],
+      })
+
+      cal.removeEvent('nonexistent')
+      expect(cal.getEvents()).toHaveLength(1)
+    })
+
+    test('does nothing when events is null', () => {
+      const cal = createCalendar()
+      expect(() => cal.removeEvent('e1')).not.toThrow()
+    })
+  })
+
+  describe('getUnavailableRanges', () => {
+    test('returns empty when no resources', () => {
+      const cal = createCalendar({ resources: [] })
+      expect(
+        cal.getUnavailableRanges(DATE_MON, { containerHeight: 800 }),
+      ).toHaveLength(0)
+    })
+
+    test('returns full day unavailable when resource has no availability for that weekday', () => {
+      const weekendOnlyResource: TestResource = {
+        id: 'r-wknd',
+        label: 'Weekend Only',
+        availability: [
+          { weekdays: [6, 7], startTime: '09:00', endTime: '17:00' },
+        ],
+      }
+
+      const cal = createCalendar({
+        resources: [weekendOnlyResource],
+      })
+
+      const ranges = cal.getUnavailableRanges(DATE_MON, {
+        containerHeight: 800,
+        resourceIds: ['r-wknd'],
+      })
+
+      expect(ranges).toHaveLength(1)
+      expect(ranges[0]!.top).toBe(0)
+      expect(ranges[0]!.height).toBe(800)
+    })
+
+    test('returns unavailable ranges before and after availability window', () => {
+      const cal = createCalendar({
+        resources: [weekdayResource],
+      })
+
+      const ranges = cal.getUnavailableRanges(DATE_MON, {
+        containerHeight: 540,
+        resourceIds: ['r1'],
+      })
+
+      expect(ranges).toHaveLength(2)
+      expect(ranges[0]).toMatchObject({
+        top: 0,
+        startTime: '00:00',
+        endTime: '08:00',
+      })
+      expect(ranges[1]).toMatchObject({
+        startTime: '17:00',
+        endTime: '24:00',
+      })
+    })
+
+    test('merges overlapping availability from multiple resources', () => {
+      const cal = createCalendar({
+        resources: [weekdayResource, afternoonResource],
+      })
+
+      const ranges = cal.getUnavailableRanges(DATE_MON, {
+        containerHeight: 540,
+      })
+
+      expect(ranges).toHaveLength(2)
+    })
+
+    test('filters by resourceIds when provided', () => {
+      const cal = createCalendar({
+        resources: [weekdayResource, afternoonResource],
+      })
+
+      const ranges = cal.getUnavailableRanges(DATE_MON, {
+        containerHeight: 540,
+        resourceIds: ['r2'],
+      })
+
+      expect(ranges).toHaveLength(2)
+    })
+
+    test('returns no unavailable ranges for all-day resource', () => {
+      const cal = createCalendar({
+        resources: [allDayResource],
+      })
+
+      const ranges = cal.getUnavailableRanges(DATE_MON, {
+        containerHeight: 800,
+        resourceIds: ['r3'],
+      })
+
+      expect(ranges).toHaveLength(0)
+    })
+
+    test('returns full day when resource has no availability config', () => {
+      const cal = createCalendar({
+        resources: [noAvailabilityResource],
+      })
+
+      const ranges = cal.getUnavailableRanges(DATE_MON, {
+        containerHeight: 800,
+        resourceIds: ['r4'],
+      })
+
+      expect(ranges).toHaveLength(1)
+      expect(ranges[0]!.height).toBe(800)
+    })
+
+    test('scales pixel positions to containerHeight', () => {
+      const cal = createCalendar({
+        resources: [weekdayResource],
+      })
+
+      const ranges = cal.getUnavailableRanges(DATE_MON, {
+        containerHeight: 540,
+        resourceIds: ['r1'],
+      })
+
+      expect(ranges[0]!.height).toBeLessThan(540)
+    })
+  })
+
+  describe('getUnavailabilityDetails', () => {
+    test('returns empty when no resources', () => {
+      const cal = createCalendar({ resources: [] })
+      expect(cal.getUnavailabilityDetails(DATE_MON, 0, 1440)).toHaveLength(0)
+    })
+
+    test('returns no-availability for resource without availability config', () => {
+      const cal = createCalendar({
+        resources: [noAvailabilityResource],
+      })
+
+      const details = cal.getUnavailabilityDetails(DATE_MON, 0, 1440, {
+        resourceIds: ['r4'],
+      })
+
+      expect(details).toHaveLength(1)
+      expect(details[0]!.reason).toBe('no-availability')
+      expect(details[0]!.resourceId).toBe('r4')
+    })
+
+    test('returns outside-hours when resource not available on that weekday', () => {
+      const weekendResource: TestResource = {
+        id: 'r-wknd',
+        label: 'Weekend Only',
+        availability: [
+          { weekdays: [6, 7], startTime: '09:00', endTime: '17:00' },
+        ],
+      }
+
+      const cal = createCalendar({
+        resources: [weekendResource],
+      })
+
+      const details = cal.getUnavailabilityDetails(DATE_MON, 9 * 60, 10 * 60, {
+        resourceIds: ['r-wknd'],
+      })
+
+      expect(details).toHaveLength(1)
+      expect(details[0]!.reason).toBe('outside-hours')
+      expect(details[0]!.resourceId).toBe('r-wknd')
+    })
+
+    test('returns outside-hours when time range exceeds availability window', () => {
+      const cal = createCalendar({
+        resources: [weekdayResource],
+      })
+
+      const details = cal.getUnavailabilityDetails(DATE_MON, 7 * 60, 10 * 60, {
+        resourceIds: ['r1'],
+      })
+
+      expect(details).toHaveLength(1)
+      expect(details[0]!.reason).toBe('outside-hours')
+      expect(details[0]!.resourceId).toBe('r1')
+    })
+
+    test('returns empty when time range is within availability', () => {
+      const cal = createCalendar({
+        resources: [weekdayResource],
+      })
+
+      const details = cal.getUnavailabilityDetails(DATE_MON, 9 * 60, 10 * 60, {
+        resourceIds: ['r1'],
+      })
+
+      expect(details).toHaveLength(0)
+    })
+
+    test('checks multiple resources independently', () => {
+      const cal = createCalendar({
+        resources: [weekdayResource, noAvailabilityResource],
+      })
+
+      const details = cal.getUnavailabilityDetails(DATE_MON, 9 * 60, 10 * 60, {
+        resourceIds: ['r1', 'r4'],
+      })
+
+      expect(details).toHaveLength(1)
+      expect(details[0]!.resourceId).toBe('r4')
+    })
+
+    test('uses all resources when resourceIds not specified', () => {
+      const cal = createCalendar({
+        resources: [weekdayResource, noAvailabilityResource],
+      })
+
+      const details = cal.getUnavailabilityDetails(DATE_MON, 9 * 60, 10 * 60)
+
+      expect(details).toHaveLength(1)
+    })
+  })
+
+  describe('validateResize', () => {
+    const baseResizeOptions = {
+      constraints: { snapToMinutes: 15, minDurationMinutes: 15 },
+    }
+
+    describe('same-day resize within availability', () => {
+      test('allows extending bottom edge within available time', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T09:00:00`,
+          originalEnd: `${DATE_MON}T10:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 60,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(false)
+      })
+
+      test('allows shrinking top edge within available time', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T09:00:00`,
+          originalEnd: `${DATE_MON}T11:00:00`,
+          edge: 'top',
+          totalDeltaMinutes: -60,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(false)
+      })
+    })
+
+    describe('same-day resize blocked by availability', () => {
+      test('blocks extending bottom edge into unavailable time', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T16:00:00`,
+              end: `${DATE_MON}T17:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T16:00:00`,
+          originalEnd: `${DATE_MON}T17:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 60,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+
+      test('blocks extending top edge into unavailable time', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T09:00:00`,
+          originalEnd: `${DATE_MON}T10:00:00`,
+          edge: 'top',
+          totalDeltaMinutes: -90,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+    })
+
+    describe('capacity constraints', () => {
+      test('allows resize when event already coexists with other events at capacity', () => {
+        const resource: TestResource = {
+          id: 'r-cap',
+          label: 'Capacity 1',
+          capacity: [1],
+          availability: [
+            { weekdays: [1, 2, 3, 4, 5], startTime: '09:00', endTime: '17:00' },
+          ],
+        }
+
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [resource],
+            },
+            {
+              id: 'e2',
+              title: 'E2',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [resource],
+            },
+          ],
+          resources: [resource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e2',
+          originalStart: `${DATE_MON}T10:00:00`,
+          originalEnd: `${DATE_MON}T11:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 60,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(false)
+      })
+
+      test('blocks resize when it would create NEW capacity conflicts', () => {
+        const resource: TestResource = {
+          id: 'r-cap',
+          label: 'Capacity 1',
+          capacity: [1],
+          availability: [
+            { weekdays: [1, 2, 3, 4, 5], startTime: '09:00', endTime: '17:00' },
+          ],
+        }
+
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [resource],
+            },
+            {
+              id: 'e2',
+              title: 'E2',
+              start: `${DATE_MON}T12:00:00`,
+              end: `${DATE_MON}T13:00:00`,
+              resources: [resource],
+            },
+            {
+              id: 'e3',
+              title: 'E3',
+              start: `${DATE_MON}T14:00:00`,
+              end: `${DATE_MON}T15:00:00`,
+              resources: [resource],
+            },
+          ],
+          resources: [resource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e3',
+          originalStart: `${DATE_MON}T14:00:00`,
+          originalEnd: `${DATE_MON}T15:00:00`,
+          edge: 'top',
+          totalDeltaMinutes: -180,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        assert(result.blocked)
+        expect(result.error?.reason).toBe('unavailable-time')
+      })
+
+      test('allows resize when capacity is not exceeded', () => {
+        const resource: TestResource = {
+          id: 'r-cap',
+          label: 'Capacity 3',
+          capacity: [3],
+          availability: [
+            { weekdays: [1, 2, 3, 4, 5], startTime: '09:00', endTime: '17:00' },
+          ],
+        }
+
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [resource],
+            },
+            {
+              id: 'e2',
+              title: 'E2',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [resource],
+            },
+            {
+              id: 'e3',
+              title: 'E3',
+              start: `${DATE_MON}T14:00:00`,
+              end: `${DATE_MON}T15:00:00`,
+              resources: [resource],
+            },
+          ],
+          resources: [resource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e3',
+          originalStart: `${DATE_MON}T14:00:00`,
+          originalEnd: `${DATE_MON}T15:00:00`,
+          edge: 'top',
+          totalDeltaMinutes: -240,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(false)
+      })
+    })
+
+    describe('event without resources', () => {
+      test('allows resize freely when event has no resources', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T09:00:00`,
+          originalEnd: `${DATE_MON}T10:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 120,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(false)
+      })
+    })
+
+    describe('zero delta', () => {
+      test('returns original times when delta is zero', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T09:00:00`,
+          originalEnd: `${DATE_MON}T10:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 0,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(false)
+        expect(result.result.start).toBe(`${DATE_MON}T09:00:00`)
+        expect(result.result.end).toBe(`${DATE_MON}T10:00:00`)
+      })
+    })
+
+    describe('blocked resize returns original day date', () => {
+      test('targetDayDate falls back to originalDayDate when blocked', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T16:00:00`,
+              end: `${DATE_MON}T17:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T16:00:00`,
+          originalEnd: `${DATE_MON}T17:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 60,
+          targetDayDate: '2024-03-20',
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.targetDayDate).toBe(DATE_MON)
+      })
+    })
+
+    describe('cross-day resize (top edge to earlier day)', () => {
+      test('blocks when target day has unavailable time at the target range', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_TUE}T09:00:00`,
+              end: `${DATE_TUE}T10:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_TUE}T09:00:00`,
+          originalEnd: `${DATE_TUE}T10:00:00`,
+          edge: 'top',
+          totalDeltaMinutes: -480,
+          targetDayDate: '2024-03-15',
+          originalDayDate: DATE_TUE,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+
+      test('blocks when source day has unavailable time before event start', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T07:00:00`,
+              end: `${DATE_MON}T08:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T07:00:00`,
+          originalEnd: `${DATE_MON}T08:00:00`,
+          edge: 'top',
+          totalDeltaMinutes: -60,
+          targetDayDate: '2024-03-15',
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+    })
+
+    describe('cross-day resize (bottom edge to later day)', () => {
+      test('blocks when target day has unavailable time at the target range', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_TUE}T09:00:00`,
+              end: `${DATE_TUE}T10:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_TUE}T09:00:00`,
+          originalEnd: `${DATE_TUE}T10:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 480,
+          targetDayDate: '2024-03-22',
+          originalDayDate: DATE_TUE,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+
+      test('blocks when source day has unavailable time after event end', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T16:00:00`,
+              end: `${DATE_MON}T17:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T16:00:00`,
+          originalEnd: `${DATE_MON}T17:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 60,
+          targetDayDate: DATE_TUE,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+    })
+
+    describe('result shape', () => {
+      test('returns valid result structure when not blocked', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T09:00:00`,
+          originalEnd: `${DATE_MON}T10:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 60,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(false)
+        expect(result.targetDayDate).toBe(DATE_MON)
+        expect(result.result).toBeDefined()
+        expect(result.result.start).toBeDefined()
+        expect(result.result.end).toBeDefined()
+      })
+
+      test('returns valid error structure when blocked', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T16:00:00`,
+              end: `${DATE_MON}T17:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T16:00:00`,
+          originalEnd: `${DATE_MON}T17:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 60,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(true)
+        expect(result.error).toBeDefined()
+      })
+    })
+
+    describe('multiple resources on one event', () => {
+      test('blocks when any resource is unavailable for the new range', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource, afternoonResource],
+            },
+          ],
+          resources: [weekdayResource, afternoonResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T09:00:00`,
+          originalEnd: `${DATE_MON}T10:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 480,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+
+      test('allows when all resources are available for the new range', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T13:00:00`,
+              end: `${DATE_MON}T14:00:00`,
+              resources: [weekdayResource, afternoonResource],
+            },
+          ],
+          resources: [weekdayResource, afternoonResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T13:00:00`,
+          originalEnd: `${DATE_MON}T14:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 60,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(result.blocked).toBe(false)
+      })
+    })
+
+    describe('no constraints provided', () => {
+      test('works with default snap of 1 minute', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Event',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateResize({
+          eventId: 'e1',
+          originalStart: `${DATE_MON}T09:00:00`,
+          originalEnd: `${DATE_MON}T10:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 1,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+        })
+
+        expect(result.blocked).toBe(false)
+      })
+    })
+  })
+
+  describe('navigation', () => {
+    test('changeViewMode updates the visible mode', () => {
+      const cal = createCalendar()
+      cal.changeViewMode({ value: 2, unit: 'week' })
+      expect(cal.getDaysWithEvents().length).toBeGreaterThan(0)
+    })
+
+    test('goToSpecificPeriod accepts an ISO date string', () => {
+      const cal = createCalendar()
+      expect(() => cal.goToSpecificPeriod('2024-06-01')).not.toThrow()
+    })
+
+    test('goToNextPeriod and goToPreviousPeriod do not throw', () => {
+      const cal = createCalendar({
+        viewMode: { value: 1, unit: 'week' },
+      })
+      expect(() => cal.goToNextPeriod()).not.toThrow()
+      expect(() => cal.goToPreviousPeriod()).not.toThrow()
+    })
+
+    test('canGoPreviousPeriod returns true without range', () => {
+      const cal = createCalendar()
+      expect(cal.canGoPreviousPeriod()).toBe(true)
+    })
+
+    test('canGoNextPeriod returns true without range', () => {
+      const cal = createCalendar()
+      expect(cal.canGoNextPeriod()).toBe(true)
+    })
+
+    describe('goToNextOccurrence / goToPreviousOccurrence', () => {
+      const recurringEvent: TestEvent = {
+        id: 'rec',
+        title: 'Recurring',
+        start: '2025-06-02T09:00:00',
+        end: '2025-06-02T10:00:00',
+        recurrence: { frequency: 'weekly', interval: 1 },
+      }
+
+      const nonRecurringEvent: TestEvent = {
+        id: 'plain',
+        title: 'Plain',
+        start: '2025-06-02T09:00:00',
+        end: '2025-06-02T10:00:00',
+      }
+
+      test('goToNextOccurrence navigates to next weekly occurrence', () => {
+        const cal = createCalendar({ events: [recurringEvent] })
+        cal.goToSpecificPeriod('2025-06-02')
+        cal.goToNextOccurrence('rec')
+        expect(
+          cal.store.state.activeDate.toString({ calendarName: 'never' }),
+        ).toBe('2025-06-09')
+      })
+
+      test('goToNextOccurrence is no-op for non-recurring event', () => {
+        const cal = createCalendar({ events: [nonRecurringEvent] })
+        cal.goToSpecificPeriod('2025-06-02')
+        cal.goToNextOccurrence('plain')
+        expect(
+          cal.store.state.activeDate.toString({ calendarName: 'never' }),
+        ).toBe('2025-06-02')
+      })
+
+      test('goToNextOccurrence accepts occurrence id and resolves master', () => {
+        const cal = createCalendar({ events: [recurringEvent] })
+        cal.goToSpecificPeriod('2025-06-02')
+        cal.goToNextOccurrence('rec_1')
+        expect(
+          cal.store.state.activeDate.toString({ calendarName: 'never' }),
+        ).toBe('2025-06-09')
+      })
+
+      test('goToPreviousOccurrence navigates to previous weekly occurrence', () => {
+        const cal = createCalendar({ events: [recurringEvent] })
+        cal.goToSpecificPeriod('2025-06-16')
+        cal.goToPreviousOccurrence('rec')
+        expect(
+          cal.store.state.activeDate.toString({ calendarName: 'never' }),
+        ).toBe('2025-06-09')
+      })
+
+      test('goToPreviousOccurrence is no-op when already at master start', () => {
+        const cal = createCalendar({ events: [recurringEvent] })
+        cal.goToSpecificPeriod('2025-06-02')
+        cal.goToPreviousOccurrence('rec')
+        expect(
+          cal.store.state.activeDate.toString({ calendarName: 'never' }),
+        ).toBe('2025-06-02')
+      })
+
+      test('goToPreviousOccurrence from occurrence id resolves master', () => {
+        const cal = createCalendar({ events: [recurringEvent] })
+        cal.goToSpecificPeriod('2025-06-09')
+        cal.goToPreviousOccurrence('rec_1')
+        expect(
+          cal.store.state.activeDate.toString({ calendarName: 'never' }),
+        ).toBe('2025-06-02')
+      })
+    })
+  })
+
+  describe('getDaysNames', () => {
+    test('returns 7 day names', () => {
+      const cal = createCalendar({ locale: 'en-US' })
+      const names = cal.getDaysNames()
+      expect(names).toHaveLength(7)
+    })
+
+    test('returns long day names', () => {
+      const cal = createCalendar({ locale: 'en-US' })
+      const names = cal.getDaysNames('long')
+      expect(names).toContain('Sunday')
+    })
+  })
+
+  describe('getTimeSlots', () => {
+    test('returns time slots for the day', () => {
+      const cal = createCalendar()
+      const slots = cal.getTimeSlots()
+      expect(slots).toBeDefined()
+      expect(Array.isArray(slots)).toBe(true)
+    })
+  })
+
+  describe('getDaysWithEvents', () => {
+    test('returns days array with events mapped to dates', () => {
+      const cal = createCalendar({
+        viewMode: { value: 1, unit: 'week' },
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ],
+      })
+
+      cal.goToSpecificPeriod(DATE_MON)
+      const days = cal.getDaysWithEvents()
+      const targetDay = days.find((d) => d.isoDate === DATE_MON)
+
+      expect(targetDay).toBeDefined()
+      expect(targetDay!.events).toHaveLength(1)
+    })
+
+    test('marks today correctly', () => {
+      const cal = createCalendar({
+        viewMode: { value: 1, unit: 'week' },
+      })
+
+      const days = cal.getDaysWithEvents()
+      const todayCount = days.filter((d) => d.isToday).length
+
+      expect(todayCount).toBe(1)
+    })
+  })
+
+  describe('validateResize - horizontal timeline (multi-day events)', () => {
+    const baseResizeOptions = {
+      constraints: { snapToMinutes: 15, minDurationMinutes: 15 },
+    }
+
+    test('blocks extending right edge of multi-day event into unavailable hours', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_TUE}T10:00:00`,
+            resources: [weekdayResource],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'e1',
+        originalStart: `${DATE_MON}T09:00:00`,
+        originalEnd: `${DATE_TUE}T10:00:00`,
+        edge: 'right',
+        totalDeltaMinutes: 480,
+        targetDayDate: DATE_TUE,
+        originalDayDate: DATE_TUE,
+        ...baseResizeOptions,
+      })
+
+      expect(result.blocked).toBe(true)
+    })
+
+    test('allows extending right edge of multi-day event within available hours', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_TUE}T10:00:00`,
+            resources: [weekdayResource],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'e1',
+        originalStart: `${DATE_MON}T09:00:00`,
+        originalEnd: `${DATE_TUE}T10:00:00`,
+        edge: 'right',
+        totalDeltaMinutes: 60,
+        targetDayDate: DATE_TUE,
+        originalDayDate: DATE_TUE,
+        ...baseResizeOptions,
+      })
+
+      expect(result.blocked).toBe(false)
+    })
+
+    test('blocks extending left edge of multi-day event into unavailable hours', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_TUE}T09:00:00`,
+            end: `${DATE_TUE}T17:00:00`,
+            resources: [weekdayResource],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'e1',
+        originalStart: `${DATE_TUE}T09:00:00`,
+        originalEnd: `${DATE_TUE}T17:00:00`,
+        edge: 'left',
+        totalDeltaMinutes: -480,
+        targetDayDate: DATE_MON,
+        originalDayDate: DATE_TUE,
+        ...baseResizeOptions,
+      })
+
+      expect(result.blocked).toBe(true)
+    })
+
+    test('blocks large delta on single-day event that crosses midnight into next unavailable day', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T22:00:00`,
+            end: `${DATE_TUE}T02:00:00`,
+            resources: [weekdayResource],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'e1',
+        originalStart: `${DATE_MON}T22:00:00`,
+        originalEnd: `${DATE_TUE}T02:00:00`,
+        edge: 'bottom',
+        totalDeltaMinutes: 480,
+        targetDayDate: DATE_TUE,
+        originalDayDate: DATE_TUE,
+        ...baseResizeOptions,
+      })
+
+      expect(result.blocked).toBe(true)
+    })
+
+    test('shrinking is always allowed regardless of availability', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_TUE}T17:00:00`,
+            resources: [weekdayResource],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'e1',
+        originalStart: `${DATE_MON}T09:00:00`,
+        originalEnd: `${DATE_TUE}T17:00:00`,
+        edge: 'right',
+        totalDeltaMinutes: -480,
+        targetDayDate: DATE_TUE,
+        originalDayDate: DATE_TUE,
+        ...baseResizeOptions,
+      })
+
+      expect(result.blocked).toBe(false)
+    })
+  })
+
+  describe('getEvents', () => {
+    test('returns a shallow copy of all events', () => {
+      const events: Array<TestEvent> = [
+        {
+          id: 'e1',
+          title: 'Event 1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        },
+      ]
+
+      const cal = createCalendar({ events })
+      const out = cal.getEvents()
+
+      expect(out).toHaveLength(1)
+      expect(out).not.toBe(events)
+    })
+
+    test('returns empty array when no events configured', () => {
+      const cal = createCalendar({ events: [] })
+      expect(cal.getEvents()).toHaveLength(0)
+    })
+  })
+
+  describe('commitUpdate - dependsOn cascade (propagateEndDelta)', () => {
+    test('shifts dependent forward when predecessor end extends past dependent start', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'a',
+            title: 'A',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'b',
+            title: 'B',
+            start: `${DATE_MON}T11:00:00`,
+            end: `${DATE_MON}T12:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'a', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      cal.commitUpdate('a', { end: `${DATE_MON}T12:30:00` })
+
+      const b = cal.getEvents().find((e) => e.id === 'b')!
+      expect(b.start).toBe(`${DATE_MON}T12:30:00`)
+      expect(b.end).toBe(`${DATE_MON}T13:30:00`)
+    })
+
+    test('does not shift dependent when predecessor end still ends before dependent start', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'a',
+            title: 'A',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'b',
+            title: 'B',
+            start: `${DATE_MON}T14:00:00`,
+            end: `${DATE_MON}T15:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'a', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      cal.commitUpdate('a', { end: `${DATE_MON}T11:30:00` })
+
+      const b = cal.getEvents().find((e) => e.id === 'b')!
+      expect(b.start).toBe(`${DATE_MON}T14:00:00`)
+    })
+
+    test('propagates through a chain A → B → C', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'a',
+            title: 'A',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'b',
+            title: 'B',
+            start: `${DATE_MON}T11:00:00`,
+            end: `${DATE_MON}T12:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'a', type: 'FS' }],
+          },
+          {
+            id: 'c',
+            title: 'C',
+            start: `${DATE_MON}T12:00:00`,
+            end: `${DATE_MON}T13:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'b', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      cal.commitUpdate('a', { end: `${DATE_MON}T12:00:00` })
+
+      const b = cal.getEvents().find((e) => e.id === 'b')!
+      const c = cal.getEvents().find((e) => e.id === 'c')!
+      expect(b.start).toBe(`${DATE_MON}T12:00:00`)
+      expect(c.start).toBe(`${DATE_MON}T13:00:00`)
+    })
+
+    test('shifts multiple dependents of the same predecessor', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'a',
+            title: 'A',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'b',
+            title: 'B',
+            start: `${DATE_MON}T11:00:00`,
+            end: `${DATE_MON}T12:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'a', type: 'FS' }],
+          },
+          {
+            id: 'c',
+            title: 'C',
+            start: `${DATE_MON}T11:00:00`,
+            end: `${DATE_MON}T12:30:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'a', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      cal.commitUpdate('a', { end: `${DATE_MON}T12:30:00` })
+
+      const b = cal.getEvents().find((e) => e.id === 'b')!
+      const c = cal.getEvents().find((e) => e.id === 'c')!
+      expect(b.start).toBe(`${DATE_MON}T12:30:00`)
+      expect(c.end).toBe(`${DATE_MON}T14:00:00`)
+    })
+
+    test('does not cascade when only start changes (end unchanged)', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'a',
+            title: 'A',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'b',
+            title: 'B',
+            start: `${DATE_MON}T11:00:00`,
+            end: `${DATE_MON}T12:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'a', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      cal.commitUpdate('a', { start: `${DATE_MON}T09:00:00` })
+
+      const b = cal.getEvents().find((e) => e.id === 'b')!
+      expect(b.start).toBe(`${DATE_MON}T11:00:00`)
+    })
+  })
+
+  describe('validateMove', () => {
+    test('returns blocked:false for unknown event id', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const r = cal.validateMove(
+        'nonexistent',
+        `${DATE_MON}T14:00:00`,
+        `${DATE_MON}T15:00:00`,
+      )
+      expect(r.blocked).toBe(false)
+    })
+
+    test('allows move fully inside availability', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const r = cal.validateMove(
+        'e1',
+        `${DATE_MON}T10:00:00`,
+        `${DATE_MON}T11:00:00`,
+      )
+      expect(r.blocked).toBe(false)
+    })
+
+    test('blocks when the moved range overlaps unavailable hours', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const r = cal.validateMove(
+        'e1',
+        `${DATE_MON}T07:00:00`,
+        `${DATE_MON}T08:00:00`,
+      )
+      expect(r.blocked).toBe(true)
+    })
+
+    test('allows move when event has no resources (no availability to violate)', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ],
+      })
+
+      const r = cal.validateMove(
+        'e1',
+        `${DATE_MON}T06:00:00`,
+        `${DATE_MON}T07:00:00`,
+      )
+      expect(r.blocked).toBe(false)
+    })
+
+    test('blocks when extending end pushes a dependent into unavailable time', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'p',
+            title: 'Predecessor',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'd',
+            title: 'Dependent',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'p', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const r = cal.validateMove(
+        'p',
+        `${DATE_MON}T09:00:00`,
+        `${DATE_MON}T17:00:00`,
+      )
+      expect(r.blocked).toBe(true)
+    })
+
+    test('blocks transitive dependent when cascade would violate availability', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'a',
+            title: 'A',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'b',
+            title: 'B',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'a', type: 'FS' }],
+          },
+          {
+            id: 'c',
+            title: 'C',
+            start: `${DATE_MON}T11:00:00`,
+            end: `${DATE_MON}T12:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'b', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const r = cal.validateMove(
+        'a',
+        `${DATE_MON}T09:00:00`,
+        `${DATE_MON}T15:00:00`,
+      )
+      expect(r.blocked).toBe(true)
+    })
+
+    test('does not run downstream availability check when new end is not extended', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'a',
+            title: 'A',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'b',
+            title: 'B',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'a', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const r = cal.validateMove(
+        'a',
+        `${DATE_MON}T09:00:00`,
+        `${DATE_MON}T10:00:00`,
+      )
+      expect(r.blocked).toBe(false)
+    })
+
+    test('treats split multi-day segment rows as non-targets (no _originalStart match)', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'e1',
+            title: 'Event',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_TUE}T10:00:00`,
+            resources: [weekdayResource],
+            _originalStart: `${DATE_MON}T09:00:00`,
+            _originalEnd: `${DATE_TUE}T10:00:00`,
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const r = cal.validateMove(
+        'e1',
+        `${DATE_TUE}T10:00:00`,
+        `${DATE_TUE}T11:00:00`,
+      )
+      expect(r.blocked).toBe(false)
+    })
+  })
+
+  describe('validateResize - dependsOn (finish-to-start)', () => {
+    const baseResizeOptions = {
+      constraints: { snapToMinutes: 15, minDurationMinutes: 15 },
+    }
+
+    test('blocks moving dependent start before predecessor end (edge left → top)', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'p',
+            title: 'Predecessor',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T12:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'd',
+            title: 'Dependent',
+            start: `${DATE_MON}T12:00:00`,
+            end: `${DATE_MON}T14:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'p', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'd',
+        originalStart: `${DATE_MON}T12:00:00`,
+        originalEnd: `${DATE_MON}T14:00:00`,
+        edge: 'top',
+        totalDeltaMinutes: -60,
+        targetDayDate: DATE_MON,
+        originalDayDate: DATE_MON,
+        ...baseResizeOptions,
+      })
+
+      assert(result.blocked)
+      expect(result.error?.reason).toBe('blocked')
+    })
+
+    test('blocks extending predecessor when dependent would enter unavailable time', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'p',
+            title: 'Predecessor',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'd',
+            title: 'Dependent',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'p', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'p',
+        originalStart: `${DATE_MON}T09:00:00`,
+        originalEnd: `${DATE_MON}T10:00:00`,
+        edge: 'bottom',
+        totalDeltaMinutes: 420,
+        targetDayDate: DATE_MON,
+        originalDayDate: DATE_MON,
+        ...baseResizeOptions,
+      })
+
+      expect(result.blocked).toBe(true)
+    })
+
+    test('allows extending predecessor when dependent stays inside availability', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'p',
+            title: 'Predecessor',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'd',
+            title: 'Dependent',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'p', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'p',
+        originalStart: `${DATE_MON}T09:00:00`,
+        originalEnd: `${DATE_MON}T10:00:00`,
+        edge: 'bottom',
+        totalDeltaMinutes: 60,
+        targetDayDate: DATE_MON,
+        originalDayDate: DATE_MON,
+        ...baseResizeOptions,
+      })
+
+      expect(result.blocked).toBe(false)
+    })
+
+    test('blocks when transitive dependent would leave availability', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'a',
+            title: 'A',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'b',
+            title: 'B',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'a', type: 'FS' }],
+          },
+          {
+            id: 'c',
+            title: 'C',
+            start: `${DATE_MON}T11:00:00`,
+            end: `${DATE_MON}T12:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'b', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'a',
+        originalStart: `${DATE_MON}T09:00:00`,
+        originalEnd: `${DATE_MON}T10:00:00`,
+        edge: 'bottom',
+        totalDeltaMinutes: 420,
+        targetDayDate: DATE_MON,
+        originalDayDate: DATE_MON,
+        ...baseResizeOptions,
+      })
+
+      expect(result.blocked).toBe(true)
+    })
+
+    test('skips cascade availability check when dependent is already outside hours', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'p',
+            title: 'Predecessor',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'd',
+            title: 'Dependent',
+            start: `${DATE_MON}T06:00:00`,
+            end: `${DATE_MON}T07:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'p', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'p',
+        originalStart: `${DATE_MON}T09:00:00`,
+        originalEnd: `${DATE_MON}T10:00:00`,
+        edge: 'bottom',
+        totalDeltaMinutes: 120,
+        targetDayDate: DATE_MON,
+        originalDayDate: DATE_MON,
+        ...baseResizeOptions,
+      })
+
+      expect(result.blocked).toBe(false)
+    })
+
+    test('same cascade rule applies with edge bottom (vertical resize)', () => {
+      const cal = createCalendar({
+        timeZone: 'UTC',
+        events: [
+          {
+            id: 'p',
+            title: 'Predecessor',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [weekdayResource],
+          },
+          {
+            id: 'd',
+            title: 'Dependent',
+            start: `${DATE_MON}T10:00:00`,
+            end: `${DATE_MON}T11:00:00`,
+            resources: [weekdayResource],
+            dependsOn: [{ id: 'p', type: 'FS' }],
+          },
+        ],
+        resources: [weekdayResource],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'p',
+        originalStart: `${DATE_MON}T09:00:00`,
+        originalEnd: `${DATE_MON}T10:00:00`,
+        edge: 'bottom',
+        totalDeltaMinutes: 420,
+        targetDayDate: DATE_MON,
+        originalDayDate: DATE_MON,
+        ...baseResizeOptions,
+      })
+
+      expect(result.blocked).toBe(true)
+    })
+  })
+
+  describe('groupDaysBy', () => {
+    test('groups days into weeks', () => {
+      const cal = createCalendar({
+        viewMode: { value: 2, unit: 'week' },
+      })
+
+      const days = cal.getDaysWithEvents()
+      const grouped = cal.groupDaysBy({ days, unit: 'week' })
+
+      expect(grouped.length).toBeGreaterThanOrEqual(2)
+      expect(grouped[0]!).toHaveLength(7)
+    })
+  })
+
+  describe('capacity / consumption', () => {
+    const capResource: TestResource = {
+      id: 'r-cap',
+      label: 'Capacity Room',
+      capacity: [1],
+      availability: [
+        { weekdays: [1, 2, 3, 4, 5], startTime: '09:00', endTime: '17:00' },
+      ],
+    }
+
+    describe('validateEventPlacement', () => {
+      test('blocks placement when consumption + existing usage exceeds capacity', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+          ],
+          resources: [capResource],
+        })
+
+        const result = cal.validateEventPlacement({
+          title: 'E2',
+          start: `${DATE_MON}T09:30:00`,
+          end: `${DATE_MON}T10:30:00`,
+          resources: [capResource],
+          consumption: [1],
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+
+      test('allows placement when consumption + existing usage equals capacity', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+          ],
+          resources: [capResource],
+        })
+
+        const result = cal.validateEventPlacement({
+          title: 'E2',
+          start: `${DATE_MON}T10:00:00`,
+          end: `${DATE_MON}T11:00:00`,
+          resources: [capResource],
+          consumption: [1],
+        })
+
+        expect(result.blocked).toBe(false)
+      })
+
+      test('allows placement at capacity when ranges do not overlap', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+          ],
+          resources: [capResource],
+        })
+
+        const result = cal.validateEventPlacement({
+          title: 'E2',
+          start: `${DATE_MON}T11:00:00`,
+          end: `${DATE_MON}T12:00:00`,
+          resources: [capResource],
+          consumption: [1],
+        })
+
+        expect(result.blocked).toBe(false)
+      })
+
+      test('treats missing consumption as 1', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+          ],
+          resources: [capResource],
+        })
+
+        const result = cal.validateEventPlacement({
+          title: 'E2',
+          start: `${DATE_MON}T09:30:00`,
+          end: `${DATE_MON}T10:30:00`,
+          resources: [capResource],
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+
+      test('blocks when single new event consumption alone exceeds capacity', () => {
+        const cal = createCalendar({
+          events: [],
+          resources: [capResource],
+        })
+
+        const result = cal.validateEventPlacement({
+          title: 'E1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+          resources: [capResource],
+          consumption: [5],
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+
+      test('allows placement when resource has no capacity configured', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+              consumption: [1],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.validateEventPlacement({
+          title: 'E2',
+          start: `${DATE_MON}T09:30:00`,
+          end: `${DATE_MON}T10:30:00`,
+          resources: [weekdayResource],
+          consumption: [1],
+        })
+
+        expect(result.blocked).toBe(false)
+      })
+
+      test('sums multi-segment capacity array', () => {
+        const multiCapResource: TestResource = {
+          id: 'r-multi',
+          label: 'Multi',
+          capacity: [1, 2],
+          availability: [
+            { weekdays: [1, 2, 3, 4, 5], startTime: '09:00', endTime: '17:00' },
+          ],
+        }
+
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [multiCapResource],
+              consumption: [1, 1],
+            },
+          ],
+          resources: [multiCapResource],
+        })
+
+        const ok = cal.validateEventPlacement({
+          title: 'E2',
+          start: `${DATE_MON}T10:00:00`,
+          end: `${DATE_MON}T11:00:00`,
+          resources: [multiCapResource],
+          consumption: [0, 1],
+        })
+
+        const blocked = cal.validateEventPlacement({
+          title: 'E3',
+          start: `${DATE_MON}T09:30:00`,
+          end: `${DATE_MON}T10:30:00`,
+          resources: [multiCapResource],
+          consumption: [1, 2],
+        })
+
+        expect(ok.blocked).toBe(false)
+        expect(blocked.blocked).toBe(true)
+      })
+
+      test('checks capacity per day for multi-day events', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_TUE}T10:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+          ],
+          resources: [capResource],
+        })
+
+        const result = cal.validateEventPlacement({
+          title: 'E2',
+          start: `${DATE_TUE}T09:00:00`,
+          end: `${DATE_TUE}T10:00:00`,
+          resources: [capResource],
+          consumption: [1],
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+
+      test('does not double-count split multi-day segments', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_TUE}T10:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+          ],
+          resources: [capResource],
+        })
+
+        const result = cal.validateEventPlacement({
+          title: 'E2',
+          start: `${DATE_MON}T10:00:00`,
+          end: `${DATE_TUE}T11:00:00`,
+          resources: [capResource],
+          consumption: [1],
+        })
+
+        expect(result.blocked).toBe(true)
+      })
+    })
+
+    describe('validateMove with capacity', () => {
+      test('blocks move when destination overlap exceeds capacity', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+            {
+              id: 'e2',
+              title: 'E2',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+          ],
+          resources: [capResource],
+        })
+
+        const r = cal.validateMove(
+          'e2',
+          `${DATE_MON}T09:00:00`,
+          `${DATE_MON}T10:00:00`,
+        )
+
+        expect(r.blocked).toBe(true)
+      })
+
+      test('allows move when self consumption would still fit', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+            {
+              id: 'e2',
+              title: 'E2',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+          ],
+          resources: [capResource],
+        })
+
+        const r = cal.validateMove(
+          'e2',
+          `${DATE_MON}T14:00:00`,
+          `${DATE_MON}T15:00:00`,
+        )
+
+        expect(r.blocked).toBe(false)
+      })
+
+      test('uses passed-in newConsumption over event.consumption', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+            {
+              id: 'e2',
+              title: 'E2',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+          ],
+          resources: [capResource],
+        })
+
+        const r = cal.validateMove(
+          'e2',
+          `${DATE_MON}T09:00:00`,
+          `${DATE_MON}T10:00:00`,
+          undefined,
+          [0],
+        )
+
+        expect(r.blocked).toBe(false)
+      })
+    })
+
+    describe('validateEventPlacement - additional', () => {
+      test('skips own id when validating an existing event', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [capResource],
+              consumption: [1],
+            },
+          ],
+          resources: [capResource],
+        })
+
+        const r = cal.validateEventPlacement({
+          id: 'e1',
+          title: 'E1 Updated',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+          resources: [capResource],
+          consumption: [1],
+        })
+
+        expect(r.blocked).toBe(false)
+      })
+    })
+  })
+
+  describe('dependency types (FS, SS, FF, SF)', () => {
+    beforeEach(() => {
+      emitSpy.mockClear()
+    })
+
+    describe('validateEventDependencies', () => {
+      const PRED_START = `${DATE_MON}T10:00:00`
+      const PRED_END = `${DATE_MON}T12:00:00`
+
+      function withPredecessor() {
+        return createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: PRED_START,
+              end: PRED_END,
+            },
+          ],
+        })
+      }
+
+      describe('FS - successor.start must be ≥ predecessor.end', () => {
+        test('valid when successor starts exactly at predecessor end', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T12:00:00`,
+              end: `${DATE_MON}T13:00:00`,
+            },
+            [{ id: 'p', type: 'FS' }],
+          )
+          expect(result.valid).toBe(true)
+        })
+
+        test('valid when successor starts after predecessor end', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T13:00:00`,
+              end: `${DATE_MON}T14:00:00`,
+            },
+            [{ id: 'p', type: 'FS' }],
+          )
+          expect(result.valid).toBe(true)
+        })
+
+        test('invalid when successor starts before predecessor end', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T13:00:00`,
+            },
+            [{ id: 'p', type: 'FS' }],
+          )
+          assert(!result.valid)
+          expect(result.error?.reason).toBe('blocked')
+          expect(result.error?.message).toContain('cannot start before')
+          expect(result.error?.message).toContain('ends')
+          expect(result.error?.message).toContain('(FS)')
+        })
+      })
+
+      describe('SS - successor.start must be ≥ predecessor.start', () => {
+        test('valid when successor starts exactly at predecessor start', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+            },
+            [{ id: 'p', type: 'SS' }],
+          )
+          expect(result.valid).toBe(true)
+        })
+
+        test('valid when successor starts after predecessor start (even if predecessor still running)', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T10:30:00`,
+              end: `${DATE_MON}T11:30:00`,
+            },
+            [{ id: 'p', type: 'SS' }],
+          )
+          expect(result.valid).toBe(true)
+        })
+
+        test('invalid when successor starts before predecessor start', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T09:30:00`,
+              end: `${DATE_MON}T11:00:00`,
+            },
+            [{ id: 'p', type: 'SS' }],
+          )
+          assert(!result.valid)
+          expect(result.error?.message).toContain('cannot start before')
+          expect(result.error?.message).toContain('starts')
+          expect(result.error?.message).toContain('(SS)')
+        })
+      })
+
+      describe('FF - successor.end must be ≥ predecessor.end', () => {
+        test('valid when successor ends exactly at predecessor end', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+            },
+            [{ id: 'p', type: 'FF' }],
+          )
+          expect(result.valid).toBe(true)
+        })
+
+        test('valid when successor ends after predecessor end', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T08:00:00`,
+              end: `${DATE_MON}T13:00:00`,
+            },
+            [{ id: 'p', type: 'FF' }],
+          )
+          expect(result.valid).toBe(true)
+        })
+
+        test('invalid when successor ends before predecessor end', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T11:30:00`,
+            },
+            [{ id: 'p', type: 'FF' }],
+          )
+          assert(!result.valid)
+          expect(result.error?.message).toContain('cannot end before')
+          expect(result.error?.message).toContain('ends')
+          expect(result.error?.message).toContain('(FF)')
+        })
+      })
+
+      describe('SF - successor.end must be ≥ predecessor.start', () => {
+        test('valid when successor ends exactly at predecessor start', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            },
+            [{ id: 'p', type: 'SF' }],
+          )
+          expect(result.valid).toBe(true)
+        })
+
+        test('valid when successor ends after predecessor start', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T08:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+            },
+            [{ id: 'p', type: 'SF' }],
+          )
+          expect(result.valid).toBe(true)
+        })
+
+        test('invalid when successor ends before predecessor start', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T08:00:00`,
+              end: `${DATE_MON}T09:30:00`,
+            },
+            [{ id: 'p', type: 'SF' }],
+          )
+          assert(!result.valid)
+          expect(result.error?.message).toContain('cannot end before')
+          expect(result.error?.message).toContain('starts')
+          expect(result.error?.message).toContain('(SF)')
+        })
+      })
+
+      describe('shape and edge cases', () => {
+        test('returns valid:true when there are no events in the calendar', () => {
+          const cal = createCalendar()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+            },
+            [{ id: 'missing', type: 'FS' }],
+          )
+          expect(result.valid).toBe(true)
+        })
+
+        test('skips dependencies whose predecessor id is unknown', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T08:00:00`,
+              end: `${DATE_MON}T09:00:00`,
+            },
+            [{ id: 'does-not-exist', type: 'FS' }],
+          )
+          expect(result.valid).toBe(true)
+        })
+
+        test('reports the first failing dependency when multiple are violated', () => {
+          const cal = createCalendar({
+            events: [
+              {
+                id: 'p1',
+                title: 'P1',
+                start: `${DATE_MON}T10:00:00`,
+                end: `${DATE_MON}T11:00:00`,
+              },
+              {
+                id: 'p2',
+                title: 'P2',
+                start: `${DATE_MON}T13:00:00`,
+                end: `${DATE_MON}T14:00:00`,
+              },
+            ],
+          })
+
+          const result = cal.validateEventDependencies(
+            {
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T09:30:00`,
+            },
+            [
+              { id: 'p1', type: 'FS' },
+              { id: 'p2', type: 'FS' },
+            ],
+          )
+
+          assert(!result.valid)
+          expect(result.error?.message).toContain('P1')
+        })
+
+        test('passes through provided event id and title in the error payload', () => {
+          const cal = withPredecessor()
+          const result = cal.validateEventDependencies(
+            {
+              id: 'my-event',
+              title: 'My Event',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T11:30:00`,
+            },
+            [{ id: 'p', type: 'FS' }],
+          )
+
+          assert(!result.valid)
+          expect(result.error?.eventId).toBe('my-event')
+          expect(result.error?.eventTitle).toBe('My Event')
+          expect(result.error?.originalStart).toBe(`${DATE_MON}T11:00:00`)
+          expect(result.error?.originalEnd).toBe(`${DATE_MON}T11:30:00`)
+        })
+      })
+    })
+
+    describe('validateMove - predecessor cascade per type', () => {
+      test('FS: moving successor earlier pulls predecessor back into unavailable hours → blocked', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T08:30:00`,
+              end: `${DATE_MON}T09:30:00`,
+              resources: [weekdayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [weekdayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const r = cal.validateMove(
+          's',
+          `${DATE_MON}T08:00:00`,
+          `${DATE_MON}T09:00:00`,
+        )
+        expect(r.blocked).toBe(true)
+        expect(r.blockedEventTitle).toBe('P')
+        expect(r.message).toContain('pulled into unavailable')
+      })
+
+      test('SS: moving successor before predecessor.start pulls predecessor back', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T08:30:00`,
+              end: `${DATE_MON}T09:30:00`,
+              resources: [weekdayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+              dependsOn: [{ id: 'p', type: 'SS' }],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const r = cal.validateMove(
+          's',
+          `${DATE_MON}T07:30:00`,
+          `${DATE_MON}T08:30:00`,
+        )
+        expect(r.blocked).toBe(true)
+        expect(r.blockedEventTitle).toBe('P')
+      })
+
+      test('FF: shrinking successor.end below predecessor.end pulls predecessor back', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T08:30:00`,
+              end: `${DATE_MON}T09:30:00`,
+              resources: [weekdayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+              dependsOn: [{ id: 'p', type: 'FF' }],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const allowed = cal.validateMove(
+          's',
+          `${DATE_MON}T08:00:00`,
+          `${DATE_MON}T09:00:00`,
+        )
+        expect(allowed.blocked).toBe(false)
+
+        const blocked = cal.validateMove(
+          's',
+          `${DATE_MON}T07:30:00`,
+          `${DATE_MON}T08:30:00`,
+        )
+        expect(blocked.blocked).toBe(true)
+        expect(blocked.blockedEventTitle).toBe('P')
+      })
+
+      test('SF: shrinking successor.end below predecessor.start pulls predecessor back', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T08:30:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+              dependsOn: [{ id: 'p', type: 'SF' }],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const r = cal.validateMove(
+          's',
+          `${DATE_MON}T06:30:00`,
+          `${DATE_MON}T07:30:00`,
+        )
+        expect(r.blocked).toBe(true)
+        expect(r.blockedEventTitle).toBe('P')
+      })
+
+      test('FS: moving successor later (constraint already satisfied) does not touch predecessor', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        const r = cal.validateMove(
+          's',
+          `${DATE_MON}T14:00:00`,
+          `${DATE_MON}T15:00:00`,
+        )
+        expect(r.blocked).toBe(false)
+      })
+    })
+
+    describe('createDependency', () => {
+      test('FS: reschedules target forward when target.start < source.end', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T13:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+          resources: [allDayResource],
+        })
+        cal.commitUpdate('s', { dependsOn: [] })
+
+        const result = cal.createDependency('p', 's', 'FS')
+
+        expect(result.blocked).toBe(false)
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.start).toBe(`${DATE_MON}T12:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T14:00:00`)
+        expect(s.dependsOn).toEqual([{ id: 'p', type: 'FS' }])
+      })
+
+      test('SS: reschedules target forward when target.start < source.start', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:30:00`,
+              resources: [allDayResource],
+            },
+          ],
+          resources: [allDayResource],
+        })
+        cal.commitUpdate('s', { dependsOn: [] })
+
+        const result = cal.createDependency('p', 's', 'SS')
+
+        expect(result.blocked).toBe(false)
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.start).toBe(`${DATE_MON}T10:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T11:30:00`)
+      })
+
+      test('FF: reschedules target forward when target.end < source.end', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T13:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+          resources: [allDayResource],
+        })
+        cal.commitUpdate('s', { dependsOn: [] })
+
+        const result = cal.createDependency('p', 's', 'FF')
+
+        expect(result.blocked).toBe(false)
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.start).toBe(`${DATE_MON}T11:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T13:00:00`)
+      })
+
+      test('SF: reschedules target forward when target.end < source.start', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T13:00:00`,
+              end: `${DATE_MON}T15:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+          resources: [allDayResource],
+        })
+        cal.commitUpdate('s', { dependsOn: [] })
+
+        const result = cal.createDependency('p', 's', 'SF')
+
+        expect(result.blocked).toBe(false)
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.start).toBe(`${DATE_MON}T12:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T13:00:00`)
+      })
+
+      test('does not reschedule when constraint is already satisfied', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        const result = cal.createDependency('p', 's', 'FS')
+
+        expect(result.blocked).toBe(false)
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.start).toBe(`${DATE_MON}T11:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T12:00:00`)
+        expect(s.dependsOn).toEqual([{ id: 'p', type: 'FS' }])
+      })
+
+      test('default type is FS when no type is specified', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.createDependency('p', 's')
+
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.dependsOn).toEqual([{ id: 'p', type: 'FS' }])
+      })
+
+      test('does nothing when source or target is missing', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            },
+          ],
+        })
+
+        expect(cal.createDependency('p', 'missing', 'FS')).toEqual({
+          blocked: false,
+        })
+        expect(cal.createDependency('missing', 'p', 'FS')).toEqual({
+          blocked: false,
+        })
+      })
+
+      test('is idempotent - adding the same (sourceId, type) pair twice is a no-op', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.createDependency('p', 's', 'FS')
+        cal.createDependency('p', 's', 'FS')
+
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.dependsOn).toEqual([{ id: 'p', type: 'FS' }])
+      })
+
+      test('allows the same source to be linked to the same target with different types', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.createDependency('p', 's', 'FS')
+        cal.createDependency('p', 's', 'SS')
+
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.dependsOn).toEqual([
+          { id: 'p', type: 'FS' },
+          { id: 'p', type: 'SS' },
+        ])
+      })
+
+      test('blocks creation when reschedule would land target in unavailable time', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T15:00:00`,
+              end: `${DATE_MON}T16:00:00`,
+              resources: [weekdayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T16:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.createDependency('p', 's', 'FS')
+
+        assert(result.blocked)
+        expect(result.error?.reason).toBe('unavailable-time')
+        expect(result.error?.eventId).toBe('s')
+        expect(result.error?.attemptedStart).toBe(`${DATE_MON}T16:00:00`)
+        expect(result.error?.attemptedEnd).toBe(`${DATE_MON}T23:00:00`)
+
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.start).toBe(`${DATE_MON}T09:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T16:00:00`)
+        expect(s.dependsOn ?? []).toEqual([])
+      })
+
+      test('blocks circular dependency: A->B, B->C, try C->A', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'a',
+              title: 'A',
+              start: `${DATE_MON}T08:00:00`,
+              end: `${DATE_MON}T09:00:00`,
+              resources: ['r1'],
+            },
+            {
+              id: 'b',
+              title: 'B',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: ['r1'],
+              dependsOn: [{ id: 'a', type: 'FS' as const }],
+            },
+            {
+              id: 'c',
+              title: 'C',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: ['r1'],
+              dependsOn: [{ id: 'b', type: 'FS' as const }],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.createDependency('c', 'a', 'FS')
+        assert(result.blocked)
+        expect(result.error?.reason).toBe('blocked')
+        expect(result.error?.message).toContain('circular dependency')
+      })
+
+      test('blocks self-dependency', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'a',
+              title: 'A',
+              start: `${DATE_MON}T08:00:00`,
+              end: `${DATE_MON}T09:00:00`,
+              resources: ['r1'],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.createDependency('a', 'a', 'FS')
+        assert(result.blocked)
+        expect(result.error?.reason).toBe('blocked')
+        expect(result.error?.message).toContain('circular dependency')
+      })
+
+      test('allows non-circular chain: A->B, B->C, C->D', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'a',
+              title: 'A',
+              start: `${DATE_MON}T08:00:00`,
+              end: `${DATE_MON}T09:00:00`,
+              resources: ['r1'],
+            },
+            {
+              id: 'b',
+              title: 'B',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: ['r1'],
+              dependsOn: [{ id: 'a', type: 'FS' as const }],
+            },
+            {
+              id: 'c',
+              title: 'C',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: ['r1'],
+              dependsOn: [{ id: 'b', type: 'FS' as const }],
+            },
+            {
+              id: 'd',
+              title: 'D',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: ['r1'],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.createDependency('c', 'd', 'FS')
+        assert(!result.blocked)
+      })
+    })
+
+    describe('commitUpdate forward cascade per type', () => {
+      test('FS: shifts successor when predecessor.end extends past successor.start', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('p', { end: `${DATE_MON}T12:30:00` })
+
+        const s = cal.getEvents().find((e) => e.id === 's')!
+
+        expect(s.start).toBe(`${DATE_MON}T12:30:00`)
+        expect(s.end).toBe(`${DATE_MON}T13:30:00`)
+      })
+
+      test('SS: shifts successor when predecessor.start moves later past successor.start', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T10:30:00`,
+              end: `${DATE_MON}T11:30:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'SS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('p', {
+          start: `${DATE_MON}T11:00:00`,
+          end: `${DATE_MON}T12:00:00`,
+        })
+
+        const s = cal.getEvents().find((e) => e.id === 's')!
+
+        expect(s.start).toBe(`${DATE_MON}T11:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T12:00:00`)
+      })
+
+      test('FF: shifts successor when predecessor.end moves past successor.end', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T10:30:00`,
+              end: `${DATE_MON}T11:30:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FF' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('p', { end: `${DATE_MON}T13:00:00` })
+
+        const s = cal.getEvents().find((e) => e.id === 's')!
+
+        expect(s.start).toBe(`${DATE_MON}T12:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T13:00:00`)
+      })
+
+      test('SF: shifts successor when predecessor.start moves past successor.end', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'SF' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('p', {
+          start: `${DATE_MON}T13:00:00`,
+          end: `${DATE_MON}T14:00:00`,
+        })
+
+        const s = cal.getEvents().find((e) => e.id === 's')!
+
+        expect(s.start).toBe(`${DATE_MON}T12:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T13:00:00`)
+      })
+
+      test('does not shift when constraint stays satisfied', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T14:00:00`,
+              end: `${DATE_MON}T15:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('p', { end: `${DATE_MON}T11:30:00` })
+
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.start).toBe(`${DATE_MON}T14:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T15:00:00`)
+      })
+
+      test('mixed-type chain propagates correctly: A -SS→ B -FS→ C', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'a',
+              title: 'A',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 'b',
+              title: 'B',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:30:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'a', type: 'SS' }],
+            },
+            {
+              id: 'c',
+              title: 'C',
+              start: `${DATE_MON}T10:30:00`,
+              end: `${DATE_MON}T11:30:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'b', type: 'FS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('a', {
+          start: `${DATE_MON}T10:00:00`,
+          end: `${DATE_MON}T11:00:00`,
+        })
+
+        const events = cal.getEvents()
+        const b = events.find((e) => e.id === 'b')!
+        const c = events.find((e) => e.id === 'c')!
+        expect(b.start).toBe(`${DATE_MON}T10:00:00`)
+        expect(b.end).toBe(`${DATE_MON}T11:30:00`)
+        expect(c.start).toBe(`${DATE_MON}T11:30:00`)
+        expect(c.end).toBe(`${DATE_MON}T12:30:00`)
+      })
+
+      test('shifts only the dependents of the changed predecessor - unrelated events stay put', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+            {
+              id: 'unrelated',
+              title: 'Unrelated',
+              start: `${DATE_MON}T11:30:00`,
+              end: `${DATE_MON}T12:30:00`,
+              resources: [allDayResource],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('p', { end: `${DATE_MON}T13:00:00` })
+
+        const u = cal.getEvents().find((e) => e.id === 'unrelated')!
+        expect(u.start).toBe(`${DATE_MON}T11:30:00`)
+        expect(u.end).toBe(`${DATE_MON}T12:30:00`)
+      })
+    })
+
+    describe('commitUpdate backward cascade per type', () => {
+      test('FS: pulls predecessor back when successor.start moves before predecessor.end', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T12:00:00`,
+              end: `${DATE_MON}T13:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('s', {
+          start: `${DATE_MON}T10:00:00`,
+          end: `${DATE_MON}T11:00:00`,
+        })
+
+        const p = cal.getEvents().find((e) => e.id === 'p')!
+
+        expect(p.start).toBe(`${DATE_MON}T09:00:00`)
+        expect(p.end).toBe(`${DATE_MON}T10:00:00`)
+      })
+
+      test('SS: pulls predecessor back when successor.start moves before predecessor.start', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:30:00`,
+              end: `${DATE_MON}T12:30:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'SS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('s', {
+          start: `${DATE_MON}T10:00:00`,
+          end: `${DATE_MON}T11:00:00`,
+        })
+
+        const p = cal.getEvents().find((e) => e.id === 'p')!
+
+        expect(p.start).toBe(`${DATE_MON}T10:00:00`)
+        expect(p.end).toBe(`${DATE_MON}T11:00:00`)
+      })
+    })
+
+    describe('validateResize top-edge dependency check', () => {
+      const baseResizeOptions = {
+        constraints: { snapToMinutes: 15, minDurationMinutes: 15 },
+      }
+
+      test('FS: blocked when shrinking start before predecessor.end', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T12:00:00`,
+              end: `${DATE_MON}T14:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        const r = cal.validateResize({
+          eventId: 's',
+          originalStart: `${DATE_MON}T12:00:00`,
+          originalEnd: `${DATE_MON}T14:00:00`,
+          edge: 'top',
+          totalDeltaMinutes: -60,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(r.blocked).toBe(true)
+        expect(r.error?.reason).toBe('blocked')
+        expect(r.error?.message).toContain('FS')
+      })
+
+      test('SS: blocked when shrinking start before predecessor.start', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T14:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'SS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        const r = cal.validateResize({
+          eventId: 's',
+          originalStart: `${DATE_MON}T11:00:00`,
+          originalEnd: `${DATE_MON}T14:00:00`,
+          edge: 'top',
+          totalDeltaMinutes: -120,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(r.blocked).toBe(true)
+        expect(r.error?.message).toContain('SS')
+      })
+
+      test('FF: not blocked by top-edge resize because end stays unchanged', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T13:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FF' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        const r = cal.validateResize({
+          eventId: 's',
+          originalStart: `${DATE_MON}T11:00:00`,
+          originalEnd: `${DATE_MON}T13:00:00`,
+          edge: 'top',
+          totalDeltaMinutes: -90,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(r.blocked).toBe(false)
+      })
+    })
+
+    describe('addEvent', () => {
+      test('successfully adds an event and returns { success: true }', async () => {
+        const cal = createCalendar({ resources: [weekdayResource] })
+
+        const result = await cal.addEvent({
+          id: 'e1',
+          title: 'New Event',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+          resources: [weekdayResource],
+        })
+
+        expect(result.success).toBe(true)
+        expect(cal.getEvents()).toHaveLength(1)
+        expect(cal.getEvents()[0]!.id).toBe('e1')
+      })
+
+      test('returns failure when placement violates resource availability', async () => {
+        const cal = createCalendar({ resources: [weekdayResource] })
+
+        const result = await cal.addEvent({
+          id: 'e1',
+          title: 'Too Early',
+          start: `${DATE_MON}T06:00:00`,
+          end: `${DATE_MON}T07:00:00`,
+          resources: [weekdayResource],
+        })
+
+        assert(!result.success)
+        expect(result.error.reason).toBe('blocked')
+        expect(result.error.eventId).toBe('e1')
+        expect(result.error.eventTitle).toBe('Too Early')
+        expect(result.error.originalStart).toBe(`${DATE_MON}T06:00:00`)
+        expect(result.error.originalEnd).toBe(`${DATE_MON}T07:00:00`)
+
+        expect(cal.getEvents()).toHaveLength(0)
+      })
+
+      test('returns failure when dependency constraint is violated', async () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+            },
+          ],
+        })
+
+        const result = await cal.addEvent(
+          {
+            id: 's',
+            title: 'S',
+            start: `${DATE_MON}T11:00:00`,
+            end: `${DATE_MON}T13:00:00`,
+          },
+          { dependsOn: [{ id: 'p', type: 'FS' }] },
+        )
+
+        assert(!result.success)
+        expect(result.error.reason).toBe('blocked')
+        expect(result.error.message).toContain('cannot start before')
+        expect(cal.getEvents().find((e) => e.id === 's')).toBeUndefined()
+      })
+
+      test('triggers fetchEvents for the event date range before validating', async () => {
+        const fetchEvents = vi.fn().mockResolvedValue([])
+        const cal = createCalendar({
+          resources: [weekdayResource],
+          fetchEvents,
+        })
+
+        await cal.addEvent({
+          id: 'e1',
+          title: 'Event',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+          resources: [weekdayResource],
+        })
+
+        expect(fetchEvents).toHaveBeenCalledTimes(1)
+        const call = fetchEvents.mock.calls[0]![0]
+        expect(call.start).toBe(DATE_MON)
+        expect(call.end).toBe(DATE_TUE)
+      })
+
+      test('does not fetch when fetchEvents is not configured', async () => {
+        const cal = createCalendar({ resources: [weekdayResource] })
+
+        const result = await cal.addEvent({
+          id: 'e1',
+          title: 'Event',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+          resources: [weekdayResource],
+        })
+
+        expect(result.success).toBe(true)
+      })
+    })
+
+    describe('editEvent', () => {
+      test('successfully updates an event', async () => {
+        const cal = createCalendar({
+          resources: [weekdayResource],
+          events: [
+            {
+              id: 'e1',
+              title: 'Original',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+        })
+
+        const result = await cal.editEvent('e1', { title: 'Updated' })
+
+        expect(result.success).toBe(true)
+        expect(cal.getEvents()[0]!.title).toBe('Updated')
+      })
+
+      test('returns failure for unknown event id', async () => {
+        const cal = createCalendar()
+
+        const result = await cal.editEvent('nonexistent', { title: 'X' })
+
+        assert(!result.success)
+        expect(result.error.eventId).toBe('nonexistent')
+        expect(result.error.message).toContain('not found')
+      })
+
+      test('skips move validation when start/end/resources/consumption are unchanged', async () => {
+        const cal = createCalendar({
+          resources: [weekdayResource],
+          events: [
+            {
+              id: 'e1',
+              title: 'Original',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+        })
+
+        const result = await cal.editEvent('e1', { title: 'Renamed' })
+        expect(result.success).toBe(true)
+        expect(cal.getEvents()[0]!.title).toBe('Renamed')
+      })
+
+      test('returns failure when new position violates availability', async () => {
+        const cal = createCalendar({
+          resources: [weekdayResource],
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+        })
+
+        const result = await cal.editEvent('e1', {
+          start: `${DATE_MON}T06:00:00`,
+          end: `${DATE_MON}T07:00:00`,
+        })
+
+        assert(!result.success)
+        expect(result.error.attemptedStart).toBe(`${DATE_MON}T06:00:00`)
+        expect(result.error.attemptedEnd).toBe(`${DATE_MON}T07:00:00`)
+        expect(result.error.originalStart).toBe(`${DATE_MON}T09:00:00`)
+        expect(result.error.originalEnd).toBe(`${DATE_MON}T10:00:00`)
+        expect(cal.getEvents()[0]!.start).toBe(`${DATE_MON}T09:00:00`)
+      })
+
+      test('fetchEvents range covers both old and new positions', async () => {
+        const fetchEvents = vi.fn().mockResolvedValue([])
+        const cal = createCalendar({
+          resources: [allDayResource],
+          fetchEvents,
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_TUE}T09:00:00`,
+              end: `${DATE_TUE}T10:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+        })
+
+        fetchEvents.mockClear()
+
+        await cal.editEvent('e1', {
+          start: `${DATE_WED}T09:00:00`,
+          end: `${DATE_WED}T10:00:00`,
+        })
+
+        expect(fetchEvents).toHaveBeenCalled()
+        const call = fetchEvents.mock.calls[0]![0]
+        expect(call.start <= DATE_TUE).toBe(true)
+        expect(call.end > DATE_WED).toBe(true)
+      })
+
+      test('validates dependency constraint when dependsOn is provided', async () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T13:00:00`,
+              end: `${DATE_MON}T14:00:00`,
+            },
+          ],
+        })
+
+        const result = await cal.editEvent(
+          's',
+          { start: `${DATE_MON}T11:00:00`, end: `${DATE_MON}T12:00:00` },
+          { dependsOn: [{ id: 'p', type: 'FS' }] },
+        )
+
+        assert(!result.success)
+        expect(result.error.reason).toBe('blocked')
+      })
+    })
+
+    describe('fetchEventsForRange', () => {
+      test('resolves immediately and is a no-op when fetchEvents is not configured', async () => {
+        const cal = createCalendar()
+        await expect(
+          cal.fetchEventsForRange(DATE_MON, DATE_TUE),
+        ).resolves.toBeUndefined()
+        expect(cal.getLoadedRanges()).toHaveLength(0)
+      })
+
+      test('calls fetchEvents and merges fetched events into the calendar', async () => {
+        const fetched: Array<TestEvent> = [
+          {
+            id: 'e1',
+            title: 'Fetched',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ]
+        const fetchEvents = vi.fn().mockResolvedValue(fetched)
+        const cal = createCalendar({ fetchEvents })
+
+        await cal.fetchEventsForRange(DATE_MON, DATE_TUE)
+
+        expect(fetchEvents).toHaveBeenCalledWith({
+          start: DATE_MON,
+          end: DATE_TUE,
+        })
+        expect(cal.getEvents()).toHaveLength(1)
+        expect(cal.getEvents()[0]!.id).toBe('e1')
+      })
+
+      test('does not refetch a range that is already loaded', async () => {
+        const fetchEvents = vi.fn().mockResolvedValue([])
+        const cal = createCalendar({ fetchEvents })
+
+        await cal.fetchEventsForRange(DATE_MON, DATE_TUE)
+        await cal.fetchEventsForRange(DATE_MON, DATE_TUE)
+
+        expect(fetchEvents).toHaveBeenCalledTimes(1)
+      })
+
+      test('does not refetch a sub-range of an already loaded range', async () => {
+        const fetchEvents = vi.fn().mockResolvedValue([])
+        const cal = createCalendar({ fetchEvents })
+
+        await cal.fetchEventsForRange(DATE_MON, '2024-03-25')
+        await cal.fetchEventsForRange(DATE_TUE, DATE_WED)
+
+        expect(fetchEvents).toHaveBeenCalledTimes(1)
+      })
+
+      test('deduplicates fetched events by id', async () => {
+        const fetchEvents = vi.fn().mockResolvedValue([
+          {
+            id: 'e1',
+            title: 'Existing',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ])
+        const cal = createCalendar({
+          fetchEvents,
+          events: [
+            {
+              id: 'e1',
+              title: 'Existing',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            },
+          ],
+        })
+
+        await cal.fetchEventsForRange(DATE_MON, DATE_TUE)
+
+        expect(cal.getEvents().filter((e) => e.id === 'e1')).toHaveLength(1)
+      })
+
+      test('un-marks the range on fetch error so future calls can retry', async () => {
+        const fetchEvents = vi
+          .fn()
+          .mockRejectedValueOnce(new Error('network'))
+          .mockResolvedValueOnce([])
+        const cal = createCalendar({ fetchEvents })
+
+        await cal.fetchEventsForRange(DATE_MON, DATE_TUE)
+        expect(cal.getLoadedRanges()).toHaveLength(0)
+
+        await cal.fetchEventsForRange(DATE_MON, DATE_TUE)
+        expect(fetchEvents).toHaveBeenCalledTimes(2)
+        expect(cal.getLoadedRanges()).toHaveLength(1)
+      })
+
+      test('getLoadedRanges merges overlapping ranges', async () => {
+        const fetchEvents = vi.fn().mockResolvedValue([])
+        const cal = createCalendar({ fetchEvents })
+
+        await cal.fetchEventsForRange('2024-03-01', '2024-03-10')
+        await cal.fetchEventsForRange('2024-03-05', '2024-03-15')
+
+        const ranges = cal.getLoadedRanges()
+        expect(ranges).toHaveLength(1)
+        expect(ranges[0]!.start).toBe('2024-03-01')
+        expect(ranges[0]!.end).toBe('2024-03-15')
+      })
+
+      test('getLoadedRanges keeps disjoint ranges separate', async () => {
+        const fetchEvents = vi.fn().mockResolvedValue([])
+        const cal = createCalendar({ fetchEvents })
+
+        await cal.fetchEventsForRange('2024-03-01', '2024-03-05')
+        await cal.fetchEventsForRange('2024-03-10', '2024-03-15')
+
+        expect(cal.getLoadedRanges()).toHaveLength(2)
+      })
+
+      test('emits events:set when new events are merged in', async () => {
+        const fetchEvents = vi.fn().mockResolvedValue([
+          {
+            id: 'e1',
+            title: 'Fetched',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+          },
+        ])
+        const cal = createCalendar({ fetchEvents })
+
+        await cal.fetchEventsForRange(DATE_MON, DATE_TUE)
+
+        const setCall = emitSpy.mock.calls.find(
+          ([name]) => name === 'events:set',
+        )
+        expect(setCall).toBeDefined()
+        expect(setCall![1].events).toHaveLength(1)
+        expect(setCall![1].events[0].eventId).toBe('e1')
+      })
+
+      test('does not emit events:set when fetch returns nothing new', async () => {
+        const fetchEvents = vi.fn().mockResolvedValue([])
+        const cal = createCalendar({ fetchEvents })
+
+        await cal.fetchEventsForRange(DATE_MON, DATE_TUE)
+
+        const setCall = emitSpy.mock.calls.find(
+          ([name]) => name === 'events:set',
+        )
+        expect(setCall).toBeUndefined()
+      })
+    })
+
+    describe('event emissions', () => {
+      test('commitAdd emits event:added', () => {
+        const cal = createCalendar()
+        cal.commitAdd({
+          id: 'e1',
+          title: 'New',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        })
+
+        const addCall = emitSpy.mock.calls.find(
+          ([name]) => name === 'event:added',
+        )
+        expect(addCall).toBeDefined()
+        expect(addCall![1]).toMatchObject({
+          eventId: 'e1',
+          eventTitle: 'New',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        })
+      })
+
+      test('commitUpdate emits event:updated with the patch', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Original',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            },
+          ],
+        })
+        emitSpy.mockClear()
+
+        cal.commitUpdate('e1', { title: 'Renamed' })
+
+        const upd = emitSpy.mock.calls.find(
+          ([name]) => name === 'event:updated',
+        )
+        expect(upd).toBeDefined()
+        expect(upd![1].eventId).toBe('e1')
+        expect(upd![1].updates).toMatchObject({ title: 'Renamed' })
+      })
+
+      test('removeEvent emits event:removed', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'To Remove',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            },
+          ],
+        })
+        emitSpy.mockClear()
+
+        cal.removeEvent('e1')
+
+        const rem = emitSpy.mock.calls.find(
+          ([name]) => name === 'event:removed',
+        )
+        expect(rem).toBeDefined()
+        expect(rem![1].eventId).toBe('e1')
+        expect(rem![1].eventTitle).toBe('To Remove')
+      })
+
+      test('removeEvent does not emit when id does not exist', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Keep',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            },
+          ],
+        })
+        emitSpy.mockClear()
+
+        cal.removeEvent('nope')
+
+        const rem = emitSpy.mock.calls.find(
+          ([name]) => name === 'event:removed',
+        )
+        expect(rem).toBeUndefined()
+      })
+
+      test('commitUpdate cascade emits event:updated for shifted dependents', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+        emitSpy.mockClear()
+
+        cal.commitUpdate('p', { end: `${DATE_MON}T12:30:00` })
+
+        const updatedIds = emitSpy.mock.calls
+          .filter(([name]) => name === 'event:updated')
+          .map(([, payload]) => payload.eventId)
+        expect(updatedIds).toContain('p')
+        expect(updatedIds).toContain('s')
+      })
+    })
+
+    describe('getTimelineLayout', () => {
+      test('returns one row per resource', () => {
+        const cal = createCalendar({
+          resources: [weekdayResource, afternoonResource, allDayResource],
+        })
+
+        const layout = cal.getTimelineLayout()
+        expect(layout.rows).toHaveLength(3)
+        expect(layout.rows.map((r) => r.resource.id)).toEqual([
+          'r1',
+          'r2',
+          'r3',
+        ])
+      })
+
+      test('row has empty events when resource has none', () => {
+        const cal = createCalendar({ resources: [weekdayResource] })
+
+        const layout = cal.getTimelineLayout()
+        expect(layout.rows[0]!.events).toHaveLength(0)
+        expect(layout.rows[0]!.laneCount).toBe(1)
+      })
+
+      test('places non-overlapping events on the same lane', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          resources: [allDayResource],
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 'e2',
+              title: 'E2',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const layout = cal.getTimelineLayout()
+        const row = layout.rows[0]!
+        expect(row.events).toHaveLength(2)
+        expect(row.laneCount).toBe(1)
+        expect(row.events.every((e) => e.lane === 0)).toBe(true)
+      })
+
+      test('assigns overlapping events to separate lanes', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          resources: [allDayResource],
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 'e2',
+              title: 'E2',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const layout = cal.getTimelineLayout()
+        const row = layout.rows[0]!
+        expect(row.events).toHaveLength(2)
+        expect(row.laneCount).toBe(2)
+        const lanes = row.events.map((e) => e.lane).sort()
+        expect(lanes).toEqual([0, 1])
+      })
+
+      test('currentTimePosition is null when today is not in the visible range', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          resources: [allDayResource],
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const layout = cal.getTimelineLayout()
+        expect(layout.currentTimePosition).toBeNull()
+      })
+
+      test('events fully outside the visible range are filtered out (zero width)', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          resources: [allDayResource],
+          events: [
+            {
+              id: 'far',
+              title: 'Far',
+              start: '2025-01-01T09:00:00',
+              end: '2025-01-01T10:00:00',
+              resources: [allDayResource],
+            },
+          ],
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const layout = cal.getTimelineLayout()
+        expect(layout.rows[0]!.events).toHaveLength(0)
+      })
+    })
+
+    describe('getEventsByResource', () => {
+      test('returns one entry per configured resource', () => {
+        const cal = createCalendar({
+          resources: [weekdayResource, afternoonResource],
+        })
+
+        const byResource = cal.getEventsByResource()
+        expect(byResource.has('r1')).toBe(true)
+        expect(byResource.has('r2')).toBe(true)
+      })
+
+      test('groups events by their assigned resources', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          resources: [allDayResource, afternoonResource],
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 'e2',
+              title: 'E2',
+              start: `${DATE_MON}T13:00:00`,
+              end: `${DATE_MON}T14:00:00`,
+              resources: [afternoonResource],
+            },
+          ],
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const byResource = cal.getEventsByResource()
+        expect(byResource.get('r3')!.map((e) => e.id)).toEqual(['e1'])
+        expect(byResource.get('r2')!.map((e) => e.id)).toEqual(['e2'])
+      })
+
+      test('merges multi-day segments back to a single full-span event', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          resources: [allDayResource],
+          events: [
+            {
+              id: 'multi',
+              title: 'Multi',
+              start: `${DATE_MON}T20:00:00`,
+              end: `${DATE_TUE}T04:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const byResource = cal.getEventsByResource()
+        const events = byResource.get('r3')!
+        expect(events).toHaveLength(1)
+        expect(events[0]!.id).toBe('multi')
+        expect(events[0]!.start).toBe(`${DATE_MON}T20:00:00`)
+        expect(events[0]!.end).toBe(`${DATE_TUE}T04:00:00`)
+      })
+
+      test('event attached to multiple resources appears in each resource bucket', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          resources: [allDayResource, afternoonResource],
+          events: [
+            {
+              id: 'shared',
+              title: 'Shared',
+              start: `${DATE_MON}T13:00:00`,
+              end: `${DATE_MON}T14:00:00`,
+              resources: [allDayResource, afternoonResource],
+            },
+          ],
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const byResource = cal.getEventsByResource()
+        expect(byResource.get('r3')!.map((e) => e.id)).toContain('shared')
+        expect(byResource.get('r2')!.map((e) => e.id)).toContain('shared')
+      })
+    })
+
+    describe('formatPeriodLabel', () => {
+      test('returns a non-empty string for a normal week view', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          locale: 'en-US',
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const label = cal.formatPeriodLabel()
+        expect(typeof label).toBe('string')
+        expect(label.length).toBeGreaterThan(0)
+      })
+
+      test('uses an em-dash range separator when spanning multiple days', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          locale: 'en-US',
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const label = cal.formatPeriodLabel()
+        expect(label).toContain('\u2014')
+      })
+
+      test('accepts a locale override', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          locale: 'en-US',
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const en = cal.formatPeriodLabel({ locale: 'en-US' })
+        const de = cal.formatPeriodLabel({ locale: 'de-DE' })
+        expect(en).not.toBe(de)
+      })
+    })
+
+    describe('getEventProps', () => {
+      test('returns a result with start/end and overlappingEvents for a visible event', () => {
+        const event: TestEvent = {
+          id: 'e1',
+          title: 'Event',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        }
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          events: [event],
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const props = cal.getEventProps(cal.getEvents()[0]!)
+        expect(props.start).toBe(`${DATE_MON}T09:00:00`)
+        expect(props.end).toBe(`${DATE_MON}T10:00:00`)
+        expect(Array.isArray(props.overlappingEvents)).toBe(true)
+      })
+
+      test('detects overlap with a sibling event', () => {
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+            },
+            {
+              id: 'e2',
+              title: 'E2',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+            },
+          ],
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const props = cal.getEventProps(
+          cal.getEvents().find((e) => e.id === 'e1')!,
+        )
+        expect(props.overlappingEvents.some((e) => e.id === 'e2')).toBe(true)
+      })
+
+      test('renders an event at its true height (no min-height floor)', () => {
+        // Regression: a min-height floor padded the box downward from the
+        // start, so the rendered bottom (start + floor) did not match the real
+        // end. Resizing one edge then revealed the true size, making the other
+        // (fixed) edge jump. Geometry must be exactly proportional.
+        const cal = createCalendar({
+          viewMode: { value: 1, unit: 'week' },
+          events: [
+            {
+              id: 'e1',
+              title: 'Short',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T09:20:00`, // 20 min
+            },
+          ],
+        })
+        cal.goToSpecificPeriod(DATE_MON)
+
+        const props = cal.getEventProps(cal.getEvents()[0]!) as {
+          style: { top: string; height: string }
+        }
+        expect(props.style.top).toBe(`${(540 / 1440) * 100}%`)
+        expect(props.style.height).toBe(`${(20 / 1440) * 100}%`)
+      })
+
+      test('top-edge resize keeps the bottom (end) fixed at the real end', () => {
+        const day = DATE_MON
+        const originalEnd = `${day}T09:20:00`
+        const realBottom = (560 / 1440) * 100 // 09:20
+
+        for (const previewStart of [
+          `${day}T08:57:00`,
+          `${day}T08:45:00`,
+          `${day}T08:00:00`,
+        ]) {
+          const preview = calculateSegmentResizePreview({
+            dayDate: day,
+            originalStart: `${day}T09:00:00`,
+            originalEnd,
+            previewStart,
+            previewEnd: originalEnd,
+          })
+          expect(preview.previewStyle).not.toBeNull()
+          const top = parseFloat(preview.previewStyle!.top)
+          const height = parseFloat(preview.previewStyle!.height)
+          // bottom = top + height stays exactly at the real end — no drift.
+          expect(top + height).toBeCloseTo(realBottom, 6)
+        }
+      })
+
+      test('bottom-edge resize keeps the start (top) fixed at the real start', () => {
+        const day = DATE_MON
+        const originalStart = `${day}T09:00:00`
+        const realTop = (540 / 1440) * 100
+
+        const preview = calculateSegmentResizePreview({
+          dayDate: day,
+          originalStart,
+          originalEnd: `${day}T09:20:00`,
+          previewStart: originalStart,
+          previewEnd: `${day}T10:30:00`,
+        })
+        expect(preview.previewStyle).not.toBeNull()
+        expect(parseFloat(preview.previewStyle!.top)).toBeCloseTo(realTop, 6)
+      })
+    })
+
+    describe('commitUpdate backward cascade - FF and SF', () => {
+      test('FF: pulls predecessor back when successor.end moves before predecessor.end', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T13:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T12:00:00`,
+              end: `${DATE_MON}T14:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FF' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('s', {
+          start: `${DATE_MON}T10:00:00`,
+          end: `${DATE_MON}T12:00:00`,
+        })
+
+        const p = cal.getEvents().find((e) => e.id === 'p')!
+        expect(p.start).toBe(`${DATE_MON}T10:00:00`)
+        expect(p.end).toBe(`${DATE_MON}T12:00:00`)
+      })
+
+      test('SF: pulls predecessor back when successor.end moves before predecessor.start', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'SF' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        cal.commitUpdate('s', {
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        })
+
+        const p = cal.getEvents().find((e) => e.id === 'p')!
+        expect(p.start).toBe(`${DATE_MON}T10:00:00`)
+        expect(p.end).toBe(`${DATE_MON}T11:00:00`)
+      })
+    })
+
+    describe('validateMove backward cascade - allowed when target available', () => {
+      test('FS: allows move when predecessor pull-back stays within availability', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T12:00:00`,
+              end: `${DATE_MON}T13:00:00`,
+              resources: [allDayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+          ],
+          resources: [allDayResource],
+        })
+
+        const r = cal.validateMove(
+          's',
+          `${DATE_MON}T10:30:00`,
+          `${DATE_MON}T11:30:00`,
+        )
+        expect(r.blocked).toBe(false)
+      })
+    })
+
+    describe('validateResize bottom-edge cascade through dependents', () => {
+      const baseResizeOptions = {
+        constraints: { snapToMinutes: 15, minDurationMinutes: 15 },
+      }
+
+      test('blocks bottom-edge extension when dependent would be pushed into unavailable hours', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [weekdayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const r = cal.validateResize({
+          eventId: 'p',
+          originalStart: `${DATE_MON}T09:00:00`,
+          originalEnd: `${DATE_MON}T10:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 420,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(r.blocked).toBe(true)
+      })
+
+      test('allows bottom-edge extension when dependent still fits inside availability', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [weekdayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [weekdayResource],
+              dependsOn: [{ id: 'p', type: 'FS' }],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const r = cal.validateResize({
+          eventId: 'p',
+          originalStart: `${DATE_MON}T09:00:00`,
+          originalEnd: `${DATE_MON}T10:00:00`,
+          edge: 'bottom',
+          totalDeltaMinutes: 60,
+          targetDayDate: DATE_MON,
+          originalDayDate: DATE_MON,
+          ...baseResizeOptions,
+        })
+
+        expect(r.blocked).toBe(false)
+      })
+    })
+
+    describe('capacity edge cases', () => {
+      test('resource with capacity [0] effectively prevents any concurrent usage', () => {
+        const zeroCapResource: TestResource = {
+          id: 'r-zero',
+          label: 'Zero',
+          capacity: [0],
+          availability: [
+            { weekdays: [1, 2, 3, 4, 5], startTime: '09:00', endTime: '17:00' },
+          ],
+        }
+
+        const cal = createCalendar({ resources: [zeroCapResource] })
+
+        const result = cal.validateEventPlacement({
+          title: 'Anything',
+          start: `${DATE_MON}T10:00:00`,
+          end: `${DATE_MON}T11:00:00`,
+          resources: [zeroCapResource],
+          consumption: [1],
+        })
+        expect(result.blocked).toBe(false)
+      })
+
+      test('treats missing event.consumption as [1] when checking against existing usage', () => {
+        const capResource: TestResource = {
+          id: 'r-cap',
+          label: 'Cap1',
+          capacity: [1],
+          availability: [
+            { weekdays: [1, 2, 3, 4, 5], startTime: '09:00', endTime: '17:00' },
+          ],
+        }
+
+        const cal = createCalendar({
+          resources: [capResource],
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T10:00:00`,
+              end: `${DATE_MON}T11:00:00`,
+              resources: [capResource],
+            },
+          ],
+        })
+
+        const result = cal.validateEventPlacement({
+          title: 'E2',
+          start: `${DATE_MON}T10:00:00`,
+          end: `${DATE_MON}T11:00:00`,
+          resources: [capResource],
+        })
+        expect(result.blocked).toBe(true)
+      })
+    })
+
+    describe('partial datetime normalization in commit*', () => {
+      test('commitAdd normalizes "YYYY-MM-DDTHH" form', () => {
+        const cal = createCalendar()
+        cal.commitAdd({
+          id: 'e1',
+          title: 'E',
+          start: `${DATE_MON}T09` as unknown as string,
+          end: `${DATE_MON}T10` as unknown as string,
+        })
+
+        const e = cal.getEvents()[0]!
+        expect(e.start).toBe(`${DATE_MON}T09:00:00`)
+        expect(e.end).toBe(`${DATE_MON}T10:00:00`)
+      })
+
+      test('commitUpdate normalizes "YYYY-MM-DDTHH" form', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            },
+          ],
+        })
+
+        cal.commitUpdate('e1', {
+          start: `${DATE_MON}T11` as unknown as string,
+          end: `${DATE_MON}T12` as unknown as string,
+        })
+
+        const e = cal.getEvents()[0]!
+        expect(e.start).toBe(`${DATE_MON}T11:00:00`)
+        expect(e.end).toBe(`${DATE_MON}T12:00:00`)
+      })
+    })
+
+    describe('createDependency - shape and idempotency edges', () => {
+      test('emits a single event:updated when dependency is added without reschedule', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+              resources: [allDayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T11:00:00`,
+              end: `${DATE_MON}T12:00:00`,
+              resources: [allDayResource],
+            },
+          ],
+          resources: [allDayResource],
+        })
+        emitSpy.mockClear()
+
+        cal.createDependency('p', 's', 'FS')
+
+        const targetUpdates = emitSpy.mock.calls.filter(
+          ([name, payload]) =>
+            name === 'event:updated' && payload.eventId === 's',
+        )
+        expect(targetUpdates.length).toBeGreaterThanOrEqual(1)
+      })
+
+      test('does not modify target when reschedule attempt is blocked', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'p',
+              title: 'P',
+              start: `${DATE_MON}T15:00:00`,
+              end: `${DATE_MON}T16:00:00`,
+              resources: [weekdayResource],
+            },
+            {
+              id: 's',
+              title: 'S',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T16:00:00`,
+              resources: [weekdayResource],
+            },
+          ],
+          resources: [weekdayResource],
+        })
+
+        const result = cal.createDependency('p', 's', 'FS')
+
+        expect(result.blocked).toBe(true)
+        const s = cal.getEvents().find((e) => e.id === 's')!
+        expect(s.dependsOn ?? []).toEqual([])
+        expect(s.start).toBe(`${DATE_MON}T09:00:00`)
+        expect(s.end).toBe(`${DATE_MON}T16:00:00`)
+      })
+    })
+  })
+
+  describe('undo/redo', () => {
+    beforeEach(() => {
+      emitSpy.mockClear()
+    })
+
+    describe('canUndo / canRedo', () => {
+      test('initially both return false', () => {
+        const cal = createCalendar()
+        expect(cal.canUndo()).toBe(false)
+        expect(cal.canRedo()).toBe(false)
+      })
+
+      test('canUndo returns true after commitAdd', () => {
+        const cal = createCalendar()
+        cal.commitAdd({
+          id: 'e1',
+          title: 'E1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        } as TestEvent)
+        expect(cal.canUndo()).toBe(true)
+        expect(cal.canRedo()).toBe(false)
+      })
+    })
+
+    describe('undo', () => {
+      test('undo after commitAdd removes the event', () => {
+        const cal = createCalendar()
+        cal.commitAdd({
+          id: 'e1',
+          title: 'E1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        } as TestEvent)
+        expect(cal.getEvents()).toHaveLength(1)
+        cal.undo()
+        expect(cal.getEvents()).toHaveLength(0)
+      })
+
+      test('undo after commitUpdate restores original event', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Original',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            } as TestEvent,
+          ],
+        })
+        cal.commitUpdate('e1', { title: 'Updated' })
+        expect(cal.getEvents()[0]!.title).toBe('Updated')
+        cal.undo()
+        expect(cal.getEvents()[0]!.title).toBe('Original')
+      })
+
+      test('undo after removeEvent brings back the event', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            } as TestEvent,
+          ],
+        })
+        cal.removeEvent('e1')
+        expect(cal.getEvents()).toHaveLength(0)
+        cal.undo()
+        expect(cal.getEvents()).toHaveLength(1)
+        expect(cal.getEvents()[0]!.id).toBe('e1')
+      })
+
+      test('undo is a no-op when stack is empty', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'E1',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            } as TestEvent,
+          ],
+        })
+        cal.undo()
+        expect(cal.getEvents()).toHaveLength(1)
+      })
+
+      test('multiple undos restore in reverse order', () => {
+        const cal = createCalendar()
+        cal.commitAdd({
+          id: 'e1',
+          title: 'E1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        } as TestEvent)
+        cal.commitAdd({
+          id: 'e2',
+          title: 'E2',
+          start: `${DATE_MON}T11:00:00`,
+          end: `${DATE_MON}T12:00:00`,
+        } as TestEvent)
+        expect(cal.getEvents()).toHaveLength(2)
+        cal.undo()
+        expect(cal.getEvents()).toHaveLength(1)
+        cal.undo()
+        expect(cal.getEvents()).toHaveLength(0)
+      })
+    })
+
+    describe('redo', () => {
+      test('redo after undo reapplies commitAdd', () => {
+        const cal = createCalendar()
+        cal.commitAdd({
+          id: 'e1',
+          title: 'E1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        } as TestEvent)
+        cal.undo()
+        expect(cal.getEvents()).toHaveLength(0)
+        cal.redo()
+        expect(cal.getEvents()).toHaveLength(1)
+        expect(cal.getEvents()[0]!.id).toBe('e1')
+      })
+
+      test('redo after undo reapplies commitUpdate', () => {
+        const cal = createCalendar({
+          events: [
+            {
+              id: 'e1',
+              title: 'Original',
+              start: `${DATE_MON}T09:00:00`,
+              end: `${DATE_MON}T10:00:00`,
+            } as TestEvent,
+          ],
+        })
+        cal.commitUpdate('e1', { title: 'Updated' })
+        cal.undo()
+        expect(cal.getEvents()[0]!.title).toBe('Original')
+        cal.redo()
+        expect(cal.getEvents()[0]!.title).toBe('Updated')
+      })
+
+      test('new action after undo clears redo stack', () => {
+        const cal = createCalendar()
+        cal.commitAdd({
+          id: 'e1',
+          title: 'E1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        } as TestEvent)
+        cal.undo()
+        expect(cal.canRedo()).toBe(true)
+        cal.commitAdd({
+          id: 'e2',
+          title: 'E2',
+          start: `${DATE_MON}T11:00:00`,
+          end: `${DATE_MON}T12:00:00`,
+        } as TestEvent)
+        expect(cal.canRedo()).toBe(false)
+      })
+
+      test('redo is a no-op when stack is empty', () => {
+        const cal = createCalendar()
+        cal.commitAdd({
+          id: 'e1',
+          title: 'E1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        } as TestEvent)
+        cal.redo()
+        expect(cal.getEvents()).toHaveLength(1)
+      })
+
+      test('canRedo returns false after redo exhausts the stack', () => {
+        const cal = createCalendar()
+        cal.commitAdd({
+          id: 'e1',
+          title: 'E1',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        } as TestEvent)
+        cal.undo()
+        cal.redo()
+        expect(cal.canRedo()).toBe(false)
+      })
+    })
+  })
+
+  describe('setResources', () => {
+    test('replaces resources and invalidates availability caches', () => {
+      const cal = createCalendar({ resources: [weekdayResource] })
+      const ranges1 = cal.getUnavailableRanges(DATE_MON, {
+        containerHeight: 1000,
+        resourceIds: [weekdayResource.id],
+      })
+      expect(ranges1.length).toBeGreaterThan(0)
+      cal.setResources([allDayResource])
+      const ranges2 = cal.getUnavailableRanges(DATE_MON, {
+        containerHeight: 1000,
+        resourceIds: [allDayResource.id],
+      })
+      expect(ranges2).toHaveLength(0)
+    })
+
+    test('accepts null to clear resources', () => {
+      const cal = createCalendar({ resources: [weekdayResource] })
+      cal.setResources(null)
+      const ranges = cal.getUnavailableRanges(DATE_MON, {
+        containerHeight: 1000,
+        resourceIds: [weekdayResource.id],
+      })
+      expect(ranges).toHaveLength(0)
+    })
+  })
+
+  describe('setEvents', () => {
+    test('replaces events and invalidates availability caches', () => {
+      const res: TestResource = {
+        id: 'r-cap',
+        label: 'Cap',
+        capacity: [1],
+        availability: [
+          { weekdays: [1, 2, 3, 4, 5], startTime: '09:00', endTime: '17:00' },
+        ],
+      }
+      const cal = createCalendar({
+        resources: [res],
+        events: [
+          {
+            id: 'a',
+            title: 'A',
+            start: `${DATE_MON}T09:00:00`,
+            end: `${DATE_MON}T10:00:00`,
+            resources: [res],
+            consumption: [1],
+          },
+        ],
+      })
+      expect(cal.getEvents()).toHaveLength(1)
+      cal.setEvents([])
+      expect(cal.getEvents()).toHaveLength(0)
+      const result = cal.validateEventPlacement({
+        title: 'New',
+        start: `${DATE_MON}T09:00:00`,
+        end: `${DATE_MON}T10:00:00`,
+        resources: [res],
+        consumption: [1],
+      })
+      expect(result.blocked).toBe(false)
+    })
+
+    test('reindexes after setEvents', () => {
+      const cal = createCalendar({ events: [] as any, resources: [] })
+      cal.setEvents([
+        {
+          id: 'x',
+          title: 'X',
+          start: `${DATE_MON}T09:00:00`,
+          end: `${DATE_MON}T10:00:00`,
+        },
+      ] as any)
+      expect(cal.getEvents()).toHaveLength(1)
+      expect(cal.getEventsByDate(DATE_MON)).toHaveLength(1)
+    })
+  })
+
+  describe('recurrence exceptions', () => {
+    const recurringEvent: TestEvent = {
+      id: 'rec-ex',
+      title: 'Recurring',
+      start: '2025-06-02T09:00:00',
+      end: '2025-06-02T10:00:00',
+      recurrence: { frequency: 'weekly', interval: 1 },
+    }
+
+    test('expands recurring master occurrence and later occurrences', () => {
+      const cal = createCalendar({ events: [recurringEvent] })
+      expect(cal.getEventsByDate('2025-06-02').map((e) => e.id)).toEqual([
+        'rec-ex',
+      ])
+      expect(cal.getEventsByDate('2025-06-09').map((e) => e.id)).toEqual([
+        'rec-ex_1',
+      ])
+    })
+
+    test('EXDATE skips a specific occurrence', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            ...recurringEvent,
+            recurrence: {
+              frequency: 'weekly',
+              interval: 1,
+              exDates: ['2025-06-09T09:00:00'],
+            },
+          },
+        ],
+      })
+
+      expect(cal.getEventsByDate('2025-06-09')).toHaveLength(0)
+      expect(cal.getEventsByDate('2025-06-16')).toHaveLength(1)
+    })
+
+    test('override moves one occurrence while others keep original time', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            ...recurringEvent,
+            recurrence: {
+              frequency: 'weekly',
+              interval: 1,
+              overrides: [
+                {
+                  originalStart: '2025-06-09T09:00:00',
+                  start: '2025-06-10T15:00:00',
+                  end: '2025-06-10T16:00:00',
+                  title: 'Moved Tuesday',
+                },
+              ],
+            },
+          },
+        ],
+      })
+
+      const moved = cal.getEventsByDate('2025-06-10')
+      expect(moved).toHaveLength(1)
+      expect(moved[0]!.start).toBe('2025-06-10T15:00:00')
+      expect(moved[0]!._occurrenceOriginalStart).toBe('2025-06-09T09:00:00')
+      expect(moved[0]!.title).toBe('Moved Tuesday')
+      expect(cal.getEventsByDate('2025-06-17')).toHaveLength(0)
+    })
+
+    test('override and EXDATE can target original master occurrence', () => {
+      const movedCal = createCalendar({
+        events: [
+          {
+            ...recurringEvent,
+            recurrence: {
+              frequency: 'weekly',
+              overrides: [
+                {
+                  originalStart: '2025-06-02T09:00:00',
+                  start: '2025-06-02T15:00:00',
+                  end: '2025-06-02T16:00:00',
+                },
+              ],
+            },
+          },
+        ],
+      })
+      expect(movedCal.getEventsByDate('2025-06-02')[0]!.start).toBe(
+        '2025-06-02T15:00:00',
+      )
+
+      const skippedCal = createCalendar({
+        events: [
+          {
+            ...recurringEvent,
+            recurrence: {
+              frequency: 'weekly',
+              exDates: ['2025-06-02T09:00:00'],
+            },
+          },
+        ],
+      })
+      expect(skippedCal.getEventsByDate('2025-06-02')).toHaveLength(0)
+      expect(skippedCal.getEventsByDate('2025-06-09')).toHaveLength(1)
+    })
+
+    test('COUNT is based on total occurrences, not viewport emissions', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            ...recurringEvent,
+            recurrence: { frequency: 'weekly', count: 2 },
+          },
+        ],
+      })
+
+      expect(cal.getEventsByDate('2025-06-02')).toHaveLength(1)
+      expect(cal.getEventsByDate('2025-06-09')).toHaveLength(1)
+      expect(cal.getEventsByDate('2025-06-16')).toHaveLength(0)
+    })
+
+    test('UNTIL remains exclusive', () => {
+      const cal = createCalendar({
+        events: [
+          {
+            ...recurringEvent,
+            recurrence: { frequency: 'weekly', until: '2025-06-16' },
+          },
+        ],
+      })
+
+      expect(cal.getEventsByDate('2025-06-02')).toHaveLength(1)
+      expect(cal.getEventsByDate('2025-06-09')).toHaveLength(1)
+      expect(cal.getEventsByDate('2025-06-16')).toHaveLength(0)
+    })
+
+    test('editRecurringEvent with scope this creates an override', async () => {
+      const cal = createCalendar({ events: [recurringEvent] })
+
+      const result = await cal.editRecurringEvent(
+        'rec-ex_1',
+        {
+          start: '2025-06-09T15:00:00',
+          end: '2025-06-09T16:00:00',
+          title: 'Moved One',
+        },
+        { scope: 'this', occurrenceStart: '2025-06-09T09:00:00' },
+      )
+
+      expect(result.success).toBe(true)
+      const master = cal.getEvents()[0]!
+      expect(master.recurrence?.overrides).toHaveLength(1)
+      const moved = cal.getEventsByDate('2025-06-09')[0]!
+      expect(moved.start).toBe('2025-06-09T15:00:00')
+      expect(moved.title).toBe('Moved One')
+      expect(cal.getEventsByDate('2025-06-16')[0]!.start).toBe(
+        '2025-06-16T09:00:00',
+      )
+    })
+
+    test('removeRecurringEvent with scope this creates EXDATE', () => {
+      const cal = createCalendar({ events: [recurringEvent] })
+
+      cal.removeRecurringEvent('rec-ex_1', {
+        scope: 'this',
+        occurrenceStart: '2025-06-09T09:00:00',
+      })
+
+      expect(cal.getEvents()[0]!.recurrence?.exDates).toEqual([
+        '2025-06-09T09:00:00',
+      ])
+      expect(cal.getEventsByDate('2025-06-09')).toHaveLength(0)
+      expect(cal.getEventsByDate('2025-06-16')).toHaveLength(1)
+    })
+
+    test('validateResize checks capacity for a recurring occurrence', () => {
+      const room: TestResource = {
+        id: 'rec-room',
+        label: 'Recurring Room',
+        capacity: [1],
+        availability: [
+          {
+            weekdays: [1, 2, 3, 4, 5, 6, 7],
+            startTime: '00:00',
+            endTime: '24:00',
+          },
+        ],
+      }
+      const cal = createCalendar({
+        resources: [room],
+        events: [
+          {
+            ...recurringEvent,
+            resources: [room],
+            consumption: [1],
+          },
+          {
+            id: 'blocker',
+            title: 'Blocker',
+            start: '2025-06-09T10:00:00',
+            end: '2025-06-09T11:00:00',
+            resources: [room],
+            consumption: [1],
+          },
+        ],
+      })
+
+      const result = cal.validateResize({
+        eventId: 'rec-ex_1',
+        originalStart: '2025-06-09T09:00:00',
+        originalEnd: '2025-06-09T10:00:00',
+        edge: 'bottom',
+        totalDeltaMinutes: 60,
+        targetDayDate: '2025-06-09',
+        originalDayDate: '2025-06-09',
+        occurrenceStart: '2025-06-09T09:00:00',
+        constraints: { snapToMinutes: 15, minDurationMinutes: 15 },
+      })
+
+      expect(result.blocked).toBe(true)
+      expect(result.error?.conflicts?.[0]?.resourceDetails[0]?.reason).toBe(
+        'capacity',
+      )
+    })
+
+    test('editRecurringEvent with scope thisAndFollowing splits the series', async () => {
+      const cal = createCalendar({
+        events: [
+          {
+            ...recurringEvent,
+            recurrence: { frequency: 'weekly', count: 5 },
+          },
+        ],
+      })
+
+      const result = await cal.editRecurringEvent(
+        'rec-ex_2',
+        { start: '2025-06-16T15:00:00', end: '2025-06-16T16:00:00' },
+        { scope: 'thisAndFollowing', occurrenceStart: '2025-06-16T09:00:00' },
+      )
+
+      expect(result.success).toBe(true)
+      expect(cal.getEvents()).toHaveLength(2)
+      const [oldMaster, newMaster] = cal.getEvents()
+      expect(oldMaster!.recurrence?.until).toBe('2025-06-16')
+      expect(newMaster!.start).toBe('2025-06-16T15:00:00')
+      expect(newMaster!.recurrence?.count).toBe(3)
+      expect(cal.getEventsByDate('2025-06-09')[0]!.start).toBe(
+        '2025-06-09T09:00:00',
+      )
+      expect(cal.getEventsByDate('2025-06-16')[0]!.start).toBe(
+        '2025-06-16T15:00:00',
+      )
+    })
+
+    test('scope all updates or removes master event', async () => {
+      const editCal = createCalendar({ events: [recurringEvent] })
+      const editResult = await editCal.editRecurringEvent(
+        'rec-ex_1',
+        { title: 'All Updated' },
+        { scope: 'all' },
+      )
+      expect(editResult.success).toBe(true)
+      expect(editCal.getEvents()[0]!.title).toBe('All Updated')
+
+      const removeCal = createCalendar({ events: [recurringEvent] })
+      removeCal.removeRecurringEvent('rec-ex_1', { scope: 'all' })
+      expect(removeCal.getEvents()).toHaveLength(0)
+    })
+  })
+})
diff --git a/packages/time/src/calendar/types.ts b/packages/time/src/calendar/types.ts
new file mode 100644
index 00000000..bea7cf7b
--- /dev/null
+++ b/packages/time/src/calendar/types.ts
@@ -0,0 +1,280 @@
+import type { Temporal } from '@js-temporal/polyfill'
+import type { DateInput } from '~/date'
+
+export type EventDateTimeInput = string | Date | number
+
+/** How often a recurring event repeats. */
+export type RecurrenceFrequency = 'daily' | 'weekly' | 'monthly' | 'yearly'
+
+/** Supported dependency types for ordering events. */
+export type DependencyType = 'FS' | 'SS' | 'FF' | 'SF'
+
+/** A single dependency from one event to another. */
+export interface EventDependency {
+  id: string
+  type: DependencyType
+}
+
+/** Scope used when editing/removing a recurring event series. */
+export type RecurrenceEditScope = 'this' | 'thisAndFollowing' | 'all'
+
+/** Single-occurrence replacement keyed by the original occurrence start. */
+export interface RecurrenceOverride<TResource extends Resource = Resource> {
+  /** Original occurrence start (RECURRENCE-ID equivalent). */
+  originalStart: EventDateTimeInput
+  /** Optional replacement occurrence id. Defaults to the generated occurrence id. */
+  id?: string
+  start?: EventDateTimeInput
+  end?: EventDateTimeInput
+  title?: string
+  resources?: Array<TResource | string>
+  consumption?: Array<number>
+  dependsOn?: Array<EventDependency>
+  allDay?: boolean
+  [key: string]: unknown
+}
+
+/**
+ * Defines the repetition rule for a recurring event.
+ * Occurrences are expanded automatically by the calendar within the current viewport.
+ */
+export interface RecurrenceRule<TResource extends Resource = Resource> {
+  /** How often the event repeats. */
+  frequency: RecurrenceFrequency
+  /**
+   * Repeat every N frequencies (default 1).
+   * E.g. `{ frequency: 'weekly', interval: 2 }` = every other week.
+   */
+  interval?: number
+  /**
+   * ISO date string (YYYY-MM-DD) — no occurrences start on or after this date.
+   * Takes precedence over `count`.
+   */
+  until?: string
+  /**
+   * Maximum total occurrences to generate (including the original).
+   * Only used when `until` is not set.
+   */
+  count?: number
+  /**
+   * For `weekly` frequency: ISO weekdays (1 = Mon … 7 = Sun) to repeat on.
+   * Defaults to the weekday of the original event start.
+   */
+  byWeekday?: Array<number>
+  /** Specific occurrence starts to exclude (EXDATE). Date-only values match by occurrence date. */
+  exDates?: Array<EventDateTimeInput>
+  /** Per-occurrence replacements keyed by original occurrence start. */
+  overrides?: Array<RecurrenceOverride<TResource>>
+}
+
+export interface Availability {
+  /** Days of the week when available (ISO weekday: 1 = Monday, ..., 7 = Sunday) */
+  weekdays: Array<number>
+  /** Start time in HH:mm format */
+  startTime: string
+  /** End time in HH:mm format */
+  endTime: string
+}
+
+export interface Resource {
+  id: string
+  label: string
+  availability?: Array<Availability>
+  capacity?: Array<number>
+  buffer?: {
+    before?: number
+    after?: number
+  }
+}
+
+/**
+ * Represents the configuration for the current viewing mode of a calendar,
+ * specifying the scale and unit of time.
+ */
+export interface ViewMode {
+  /** The number of units for the view mode. */
+  value: number
+  /** The unit of time that the calendar view should display (month, week, workWeek or day). */
+  unit: 'month' | 'week' | 'day' | 'workWeek'
+}
+
+export interface Event<TResource extends Resource = Resource> {
+  id: string
+  start: EventDateTimeInput
+  end: EventDateTimeInput
+  title: string
+  resources?: Array<TResource | string>
+  consumption?: Array<number>
+  /** Dependency links to other events this event is constrained by.
+   * Each link has an `id` (predecessor event) and a `type` (FS/SS/FF/SF).
+   * When a predecessor's relevant anchor shifts, this event shifts by the same delta. */
+  dependsOn?: Array<EventDependency>
+  /** Defines how and when this event repeats. */
+  recurrence?: RecurrenceRule<TResource>
+  /**
+   * When true, event spans full day(s) and is rendered in the all-day strip
+   * separately from timed events. `start` and `end` are still ISO datetime strings;
+   * for an all-day event use the day's start (00:00:00) and the inclusive day's
+   * end (23:59:59) — or any time within those days. Multi-day all-day events
+   * are split per-day like regular events.
+   */
+  allDay?: boolean
+  /** Original start time before splitting (only set on split segments of multi-day events) */
+  _originalStart?: string
+  /** Original end time before splitting (only set on split segments of multi-day events) */
+  _originalEnd?: string
+  /**
+   * ID of the master recurring event this occurrence was generated from.
+   * Only present on ephemeral occurrence instances (index > 0).
+   */
+  _recurringMasterId?: string
+  /** 0-based index of this occurrence within the recurring series. */
+  _occurrenceIndex?: number
+  /** Original occurrence start before EXDATE/override changes. */
+  _occurrenceOriginalStart?: string
+}
+
+export type Day<
+  TResource extends Resource = Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+> = {
+  date: Temporal.PlainDate
+  /** Pre-computed ISO date string (YYYY-MM-DD) — use instead of manually formatting `date` */
+  isoDate: string
+  /** Timed events occurring on this day (sub-day events + segments of timed multi-day events). */
+  events: Array<TEvent>
+  /** All-day events occurring on this day (segments of multi-day all-day events included). */
+  allDayEvents: Array<TEvent>
+  isToday: boolean
+  isInCurrentPeriod: boolean
+}
+
+export interface DateRange {
+  start: DateInput | null
+  end: DateInput | null
+}
+
+export interface TimeSlot {
+  hour: number
+  minute: number
+  label: string
+}
+
+export interface UnavailableRange {
+  /** Top position in pixels */
+  top: number
+  /** Height in pixels */
+  height: number
+  /** Start time as HH:mm string */
+  startTime: string
+  /** End time as HH:mm string */
+  endTime: string
+}
+
+export interface CalendarStore {
+  currentPeriod: Temporal.PlainDate
+  activeDate: Temporal.PlainDate
+  viewMode: ViewMode
+  eventsVersion: number
+  /** True while an async fetchEvents call is in-flight for the current viewport. */
+  isPending: boolean
+}
+
+/**
+ * Information about why a resource is unavailable
+ */
+export interface UnavailabilityReason {
+  /** Resource ID */
+  resourceId: string
+  /** Resource label/name */
+  resourceLabel: string
+  /** Why the resource is unavailable */
+  reason: 'outside-hours' | 'capacity' | 'no-availability'
+  /** Human-readable explanation */
+  description: string
+  /** Current capacity usage if applicable */
+  capacityInfo?: {
+    max: number
+    used: number
+    remaining: number
+  }
+}
+
+/**
+ * Information about a specific availability conflict
+ */
+export interface AvailabilityConflict {
+  /** The date where the conflict occurred (YYYY-MM-DD) */
+  date: string
+  /** Time range that conflicts with availability */
+  conflictRange: {
+    start: string
+    end: string
+  }
+  /** The resource(s) whose availability is being violated */
+  resourceIds: Array<string>
+  /** Detailed reasons for each resource */
+  resourceDetails: Array<UnavailabilityReason>
+  /** Human-readable description of the conflict */
+  description: string
+}
+
+/**
+ * Error information when a resize operation is blocked
+ */
+export interface ResizeError {
+  eventId: string
+  eventTitle: string
+  reason: 'unavailable-time' | 'invalid-time' | 'min-duration' | 'blocked'
+  message: string
+  originalStart: string
+  originalEnd: string
+  attemptedStart?: string
+  attemptedEnd?: string
+  /** Specific availability conflicts that prevented the resize */
+  conflicts?: Array<AvailabilityConflict>
+}
+
+/**
+ * Result of checking if a resize is valid
+ */
+export interface ResizeValidationResult {
+  valid: boolean
+  error?: ResizeError
+}
+
+/** Result of a {@link CalendarActions.saveEvent} call. */
+export type SaveEventResult =
+  | { success: true }
+  | { success: false; error: ResizeError }
+
+export interface TimelineEventLayout<
+  TResource extends Resource = Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+> {
+  event: TEvent
+  left: number
+  width: number
+  lane: number
+  /** True when the event starts before the first visible day (left edge is clipped) */
+  isStartClipped: boolean
+  /** True when the event ends after the last visible day (right edge is clipped) */
+  isEndClipped: boolean
+}
+
+export interface TimelineResourceRow<
+  TResource extends Resource = Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+> {
+  resource: TResource
+  events: Array<TimelineEventLayout<TResource, TEvent>>
+  laneCount: number
+}
+
+export interface TimelineLayout<
+  TResource extends Resource = Resource,
+  TEvent extends Event<TResource> = Event<TResource>,
+> {
+  rows: Array<TimelineResourceRow<TResource, TEvent>>
+  currentTimePosition: number | null
+}
diff --git a/packages/time/src/client/TimeClient.ts b/packages/time/src/client/TimeClient.ts
new file mode 100644
index 00000000..19c70a72
--- /dev/null
+++ b/packages/time/src/client/TimeClient.ts
@@ -0,0 +1,91 @@
+import { EventClient } from '@tanstack/devtools-event-client'
+import type {
+  AvailabilityConflict,
+  UnavailabilityReason,
+} from '../calendar/types'
+
+export interface TimeEventInfo {
+  eventId: string
+  eventTitle: string
+  start: string
+  end: string
+}
+
+/**
+ * Event map for TimeClient events
+ */
+export interface TimeEventMap {
+  'time:event:added': TimeEventInfo
+  'time:events:set': {
+    events: Array<TimeEventInfo>
+  }
+  'time:event:updated': TimeEventInfo & {
+    updates: Record<string, unknown>
+  }
+  'time:event:removed': TimeEventInfo
+  'time:event:undo': {
+    added: Array<TimeEventInfo>
+    removed: Array<TimeEventInfo>
+    updated: Array<TimeEventInfo>
+  }
+  'time:event:redo': {
+    added: Array<TimeEventInfo>
+    removed: Array<TimeEventInfo>
+    updated: Array<TimeEventInfo>
+  }
+  'time:event:resized': TimeEventInfo
+  'time:event:update:error': {
+    eventId: string
+    eventTitle: string
+    reason: 'unavailable-time' | 'invalid-time' | 'min-duration' | 'blocked'
+    message: string
+    originalStart: string
+    originalEnd: string
+    attemptedStart?: string
+    attemptedEnd?: string
+    conflicts?: Array<AvailabilityConflict>
+  }
+  'time:calendar:navigate': {
+    direction: 'previous' | 'next' | 'current' | 'specific'
+    targetDate: string
+  }
+  'time:calendar:viewMode:changed': {
+    viewMode: {
+      value: number
+      unit: string
+    }
+  }
+}
+
+/**
+ * TimeClient extends EventClient to provide typed events for calendar operations
+ * Used by devtools to monitor and display activity
+ */
+class TimeClient extends EventClient<TimeEventMap> {
+  private static instance: TimeClient | null = null
+
+  private constructor() {
+    super({
+      pluginId: 'time',
+    })
+  }
+
+  /**
+   * Get the singleton instance
+   */
+  static getInstance(): TimeClient {
+    if (!TimeClient.instance) {
+      TimeClient.instance = new TimeClient()
+    }
+    return TimeClient.instance
+  }
+}
+
+/**
+ * Get the global TimeClient instance
+ */
+export function getTimeClient(): TimeClient {
+  return TimeClient.getInstance()
+}
+
+export type { AvailabilityConflict, UnavailabilityReason }
diff --git a/packages/time/src/client/index.ts b/packages/time/src/client/index.ts
new file mode 100644
index 00000000..10cef5e5
--- /dev/null
+++ b/packages/time/src/client/index.ts
@@ -0,0 +1 @@
+export * from './TimeClient'
diff --git a/packages/time/src/date/add/add.ts b/packages/time/src/date/add/add.ts
new file mode 100644
index 00000000..e5761364
--- /dev/null
+++ b/packages/time/src/date/add/add.ts
@@ -0,0 +1,17 @@
+import { withDateOperation } from '../withDateOperation'
+import type { DateOperationOptions } from '../withDateOperation'
+import type { DateInput, DurationLike } from '../types'
+
+export interface AddOptions extends DateOperationOptions {
+  duration: DurationLike
+}
+
+/**
+ * add
+ * Adds a duration to a date/time instance
+ */
+export function add(input: DateInput, options: AddOptions) {
+  return withDateOperation<AddOptions>((zdt, { duration }) => {
+    return zdt.add(duration)
+  })(input, options)
+}
diff --git a/packages/time/src/date/add/index.ts b/packages/time/src/date/add/index.ts
new file mode 100644
index 00000000..2bed2c4c
--- /dev/null
+++ b/packages/time/src/date/add/index.ts
@@ -0,0 +1 @@
+export * from './add'
diff --git a/packages/time/src/date/add/tests/add.test.ts b/packages/time/src/date/add/tests/add.test.ts
new file mode 100644
index 00000000..63fd7984
--- /dev/null
+++ b/packages/time/src/date/add/tests/add.test.ts
@@ -0,0 +1,191 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { add } from '../add'
+
+describe('add', () => {
+  describe('with string input', () => {
+    test('should add days', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { days: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-16T14:42:12.789Z')
+    })
+
+    test('should add multiple days', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { days: 7 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-22T14:42:12.789Z')
+    })
+
+    test('should add hours', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { hours: 2 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T16:42:12.789Z')
+    })
+
+    test('should add minutes', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { minutes: 30 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T15:12:12.789Z')
+    })
+
+    test('should add seconds', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { seconds: 45 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:57.789Z')
+    })
+
+    test('should add milliseconds', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { milliseconds: 100 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:12.889Z')
+    })
+
+    test('should add months', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { months: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-04-15T14:42:12.789Z')
+    })
+
+    test('should add years', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { years: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2025-03-15T14:42:12.789Z')
+    })
+
+    test('should add weeks', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { weeks: 2 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-29T14:42:12.789Z')
+    })
+  })
+
+  describe('with complex duration', () => {
+    test('should add multiple duration units', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { days: 1, hours: 2, minutes: 30 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-16T17:12:12.789Z')
+    })
+
+    test('should handle year and month addition', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { years: 1, months: 2 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2025-05-15T14:42:12.789Z')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle month end correctly', () => {
+      const result = add('2024-01-31T00:00:00Z', {
+        duration: { months: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-02-29T00:00:00Z')
+    })
+
+    test('should handle leap year correctly', () => {
+      const result = add('2024-02-29T00:00:00Z', {
+        duration: { years: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2025-02-28T00:00:00Z')
+    })
+
+    test('should handle negative duration (subtraction)', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { days: -1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-14T14:42:12.789Z')
+    })
+
+    test('should handle zero duration', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { days: 0 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:12.789Z')
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date object', () => {
+      const date = new Date('2024-03-15T14:42:12.789Z')
+      const result = add(date, {
+        duration: { days: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-16T14:42:12.789Z')
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2024-03-15T14:42:12.789Z').getTime()
+      const result = add(epoch, {
+        duration: { days: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-16T14:42:12.789Z')
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const result = add(zdt, {
+        duration: { days: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-16T14:42:12.789Z')
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { hours: 1 },
+        timeZone: 'America/New_York',
+      })
+      expect(result.options.timeZone).toBe('America/New_York')
+      expect(result.value).toContain('2024-03-15')
+    })
+
+    test('should return timezone in options', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { days: 1 },
+        timeZone: 'Asia/Tokyo',
+      })
+      expect(result.options.timeZone).toBe('Asia/Tokyo')
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = add('2024-03-15T14:42:12.789Z', {
+        duration: { days: 1 },
+        calendar: 'japanese',
+      })
+      expect(result.options.calendar).toBe('japanese')
+    })
+  })
+})
diff --git a/packages/time/src/date/ceil/ceil.ts b/packages/time/src/date/ceil/ceil.ts
new file mode 100644
index 00000000..8873b748
--- /dev/null
+++ b/packages/time/src/date/ceil/ceil.ts
@@ -0,0 +1,22 @@
+import { withDateOperation } from '../withDateOperation'
+import type { DateOperationOptions } from '../withDateOperation'
+import type { DateInput } from '../types'
+
+export type CeilUnit =
+  | 'day'
+  | 'hour'
+  | 'minute'
+  | 'second'
+  | 'millisecond'
+  | 'microsecond'
+  | 'nanosecond'
+
+export interface CeilOptions extends DateOperationOptions {
+  unit: CeilUnit
+}
+
+export function ceil(input: DateInput, options: CeilOptions) {
+  return withDateOperation<CeilOptions>((zdt, { unit }) => {
+    return zdt.round({ smallestUnit: unit, roundingMode: 'ceil' })
+  })(input, options)
+}
diff --git a/packages/time/src/date/ceil/index.ts b/packages/time/src/date/ceil/index.ts
new file mode 100644
index 00000000..f35832bd
--- /dev/null
+++ b/packages/time/src/date/ceil/index.ts
@@ -0,0 +1 @@
+export * from './ceil'
diff --git a/packages/time/src/date/ceil/tests/ceil.test.ts b/packages/time/src/date/ceil/tests/ceil.test.ts
new file mode 100644
index 00000000..408a92e9
--- /dev/null
+++ b/packages/time/src/date/ceil/tests/ceil.test.ts
@@ -0,0 +1,141 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { ceil } from '../ceil'
+
+describe('ceil', () => {
+  describe('with string input', () => {
+    test('should ceil up to next day', () => {
+      const result = ceil('2024-03-15T10:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-16T00:00:00Z')
+    })
+
+    test('should ceil up to next hour', () => {
+      const result = ceil('2024-03-15T14:20:00Z', {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T15:00:00Z')
+    })
+
+    test('should ceil up to next minute', () => {
+      const result = ceil('2024-03-15T14:42:30Z', {
+        unit: 'minute',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:43:00Z')
+    })
+
+    test('should ceil up to next second', () => {
+      const result = ceil('2024-03-15T14:42:12.500Z', {
+        unit: 'second',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:13Z')
+    })
+
+    test('should keep millisecond boundary for string input', () => {
+      const result = ceil('2024-03-15T14:42:12.789Z', {
+        unit: 'millisecond',
+        timeZone: 'UTC',
+      })
+      const ceiled = result.asZonedDateTime()
+      expect(ceiled.millisecond).toBe(789)
+      expect(ceiled.microsecond).toBe(0)
+      expect(ceiled.nanosecond).toBe(0)
+    })
+
+    test('should not change when already at boundary', () => {
+      const result = ceil('2024-03-15T00:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T00:00:00Z')
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const date = new Date('2024-03-15T14:20:00Z')
+      const result = ceil(date, {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T15:00:00Z')
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2024-03-15T14:20:00Z').getTime()
+      const result = ceil(epoch, {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T15:00:00Z')
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:20:00Z[UTC][u-ca=gregory]',
+      )
+      const result = ceil(zdt, {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T15:00:00Z')
+    })
+
+    test('should ceil sub-millisecond with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:42:12.789456789Z[UTC][u-ca=gregory]',
+      )
+      const result = ceil(zdt, {
+        unit: 'millisecond',
+        timeZone: 'UTC',
+      })
+      const ceiled = result.asZonedDateTime()
+      expect(ceiled.millisecond).toBe(790)
+      expect(ceiled.microsecond).toBe(0)
+      expect(ceiled.nanosecond).toBe(0)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = ceil('2024-03-15T14:20:00Z', {
+        unit: 'hour',
+        timeZone: 'America/New_York',
+      })
+      expect(result.timeZone).toBe('America/New_York')
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = ceil('2024-03-15T14:20:00Z', {
+        unit: 'hour',
+        calendar: 'japanese',
+      })
+      expect(result.calendar).toBe('japanese')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle year boundary', () => {
+      const result = ceil('2024-12-31T12:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2025-01-01T00:00:00Z')
+    })
+
+    test('should handle month boundary', () => {
+      const result = ceil('2024-02-29T12:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+  })
+})
diff --git a/packages/time/src/date/clamp/clamp.ts b/packages/time/src/date/clamp/clamp.ts
new file mode 100644
index 00000000..ac58042f
--- /dev/null
+++ b/packages/time/src/date/clamp/clamp.ts
@@ -0,0 +1,29 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { toZonedDateTime } from '../helpers'
+import { createDateOperationResult, resolveOptions } from '../withDateOperation'
+import type { DateInput, DateOptions, Range } from '../types'
+
+export interface ClampOptions extends DateOptions {
+  range: Range
+}
+
+export function clamp(input: DateInput, options: ClampOptions) {
+  const resolved = resolveOptions(options)
+  const {
+    range: { start, end },
+  } = options
+
+  const zdt = toZonedDateTime(input, resolved.timeZone, resolved.calendar)
+  const startZdt = toZonedDateTime(start, resolved.timeZone, resolved.calendar)
+  const endZdt = toZonedDateTime(end, resolved.timeZone, resolved.calendar)
+
+  if (Temporal.ZonedDateTime.compare(zdt, startZdt) < 0) {
+    return createDateOperationResult(startZdt, resolved)
+  }
+
+  if (Temporal.ZonedDateTime.compare(zdt, endZdt) > 0) {
+    return createDateOperationResult(endZdt, resolved)
+  }
+
+  return createDateOperationResult(zdt, resolved)
+}
diff --git a/packages/time/src/date/clamp/index.ts b/packages/time/src/date/clamp/index.ts
new file mode 100644
index 00000000..2620f634
--- /dev/null
+++ b/packages/time/src/date/clamp/index.ts
@@ -0,0 +1 @@
+export * from './clamp'
diff --git a/packages/time/src/date/clamp/tests/clamp.test.ts b/packages/time/src/date/clamp/tests/clamp.test.ts
new file mode 100644
index 00000000..7937d95b
--- /dev/null
+++ b/packages/time/src/date/clamp/tests/clamp.test.ts
@@ -0,0 +1,143 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { clamp } from '../clamp'
+
+describe('clamp', () => {
+  describe('with string input', () => {
+    test('should return date when within range', () => {
+      const result = clamp('2024-03-15T00:00:00Z', {
+        range: {
+          start: '2024-03-01T00:00:00Z',
+          end: '2024-03-31T00:00:00Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T00:00:00Z')
+    })
+
+    test('should clamp to start when before range', () => {
+      const result = clamp('2024-02-15T00:00:00Z', {
+        range: {
+          start: '2024-03-01T00:00:00Z',
+          end: '2024-03-31T00:00:00Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should clamp to end when after range', () => {
+      const result = clamp('2024-04-15T00:00:00Z', {
+        range: {
+          start: '2024-03-01T00:00:00Z',
+          end: '2024-03-31T00:00:00Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-31T00:00:00Z')
+    })
+
+    test('should clamp to start when equal to start', () => {
+      const result = clamp('2024-03-01T00:00:00Z', {
+        range: {
+          start: '2024-03-01T00:00:00Z',
+          end: '2024-03-31T00:00:00Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should clamp to end when equal to end', () => {
+      const result = clamp('2024-03-31T00:00:00Z', {
+        range: {
+          start: '2024-03-01T00:00:00Z',
+          end: '2024-03-31T00:00:00Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-31T00:00:00Z')
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const result = clamp(new Date('2024-02-15T00:00:00Z'), {
+        range: {
+          start: new Date('2024-03-01T00:00:00Z'),
+          end: new Date('2024-03-31T00:00:00Z'),
+        },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should work with epoch time', () => {
+      const result = clamp(new Date('2024-02-15T00:00:00Z').getTime(), {
+        range: {
+          start: new Date('2024-03-01T00:00:00Z').getTime(),
+          end: new Date('2024-03-31T00:00:00Z').getTime(),
+        },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-02-15T00:00:00Z[UTC][u-ca=gregory]',
+      )
+      const result = clamp(zdt, {
+        range: {
+          start: Temporal.ZonedDateTime.from(
+            '2024-03-01T00:00:00Z[UTC][u-ca=gregory]',
+          ),
+          end: Temporal.ZonedDateTime.from(
+            '2024-03-31T00:00:00Z[UTC][u-ca=gregory]',
+          ),
+        },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = clamp('2024-02-15T00:00:00Z', {
+        range: {
+          start: '2024-03-01T00:00:00Z',
+          end: '2024-03-31T00:00:00Z',
+        },
+        timeZone: 'America/New_York',
+      })
+      expect(result.timeZone).toBe('America/New_York')
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = clamp('2024-02-15T00:00:00Z', {
+        range: {
+          start: '2024-03-01T00:00:00Z',
+          end: '2024-03-31T00:00:00Z',
+        },
+        calendar: 'japanese',
+      })
+      expect(result.calendar).toBe('japanese')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle single day range', () => {
+      const result = clamp('2024-03-15T00:00:00Z', {
+        range: {
+          start: '2024-03-10T00:00:00Z',
+          end: '2024-03-10T00:00:00Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-10T00:00:00Z')
+    })
+  })
+})
diff --git a/packages/time/src/date/count/count.ts b/packages/time/src/date/count/count.ts
new file mode 100644
index 00000000..44ca6553
--- /dev/null
+++ b/packages/time/src/date/count/count.ts
@@ -0,0 +1,41 @@
+import { startOf } from '../startOf'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export type CountUnit =
+  | 'year'
+  | 'month'
+  | 'week'
+  | 'day'
+  | 'hour'
+  | 'minute'
+  | 'second'
+  | 'millisecond'
+
+export interface CountOptions extends DateOptions {
+  unit: CountUnit
+}
+
+export function count(
+  start: DateInput,
+  end: DateInput,
+  options: CountOptions,
+): number {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const {
+    unit,
+    timeZone = defaultTimeZone,
+    calendar = defaultCalendar,
+  } = options
+
+  const startZdt = startOf(start, {
+    unit,
+    timeZone,
+    calendar,
+  }).asZonedDateTime()
+  const endZdt = startOf(end, { unit, timeZone, calendar }).asZonedDateTime()
+
+  const duration = startZdt.until(endZdt)
+  return duration.total({ unit, relativeTo: startZdt })
+}
diff --git a/packages/time/src/date/count/index.ts b/packages/time/src/date/count/index.ts
new file mode 100644
index 00000000..35d0d3aa
--- /dev/null
+++ b/packages/time/src/date/count/index.ts
@@ -0,0 +1 @@
+export * from './count'
diff --git a/packages/time/src/date/count/tests/count.test.ts b/packages/time/src/date/count/tests/count.test.ts
new file mode 100644
index 00000000..7f3f7e32
--- /dev/null
+++ b/packages/time/src/date/count/tests/count.test.ts
@@ -0,0 +1,155 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { count } from '../count'
+
+describe('count', () => {
+  describe('with day unit', () => {
+    test('should count days between two dates', () => {
+      const result = count('2024-03-01T00:00:00Z', '2024-03-31T00:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(30)
+    })
+
+    test('should count zero when same day', () => {
+      const result = count('2024-03-15T12:00:00Z', '2024-03-15T18:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(0)
+    })
+
+    test('should count one day when crossing midnight', () => {
+      const result = count('2024-03-15T12:00:00Z', '2024-03-16T00:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(1)
+    })
+  })
+
+  describe('with month unit', () => {
+    test('should count months between two dates', () => {
+      const result = count('2024-01-15T00:00:00Z', '2024-05-01T00:00:00Z', {
+        unit: 'month',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(4)
+    })
+
+    test('should count zero when same month', () => {
+      const result = count('2024-03-01T00:00:00Z', '2024-03-31T00:00:00Z', {
+        unit: 'month',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(0)
+    })
+  })
+
+  describe('with year unit', () => {
+    test('should count years between two dates', () => {
+      const result = count('2024-06-01T00:00:00Z', '2026-01-01T00:00:00Z', {
+        unit: 'year',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(2)
+    })
+
+    test('should count zero when same year', () => {
+      const result = count('2024-01-01T00:00:00Z', '2024-12-31T00:00:00Z', {
+        unit: 'year',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(0)
+    })
+  })
+
+  describe('with hour unit', () => {
+    test('should count hours between two times', () => {
+      const result = count('2024-03-01T00:00:00Z', '2024-03-01T12:00:00Z', {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(12)
+    })
+  })
+
+  describe('with week unit', () => {
+    test('should count weeks between two dates', () => {
+      const result = count('2024-03-01T00:00:00Z', '2024-03-29T00:00:00Z', {
+        unit: 'week',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(4)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const result = count(
+        new Date('2024-03-01T00:00:00Z'),
+        new Date('2024-03-31T00:00:00Z'),
+        { unit: 'day', timeZone: 'UTC' },
+      )
+      expect(result).toBe(30)
+    })
+
+    test('should work with epoch time', () => {
+      const start = new Date('2024-03-01T00:00:00Z').getTime()
+      const end = new Date('2024-03-31T00:00:00Z').getTime()
+      const result = count(start, end, { unit: 'day', timeZone: 'UTC' })
+      expect(result).toBe(30)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const start = Temporal.ZonedDateTime.from(
+        '2024-03-01T00:00:00Z[UTC][u-ca=gregory]',
+      )
+      const end = Temporal.ZonedDateTime.from(
+        '2024-03-31T00:00:00Z[UTC][u-ca=gregory]',
+      )
+      const result = count(start, end, { unit: 'day', timeZone: 'UTC' })
+      expect(result).toBe(30)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = count('2024-03-01T00:00:00Z', '2024-03-31T00:00:00Z', {
+        unit: 'day',
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(30)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = count('2024-03-01T00:00:00Z', '2024-03-31T00:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+        calendar: 'japanese',
+      })
+      expect(result).toBe(30)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle leap year', () => {
+      const result = count('2024-02-01T00:00:00Z', '2024-03-01T00:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(29)
+    })
+
+    test('should handle negative direction', () => {
+      const result = count('2024-03-31T00:00:00Z', '2024-03-01T00:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(-30)
+    })
+  })
+})
diff --git a/packages/time/src/date/endOf/endOf.ts b/packages/time/src/date/endOf/endOf.ts
new file mode 100644
index 00000000..b469992f
--- /dev/null
+++ b/packages/time/src/date/endOf/endOf.ts
@@ -0,0 +1,95 @@
+import { withDateOperation } from '../withDateOperation'
+import type { DateOperationOptions } from '../withDateOperation'
+import type { DateInput } from '../types'
+
+export type EndOfUnit =
+  | 'year'
+  | 'month'
+  | 'week'
+  | 'day'
+  | 'hour'
+  | 'minute'
+  | 'second'
+  | 'millisecond'
+
+export interface EndOfOptions extends DateOperationOptions {
+  unit: EndOfUnit
+}
+
+/**
+ * endOf
+ * Returns the end of a given unit for a date/time instance
+ */
+export function endOf(input: DateInput, options: EndOfOptions) {
+  return withDateOperation<EndOfOptions>((zdt, { unit }) => {
+    switch (unit) {
+      case 'year':
+        return zdt.with({
+          month: 12,
+          day: 31,
+          hour: 23,
+          minute: 59,
+          second: 59,
+          millisecond: 999,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      case 'month': {
+        const daysInMonth = zdt.daysInMonth
+        return zdt.with({
+          day: daysInMonth,
+          hour: 23,
+          minute: 59,
+          second: 59,
+          millisecond: 999,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      }
+      case 'week': {
+        const dayOfWeek = zdt.dayOfWeek
+        const daysToAdd = dayOfWeek === 7 ? 0 : 7 - dayOfWeek
+        const endOfWeekDay =
+          daysToAdd === 0 ? zdt : zdt.add({ days: daysToAdd })
+        return endOfWeekDay.with({
+          hour: 23,
+          minute: 59,
+          second: 59,
+          millisecond: 999,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      }
+      case 'day':
+        return zdt.with({
+          hour: 23,
+          minute: 59,
+          second: 59,
+          millisecond: 999,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      case 'hour':
+        return zdt.with({
+          minute: 59,
+          second: 59,
+          millisecond: 999,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      case 'minute':
+        return zdt.with({
+          second: 59,
+          millisecond: 999,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      case 'second':
+        return zdt.with({ millisecond: 999, microsecond: 0, nanosecond: 0 })
+      case 'millisecond':
+        return zdt.with({ microsecond: 999, nanosecond: 0 })
+      default:
+        return zdt
+    }
+  })(input, options)
+}
diff --git a/packages/time/src/date/endOf/index.ts b/packages/time/src/date/endOf/index.ts
new file mode 100644
index 00000000..ee08e133
--- /dev/null
+++ b/packages/time/src/date/endOf/index.ts
@@ -0,0 +1 @@
+export * from './endOf'
diff --git a/packages/time/src/date/endOf/tests/endOf.test.ts b/packages/time/src/date/endOf/tests/endOf.test.ts
new file mode 100644
index 00000000..fce14379
--- /dev/null
+++ b/packages/time/src/date/endOf/tests/endOf.test.ts
@@ -0,0 +1,134 @@
+import { describe, expect, test } from 'vitest'
+import { endOf } from '../endOf'
+
+describe('endOf', () => {
+  describe('with string input', () => {
+    test('should return end of year', () => {
+      const result = endOf('2024-03-15T14:42:12.789Z', {
+        unit: 'year',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-12-31T23:59:59.999Z')
+    })
+
+    test('should return end of month', () => {
+      const result = endOf('2024-03-15T14:42:12.789Z', {
+        unit: 'month',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-31T23:59:59.999Z')
+    })
+
+    test('should return end of day', () => {
+      const result = endOf('2024-03-15T14:42:12.789Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T23:59:59.999Z')
+    })
+
+    test('should return end of hour', () => {
+      const result = endOf('2024-03-15T14:42:12.789Z', { unit: 'hour' })
+      expect(result.value).toContain('2024-03-15T14:59:59.999')
+    })
+
+    test('should return end of minute', () => {
+      const result = endOf('2024-03-15T14:42:12.789Z', { unit: 'minute' })
+      expect(result.value).toContain('2024-03-15T14:42:59.999')
+    })
+
+    test('should return end of second', () => {
+      const result = endOf('2024-03-15T14:42:12.789Z', { unit: 'second' })
+      expect(result.value).toContain('2024-03-15T14:42:12.999')
+    })
+
+    test('should return end of millisecond', () => {
+      const result = endOf('2024-03-15T14:42:12.789Z', { unit: 'millisecond' })
+      expect(result.value).toContain('2024-03-15T14:42:12.789')
+    })
+  })
+
+  describe('week calculation', () => {
+    test('should return end of week (Sunday)', () => {
+      // 2024-03-15 is a Friday (day 5), so end of week should be Sunday (2024-03-17)
+      const result = endOf('2024-03-15T14:42:12.789Z', {
+        unit: 'week',
+        timeZone: 'UTC',
+      })
+      const resultDate = new Date(result.value)
+      expect(resultDate.getUTCDay()).toBe(0) // Sunday
+      expect(result.value).toContain('2024-03-17')
+      expect(result.value).toContain('23:59:59.999')
+    })
+
+    test('should return end of week for Sunday', () => {
+      // 2024-03-17 is a Sunday (day 7), so end of week should be itself
+      const result = endOf('2024-03-17T14:42:12.789Z', {
+        unit: 'week',
+        timeZone: 'UTC',
+      })
+      const resultDate = new Date(result.value)
+      expect(resultDate.getUTCDay()).toBe(0) // Sunday
+      expect(result.value).toContain('2024-03-17')
+      expect(result.value).toContain('23:59:59.999')
+    })
+
+    test('should return end of week for Monday', () => {
+      // 2024-03-11 is a Monday (day 1), so end of week should be Sunday (2024-03-17)
+      const result = endOf('2024-03-11T14:42:12.789Z', {
+        unit: 'week',
+        timeZone: 'UTC',
+      })
+      const resultDate = new Date(result.value)
+      expect(resultDate.getUTCDay()).toBe(0) // Sunday
+      expect(result.value).toContain('2024-03-17')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle end of year for December 31st', () => {
+      const result = endOf('2024-12-31T00:00:00Z', {
+        unit: 'year',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-12-31T23:59:59.999Z')
+    })
+
+    test('should handle end of month for last day', () => {
+      const result = endOf('2024-03-31T00:00:00Z', {
+        unit: 'month',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-31T23:59:59.999Z')
+    })
+
+    test('should handle end of month for February in leap year', () => {
+      const result = endOf('2024-02-15T00:00:00Z', {
+        unit: 'month',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-02-29T23:59:59.999Z')
+    })
+
+    test('should handle end of month for February in non-leap year', () => {
+      const result = endOf('2023-02-15T00:00:00Z', {
+        unit: 'month',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2023-02-28T23:59:59.999Z')
+    })
+
+    test('should handle end of day at 23:59:59', () => {
+      const result = endOf('2024-03-15T23:59:59Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T23:59:59.999Z')
+    })
+
+    test('should handle end of hour at 59:59', () => {
+      const result = endOf('2024-03-15T14:59:59Z', { unit: 'hour' })
+      expect(result.value).toContain('2024-03-15T14:59:59.999')
+    })
+  })
+})
diff --git a/packages/time/src/date/equals/equals.ts b/packages/time/src/date/equals/equals.ts
new file mode 100644
index 00000000..880a6b9c
--- /dev/null
+++ b/packages/time/src/date/equals/equals.ts
@@ -0,0 +1,49 @@
+import { normalizeWeek } from '../helpers'
+import { startOf } from '../startOf'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export type EqualsUnit =
+  | 'year'
+  | 'month'
+  | 'week'
+  | 'day'
+  | 'hour'
+  | 'minute'
+  | 'second'
+  | 'millisecond'
+
+export interface EqualsOptions extends DateOptions {}
+
+/**
+ * equals
+ * Returns true if two date/time instances are equal at the specified unit level
+ */
+export function equals(
+  date1: DateInput,
+  date2: DateInput,
+  unit: EqualsUnit,
+  options?: EqualsOptions,
+): boolean {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  const startOf1 = startOf(date1, { unit, timeZone, calendar })
+  const startOf2 = startOf(date2, { unit, timeZone, calendar })
+
+  const zdt1 = startOf1.asZonedDateTime()
+  const zdt2 = startOf2.asZonedDateTime()
+
+  if (unit === 'week') {
+    const normalized1 = normalizeWeek(zdt1)
+    const normalized2 = normalizeWeek(zdt2)
+    return (
+      normalized1.toInstant().epochNanoseconds ===
+      normalized2.toInstant().epochNanoseconds
+    )
+  }
+
+  return zdt1.toInstant().epochNanoseconds === zdt2.toInstant().epochNanoseconds
+}
diff --git a/packages/time/src/date/equals/index.ts b/packages/time/src/date/equals/index.ts
new file mode 100644
index 00000000..cf0ebec5
--- /dev/null
+++ b/packages/time/src/date/equals/index.ts
@@ -0,0 +1 @@
+export * from './equals'
diff --git a/packages/time/src/date/equals/tests/equals.test.ts b/packages/time/src/date/equals/tests/equals.test.ts
new file mode 100644
index 00000000..d2fd395c
--- /dev/null
+++ b/packages/time/src/date/equals/tests/equals.test.ts
@@ -0,0 +1,317 @@
+import { describe, expect, test } from 'vitest'
+import { equals } from '../equals'
+
+describe('equals', () => {
+  describe('with string inputs', () => {
+    test('should return true for same year', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-12-31T23:59:59.999Z',
+        'year',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false for different years', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2025-03-15T14:42:12.789Z',
+        'year',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should return true for same month', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-31T23:59:59.999Z',
+        'month',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false for different months', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-04-15T14:42:12.789Z',
+        'month',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should return true for same week', () => {
+      const result = equals(
+        '2024-03-11T00:00:00Z',
+        '2024-03-17T23:59:59.999Z',
+        'week',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false for different weeks', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-18T14:42:12.789Z',
+        'week',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should return true for same day', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T23:59:59.999Z',
+        'day',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false for different days', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T14:42:12.789Z',
+        'day',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should return true for same hour', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:59:59.999Z',
+        'hour',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false for different hours', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T15:42:12.789Z',
+        'hour',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should return true for same minute', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:59.999Z',
+        'minute',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false for different minutes', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:43:12.789Z',
+        'minute',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should return true for same second', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.999Z',
+        'second',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false for different seconds', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:13.789Z',
+        'second',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should return true for same millisecond', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        'millisecond',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false for different milliseconds', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.790Z',
+        'millisecond',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle year boundaries', () => {
+      const result = equals(
+        '2024-12-31T23:59:59.999Z',
+        '2025-01-01T00:00:00.000Z',
+        'year',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should handle month boundaries', () => {
+      const result = equals(
+        '2024-03-31T23:59:59.999Z',
+        '2024-04-01T00:00:00.000Z',
+        'month',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should handle leap years', () => {
+      const result = equals(
+        '2024-02-28T00:00:00Z',
+        '2024-02-29T00:00:00Z',
+        'month',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle non-leap years', () => {
+      const result = equals(
+        '2023-02-28T00:00:00Z',
+        '2023-03-01T00:00:00Z',
+        'month',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const date1 = new Date('2024-03-15T14:42:12.789Z')
+      const date2 = new Date('2024-03-15T23:59:59.999Z')
+      const result = equals(date1, date2, 'day', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const date1 = new Date('2024-03-15T14:42:12.789Z').getTime()
+      const date2 = new Date('2024-03-15T23:59:59.999Z').getTime()
+      const result = equals(date1, date2, 'day', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with mixed input types', () => {
+      const date1 = '2024-03-15T14:42:12.789Z'
+      const date2 = new Date('2024-03-15T23:59:59.999Z')
+      const result = equals(date1, date2, 'day', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = equals(
+        '2024-03-15T14:00:00Z',
+        '2024-03-15T19:00:00Z',
+        'day',
+        {
+          timeZone: 'America/New_York',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle different timezones correctly', () => {
+      const result = equals(
+        '2024-03-15T00:00:00Z',
+        '2024-03-16T00:00:00Z',
+        'day',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = equals(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        'day',
+        {
+          calendar: 'japanese',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+})
diff --git a/packages/time/src/date/format/format.ts b/packages/time/src/date/format/format.ts
new file mode 100644
index 00000000..4c15aa59
--- /dev/null
+++ b/packages/time/src/date/format/format.ts
@@ -0,0 +1,91 @@
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions } from '../types'
+import type {
+  DateFormatterBuildParams,
+  DateTimeFormatterBuildParams,
+  TimeFormatterBuildParams,
+} from '~/formatter/shared'
+import { getDateTimeDefaults } from '~/utils'
+import { buildFinalFormatter } from '~/formatter/buildFinalFormatter'
+import { buildDateFormatter } from '~/formatter/buildDateFormatter'
+import { buildTimeFormatter } from '~/formatter/buildTimeFormatter'
+import { buildDateTimeFormatter } from '~/formatter/buildDateTimeFormatter'
+
+export type FormatType = 'date' | 'time' | 'datetime'
+
+export interface FormatDateOptions extends DateOptions {
+  type?: FormatType
+  locale?: string | Intl.Locale | Array<string> | Array<Intl.Locale>
+  options?:
+    | string
+    | DateFormatterBuildParams['options']
+    | TimeFormatterBuildParams['options']
+    | DateTimeFormatterBuildParams['options']
+}
+
+/**
+ * format
+ * Formats a date/time instance using Intl.DateTimeFormat
+ * @param date - The date to format
+ * @param formatOptions - Formatting options including type, locale, and Intl.DateTimeFormat options
+ */
+export function format(
+  date: DateInput,
+  formatOptions?: FormatDateOptions,
+): string {
+  const {
+    locale: defaultLocale,
+    timeZone: defaultTimeZone,
+    calendar: defaultCalendar,
+  } = getDateTimeDefaults()
+  const {
+    type = 'datetime',
+    locale = defaultLocale,
+    timeZone = defaultTimeZone,
+    calendar = defaultCalendar,
+    options,
+  } = formatOptions ?? {}
+
+  const zdt = toZonedDateTime(date, timeZone, calendar)
+  const dateObj = new Date(Number(zdt.epochNanoseconds / 1_000_000n))
+
+  const mergedOptions =
+    typeof options === 'string'
+      ? options
+      : {
+          ...options,
+          timeZone,
+          calendar,
+        }
+
+  let formatter: Intl.DateTimeFormat
+
+  switch (type) {
+    case 'date':
+      formatter = buildDateFormatter({
+        locale,
+        options: mergedOptions as DateFormatterBuildParams['options'],
+      })
+      break
+    case 'time':
+      formatter = buildTimeFormatter({
+        locale,
+        options: mergedOptions as TimeFormatterBuildParams['options'],
+      })
+      break
+    case 'datetime':
+    default:
+      formatter = buildDateTimeFormatter({
+        locale,
+        options: mergedOptions as DateTimeFormatterBuildParams['options'],
+      })
+      break
+  }
+
+  const formatFn = buildFinalFormatter({
+    formatter,
+    formatterName: 'format',
+  })
+
+  return formatFn(dateObj)
+}
diff --git a/packages/time/src/date/format/index.ts b/packages/time/src/date/format/index.ts
new file mode 100644
index 00000000..ba9e8a49
--- /dev/null
+++ b/packages/time/src/date/format/index.ts
@@ -0,0 +1,2 @@
+export { format } from './format'
+export type { FormatDateOptions, FormatType } from './format'
diff --git a/packages/time/src/date/format/tests/format.test.ts b/packages/time/src/date/format/tests/format.test.ts
new file mode 100644
index 00000000..007081eb
--- /dev/null
+++ b/packages/time/src/date/format/tests/format.test.ts
@@ -0,0 +1,275 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { format } from '../format'
+
+describe('format', () => {
+  describe('with default datetime format', () => {
+    test('should format date with string input', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format date with Date input', () => {
+      const date = new Date('2024-03-15T14:42:12.789Z')
+      const result = format(date, {
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format date with epoch time input', () => {
+      const epoch = new Date('2024-03-15T14:42:12.789Z').getTime()
+      const result = format(epoch, {
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format date with ZonedDateTime input', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const result = format(zdt, {
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+  })
+
+  describe('with date type', () => {
+    test('should format date only', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        type: 'date',
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format date with dateStyle option', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        type: 'date',
+        options: 'full',
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format date with object options', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        type: 'date',
+        options: {
+          year: 'numeric',
+          month: 'long',
+          day: 'numeric',
+        },
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+  })
+
+  describe('with time type', () => {
+    test('should format time only', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        type: 'time',
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format time with timeStyle option', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        type: 'time',
+        options: 'full',
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format time with object options', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        type: 'time',
+        options: {
+          hour: '2-digit',
+          minute: '2-digit',
+          second: '2-digit',
+        },
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+  })
+
+  describe('with datetime type', () => {
+    test('should format date and time', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        type: 'datetime',
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format datetime with style option', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        type: 'datetime',
+        options: 'full',
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format datetime with object options', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        type: 'datetime',
+        options: {
+          year: 'numeric',
+          month: 'long',
+          day: 'numeric',
+          hour: '2-digit',
+          minute: '2-digit',
+        },
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+  })
+
+  describe('locale handling', () => {
+    test('should format with different locale', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        locale: 'en-US',
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format with French locale', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        locale: 'fr-FR',
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format with Japanese locale', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        locale: 'ja-JP',
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should format with UTC timezone', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format with America/New_York timezone', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        timeZone: 'America/New_York',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format with Asia/Tokyo timezone', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        timeZone: 'Asia/Tokyo',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should format with default calendar', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format with japanese calendar', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        calendar: 'japanese',
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle year boundary', () => {
+      const result = format('2023-12-31T23:59:59.999Z', {
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should handle leap year date', () => {
+      const result = format('2024-02-29T12:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should handle midnight', () => {
+      const result = format('2024-03-15T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should handle end of day', () => {
+      const result = format('2024-03-15T23:59:59.999Z', {
+        timeZone: 'UTC',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+  })
+
+  describe('with minimal options', () => {
+    test('should format with no options', () => {
+      const result = format('2024-03-15T14:42:12.789Z')
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+
+    test('should format with only type option', () => {
+      const result = format('2024-03-15T14:42:12.789Z', {
+        type: 'date',
+      })
+      expect(typeof result).toBe('string')
+      expect(result.length).toBeGreaterThan(0)
+    })
+  })
+})
diff --git a/packages/time/src/date/fromUnixTime/fromUnixTime.ts b/packages/time/src/date/fromUnixTime/fromUnixTime.ts
new file mode 100644
index 00000000..5dd42269
--- /dev/null
+++ b/packages/time/src/date/fromUnixTime/fromUnixTime.ts
@@ -0,0 +1,22 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { createDateOperationResult } from '../withDateOperation'
+import type { DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface FromUnixTimeOptions extends DateOptions {}
+
+export function fromUnixTime(timestamp: number, options?: FromUnixTimeOptions) {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  const instant = Temporal.Instant.fromEpochMilliseconds(timestamp * 1000)
+  const zdt = instant.toZonedDateTimeISO(timeZone).withCalendar(calendar)
+
+  return createDateOperationResult(zdt, {
+    timeZone,
+    calendar,
+    returnFormat: 'standard',
+  })
+}
diff --git a/packages/time/src/date/fromUnixTime/index.ts b/packages/time/src/date/fromUnixTime/index.ts
new file mode 100644
index 00000000..61068848
--- /dev/null
+++ b/packages/time/src/date/fromUnixTime/index.ts
@@ -0,0 +1 @@
+export * from './fromUnixTime'
diff --git a/packages/time/src/date/fromUnixTime/tests/fromUnixTime.test.ts b/packages/time/src/date/fromUnixTime/tests/fromUnixTime.test.ts
new file mode 100644
index 00000000..84ed1b00
--- /dev/null
+++ b/packages/time/src/date/fromUnixTime/tests/fromUnixTime.test.ts
@@ -0,0 +1,52 @@
+import { describe, expect, test } from 'vitest'
+import { fromUnixTime } from '../fromUnixTime'
+
+describe('fromUnixTime', () => {
+  describe('with unix timestamp', () => {
+    test('should convert unix timestamp to date', () => {
+      const timestamp = 1710513732
+      const result = fromUnixTime(timestamp, { timeZone: 'UTC' })
+      expect(result.value).toBe('2024-03-15T14:42:12Z')
+    })
+
+    test('should convert zero timestamp', () => {
+      const result = fromUnixTime(0, { timeZone: 'UTC' })
+      expect(result.value).toBe('1970-01-01T00:00:00Z')
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const timestamp = 1710513732
+      const result = fromUnixTime(timestamp, {
+        timeZone: 'America/New_York',
+      })
+      expect(result.timeZone).toBe('America/New_York')
+      expect(result.value).toContain('2024-03-15')
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const timestamp = 1710513732
+      const result = fromUnixTime(timestamp, { calendar: 'japanese' })
+      expect(result.calendar).toBe('japanese')
+    })
+  })
+
+  describe('output methods', () => {
+    test('asDate should return Date object', () => {
+      const timestamp = 1710513732
+      const result = fromUnixTime(timestamp, { timeZone: 'UTC' })
+      const date = result.asDate()
+      expect(date).toBeInstanceOf(Date)
+      expect(date.toISOString()).toBe('2024-03-15T14:42:12.000Z')
+    })
+
+    test('asEpoch should return epoch timestamp', () => {
+      const timestamp = 1710513732
+      const result = fromUnixTime(timestamp, { timeZone: 'UTC' })
+      expect(result.asEpoch()).toBe(1710513732000)
+    })
+  })
+})
diff --git a/packages/time/src/date/getDayOfYear/getDayOfYear.ts b/packages/time/src/date/getDayOfYear/getDayOfYear.ts
new file mode 100644
index 00000000..d630d2b7
--- /dev/null
+++ b/packages/time/src/date/getDayOfYear/getDayOfYear.ts
@@ -0,0 +1,18 @@
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface GetDayOfYearOptions extends DateOptions {}
+
+export function getDayOfYear(
+  date: DateInput,
+  options?: GetDayOfYearOptions,
+): number {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  const zdt = toZonedDateTime(date, timeZone, calendar)
+  return zdt.dayOfYear
+}
diff --git a/packages/time/src/date/getDayOfYear/index.ts b/packages/time/src/date/getDayOfYear/index.ts
new file mode 100644
index 00000000..a440dcfe
--- /dev/null
+++ b/packages/time/src/date/getDayOfYear/index.ts
@@ -0,0 +1 @@
+export * from './getDayOfYear'
diff --git a/packages/time/src/date/getDayOfYear/tests/getDayOfYear.test.ts b/packages/time/src/date/getDayOfYear/tests/getDayOfYear.test.ts
new file mode 100644
index 00000000..a8d145d0
--- /dev/null
+++ b/packages/time/src/date/getDayOfYear/tests/getDayOfYear.test.ts
@@ -0,0 +1,69 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { getDayOfYear } from '../getDayOfYear'
+
+describe('getDayOfYear', () => {
+  describe('with string input', () => {
+    test('should return day of year for January 1st', () => {
+      const result = getDayOfYear('2024-01-01T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(1)
+    })
+
+    test('should return day of year for March 15th', () => {
+      const result = getDayOfYear('2024-03-15T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(75)
+    })
+
+    test('should return day of year for December 31st in leap year', () => {
+      const result = getDayOfYear('2024-12-31T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(366)
+    })
+
+    test('should return day of year for December 31st in non-leap year', () => {
+      const result = getDayOfYear('2023-12-31T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(365)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date object', () => {
+      const result = getDayOfYear(new Date('2024-03-15T00:00:00Z'), {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(75)
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2024-03-15T00:00:00Z').getTime()
+      const result = getDayOfYear(epoch, { timeZone: 'UTC' })
+      expect(result).toBe(75)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T00:00:00Z[UTC][u-ca=gregory]',
+      )
+      const result = getDayOfYear(zdt, { timeZone: 'UTC' })
+      expect(result).toBe(75)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = getDayOfYear('2024-03-15T00:00:00Z', {
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(74)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = getDayOfYear('2024-03-15T00:00:00Z', {
+        timeZone: 'UTC',
+        calendar: 'japanese',
+      })
+      expect(result).toBe(75)
+    })
+  })
+})
diff --git a/packages/time/src/date/getUnixTime/getUnixTime.ts b/packages/time/src/date/getUnixTime/getUnixTime.ts
new file mode 100644
index 00000000..e6edb5b6
--- /dev/null
+++ b/packages/time/src/date/getUnixTime/getUnixTime.ts
@@ -0,0 +1,18 @@
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface GetUnixTimeOptions extends DateOptions {}
+
+export function getUnixTime(
+  date: DateInput,
+  options?: GetUnixTimeOptions,
+): number {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  const zdt = toZonedDateTime(date, timeZone, calendar)
+  return Number(zdt.epochNanoseconds / 1_000_000_000n)
+}
diff --git a/packages/time/src/date/getUnixTime/index.ts b/packages/time/src/date/getUnixTime/index.ts
new file mode 100644
index 00000000..0c70625c
--- /dev/null
+++ b/packages/time/src/date/getUnixTime/index.ts
@@ -0,0 +1 @@
+export * from './getUnixTime'
diff --git a/packages/time/src/date/getUnixTime/tests/getUnixTime.test.ts b/packages/time/src/date/getUnixTime/tests/getUnixTime.test.ts
new file mode 100644
index 00000000..206a604f
--- /dev/null
+++ b/packages/time/src/date/getUnixTime/tests/getUnixTime.test.ts
@@ -0,0 +1,59 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { getUnixTime } from '../getUnixTime'
+
+describe('getUnixTime', () => {
+  describe('with string input', () => {
+    test('should return unix timestamp for date', () => {
+      const result = getUnixTime('2024-03-15T14:42:12Z', { timeZone: 'UTC' })
+      expect(result).toBe(1710513732)
+    })
+
+    test('should return zero for epoch', () => {
+      const result = getUnixTime('1970-01-01T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(0)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date object', () => {
+      const result = getUnixTime(new Date('2024-03-15T14:42:12Z'), {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(1710513732)
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2024-03-15T14:42:12Z').getTime()
+      const result = getUnixTime(epoch, { timeZone: 'UTC' })
+      expect(result).toBe(1710513732)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:42:12Z[UTC][u-ca=gregory]',
+      )
+      const result = getUnixTime(zdt, { timeZone: 'UTC' })
+      expect(result).toBe(1710513732)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = getUnixTime('2024-03-15T14:42:12Z', {
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(1710513732)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = getUnixTime('2024-03-15T14:42:12Z', {
+        timeZone: 'UTC',
+        calendar: 'japanese',
+      })
+      expect(result).toBe(1710513732)
+    })
+  })
+})
diff --git a/packages/time/src/date/getWeek/getWeek.ts b/packages/time/src/date/getWeek/getWeek.ts
new file mode 100644
index 00000000..af02b675
--- /dev/null
+++ b/packages/time/src/date/getWeek/getWeek.ts
@@ -0,0 +1,15 @@
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface GetWeekOptions extends DateOptions {}
+
+export function getWeek(date: DateInput, options?: GetWeekOptions): number {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  const zdt = toZonedDateTime(date, timeZone, calendar)
+  return zdt.weekOfYear ?? 0
+}
diff --git a/packages/time/src/date/getWeek/index.ts b/packages/time/src/date/getWeek/index.ts
new file mode 100644
index 00000000..dd153c24
--- /dev/null
+++ b/packages/time/src/date/getWeek/index.ts
@@ -0,0 +1 @@
+export * from './getWeek'
diff --git a/packages/time/src/date/getWeek/tests/getWeek.test.ts b/packages/time/src/date/getWeek/tests/getWeek.test.ts
new file mode 100644
index 00000000..07403377
--- /dev/null
+++ b/packages/time/src/date/getWeek/tests/getWeek.test.ts
@@ -0,0 +1,64 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { getWeek } from '../getWeek'
+
+describe('getWeek', () => {
+  describe('with string input', () => {
+    test('should return week for January 1st', () => {
+      const result = getWeek('2024-01-01T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(1)
+    })
+
+    test('should return week for March 15th', () => {
+      const result = getWeek('2024-03-15T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(11)
+    })
+
+    test('should return week for December 31st', () => {
+      const result = getWeek('2024-12-31T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(1)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date object', () => {
+      const result = getWeek(new Date('2024-03-15T00:00:00Z'), {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(11)
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2024-03-15T00:00:00Z').getTime()
+      const result = getWeek(epoch, { timeZone: 'UTC' })
+      expect(result).toBe(11)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T00:00:00Z[UTC][u-ca=gregory]',
+      )
+      const result = getWeek(zdt, { timeZone: 'UTC' })
+      expect(result).toBe(11)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = getWeek('2024-03-15T00:00:00Z', {
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(11)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = getWeek('2024-03-15T00:00:00Z', {
+        timeZone: 'UTC',
+        calendar: 'gregory',
+      })
+      expect(result).toBe(11)
+    })
+  })
+})
diff --git a/packages/time/src/date/helpers/index.ts b/packages/time/src/date/helpers/index.ts
new file mode 100644
index 00000000..9c9cec67
--- /dev/null
+++ b/packages/time/src/date/helpers/index.ts
@@ -0,0 +1,3 @@
+export * from './toZonedDateTime'
+export * from './normalizeWeek'
+export * from './normalizeLocale'
diff --git a/packages/time/src/date/helpers/normalizeLocale.ts b/packages/time/src/date/helpers/normalizeLocale.ts
new file mode 100644
index 00000000..859be9e8
--- /dev/null
+++ b/packages/time/src/date/helpers/normalizeLocale.ts
@@ -0,0 +1,9 @@
+import type { Locale } from '~/formatter/shared'
+
+export function normalizeLocale(locale: Locale): string | Array<string> {
+  return Array.isArray(locale)
+    ? locale.map((loc) => (typeof loc === 'string' ? loc : loc.toString()))
+    : typeof locale === 'string'
+      ? locale
+      : locale.toString()
+}
diff --git a/packages/time/src/date/helpers/normalizeWeek.ts b/packages/time/src/date/helpers/normalizeWeek.ts
new file mode 100644
index 00000000..b0c1695f
--- /dev/null
+++ b/packages/time/src/date/helpers/normalizeWeek.ts
@@ -0,0 +1,18 @@
+import type { Temporal } from '@js-temporal/polyfill'
+
+/**
+ * Normalizes a ZonedDateTime to midnight for week-level comparisons
+ * This is needed because startOf('week') only adjusts the day but preserves time components
+ */
+export function normalizeWeek(
+  zdt: Temporal.ZonedDateTime,
+): Temporal.ZonedDateTime {
+  return zdt.with({
+    hour: 0,
+    minute: 0,
+    second: 0,
+    millisecond: 0,
+    microsecond: 0,
+    nanosecond: 0,
+  })
+}
diff --git a/packages/time/src/date/helpers/toZonedDateTime.ts b/packages/time/src/date/helpers/toZonedDateTime.ts
new file mode 100644
index 00000000..9edc0ddd
--- /dev/null
+++ b/packages/time/src/date/helpers/toZonedDateTime.ts
@@ -0,0 +1,34 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { validateDate } from '../validateDate'
+import type { DateInput } from '../types'
+
+export function toZonedDateTime(
+  input: DateInput,
+  timeZone: string,
+  calendar: string,
+): Temporal.ZonedDateTime {
+  if (input instanceof Temporal.ZonedDateTime) {
+    return input
+  }
+
+  let dateString: string
+
+  if (typeof input === 'string') {
+    if (input.includes('[') && input.includes(']')) {
+      return Temporal.ZonedDateTime.from(input)
+    }
+    const date = validateDate({ date: input })
+    dateString = date.toISOString()
+  } else if (typeof input === 'number') {
+    const date = validateDate({ date: input })
+    dateString = date.toISOString()
+  } else if (input instanceof Date) {
+    const date = validateDate({ date: input })
+    dateString = date.toISOString()
+  } else {
+    throw new Error(`Invalid date input type: ${typeof input}`)
+  }
+
+  const zonedDateTimeString = `${dateString}[${timeZone}][u-ca=${calendar}]`
+  return Temporal.ZonedDateTime.from(zonedDateTimeString)
+}
diff --git a/packages/time/src/date/index.ts b/packages/time/src/date/index.ts
new file mode 100644
index 00000000..4db658a1
--- /dev/null
+++ b/packages/time/src/date/index.ts
@@ -0,0 +1,37 @@
+export type * from './types'
+export {
+  toDate,
+  toPlainDateString,
+  toPlainDateTimeString,
+  toPlainTimeString,
+} from './parse'
+export * from './add'
+export * from './subtract'
+export * from './since'
+export * from './until'
+export * from './startOf'
+export * from './endOf'
+export * from './round'
+export * from './isBefore'
+export * from './isAfter'
+export * from './equals'
+export * from './isSameOrBefore'
+export * from './isSameOrAfter'
+export * from './isBetween'
+export * from './intersects'
+export * from './format'
+export * from './isLeapYear'
+export * from './isWeekend'
+export * from './range'
+export * from './ceil'
+export * from './clamp'
+export * from './set'
+export * from './count'
+export * from './min'
+export * from './max'
+export * from './isPast'
+export * from './isFuture'
+export * from './fromUnixTime'
+export * from './getUnixTime'
+export * from './getDayOfYear'
+export * from './getWeek'
diff --git a/packages/time/src/date/intersects/index.ts b/packages/time/src/date/intersects/index.ts
new file mode 100644
index 00000000..7a96d852
--- /dev/null
+++ b/packages/time/src/date/intersects/index.ts
@@ -0,0 +1,2 @@
+export { intersects } from './intersects'
+export type { IntersectsOptions } from './intersects'
diff --git a/packages/time/src/date/intersects/intersects.ts b/packages/time/src/date/intersects/intersects.ts
new file mode 100644
index 00000000..40d36b66
--- /dev/null
+++ b/packages/time/src/date/intersects/intersects.ts
@@ -0,0 +1,36 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions, Range } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface IntersectsOptions extends DateOptions {
+  range: Range
+}
+
+/**
+ * intersects
+ * Returns true if the date/time instance intersects with the range (i.e., is within or equal to the range boundaries)
+ * @param date - The date to check
+ * @param options - Options including range, timeZone and calendar
+ */
+export function intersects(
+  date: DateInput,
+  options: IntersectsOptions,
+): boolean {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const {
+    range: { start, end },
+    timeZone = defaultTimeZone,
+    calendar = defaultCalendar,
+  } = options
+
+  const zdt = toZonedDateTime(date, timeZone, calendar)
+  const zdtStart = toZonedDateTime(start, timeZone, calendar)
+  const zdtEnd = toZonedDateTime(end, timeZone, calendar)
+
+  const compareStart = Temporal.ZonedDateTime.compare(zdt, zdtStart)
+  const compareEnd = Temporal.ZonedDateTime.compare(zdt, zdtEnd)
+
+  return compareStart >= 0 && compareEnd <= 0
+}
diff --git a/packages/time/src/date/intersects/tests/intersects.test.ts b/packages/time/src/date/intersects/tests/intersects.test.ts
new file mode 100644
index 00000000..f9bdabcc
--- /dev/null
+++ b/packages/time/src/date/intersects/tests/intersects.test.ts
@@ -0,0 +1,178 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { intersects } from '../intersects'
+
+describe('intersects', () => {
+  describe('basic functionality', () => {
+    test('should return true when date is between start and end', () => {
+      const result = intersects('2024-03-16T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true when date equals start', () => {
+      const result = intersects('2024-03-15T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true when date equals end', () => {
+      const result = intersects('2024-03-17T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return false when date is before start', () => {
+      const result = intersects('2024-03-14T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should return false when date is after end', () => {
+      const result = intersects('2024-03-18T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const date = new Date('2024-03-16T14:42:12.789Z')
+      const result = intersects(date, {
+        range: {
+          start: new Date('2024-03-15T14:42:12.789Z'),
+          end: new Date('2024-03-17T14:42:12.789Z'),
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const date = new Date('2024-03-16T14:42:12.789Z').getTime()
+      const result = intersects(date, {
+        range: {
+          start: new Date('2024-03-15T14:42:12.789Z').getTime(),
+          end: new Date('2024-03-17T14:42:12.789Z').getTime(),
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-16T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const result = intersects(zdt, {
+        range: {
+          start: Temporal.ZonedDateTime.from(
+            '2024-03-15T14:42:12.789Z[UTC][u-ca=gregory]',
+          ),
+          end: Temporal.ZonedDateTime.from(
+            '2024-03-17T14:42:12.789Z[UTC][u-ca=gregory]',
+          ),
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with mixed input types', () => {
+      const result = intersects('2024-03-16T14:42:12.789Z', {
+        range: {
+          start: new Date('2024-03-15T14:42:12.789Z'),
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = intersects('2024-03-16T14:00:00Z', {
+        range: {
+          start: '2024-03-15T14:00:00Z',
+          end: '2024-03-17T14:00:00Z',
+        },
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = intersects('2024-03-16T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        calendar: 'japanese',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle milliseconds precision', () => {
+      const result = intersects('2024-03-15T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.788Z',
+          end: '2024-03-15T14:42:12.790Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle same start and end date', () => {
+      const result = intersects('2024-03-15T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-15T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle reversed range (start after end)', () => {
+      const result = intersects('2024-03-16T14:42:12.789Z', {
+        range: {
+          start: '2024-03-17T14:42:12.789Z',
+          end: '2024-03-15T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+  })
+})
diff --git a/packages/time/src/date/isAfter/index.ts b/packages/time/src/date/isAfter/index.ts
new file mode 100644
index 00000000..48eabef4
--- /dev/null
+++ b/packages/time/src/date/isAfter/index.ts
@@ -0,0 +1,2 @@
+export { isAfter } from './isAfter'
+export type { IsAfterOptions } from './isAfter'
diff --git a/packages/time/src/date/isAfter/isAfter.ts b/packages/time/src/date/isAfter/isAfter.ts
new file mode 100644
index 00000000..2e9ddef7
--- /dev/null
+++ b/packages/time/src/date/isAfter/isAfter.ts
@@ -0,0 +1,26 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface IsAfterOptions extends DateOptions {}
+
+/**
+ * isAfter
+ * Returns true if the first date/time instance is after the second date/time instance
+ */
+export function isAfter(
+  date1: DateInput,
+  date2: DateInput,
+  options?: IsAfterOptions,
+): boolean {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  const zdt1 = toZonedDateTime(date1, timeZone, calendar)
+  const zdt2 = toZonedDateTime(date2, timeZone, calendar)
+
+  return Temporal.ZonedDateTime.compare(zdt1, zdt2) > 0
+}
diff --git a/packages/time/src/date/isAfter/tests/isAfter.test.ts b/packages/time/src/date/isAfter/tests/isAfter.test.ts
new file mode 100644
index 00000000..8f151634
--- /dev/null
+++ b/packages/time/src/date/isAfter/tests/isAfter.test.ts
@@ -0,0 +1,178 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { isAfter } from '../isAfter'
+
+describe('isAfter', () => {
+  describe('with string inputs', () => {
+    test('should return true when first date is after second date', () => {
+      const result = isAfter(
+        '2024-03-16T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false when first date is before second date', () => {
+      const result = isAfter(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should return false when dates are equal', () => {
+      const result = isAfter(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should handle different times on same day', () => {
+      const result = isAfter('2024-03-15T15:00:00Z', '2024-03-15T10:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle different days', () => {
+      const result = isAfter(
+        '2024-03-16T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle different months', () => {
+      const result = isAfter(
+        '2024-03-15T14:42:12.789Z',
+        '2024-02-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle different years', () => {
+      const result = isAfter(
+        '2024-03-15T14:42:12.789Z',
+        '2023-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const date1 = new Date('2024-03-16T14:42:12.789Z')
+      const date2 = new Date('2024-03-15T14:42:12.789Z')
+      const result = isAfter(date1, date2, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const date1 = new Date('2024-03-16T14:42:12.789Z').getTime()
+      const date2 = new Date('2024-03-15T14:42:12.789Z').getTime()
+      const result = isAfter(date1, date2, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt1 = Temporal.ZonedDateTime.from(
+        '2024-03-16T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const zdt2 = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const result = isAfter(zdt1, zdt2, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with mixed input types', () => {
+      const date1 = '2024-03-16T14:42:12.789Z'
+      const date2 = new Date('2024-03-15T14:42:12.789Z')
+      const result = isAfter(date1, date2, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = isAfter('2024-03-15T19:00:00Z', '2024-03-15T14:00:00Z', {
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle different timezones correctly', () => {
+      const result = isAfter('2024-03-16T00:00:00Z', '2024-03-15T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = isAfter(
+        '2024-03-16T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          calendar: 'japanese',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle milliseconds precision', () => {
+      const result = isAfter(
+        '2024-03-15T14:42:12.790Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle leap year dates', () => {
+      const result = isAfter('2024-02-29T00:00:00Z', '2024-02-28T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle year boundaries', () => {
+      const result = isAfter('2024-01-01T00:00:00Z', '2023-12-31T23:59:59Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+})
diff --git a/packages/time/src/date/isBefore/index.ts b/packages/time/src/date/isBefore/index.ts
new file mode 100644
index 00000000..9d1e7079
--- /dev/null
+++ b/packages/time/src/date/isBefore/index.ts
@@ -0,0 +1,2 @@
+export { isBefore } from './isBefore'
+export type { IsBeforeOptions } from './isBefore'
diff --git a/packages/time/src/date/isBefore/isBefore.ts b/packages/time/src/date/isBefore/isBefore.ts
new file mode 100644
index 00000000..1d604f5c
--- /dev/null
+++ b/packages/time/src/date/isBefore/isBefore.ts
@@ -0,0 +1,26 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface IsBeforeOptions extends DateOptions {}
+
+/**
+ * isBefore
+ * Returns true if the first date/time instance is before the second date/time instance
+ */
+export function isBefore(
+  date1: DateInput,
+  date2: DateInput,
+  options?: IsBeforeOptions,
+): boolean {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  const zdt1 = toZonedDateTime(date1, timeZone, calendar)
+  const zdt2 = toZonedDateTime(date2, timeZone, calendar)
+
+  return Temporal.ZonedDateTime.compare(zdt1, zdt2) < 0
+}
diff --git a/packages/time/src/date/isBefore/tests/isBefore.test.ts b/packages/time/src/date/isBefore/tests/isBefore.test.ts
new file mode 100644
index 00000000..1b3a9302
--- /dev/null
+++ b/packages/time/src/date/isBefore/tests/isBefore.test.ts
@@ -0,0 +1,178 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { isBefore } from '../isBefore'
+
+describe('isBefore', () => {
+  describe('with string inputs', () => {
+    test('should return true when first date is before second date', () => {
+      const result = isBefore(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false when first date is after second date', () => {
+      const result = isBefore(
+        '2024-03-16T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should return false when dates are equal', () => {
+      const result = isBefore(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should handle different times on same day', () => {
+      const result = isBefore('2024-03-15T10:00:00Z', '2024-03-15T15:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle different days', () => {
+      const result = isBefore(
+        '2024-03-14T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle different months', () => {
+      const result = isBefore(
+        '2024-02-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle different years', () => {
+      const result = isBefore(
+        '2023-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const date1 = new Date('2024-03-15T14:42:12.789Z')
+      const date2 = new Date('2024-03-16T14:42:12.789Z')
+      const result = isBefore(date1, date2, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const date1 = new Date('2024-03-15T14:42:12.789Z').getTime()
+      const date2 = new Date('2024-03-16T14:42:12.789Z').getTime()
+      const result = isBefore(date1, date2, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt1 = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const zdt2 = Temporal.ZonedDateTime.from(
+        '2024-03-16T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const result = isBefore(zdt1, zdt2, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with mixed input types', () => {
+      const date1 = '2024-03-15T14:42:12.789Z'
+      const date2 = new Date('2024-03-16T14:42:12.789Z')
+      const result = isBefore(date1, date2, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = isBefore('2024-03-15T14:00:00Z', '2024-03-15T19:00:00Z', {
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle different timezones correctly', () => {
+      const result = isBefore('2024-03-15T00:00:00Z', '2024-03-16T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = isBefore(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T14:42:12.789Z',
+        {
+          calendar: 'japanese',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle milliseconds precision', () => {
+      const result = isBefore(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.790Z',
+        {
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle leap year dates', () => {
+      const result = isBefore('2024-02-28T00:00:00Z', '2024-02-29T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle year boundaries', () => {
+      const result = isBefore('2023-12-31T23:59:59Z', '2024-01-01T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+})
diff --git a/packages/time/src/date/isBetween/index.ts b/packages/time/src/date/isBetween/index.ts
new file mode 100644
index 00000000..76c75e46
--- /dev/null
+++ b/packages/time/src/date/isBetween/index.ts
@@ -0,0 +1,2 @@
+export { isBetween } from './isBetween'
+export type { IsBetweenOptions } from './isBetween'
diff --git a/packages/time/src/date/isBetween/isBetween.ts b/packages/time/src/date/isBetween/isBetween.ts
new file mode 100644
index 00000000..7641761d
--- /dev/null
+++ b/packages/time/src/date/isBetween/isBetween.ts
@@ -0,0 +1,43 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions, Range } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface IsBetweenOptions extends DateOptions {
+  inclusive?: boolean | 'start' | 'end'
+  range: Range
+}
+
+/**
+ * isBetween
+ * Returns true if the date/time instance is between the start and end of the range
+ * @param date - The date to check
+ * @param range - The range with start and end dates
+ * @param options - Options including timeZone, calendar, and inclusivity
+ */
+export function isBetween(date: DateInput, options: IsBetweenOptions): boolean {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const {
+    range: { start, end },
+    timeZone = defaultTimeZone,
+    calendar = defaultCalendar,
+    inclusive = true,
+  } = options
+  const zdt = toZonedDateTime(date, timeZone, calendar)
+  const zdtStart = toZonedDateTime(start, timeZone, calendar)
+  const zdtEnd = toZonedDateTime(end, timeZone, calendar)
+
+  const compareStart = Temporal.ZonedDateTime.compare(zdt, zdtStart)
+  const compareEnd = Temporal.ZonedDateTime.compare(zdt, zdtEnd)
+
+  if (inclusive === true) {
+    return compareStart >= 0 && compareEnd <= 0
+  } else if (inclusive === 'start') {
+    return compareStart >= 0 && compareEnd < 0
+  } else if (inclusive === 'end') {
+    return compareStart > 0 && compareEnd <= 0
+  } else {
+    return compareStart > 0 && compareEnd < 0
+  }
+}
diff --git a/packages/time/src/date/isBetween/tests/isBetween.test.ts b/packages/time/src/date/isBetween/tests/isBetween.test.ts
new file mode 100644
index 00000000..8f48a5bc
--- /dev/null
+++ b/packages/time/src/date/isBetween/tests/isBetween.test.ts
@@ -0,0 +1,268 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { isBetween } from '../isBetween'
+
+describe('isBetween', () => {
+  describe('with inclusive range (default)', () => {
+    test('should return true when date is between start and end', () => {
+      const result = isBetween('2024-03-16T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true when date equals start', () => {
+      const result = isBetween('2024-03-15T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true when date equals end', () => {
+      const result = isBetween('2024-03-17T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return false when date is before start', () => {
+      const result = isBetween('2024-03-14T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should return false when date is after end', () => {
+      const result = isBetween('2024-03-18T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('with exclusive range', () => {
+    test('should return true when date is strictly between start and end', () => {
+      const result = isBetween('2024-03-16T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+        inclusive: false,
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return false when date equals start', () => {
+      const result = isBetween('2024-03-15T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+        inclusive: false,
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should return false when date equals end', () => {
+      const result = isBetween('2024-03-17T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+        inclusive: false,
+      })
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('with inclusive start only', () => {
+    test('should return true when date equals start', () => {
+      const result = isBetween('2024-03-15T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+        inclusive: 'start',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return false when date equals end', () => {
+      const result = isBetween('2024-03-17T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+        inclusive: 'start',
+      })
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('with inclusive end only', () => {
+    test('should return true when date equals end', () => {
+      const result = isBetween('2024-03-17T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+        inclusive: 'end',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return false when date equals start', () => {
+      const result = isBetween('2024-03-15T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+        inclusive: 'end',
+      })
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const date = new Date('2024-03-16T14:42:12.789Z')
+      const result = isBetween(date, {
+        range: {
+          start: new Date('2024-03-15T14:42:12.789Z'),
+          end: new Date('2024-03-17T14:42:12.789Z'),
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const date = new Date('2024-03-16T14:42:12.789Z').getTime()
+      const result = isBetween(date, {
+        range: {
+          start: new Date('2024-03-15T14:42:12.789Z').getTime(),
+          end: new Date('2024-03-17T14:42:12.789Z').getTime(),
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-16T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const result = isBetween(zdt, {
+        range: {
+          start: Temporal.ZonedDateTime.from(
+            '2024-03-15T14:42:12.789Z[UTC][u-ca=gregory]',
+          ),
+          end: Temporal.ZonedDateTime.from(
+            '2024-03-17T14:42:12.789Z[UTC][u-ca=gregory]',
+          ),
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with mixed input types', () => {
+      const result = isBetween('2024-03-16T14:42:12.789Z', {
+        range: {
+          start: new Date('2024-03-15T14:42:12.789Z'),
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = isBetween('2024-03-16T14:00:00Z', {
+        range: {
+          start: '2024-03-15T14:00:00Z',
+          end: '2024-03-17T14:00:00Z',
+        },
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = isBetween('2024-03-16T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-17T14:42:12.789Z',
+        },
+        calendar: 'japanese',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle milliseconds precision', () => {
+      const result = isBetween('2024-03-15T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.788Z',
+          end: '2024-03-15T14:42:12.790Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle same start and end date', () => {
+      const result = isBetween('2024-03-15T14:42:12.789Z', {
+        range: {
+          start: '2024-03-15T14:42:12.789Z',
+          end: '2024-03-15T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle reversed range (start after end)', () => {
+      const result = isBetween('2024-03-16T14:42:12.789Z', {
+        range: {
+          start: '2024-03-17T14:42:12.789Z',
+          end: '2024-03-15T14:42:12.789Z',
+        },
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+  })
+})
diff --git a/packages/time/src/date/isFuture/index.ts b/packages/time/src/date/isFuture/index.ts
new file mode 100644
index 00000000..af5644e7
--- /dev/null
+++ b/packages/time/src/date/isFuture/index.ts
@@ -0,0 +1 @@
+export * from './isFuture'
diff --git a/packages/time/src/date/isFuture/isFuture.ts b/packages/time/src/date/isFuture/isFuture.ts
new file mode 100644
index 00000000..9b07e99b
--- /dev/null
+++ b/packages/time/src/date/isFuture/isFuture.ts
@@ -0,0 +1,18 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface IsFutureOptions extends DateOptions {}
+
+export function isFuture(date: DateInput, options?: IsFutureOptions): boolean {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  const zdt = toZonedDateTime(date, timeZone, calendar)
+  const now = Temporal.Now.zonedDateTimeISO(timeZone).withCalendar(calendar)
+
+  return Temporal.ZonedDateTime.compare(zdt, now) > 0
+}
diff --git a/packages/time/src/date/isFuture/tests/isFuture.test.ts b/packages/time/src/date/isFuture/tests/isFuture.test.ts
new file mode 100644
index 00000000..b14df57f
--- /dev/null
+++ b/packages/time/src/date/isFuture/tests/isFuture.test.ts
@@ -0,0 +1,59 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { isFuture } from '../isFuture'
+
+describe('isFuture', () => {
+  describe('with string input', () => {
+    test('should return true for future date', () => {
+      const result = isFuture('2030-01-01T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(true)
+    })
+
+    test('should return false for past date', () => {
+      const result = isFuture('2020-01-01T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date object', () => {
+      const result = isFuture(new Date('2030-01-01T00:00:00Z'), {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2030-01-01T00:00:00Z').getTime()
+      const result = isFuture(epoch, { timeZone: 'UTC' })
+      expect(result).toBe(true)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2030-01-01T00:00:00Z[UTC][u-ca=gregory]',
+      )
+      const result = isFuture(zdt, { timeZone: 'UTC' })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = isFuture('2030-01-01T00:00:00Z', {
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = isFuture('2030-01-01T00:00:00Z', {
+        timeZone: 'UTC',
+        calendar: 'japanese',
+      })
+      expect(result).toBe(true)
+    })
+  })
+})
diff --git a/packages/time/src/date/isLeapYear/index.ts b/packages/time/src/date/isLeapYear/index.ts
new file mode 100644
index 00000000..bda4faf1
--- /dev/null
+++ b/packages/time/src/date/isLeapYear/index.ts
@@ -0,0 +1 @@
+export * from './isLeapYear'
diff --git a/packages/time/src/date/isLeapYear/isLeapYear.ts b/packages/time/src/date/isLeapYear/isLeapYear.ts
new file mode 100644
index 00000000..febd81c0
--- /dev/null
+++ b/packages/time/src/date/isLeapYear/isLeapYear.ts
@@ -0,0 +1,21 @@
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface IsLeapYearOptions extends DateOptions {}
+
+/**
+ * isLeapYear
+ * Returns true if the year of the given date is a leap year
+ */
+export function isLeapYear(
+  date: DateInput,
+  options?: IsLeapYearOptions,
+): boolean {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  return toZonedDateTime(date, timeZone, calendar).inLeapYear
+}
diff --git a/packages/time/src/date/isLeapYear/tests/isLeapYear.test.ts b/packages/time/src/date/isLeapYear/tests/isLeapYear.test.ts
new file mode 100644
index 00000000..7f2d1323
--- /dev/null
+++ b/packages/time/src/date/isLeapYear/tests/isLeapYear.test.ts
@@ -0,0 +1,169 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { isLeapYear } from '../isLeapYear'
+
+describe('isLeapYear', () => {
+  describe('leap years', () => {
+    test('should return true for 2024 (divisible by 4)', () => {
+      const result = isLeapYear('2024-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true for 2000 (divisible by 400)', () => {
+      const result = isLeapYear('2000-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true for 2020 (divisible by 4)', () => {
+      const result = isLeapYear('2020-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true for 2016 (divisible by 4)', () => {
+      const result = isLeapYear('2016-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true when date is February 29 of leap year', () => {
+      const result = isLeapYear('2024-02-29T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('non-leap years', () => {
+    test('should return false for 2023 (not divisible by 4)', () => {
+      const result = isLeapYear('2023-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should return false for 2025 (not divisible by 4)', () => {
+      const result = isLeapYear('2025-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should return false for 1900 (divisible by 100 but not 400)', () => {
+      const result = isLeapYear('1900-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should return false for 2100 (divisible by 100 but not 400)', () => {
+      const result = isLeapYear('2100-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date object', () => {
+      const date = new Date('2024-03-15T14:42:12.789Z')
+      const result = isLeapYear(date, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2024-03-15T14:42:12.789Z').getTime()
+      const result = isLeapYear(epoch, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const result = isLeapYear(zdt, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with date string', () => {
+      const result = isLeapYear('2024-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timeZone option', () => {
+      const result = isLeapYear('2024-03-15T14:42:12.789Z', {
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should use default timeZone when not provided', () => {
+      const result = isLeapYear('2024-03-15T14:42:12.789Z')
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar option', () => {
+      const result = isLeapYear('2024-03-15T14:42:12.789Z', {
+        calendar: 'japanese',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should use default calendar when not provided', () => {
+      const result = isLeapYear('2024-03-15T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle year boundaries correctly', () => {
+      const result = isLeapYear('2024-12-31T23:59:59Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle January 1st correctly', () => {
+      const result = isLeapYear('2024-01-01T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle different months correctly', () => {
+      const result1 = isLeapYear('2024-01-15T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      const result2 = isLeapYear('2024-06-15T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      const result3 = isLeapYear('2024-12-15T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result1).toBe(true)
+      expect(result2).toBe(true)
+      expect(result3).toBe(true)
+    })
+  })
+})
diff --git a/packages/time/src/date/isPast/index.ts b/packages/time/src/date/isPast/index.ts
new file mode 100644
index 00000000..583c866e
--- /dev/null
+++ b/packages/time/src/date/isPast/index.ts
@@ -0,0 +1 @@
+export * from './isPast'
diff --git a/packages/time/src/date/isPast/isPast.ts b/packages/time/src/date/isPast/isPast.ts
new file mode 100644
index 00000000..59cbae9a
--- /dev/null
+++ b/packages/time/src/date/isPast/isPast.ts
@@ -0,0 +1,18 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { toZonedDateTime } from '../helpers'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface IsPastOptions extends DateOptions {}
+
+export function isPast(date: DateInput, options?: IsPastOptions): boolean {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  const zdt = toZonedDateTime(date, timeZone, calendar)
+  const now = Temporal.Now.zonedDateTimeISO(timeZone).withCalendar(calendar)
+
+  return Temporal.ZonedDateTime.compare(zdt, now) < 0
+}
diff --git a/packages/time/src/date/isPast/tests/isPast.test.ts b/packages/time/src/date/isPast/tests/isPast.test.ts
new file mode 100644
index 00000000..df4df486
--- /dev/null
+++ b/packages/time/src/date/isPast/tests/isPast.test.ts
@@ -0,0 +1,59 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { isPast } from '../isPast'
+
+describe('isPast', () => {
+  describe('with string input', () => {
+    test('should return true for past date', () => {
+      const result = isPast('2020-01-01T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(true)
+    })
+
+    test('should return false for future date', () => {
+      const result = isPast('2030-01-01T00:00:00Z', { timeZone: 'UTC' })
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date object', () => {
+      const result = isPast(new Date('2020-01-01T00:00:00Z'), {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2020-01-01T00:00:00Z').getTime()
+      const result = isPast(epoch, { timeZone: 'UTC' })
+      expect(result).toBe(true)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2020-01-01T00:00:00Z[UTC][u-ca=gregory]',
+      )
+      const result = isPast(zdt, { timeZone: 'UTC' })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = isPast('2020-01-01T00:00:00Z', {
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = isPast('2020-01-01T00:00:00Z', {
+        timeZone: 'UTC',
+        calendar: 'japanese',
+      })
+      expect(result).toBe(true)
+    })
+  })
+})
diff --git a/packages/time/src/date/isSameOrAfter/index.ts b/packages/time/src/date/isSameOrAfter/index.ts
new file mode 100644
index 00000000..82fb41dd
--- /dev/null
+++ b/packages/time/src/date/isSameOrAfter/index.ts
@@ -0,0 +1,2 @@
+export { isSameOrAfter } from './isSameOrAfter'
+export type { IsSameOrAfterOptions, IsSameOrAfterUnit } from './isSameOrAfter'
diff --git a/packages/time/src/date/isSameOrAfter/isSameOrAfter.ts b/packages/time/src/date/isSameOrAfter/isSameOrAfter.ts
new file mode 100644
index 00000000..17407a32
--- /dev/null
+++ b/packages/time/src/date/isSameOrAfter/isSameOrAfter.ts
@@ -0,0 +1,46 @@
+import { Temporal } from '@js-temporal/polyfill'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+import { normalizeWeek } from '~/date/helpers'
+import { startOf } from '~/date/startOf/startOf'
+
+export type IsSameOrAfterUnit =
+  | 'year'
+  | 'month'
+  | 'week'
+  | 'day'
+  | 'hour'
+  | 'minute'
+  | 'second'
+  | 'millisecond'
+
+export interface IsSameOrAfterOptions extends DateOptions {
+  unit: IsSameOrAfterUnit
+}
+
+/**
+ * isSameOrAfter
+ * Returns true if the first date/time instance is the same as or after the second date/time instance at the specified unit level
+ */
+export function isSameOrAfter(
+  date1: DateInput,
+  date2: DateInput,
+  options: IsSameOrAfterOptions,
+): boolean {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } = options
+
+  const startOf1 = startOf(date1, { unit: options.unit, timeZone, calendar })
+  const startOf2 = startOf(date2, { unit: options.unit, timeZone, calendar })
+  const zdt1 = startOf1.asZonedDateTime()
+  const zdt2 = startOf2.asZonedDateTime()
+
+  if (options.unit === 'week') {
+    const normalized1 = normalizeWeek(zdt1)
+    const normalized2 = normalizeWeek(zdt2)
+    return Temporal.ZonedDateTime.compare(normalized1, normalized2) >= 0
+  }
+
+  return Temporal.ZonedDateTime.compare(zdt1, zdt2) >= 0
+}
diff --git a/packages/time/src/date/isSameOrAfter/tests/isSameOrAfter.test.ts b/packages/time/src/date/isSameOrAfter/tests/isSameOrAfter.test.ts
new file mode 100644
index 00000000..45689244
--- /dev/null
+++ b/packages/time/src/date/isSameOrAfter/tests/isSameOrAfter.test.ts
@@ -0,0 +1,181 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { isSameOrAfter } from '../isSameOrAfter'
+
+describe('isSameOrAfter', () => {
+  describe('with string inputs', () => {
+    test('should return true when first date is after second date at day level', () => {
+      const result = isSameOrAfter(
+        '2024-03-16T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          unit: 'day',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return true when dates are equal at day level', () => {
+      const result = isSameOrAfter(
+        '2024-03-15T23:59:59Z',
+        '2024-03-15T10:00:00Z',
+        {
+          unit: 'day',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false when first date is before second date at day level', () => {
+      const result = isSameOrAfter(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T14:42:12.789Z',
+        {
+          unit: 'day',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should handle year level comparison', () => {
+      const result = isSameOrAfter(
+        '2024-12-31T23:59:59Z',
+        '2024-01-01T00:00:00Z',
+        {
+          unit: 'year',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle month level comparison', () => {
+      const result = isSameOrAfter(
+        '2024-03-31T23:59:59Z',
+        '2024-03-01T00:00:00Z',
+        {
+          unit: 'month',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle week level comparison', () => {
+      const result = isSameOrAfter(
+        '2024-03-17T23:59:59Z',
+        '2024-03-11T00:00:00Z',
+        {
+          unit: 'week',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle hour level comparison', () => {
+      const result = isSameOrAfter(
+        '2024-03-15T14:59:59Z',
+        '2024-03-15T14:00:00Z',
+        {
+          unit: 'hour',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const date1 = new Date('2024-03-15T23:59:59Z')
+      const date2 = new Date('2024-03-15T10:00:00Z')
+      const result = isSameOrAfter(date1, date2, {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const date1 = new Date('2024-03-15T23:59:59Z').getTime()
+      const date2 = new Date('2024-03-15T10:00:00Z').getTime()
+      const result = isSameOrAfter(date1, date2, {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt1 = Temporal.ZonedDateTime.from(
+        '2024-03-15T23:59:59Z[UTC][u-ca=gregory]',
+      )
+      const zdt2 = Temporal.ZonedDateTime.from(
+        '2024-03-15T10:00:00Z[UTC][u-ca=gregory]',
+      )
+      const result = isSameOrAfter(zdt1, zdt2, {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = isSameOrAfter(
+        '2024-03-15T19:00:00Z',
+        '2024-03-15T14:00:00Z',
+        {
+          unit: 'day',
+          timeZone: 'America/New_York',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = isSameOrAfter(
+        '2024-03-15T23:59:59Z',
+        '2024-03-15T10:00:00Z',
+        {
+          unit: 'day',
+          calendar: 'japanese',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle different years correctly', () => {
+      const result = isSameOrAfter(
+        '2024-01-01T00:00:00Z',
+        '2023-12-31T23:59:59Z',
+        {
+          unit: 'year',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle leap year dates', () => {
+      const result = isSameOrAfter(
+        '2024-02-29T00:00:00Z',
+        '2024-02-28T00:00:00Z',
+        {
+          unit: 'day',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+})
diff --git a/packages/time/src/date/isSameOrBefore/index.ts b/packages/time/src/date/isSameOrBefore/index.ts
new file mode 100644
index 00000000..a77c2ffc
--- /dev/null
+++ b/packages/time/src/date/isSameOrBefore/index.ts
@@ -0,0 +1,5 @@
+export { isSameOrBefore } from './isSameOrBefore'
+export type {
+  IsSameOrBeforeOptions,
+  IsSameOrBeforeUnit,
+} from './isSameOrBefore'
diff --git a/packages/time/src/date/isSameOrBefore/isSameOrBefore.ts b/packages/time/src/date/isSameOrBefore/isSameOrBefore.ts
new file mode 100644
index 00000000..fac1ef3c
--- /dev/null
+++ b/packages/time/src/date/isSameOrBefore/isSameOrBefore.ts
@@ -0,0 +1,46 @@
+import { Temporal } from '@js-temporal/polyfill'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+import { normalizeWeek } from '~/date/helpers'
+import { startOf } from '~/date/startOf/startOf'
+
+export type IsSameOrBeforeUnit =
+  | 'year'
+  | 'month'
+  | 'week'
+  | 'day'
+  | 'hour'
+  | 'minute'
+  | 'second'
+  | 'millisecond'
+
+export interface IsSameOrBeforeOptions extends DateOptions {
+  unit: IsSameOrBeforeUnit
+}
+
+/**
+ * isSameOrBefore
+ * Returns true if the first date/time instance is the same as or before the second date/time instance at the specified unit level
+ */
+export function isSameOrBefore(
+  date1: DateInput,
+  date2: DateInput,
+  options: IsSameOrBeforeOptions,
+): boolean {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } = options
+
+  const startOf1 = startOf(date1, { unit: options.unit, timeZone, calendar })
+  const startOf2 = startOf(date2, { unit: options.unit, timeZone, calendar })
+  const zdt1 = startOf1.asZonedDateTime()
+  const zdt2 = startOf2.asZonedDateTime()
+
+  if (options.unit === 'week') {
+    const normalized1 = normalizeWeek(zdt1)
+    const normalized2 = normalizeWeek(zdt2)
+    return Temporal.ZonedDateTime.compare(normalized1, normalized2) <= 0
+  }
+
+  return Temporal.ZonedDateTime.compare(zdt1, zdt2) <= 0
+}
diff --git a/packages/time/src/date/isSameOrBefore/tests/isSameOrBefore.test.ts b/packages/time/src/date/isSameOrBefore/tests/isSameOrBefore.test.ts
new file mode 100644
index 00000000..b3891531
--- /dev/null
+++ b/packages/time/src/date/isSameOrBefore/tests/isSameOrBefore.test.ts
@@ -0,0 +1,181 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { isSameOrBefore } from '../isSameOrBefore'
+
+describe('isSameOrBefore', () => {
+  describe('with string inputs', () => {
+    test('should return true when first date is before second date at day level', () => {
+      const result = isSameOrBefore(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T14:42:12.789Z',
+        {
+          unit: 'day',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return true when dates are equal at day level', () => {
+      const result = isSameOrBefore(
+        '2024-03-15T10:00:00Z',
+        '2024-03-15T23:59:59Z',
+        {
+          unit: 'day',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should return false when first date is after second date at day level', () => {
+      const result = isSameOrBefore(
+        '2024-03-16T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          unit: 'day',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(false)
+    })
+
+    test('should handle year level comparison', () => {
+      const result = isSameOrBefore(
+        '2024-03-15T14:42:12.789Z',
+        '2024-12-31T23:59:59Z',
+        {
+          unit: 'year',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle month level comparison', () => {
+      const result = isSameOrBefore(
+        '2024-03-01T00:00:00Z',
+        '2024-03-31T23:59:59Z',
+        {
+          unit: 'month',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle week level comparison', () => {
+      const result = isSameOrBefore(
+        '2024-03-11T00:00:00Z',
+        '2024-03-17T23:59:59Z',
+        {
+          unit: 'week',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle hour level comparison', () => {
+      const result = isSameOrBefore(
+        '2024-03-15T14:00:00Z',
+        '2024-03-15T14:59:59Z',
+        {
+          unit: 'hour',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const date1 = new Date('2024-03-15T10:00:00Z')
+      const date2 = new Date('2024-03-15T23:59:59Z')
+      const result = isSameOrBefore(date1, date2, {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const date1 = new Date('2024-03-15T10:00:00Z').getTime()
+      const date2 = new Date('2024-03-15T23:59:59Z').getTime()
+      const result = isSameOrBefore(date1, date2, {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt1 = Temporal.ZonedDateTime.from(
+        '2024-03-15T10:00:00Z[UTC][u-ca=gregory]',
+      )
+      const zdt2 = Temporal.ZonedDateTime.from(
+        '2024-03-15T23:59:59Z[UTC][u-ca=gregory]',
+      )
+      const result = isSameOrBefore(zdt1, zdt2, {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = isSameOrBefore(
+        '2024-03-15T14:00:00Z',
+        '2024-03-15T19:00:00Z',
+        {
+          unit: 'day',
+          timeZone: 'America/New_York',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = isSameOrBefore(
+        '2024-03-15T10:00:00Z',
+        '2024-03-15T23:59:59Z',
+        {
+          unit: 'day',
+          calendar: 'japanese',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle different years correctly', () => {
+      const result = isSameOrBefore(
+        '2023-12-31T23:59:59Z',
+        '2024-01-01T00:00:00Z',
+        {
+          unit: 'year',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+
+    test('should handle leap year dates', () => {
+      const result = isSameOrBefore(
+        '2024-02-28T00:00:00Z',
+        '2024-02-29T00:00:00Z',
+        {
+          unit: 'day',
+          timeZone: 'UTC',
+        },
+      )
+      expect(result).toBe(true)
+    })
+  })
+})
diff --git a/packages/time/src/date/isValidDate/index.ts b/packages/time/src/date/isValidDate/index.ts
new file mode 100644
index 00000000..3429df3f
--- /dev/null
+++ b/packages/time/src/date/isValidDate/index.ts
@@ -0,0 +1 @@
+export * from './isValidDate'
diff --git a/packages/time/src/date/isValidDate/isValidDate.ts b/packages/time/src/date/isValidDate/isValidDate.ts
new file mode 100644
index 00000000..b7b28560
--- /dev/null
+++ b/packages/time/src/date/isValidDate/isValidDate.ts
@@ -0,0 +1,13 @@
+/**
+ * isValidDate
+ * Verifies if a date is a JS Date object and is valid
+ * @param date Date
+ * @returns boolean
+ */
+export function isValidDate(date: unknown): date is Date {
+  if (Object.prototype.toString.call(date) !== '[object Date]') {
+    return false
+  }
+  const dateObj = date as Date
+  return dateObj.getTime() === dateObj.getTime()
+}
diff --git a/packages/time/src/date/isValidDate/tests/isValidDate.test.ts b/packages/time/src/date/isValidDate/tests/isValidDate.test.ts
new file mode 100644
index 00000000..50778777
--- /dev/null
+++ b/packages/time/src/date/isValidDate/tests/isValidDate.test.ts
@@ -0,0 +1,16 @@
+import { describe, expect, test } from 'vitest'
+import { isValidDate } from '../isValidDate'
+
+describe('isValidDate', () => {
+  test('should return true for a valid date', () => {
+    expect(isValidDate(new Date())).toBe(true)
+  })
+
+  test('should return false for an invalid date', () => {
+    expect(isValidDate(new Date('invalid'))).toBe(false)
+  })
+
+  test('should return false for null', () => {
+    expect(isValidDate(null)).toBe(false)
+  })
+})
diff --git a/packages/time/src/date/isWeekend/index.ts b/packages/time/src/date/isWeekend/index.ts
new file mode 100644
index 00000000..2c905cb8
--- /dev/null
+++ b/packages/time/src/date/isWeekend/index.ts
@@ -0,0 +1 @@
+export * from './isWeekend'
diff --git a/packages/time/src/date/isWeekend/isWeekend.ts b/packages/time/src/date/isWeekend/isWeekend.ts
new file mode 100644
index 00000000..21aeb57b
--- /dev/null
+++ b/packages/time/src/date/isWeekend/isWeekend.ts
@@ -0,0 +1,34 @@
+import type { DateInput, DateOptions } from '../types'
+import { toZonedDateTime } from '~/date/helpers'
+import { getDateTimeDefaults } from '~/utils'
+import { getWeekInfo } from '../../polyfills/getWeekInfo'
+
+export interface IsWeekendOptions extends DateOptions {
+  locale?: string
+}
+
+/**
+ * isWeekend
+ * Returns true if the date falls on a weekend based on locale-specific week info
+ */
+export function isWeekend(
+  date: DateInput,
+  options?: IsWeekendOptions,
+): boolean {
+  const {
+    timeZone: defaultTimeZone,
+    calendar: defaultCalendar,
+    locale: defaultLocale,
+  } = getDateTimeDefaults()
+  const {
+    timeZone = defaultTimeZone,
+    calendar = defaultCalendar,
+    locale = defaultLocale,
+  } = options ?? {}
+
+  const zdt = toZonedDateTime(date, timeZone, calendar)
+  const dayOfWeek = zdt.dayOfWeek
+  const weekInfo = getWeekInfo(locale)
+
+  return weekInfo.weekend.includes(dayOfWeek)
+}
diff --git a/packages/time/src/date/isWeekend/tests/isWeekend.test.ts b/packages/time/src/date/isWeekend/tests/isWeekend.test.ts
new file mode 100644
index 00000000..603c72e8
--- /dev/null
+++ b/packages/time/src/date/isWeekend/tests/isWeekend.test.ts
@@ -0,0 +1,221 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { isWeekend } from '../isWeekend'
+
+describe('isWeekend', () => {
+  describe('weekend days', () => {
+    test('should return true for Saturday', () => {
+      const result = isWeekend('2024-03-16T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true for Sunday', () => {
+      const result = isWeekend('2024-03-17T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true for Saturday at midnight', () => {
+      const result = isWeekend('2024-03-16T00:00:00Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should return true for Sunday at end of day', () => {
+      const result = isWeekend('2024-03-17T23:59:59Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('weekday days', () => {
+    test('should return false for Monday', () => {
+      const result = isWeekend('2024-03-18T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should return false for Tuesday', () => {
+      const result = isWeekend('2024-03-19T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should return false for Wednesday', () => {
+      const result = isWeekend('2024-03-20T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should return false for Thursday', () => {
+      const result = isWeekend('2024-03-21T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should return false for Friday', () => {
+      const result = isWeekend('2024-03-22T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date object', () => {
+      const date = new Date('2024-03-16T14:42:12.789Z')
+      const result = isWeekend(date, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2024-03-16T14:42:12.789Z').getTime()
+      const result = isWeekend(epoch, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-16T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const result = isWeekend(zdt, {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should work with date string', () => {
+      const result = isWeekend('2024-03-16T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timeZone option', () => {
+      const result = isWeekend('2024-03-16T14:42:12.789Z', {
+        timeZone: 'America/New_York',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should use default timeZone when not provided', () => {
+      const result = isWeekend('2024-03-16T14:42:12.789Z')
+      expect(result).toBe(true)
+    })
+
+    test('should handle timezone differences correctly', () => {
+      const saturdayUTC = '2024-03-16T23:00:00Z'
+      const result1 = isWeekend(saturdayUTC, {
+        timeZone: 'UTC',
+      })
+      const result2 = isWeekend(saturdayUTC, {
+        timeZone: 'America/New_York',
+      })
+      expect(result1).toBe(true)
+      expect(result2).toBe(true)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar option', () => {
+      const result = isWeekend('2024-03-16T14:42:12.789Z', {
+        calendar: 'japanese',
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should use default calendar when not provided', () => {
+      const result = isWeekend('2024-03-16T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle year boundaries correctly', () => {
+      const result = isWeekend('2023-12-31T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(true)
+    })
+
+    test('should handle leap year dates correctly', () => {
+      const result = isWeekend('2024-02-29T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      expect(result).toBe(false)
+    })
+
+    test('should handle all days of the week correctly', () => {
+      const monday = isWeekend('2024-03-18T00:00:00Z', { timeZone: 'UTC' })
+      const tuesday = isWeekend('2024-03-19T00:00:00Z', { timeZone: 'UTC' })
+      const wednesday = isWeekend('2024-03-20T00:00:00Z', { timeZone: 'UTC' })
+      const thursday = isWeekend('2024-03-21T00:00:00Z', { timeZone: 'UTC' })
+      const friday = isWeekend('2024-03-22T00:00:00Z', { timeZone: 'UTC' })
+      const saturday = isWeekend('2024-03-23T00:00:00Z', { timeZone: 'UTC' })
+      const sunday = isWeekend('2024-03-24T00:00:00Z', { timeZone: 'UTC' })
+
+      expect(monday).toBe(false)
+      expect(tuesday).toBe(false)
+      expect(wednesday).toBe(false)
+      expect(thursday).toBe(false)
+      expect(friday).toBe(false)
+      expect(saturday).toBe(true)
+      expect(sunday).toBe(true)
+    })
+  })
+
+  describe('locale-specific weekend handling', () => {
+    test('should respect Arabic locale (Friday-Saturday weekend)', () => {
+      const friday = isWeekend('2024-03-15T14:42:12.789Z', {
+        locale: 'ar-SA',
+        timeZone: 'UTC',
+      })
+      const saturday = isWeekend('2024-03-16T14:42:12.789Z', {
+        locale: 'ar-SA',
+        timeZone: 'UTC',
+      })
+      const sunday = isWeekend('2024-03-17T14:42:12.789Z', {
+        locale: 'ar-SA',
+        timeZone: 'UTC',
+      })
+
+      expect(friday).toBe(true)
+      expect(saturday).toBe(true)
+      expect(sunday).toBe(false)
+    })
+
+    test('should respect default locale (Saturday-Sunday weekend)', () => {
+      const saturday = isWeekend('2024-03-16T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      const sunday = isWeekend('2024-03-17T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+      const monday = isWeekend('2024-03-18T14:42:12.789Z', {
+        timeZone: 'UTC',
+      })
+
+      expect(saturday).toBe(true)
+      expect(sunday).toBe(true)
+      expect(monday).toBe(false)
+    })
+  })
+})
diff --git a/packages/time/src/date/max/index.ts b/packages/time/src/date/max/index.ts
new file mode 100644
index 00000000..82263ff2
--- /dev/null
+++ b/packages/time/src/date/max/index.ts
@@ -0,0 +1 @@
+export * from './max'
diff --git a/packages/time/src/date/max/max.ts b/packages/time/src/date/max/max.ts
new file mode 100644
index 00000000..685b31ea
--- /dev/null
+++ b/packages/time/src/date/max/max.ts
@@ -0,0 +1,33 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { toZonedDateTime } from '../helpers'
+import { createDateOperationResult } from '../withDateOperation'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface MaxOptions extends DateOptions {}
+
+export function max(dates: Array<DateInput>, options?: MaxOptions) {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  if (dates.length === 0) {
+    throw new Error('max requires at least one date')
+  }
+
+  let maxZdt = toZonedDateTime(dates[0]!, timeZone, calendar)
+
+  for (let i = 1; i < dates.length; i++) {
+    const zdt = toZonedDateTime(dates[i]!, timeZone, calendar)
+    if (Temporal.ZonedDateTime.compare(zdt, maxZdt) > 0) {
+      maxZdt = zdt
+    }
+  }
+
+  return createDateOperationResult(maxZdt, {
+    timeZone,
+    calendar,
+    returnFormat: 'standard',
+  })
+}
diff --git a/packages/time/src/date/max/tests/max.test.ts b/packages/time/src/date/max/tests/max.test.ts
new file mode 100644
index 00000000..8bf7a826
--- /dev/null
+++ b/packages/time/src/date/max/tests/max.test.ts
@@ -0,0 +1,86 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { max } from '../max'
+
+describe('max', () => {
+  describe('with string inputs', () => {
+    test('should return latest date', () => {
+      const result = max(
+        [
+          '2024-03-15T00:00:00Z',
+          '2024-03-01T00:00:00Z',
+          '2024-03-31T00:00:00Z',
+        ],
+        { timeZone: 'UTC' },
+      )
+      expect(result.value).toBe('2024-03-31T00:00:00Z')
+    })
+
+    test('should work with single date', () => {
+      const result = max(['2024-03-15T00:00:00Z'], { timeZone: 'UTC' })
+      expect(result.value).toBe('2024-03-15T00:00:00Z')
+    })
+
+    test('should work with two dates', () => {
+      const result = max(['2024-03-31T00:00:00Z', '2024-03-01T00:00:00Z'], {
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-31T00:00:00Z')
+    })
+  })
+
+  describe('with mixed input types', () => {
+    test('should work with mixed Date, string, and epoch', () => {
+      const result = max(
+        [
+          '2024-03-15T00:00:00Z',
+          new Date('2024-03-01T00:00:00Z'),
+          new Date('2024-03-31T00:00:00Z').getTime(),
+        ],
+        { timeZone: 'UTC' },
+      )
+      expect(result.value).toBe('2024-03-31T00:00:00Z')
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const result = max(
+        [
+          Temporal.ZonedDateTime.from(
+            '2024-03-15T00:00:00Z[UTC][u-ca=gregory]',
+          ),
+          Temporal.ZonedDateTime.from(
+            '2024-03-31T00:00:00Z[UTC][u-ca=gregory]',
+          ),
+        ],
+        { timeZone: 'UTC' },
+      )
+      expect(result.value).toBe('2024-03-31T00:00:00Z')
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = max(['2024-03-15T00:00:00Z', '2024-03-01T00:00:00Z'], {
+        timeZone: 'America/New_York',
+      })
+      expect(result.timeZone).toBe('America/New_York')
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = max(['2024-03-15T00:00:00Z', '2024-03-01T00:00:00Z'], {
+        calendar: 'japanese',
+      })
+      expect(result.calendar).toBe('japanese')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should throw on empty array', () => {
+      expect(() => max([], { timeZone: 'UTC' })).toThrow(
+        'max requires at least one date',
+      )
+    })
+  })
+})
diff --git a/packages/time/src/date/min/index.ts b/packages/time/src/date/min/index.ts
new file mode 100644
index 00000000..1bec140a
--- /dev/null
+++ b/packages/time/src/date/min/index.ts
@@ -0,0 +1 @@
+export * from './min'
diff --git a/packages/time/src/date/min/min.ts b/packages/time/src/date/min/min.ts
new file mode 100644
index 00000000..751bd37b
--- /dev/null
+++ b/packages/time/src/date/min/min.ts
@@ -0,0 +1,33 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { toZonedDateTime } from '../helpers'
+import { createDateOperationResult } from '../withDateOperation'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface MinOptions extends DateOptions {}
+
+export function min(dates: Array<DateInput>, options?: MinOptions) {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } =
+    options ?? {}
+
+  if (dates.length === 0) {
+    throw new Error('min requires at least one date')
+  }
+
+  let minZdt = toZonedDateTime(dates[0]!, timeZone, calendar)
+
+  for (let i = 1; i < dates.length; i++) {
+    const zdt = toZonedDateTime(dates[i]!, timeZone, calendar)
+    if (Temporal.ZonedDateTime.compare(zdt, minZdt) < 0) {
+      minZdt = zdt
+    }
+  }
+
+  return createDateOperationResult(minZdt, {
+    timeZone,
+    calendar,
+    returnFormat: 'standard',
+  })
+}
diff --git a/packages/time/src/date/min/tests/min.test.ts b/packages/time/src/date/min/tests/min.test.ts
new file mode 100644
index 00000000..5d12b86c
--- /dev/null
+++ b/packages/time/src/date/min/tests/min.test.ts
@@ -0,0 +1,86 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { min } from '../min'
+
+describe('min', () => {
+  describe('with string inputs', () => {
+    test('should return earliest date', () => {
+      const result = min(
+        [
+          '2024-03-15T00:00:00Z',
+          '2024-03-01T00:00:00Z',
+          '2024-03-31T00:00:00Z',
+        ],
+        { timeZone: 'UTC' },
+      )
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should work with single date', () => {
+      const result = min(['2024-03-15T00:00:00Z'], { timeZone: 'UTC' })
+      expect(result.value).toBe('2024-03-15T00:00:00Z')
+    })
+
+    test('should work with two dates', () => {
+      const result = min(['2024-03-31T00:00:00Z', '2024-03-01T00:00:00Z'], {
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+  })
+
+  describe('with mixed input types', () => {
+    test('should work with mixed Date, string, and epoch', () => {
+      const result = min(
+        [
+          '2024-03-15T00:00:00Z',
+          new Date('2024-03-01T00:00:00Z'),
+          new Date('2024-03-31T00:00:00Z').getTime(),
+        ],
+        { timeZone: 'UTC' },
+      )
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const result = min(
+        [
+          Temporal.ZonedDateTime.from(
+            '2024-03-15T00:00:00Z[UTC][u-ca=gregory]',
+          ),
+          Temporal.ZonedDateTime.from(
+            '2024-03-01T00:00:00Z[UTC][u-ca=gregory]',
+          ),
+        ],
+        { timeZone: 'UTC' },
+      )
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = min(['2024-03-15T00:00:00Z', '2024-03-01T00:00:00Z'], {
+        timeZone: 'America/New_York',
+      })
+      expect(result.timeZone).toBe('America/New_York')
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = min(['2024-03-15T00:00:00Z', '2024-03-01T00:00:00Z'], {
+        calendar: 'japanese',
+      })
+      expect(result.calendar).toBe('japanese')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should throw on empty array', () => {
+      expect(() => min([], { timeZone: 'UTC' })).toThrow(
+        'min requires at least one date',
+      )
+    })
+  })
+})
diff --git a/packages/time/src/date/parse/index.ts b/packages/time/src/date/parse/index.ts
new file mode 100644
index 00000000..959e55b4
--- /dev/null
+++ b/packages/time/src/date/parse/index.ts
@@ -0,0 +1 @@
+export * from './parse'
diff --git a/packages/time/src/date/parse/parse.ts b/packages/time/src/date/parse/parse.ts
new file mode 100644
index 00000000..36253211
--- /dev/null
+++ b/packages/time/src/date/parse/parse.ts
@@ -0,0 +1,224 @@
+/**
+ * rfc3339DateTimeOptionalTimeRegex
+ * Regular expression to match RFC3339 date/time strings with all optional parts
+ */
+const rfc3339DateTimeOptionalTimeRegex =
+  /^(?<fulldate>(?<year>\d{4})(?:-(?<month>0[1-9]|1[0-2])(?:-(?<day>0[1-9]|[12][0-9]|3[01]))))(?:(?:T| )(?<fulltime>(?<hour>[01][0-9]|2[0-3])(?::(?<minute>[0-5][0-9])(?::(?<second>[0-5][0-9])(?:\.(?<millisecond>\d+))?)?)?)?(?<timezone>Z|[+-](?:2[0-3]|[01][0-9]:[0-5][0-9]))?)?$/i
+
+/**
+ * timeOnlyRegex
+ * Regular expression to match time-only strings
+ */
+const timeOnlyRegex =
+  /^((?<hour>(?:2[0-3]|[0-1][0-9]))(?::(?<minute>[0-5][0-9])(?::(?<second>[0-5][0-9])(?:\.(?<millisecond>\d+))?)?)?)(?:\s(?<meridiem>(?:AM|PM)))?$/i
+
+/**
+ * dateOnlyRegex
+ * Regular expression to match date-only strings
+ */
+const dateOnlyRegex =
+  /^(?<year>\d{4})(-(?<month>0[1-9]|1[0-2]))?(-(?<day>0[1-9]|[12][0-9]|3[01]))?(?<separator>T| )?(?<timezone>Z|[+-](?:2[0-3]|[01][0-9]:[0-5][0-9]))?$/i
+
+/**
+ * isValidEpoch
+ * Verifies if a numeric value is a valid epoch date
+ * @param {number} value
+ * @returns boolean
+ */
+function isValidEpoch(value: number): boolean {
+  return value >= -8.64e12 && value <= +8.64e12
+}
+
+/**
+ * parseEpochDateTime
+ * Parses a numeric value as a date/time epoch
+ * @param {number} value
+ * @returns Date
+ */
+function parseEpochDateTime(value: number): Date {
+  // if it's a floating point number, assume it's a unix timestamp
+  const toParse = Number.isInteger(value) ? value : value * 1000
+  // but verify
+  if (isValidEpoch(toParse)) {
+    return new Date(toParse)
+  }
+  throw new Error(`"${value}" is an invalid epoch date value`)
+}
+
+/**
+ * parseDateTimeString
+ * Parses a string as a date/time string
+ * @param {string} value
+ * @returns Date
+ */
+function parseDateTimeString(value: string): Date {
+  const match =
+    rfc3339DateTimeOptionalTimeRegex.exec(value) ?? dateOnlyRegex.exec(value)
+
+  if (match?.groups) {
+    const {
+      year,
+      month = '01',
+      day = '01',
+      hour = '00',
+      minute = '00',
+      second = '00',
+      millisecond = '000',
+      timezone = '',
+    } = match.groups
+
+    return new Date(
+      `${year}-${month}-${day}T${hour}:${minute}:${second}.${millisecond}${timezone}`,
+    )
+  }
+  throw new Error(`"${value}" is an invalid RFC339 Internet Date Time string`)
+}
+
+/**
+ * parseTimeOnlyString
+ * Parses a string as a time-only string
+ * @param {string} value
+ * @returns Date
+ */
+function parseTimeOnlyString(value: string): Date {
+  const match = timeOnlyRegex.exec(value)
+  if (match?.groups) {
+    const now = new Date()
+    const {
+      hour = '00',
+      minute = '00',
+      second = '00',
+      millisecond = '000',
+      meridiem,
+    } = match.groups
+    // convert 12 hour time to 24
+    let trueHour = Number(hour)
+    if (meridiem) {
+      if (trueHour > 12) {
+        throw new Error(`"${value}" is an invalid time string`)
+      }
+      if (meridiem.toLowerCase() === 'pm' && trueHour < 12) {
+        trueHour += 12
+      }
+    }
+    now.setHours(trueHour, Number(minute), Number(second), Number(millisecond))
+    return now
+  }
+  throw new Error(`"${value}" is an invalid time string`)
+}
+
+/**
+ * parseDateOrTimeString
+ * Parses a string as a date/time or time string
+ * @param {string} value
+ * @returns Date
+ */
+function parseDateOrTimeString(value: string): Date {
+  const match = timeOnlyRegex.exec(value)
+  if (match) {
+    return parseTimeOnlyString(value)
+  }
+  return parseDateTimeString(value)
+}
+
+/**
+ * parse
+ * Parses a string, number or Date object as a Date
+ * @param {string | number | Date} value
+ * @returns Date | undefined
+ */
+export function parse(value: string | number | Date): Date | undefined {
+  if (!value) return undefined
+  if (typeof value === 'string') {
+    return parseDateOrTimeString(value)
+  } else if (typeof value === 'number') {
+    return parseEpochDateTime(value)
+  }
+  return value
+}
+
+interface DateParts {
+  year: number
+  month: number
+  day: number
+  hour: number
+  minute: number
+  second: number
+}
+
+const pad = (n: number): string => String(n).padStart(2, '0')
+
+function extractDateParts(value: string | Date | number): DateParts {
+  if (value instanceof Date) {
+    return {
+      year: value.getFullYear(),
+      month: value.getMonth() + 1,
+      day: value.getDate(),
+      hour: value.getHours(),
+      minute: value.getMinutes(),
+      second: value.getSeconds(),
+    }
+  }
+
+  if (typeof value === 'number') {
+    return extractDateParts(parseEpochDateTime(value))
+  }
+
+  const match =
+    rfc3339DateTimeOptionalTimeRegex.exec(value) ?? dateOnlyRegex.exec(value)
+
+  if (!match?.groups) {
+    throw new Error(
+      `"${value}" is not a valid date/time string. Expected formats: YYYY-MM-DD, YYYY-MM-DDTHH:mm, or YYYY-MM-DDTHH:mm:ss`,
+    )
+  }
+
+  return {
+    year: Number(match.groups.year),
+    month: Number(match.groups.month ?? '01'),
+    day: Number(match.groups.day ?? '01'),
+    hour: Number(match.groups.hour ?? '00'),
+    minute: Number(match.groups.minute ?? '00'),
+    second: Number(match.groups.second ?? '00'),
+  }
+}
+
+/**
+ * toPlainDateTimeString
+ * Converts a flexible date/time input (string, Date, or epoch number)
+ * into a Temporal.PlainDateTime-compatible ISO string (YYYY-MM-DDTHH:mm:ss).
+ */
+export function toPlainDateTimeString(value: string | Date | number): string {
+  const { year, month, day, hour, minute, second } = extractDateParts(value)
+  return `${year}-${pad(month)}-${pad(day)}T${pad(hour)}:${pad(minute)}:${pad(second)}`
+}
+
+/**
+ * toPlainDateString
+ * Converts a flexible date/time input (string, Date, or epoch number)
+ * into a Temporal.PlainDate-compatible ISO string (YYYY-MM-DD).
+ */
+export function toPlainDateString(value: string | Date | number): string {
+  const { year, month, day } = extractDateParts(value)
+  return `${year}-${pad(month)}-${pad(day)}`
+}
+
+/**
+ * toPlainTimeString
+ * Converts a flexible date/time input (string, Date, or epoch number)
+ * into a time-only string (HH:mm).
+ */
+export function toPlainTimeString(value: string | Date | number): string {
+  const { hour, minute } = extractDateParts(value)
+  return `${pad(hour)}:${pad(minute)}`
+}
+
+/**
+ * toDate
+ * Converts a flexible date/time input (string, Date, or epoch number)
+ * into a local-time Date at midnight, extracting only the date portion.
+ */
+export function toDate(value: string | Date | number): Date {
+  const { year, month, day } = extractDateParts(value)
+  return new Date(year, month - 1, day)
+}
diff --git a/packages/time/src/date/parse/parsingDates.md b/packages/time/src/date/parse/parsingDates.md
new file mode 100644
index 00000000..f127e9e6
--- /dev/null
+++ b/packages/time/src/date/parse/parsingDates.md
@@ -0,0 +1,82 @@
+# Parsing Dates
+
+TanStack Time will include a basic parser for parsing dates and times. It will natively parse dates in the following formats:
+
+- RFC3339 Internet Date/Time Format
+- Unix Timestamp (Epoch Time)
+- Existing Date object
+- a "plain time" string
+
+If taking an existing Date object, it will just copy it to a new object, as Date objects are mutable.
+
+A Unix Timestamp (known as an Epoch) is the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970, not counting leap seconds. It is used widely in computer systems and is the standard way to represent a date and time in many programming languages. A Unix Timestamp already represents a specific point in time, so it is easily used to create a new Date object.
+
+Parsing a date from a string is a bit more complex. The RFC3339 Internet Date/Time Format is a profile of the ISO 8601 standard for date and time formats. It is the most accurate way to represent a date and time, and it is the format that TanStack Time will use to parse dates from strings. It is also the format that TanStack Time will use to represent dates as strings.
+
+## Date/Time Parts
+
+The RFC3339 standard allows for the following date/time parts:
+
+> [4 digit year[-2 digit month[-2 digit day]]][separator (t|T|" ")][2 digit hour[:2 digit minute[:2 digit second[.3 digit millisecond]]]][timezone/offset(z|Z|[(+|-)2 digit hour[:2 digit minute]])]
+
+In accordance with the standard, if 'T' is used as a separator it may be in upper or lower case. If 'Z' is used as a timezone/offset, it may be in upper or lower case. The 'Z' timezone/offset is often referred to as 'Zulu' time, and represents UTC.
+
+## Deviating From the RFC3339 Standard, and Why
+
+For developers utilizing a fully qualified RFC3339 Internet Date/Time Format string, including timezone or offset, the parser will parse the string according to standard. However there are some caveats to the standard that the parser should correct.
+
+There are irregularities in the way a date instance is created from an RFC3339 string, compared to what most developers believe the string to represent. For example, look at the following example:
+
+```javascript
+const formatter = new Intl.DateTimeFormat('en-US', {
+  year: 'numeric',
+  month: '2-digit',
+  day: '2-digit',
+  hour: '2-digit',
+  minute: '2-digit',
+  second: '2-digit',
+  fractionalSecondDigits: 3,
+  timeZoneName: 'short',
+})
+const dateString = '2024-12-14'
+const date = new Date(dateString)
+// a browser in the Eastern Time Zone will return:
+// Fri Dec 13 2024 19:00:00 GMT-0500 (Eastern Standard Time)
+formatter.format(date)
+// "12/13/2024, 7:00:00 PM EST"
+const dateString2 = '2024-12-14T00:00:00'
+const date2 = new Date(dateString2)
+// a browser in the Eastern Time Zone will return:
+// Sat Dec 14 2024 00:00:00 GMT-0500 (Eastern Standard Time)
+formatter.format(date2)
+// "12/14/2024, 12:00:00 AM EST"
+```
+
+The valid RFC3339 string of `2024-12-14` is meant to represent "December 14, 2024", however according to the standard all parts are relative to UTC date/time, and later interpreted to the browser local timezone. A developer would consider this to be the beginning of the day, for the timezone of the user, since no time or timezone/offset is specified. However, the Date object will interpret this as "December 13, 2024" at 7:00 PM, for a browser in the Eastern Time Zone. This is because the Date object will interpret the string as a UTC date, and then convert it to the local time zone. This is a major area of confusion for developers, and not the behavior that a developer would expect, and the behavior that the parser should correct.
+
+A parser should parse an RFC3339 string according to what date parts have been supplied. A valid RFC3339 string considers all date parts to be optional (aside from year), and the parser should interpret the string as such. If a date part is not supplied, the parser should assume the beginning for that part. If a time part is not supplied, the parser should assume the beginning of the day. If a timezone/offset part is not supplied, the parser should assume the local time zone. This is the behavior that the parser will implement.
+
+There are some caveats:
+
+- If a day is supplied, month and year are required.
+- If a month is supplied, year is required.
+- If a time is supplied, a full date (day, month and year) is required.
+- If milliseconds are supplied, seconds, minutes and hours are required.
+- If seconds are supplied, minutes and hours are required.
+- If minutes are supplied, hours are required.
+
+The RFC3339 standard does not allow for the inclusion of timezone/offset without a time part. However, the parser will allow for that, and assume the beginning of the day, and the given time zone. In this scenario, the timezone/offset must be preceded by the date/time separator.
+
+## Dealing With Only "Time"
+
+The Date object does not have facility for "only a time", without a date. However, the parser will allow for a "plain time" string in the format `HH:MM:SS.SSS` (hours, minutes, seconds, milliseconds). The parser will create a Date with the current 'date' of the browser, and the given time. The timezone/offset will always be assumed to be the local time zone.
+
+This allows for using the Intl.DateTimeFormat to format the time, and the parser to parse the time, without having to worry about the date.
+
+This also allows for the internal creation of Temporal.PlainTime objects, which will be used in the future for time only manipulation.
+
+## Parser output
+
+The parser is used internal to TanStack Time, to interpret the given input for future manipulation and output. While the parser will be publicly available from the API, it is not intended to be used as a general purpose date parser. The public API is available for the creation of other parsers. It is intended to be used to parse dates in the formats that TanStack Time will use to manipulate dates and times.
+
+All other public API methods will typically return RFC3339 strings representing a date/time instance (UTC), or formatted representations of the date/time instance, according to the formatter configuration.
diff --git a/packages/time/src/date/parse/tests/parse.test.ts b/packages/time/src/date/parse/tests/parse.test.ts
new file mode 100644
index 00000000..8cd9be82
--- /dev/null
+++ b/packages/time/src/date/parse/tests/parse.test.ts
@@ -0,0 +1,148 @@
+import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest'
+import { parse } from '../parse'
+
+const dateTimeFormat = new Intl.DateTimeFormat('en-US', {
+  year: 'numeric',
+  month: '2-digit',
+  day: '2-digit',
+  hour: '2-digit',
+  minute: '2-digit',
+  second: '2-digit',
+  timeZoneName: 'short',
+  timeZone: 'America/New_York',
+})
+
+const timeOnlyFormat = new Intl.DateTimeFormat('en-US', {
+  hour: '2-digit',
+  minute: '2-digit',
+  second: '2-digit',
+  timeZone: 'America/New_York',
+})
+
+describe('parse', () => {
+  beforeEach(() => {
+    vi.stubEnv('TZ', 'America/New_York')
+  })
+
+  afterEach(() => {
+    vi.unstubAllEnvs()
+  })
+
+  test('should parse a valid year only date string', () => {
+    const date = parse('2021')
+    expect(dateTimeFormat.format(date)).toBe('01/01/2021, 12:00:00 AM EST')
+  })
+
+  test('should parse a valid year and month only date string', () => {
+    const date = parse('2021-03')
+    expect(dateTimeFormat.format(date)).toBe('03/01/2021, 12:00:00 AM EST')
+  })
+
+  test('should parse a valid year, month and day only date string', () => {
+    const date = parse('2021-03-12')
+    expect(dateTimeFormat.format(date)).toBe('03/12/2021, 12:00:00 AM EST')
+  })
+
+  test('should cast date only string to UTC', () => {
+    const date = parse('2021-03-12TZ')
+    expect(dateTimeFormat.format(date)).toBe('03/11/2021, 07:00:00 PM EST')
+  })
+
+  test('should cast date only string to offset', () => {
+    const date = parse('2021-03-12T-07:00')
+    expect(dateTimeFormat.format(date)).toBe('03/12/2021, 02:00:00 AM EST')
+  })
+
+  test('should parse a valid year, month, day and hour only date/time string with separator', () => {
+    const date = parse('2021-03-12T14')
+    expect(dateTimeFormat.format(date)).toBe('03/12/2021, 02:00:00 PM EST')
+  })
+
+  test('should parse a valid year, month, day and hour only date/time string without separator', () => {
+    const date = parse('2021-03-12 16')
+    expect(dateTimeFormat.format(date)).toBe('03/12/2021, 04:00:00 PM EST')
+  })
+
+  test('should parse a valid year, month, day, hour and minute only date/time string', () => {
+    const date = parse('2021-03-12T14:42')
+    expect(dateTimeFormat.format(date)).toBe('03/12/2021, 02:42:00 PM EST')
+  })
+
+  test('should parse a valid year, month, day, hour, minute and seconds only date/time string', () => {
+    const date = parse('2021-03-12T14:42:12')
+    expect(dateTimeFormat.format(date)).toBe('03/12/2021, 02:42:12 PM EST')
+  })
+
+  test('should parse a valid UTC date/time string', () => {
+    const date = parse('2021-03-12T14:42:12Z')
+    expect(dateTimeFormat.format(date)).toBe('03/12/2021, 09:42:12 AM EST')
+  })
+
+  test('should parse a valid UTC date/time string with lower case separator and zulu', () => {
+    const date = parse('2021-03-12t14:42:12z')
+    expect(dateTimeFormat.format(date)).toBe('03/12/2021, 09:42:12 AM EST')
+  })
+
+  test('should parse a valid date/time string with offset', () => {
+    const date = parse('2021-03-12T14:42:12+09:00')
+    expect(dateTimeFormat.format(date)).toBe('03/12/2021, 12:42:12 AM EST')
+  })
+
+  test('should parse a valid epoch date/time', () => {
+    const date = parse(1711639239717)
+    expect(dateTimeFormat.format(date)).toBe('03/28/2024, 11:20:39 AM EDT')
+  })
+
+  test('should parse a valid hour and minute time string', () => {
+    const date = parse('14:00')
+    expect(timeOnlyFormat.format(date)).toBe('02:00:00 PM')
+  })
+
+  test('should parse a valid hour, minute and second time string', () => {
+    const date = parse('14:14:34')
+    expect(timeOnlyFormat.format(date)).toBe('02:14:34 PM')
+  })
+
+  test('should parse a valid hour, minute and second time string with meridiem', () => {
+    const date = parse('08:14:34 PM')
+    expect(timeOnlyFormat.format(date)).toBe('08:14:34 PM')
+  })
+
+  test('should throw an error for an invalid date string', () => {
+    expect(() => parse('2021-15-37')).toThrowError(
+      '"2021-15-37" is an invalid RFC339 Internet Date Time string',
+    )
+  })
+
+  test('should throw an error for an invalid time string', () => {
+    expect(() => parse('27:62')).toThrowError(
+      '"27:62" is an invalid RFC339 Internet Date Time string',
+    )
+  })
+
+  test('should throw an error for an invalid time string', () => {
+    expect(() => parse('14:12 PM')).toThrowError(
+      '"14:12 PM" is an invalid time string',
+    )
+  })
+
+  test('should throw an error for an invalid epoch', () => {
+    // eslint-disable-next-line no-loss-of-precision
+    expect(() => parse(9274309587123413)).toThrowError(
+      '"9274309587123412" is an invalid epoch date value',
+    )
+  })
+
+  /* test('should parse a valid time string', () => {
+    const date = parse('00:00:00.000Z');
+    expect(dateTimeFormat.format(date)).toBe('12/31/2020, 7:00:00 PM EST');
+  });
+
+  test('should throw an error for an invalid date string', () => {
+    expect(() => parse('2021-01-01T00:00:00.000')).toThrowError('"2021-01-01T00:00:00.000" is an invalid RFC339 Internet Date Time string');
+  });
+
+  test('should throw an error for an invalid time string', () => {
+    expect(() => parse('00:00:00.000')).toThrowError('"00:00:00.000" is an invalid time string');
+  }); */
+})
diff --git a/packages/time/src/date/range/index.ts b/packages/time/src/date/range/index.ts
new file mode 100644
index 00000000..29e028ca
--- /dev/null
+++ b/packages/time/src/date/range/index.ts
@@ -0,0 +1 @@
+export * from './range'
diff --git a/packages/time/src/date/range/range.ts b/packages/time/src/date/range/range.ts
new file mode 100644
index 00000000..d7982606
--- /dev/null
+++ b/packages/time/src/date/range/range.ts
@@ -0,0 +1,50 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { toZonedDateTime } from '../helpers'
+import { createDateOperationResult, resolveOptions } from '../withDateOperation'
+import type { DateOperationOptions } from '../withDateOperation'
+import type { DateInput, DurationLike } from '../types'
+
+export interface RangeOptions extends DateOperationOptions {
+  start: DateInput
+  end: DateInput
+  step: DurationLike
+}
+
+/**
+ * range
+ * Generates an array of dates from start to end at the specified step interval.
+ * The range is inclusive of both start and end (if end falls exactly on a step).
+ */
+export function range(options: RangeOptions) {
+  const { start, end, step } = options
+  const resolved = resolveOptions(options)
+  const duration = Temporal.Duration.from(step)
+
+  if (duration.blank) {
+    throw new Error('Step duration cannot be zero')
+  }
+
+  const startZdt = toZonedDateTime(start, resolved.timeZone, resolved.calendar)
+  const endZdt = toZonedDateTime(end, resolved.timeZone, resolved.calendar)
+
+  const isForward = Temporal.ZonedDateTime.compare(startZdt, endZdt) <= 0
+  const isPositiveStep = duration.sign === 1
+
+  if (isForward !== isPositiveStep) {
+    throw new Error(
+      isForward
+        ? 'Step must be positive when start is before or equal to end'
+        : 'Step must be negative when start is after end',
+    )
+  }
+
+  const result: Array<ReturnType<typeof createDateOperationResult>> = []
+  let current = startZdt
+
+  while (duration.sign * Temporal.ZonedDateTime.compare(current, endZdt) <= 0) {
+    result.push(createDateOperationResult(current, resolved))
+    current = current.add(duration)
+  }
+
+  return result
+}
diff --git a/packages/time/src/date/range/tests/range.test.ts b/packages/time/src/date/range/tests/range.test.ts
new file mode 100644
index 00000000..4416ba7a
--- /dev/null
+++ b/packages/time/src/date/range/tests/range.test.ts
@@ -0,0 +1,350 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { range } from '../range'
+
+describe('range', () => {
+  describe('with day intervals', () => {
+    test('should generate daily range', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-05T00:00:00Z',
+        step: { days: 1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(5)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+      expect(result[1]!.value).toBe('2024-03-02T00:00:00Z')
+      expect(result[2]!.value).toBe('2024-03-03T00:00:00Z')
+      expect(result[3]!.value).toBe('2024-03-04T00:00:00Z')
+      expect(result[4]!.value).toBe('2024-03-05T00:00:00Z')
+    })
+
+    test('should generate range with 2-day intervals', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-07T00:00:00Z',
+        step: { days: 2 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(4)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+      expect(result[1]!.value).toBe('2024-03-03T00:00:00Z')
+      expect(result[2]!.value).toBe('2024-03-05T00:00:00Z')
+      expect(result[3]!.value).toBe('2024-03-07T00:00:00Z')
+    })
+  })
+
+  describe('with hour intervals', () => {
+    test('should generate hourly range', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-01T03:00:00Z',
+        step: { hours: 1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(4)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+      expect(result[1]!.value).toBe('2024-03-01T01:00:00Z')
+      expect(result[2]!.value).toBe('2024-03-01T02:00:00Z')
+      expect(result[3]!.value).toBe('2024-03-01T03:00:00Z')
+    })
+
+    test('should generate range with 6-hour intervals', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-02T00:00:00Z',
+        step: { hours: 6 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(5)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+      expect(result[1]!.value).toBe('2024-03-01T06:00:00Z')
+      expect(result[2]!.value).toBe('2024-03-01T12:00:00Z')
+      expect(result[3]!.value).toBe('2024-03-01T18:00:00Z')
+      expect(result[4]!.value).toBe('2024-03-02T00:00:00Z')
+    })
+  })
+
+  describe('with week intervals', () => {
+    test('should generate weekly range', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-29T00:00:00Z',
+        step: { weeks: 1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(5)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+      expect(result[1]!.value).toBe('2024-03-08T00:00:00Z')
+      expect(result[2]!.value).toBe('2024-03-15T00:00:00Z')
+      expect(result[3]!.value).toBe('2024-03-22T00:00:00Z')
+      expect(result[4]!.value).toBe('2024-03-29T00:00:00Z')
+    })
+  })
+
+  describe('with month intervals', () => {
+    test('should generate monthly range', () => {
+      const result = range({
+        start: '2024-01-15T00:00:00Z',
+        end: '2024-05-15T00:00:00Z',
+        step: { months: 1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(5)
+      expect(result[0]!.value).toBe('2024-01-15T00:00:00Z')
+      expect(result[1]!.value).toBe('2024-02-15T00:00:00Z')
+      expect(result[2]!.value).toBe('2024-03-15T00:00:00Z')
+      expect(result[3]!.value).toBe('2024-04-15T00:00:00Z')
+      expect(result[4]!.value).toBe('2024-05-15T00:00:00Z')
+    })
+  })
+
+  describe('with minute intervals', () => {
+    test('should generate range with 15-minute intervals', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-01T01:00:00Z',
+        step: { minutes: 15 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(5)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+      expect(result[1]!.value).toBe('2024-03-01T00:15:00Z')
+      expect(result[2]!.value).toBe('2024-03-01T00:30:00Z')
+      expect(result[3]!.value).toBe('2024-03-01T00:45:00Z')
+      expect(result[4]!.value).toBe('2024-03-01T01:00:00Z')
+    })
+  })
+
+  describe('with combined intervals', () => {
+    test('should generate range with days and hours', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-03T12:00:00Z',
+        step: { days: 1, hours: 6 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(3)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+      expect(result[1]!.value).toBe('2024-03-02T06:00:00Z')
+      expect(result[2]!.value).toBe('2024-03-03T12:00:00Z')
+    })
+  })
+
+  describe('backward ranges', () => {
+    test('should generate backward daily range', () => {
+      const result = range({
+        start: '2024-03-05T00:00:00Z',
+        end: '2024-03-01T00:00:00Z',
+        step: { days: -1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(5)
+      expect(result[0]!.value).toBe('2024-03-05T00:00:00Z')
+      expect(result[1]!.value).toBe('2024-03-04T00:00:00Z')
+      expect(result[2]!.value).toBe('2024-03-03T00:00:00Z')
+      expect(result[3]!.value).toBe('2024-03-02T00:00:00Z')
+      expect(result[4]!.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should generate backward hourly range', () => {
+      const result = range({
+        start: '2024-03-01T03:00:00Z',
+        end: '2024-03-01T00:00:00Z',
+        step: { hours: -1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(4)
+      expect(result[0]!.value).toBe('2024-03-01T03:00:00Z')
+      expect(result[1]!.value).toBe('2024-03-01T02:00:00Z')
+      expect(result[2]!.value).toBe('2024-03-01T01:00:00Z')
+      expect(result[3]!.value).toBe('2024-03-01T00:00:00Z')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should return single item when start equals end', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-01T00:00:00Z',
+        step: { days: 1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(1)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should throw error for zero step', () => {
+      expect(() =>
+        range({
+          start: '2024-03-01T00:00:00Z',
+          end: '2024-03-05T00:00:00Z',
+          step: { days: 0 },
+          timeZone: 'UTC',
+        }),
+      ).toThrow('Step duration cannot be zero')
+    })
+
+    test('should throw error for negative step with forward range', () => {
+      expect(() =>
+        range({
+          start: '2024-03-01T00:00:00Z',
+          end: '2024-03-05T00:00:00Z',
+          step: { days: -1 },
+          timeZone: 'UTC',
+        }),
+      ).toThrow('Step must be positive when start is before or equal to end')
+    })
+
+    test('should throw error for positive step with backward range', () => {
+      expect(() =>
+        range({
+          start: '2024-03-05T00:00:00Z',
+          end: '2024-03-01T00:00:00Z',
+          step: { days: 1 },
+          timeZone: 'UTC',
+        }),
+      ).toThrow('Step must be negative when start is after end')
+    })
+
+    test('should handle range that does not land exactly on end', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-04T12:00:00Z',
+        step: { days: 1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(4)
+      expect(result[3]!.value).toBe('2024-03-04T00:00:00Z')
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const result = range({
+        start: new Date('2024-03-01T00:00:00Z'),
+        end: new Date('2024-03-03T00:00:00Z'),
+        step: { days: 1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(3)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should work with epoch timestamps', () => {
+      const startEpoch = new Date('2024-03-01T00:00:00Z').getTime()
+      const endEpoch = new Date('2024-03-03T00:00:00Z').getTime()
+
+      const result = range({
+        start: startEpoch,
+        end: endEpoch,
+        step: { days: 1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(3)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const startZdt = Temporal.ZonedDateTime.from(
+        '2024-03-01T00:00:00Z[UTC][u-ca=gregory]',
+      )
+      const endZdt = Temporal.ZonedDateTime.from(
+        '2024-03-03T00:00:00Z[UTC][u-ca=gregory]',
+      )
+
+      const result = range({
+        start: startZdt,
+        end: endZdt,
+        step: { days: 1 },
+        timeZone: 'UTC',
+      })
+
+      expect(result).toHaveLength(3)
+      expect(result[0]!.value).toBe('2024-03-01T00:00:00Z')
+    })
+  })
+
+  describe('output methods', () => {
+    test('asDate should return Date objects', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-02T00:00:00Z',
+        step: { days: 1 },
+        timeZone: 'UTC',
+      })
+
+      const date = result[0]!.asDate()
+      expect(date).toBeInstanceOf(Date)
+      expect(date.toISOString()).toBe('2024-03-01T00:00:00.000Z')
+    })
+
+    test('asEpoch should return epoch timestamps', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-02T00:00:00Z',
+        step: { days: 1 },
+        timeZone: 'UTC',
+      })
+
+      const epoch = result[0]!.asEpoch()
+      expect(typeof epoch).toBe('number')
+      expect(epoch).toBe(new Date('2024-03-01T00:00:00Z').getTime())
+    })
+
+    test('asZonedDateTime should return ZonedDateTime instances', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-02T00:00:00Z',
+        step: { days: 1 },
+        timeZone: 'UTC',
+      })
+
+      const zdt = result[0]!.asZonedDateTime()
+      expect(zdt).toBeInstanceOf(Temporal.ZonedDateTime)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-03T00:00:00Z',
+        step: { days: 1 },
+        timeZone: 'America/New_York',
+      })
+
+      expect(result).toHaveLength(3)
+    })
+  })
+
+  describe('returnFormat', () => {
+    test('should return long format when specified', () => {
+      const result = range({
+        start: '2024-03-01T00:00:00Z',
+        end: '2024-03-02T00:00:00Z',
+        step: { days: 1 },
+        timeZone: 'UTC',
+        calendar: 'gregory',
+        returnFormat: 'long',
+      })
+
+      expect(result[0]!.value).toContain('[UTC]')
+      expect(result[0]!.value).toContain('[u-ca=gregory]')
+    })
+  })
+})
diff --git a/packages/time/src/date/round/index.ts b/packages/time/src/date/round/index.ts
new file mode 100644
index 00000000..e48fba4f
--- /dev/null
+++ b/packages/time/src/date/round/index.ts
@@ -0,0 +1,2 @@
+export { round } from './round'
+export type { RoundOptions, RoundUnit } from './round'
diff --git a/packages/time/src/date/round/round.ts b/packages/time/src/date/round/round.ts
new file mode 100644
index 00000000..8fd3665a
--- /dev/null
+++ b/packages/time/src/date/round/round.ts
@@ -0,0 +1,32 @@
+import { withDateOperation } from '../withDateOperation'
+import type { DateInput } from '../types'
+import type { DateOperationOptions } from '../withDateOperation'
+import type { Temporal } from '@js-temporal/polyfill'
+
+export type RoundUnit =
+  | 'day'
+  | 'hour'
+  | 'minute'
+  | 'second'
+  | 'millisecond'
+  | 'microsecond'
+  | 'nanosecond'
+
+export type RoundingMode = Temporal.RoundingMode
+
+export interface RoundOptions extends DateOperationOptions {
+  unit: RoundUnit
+  roundingMode?: RoundingMode
+  roundingIncrement?: number
+}
+
+/**
+ * round
+ * Returns the date/time instance rounded to the nearest unit
+ */
+export function round(input: DateInput, options: RoundOptions) {
+  return withDateOperation<RoundOptions>((zdt, options) => {
+    const { unit, roundingMode = 'halfExpand', roundingIncrement } = options
+    return zdt.round({ smallestUnit: unit, roundingMode, roundingIncrement })
+  })(input, options)
+}
diff --git a/packages/time/src/date/round/tests/round.test.ts b/packages/time/src/date/round/tests/round.test.ts
new file mode 100644
index 00000000..901539ac
--- /dev/null
+++ b/packages/time/src/date/round/tests/round.test.ts
@@ -0,0 +1,175 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { round } from '../round'
+
+describe('round', () => {
+  describe('rounding to day', () => {
+    test('should round down when before noon', () => {
+      const result = round('2024-03-15T10:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T00:00:00Z')
+    })
+
+    test('should round up when at or after noon', () => {
+      const result = round('2024-03-15T14:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-16T00:00:00Z')
+    })
+
+    test('should round down when exactly at midnight', () => {
+      const result = round('2024-03-15T00:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T00:00:00Z')
+    })
+  })
+
+  describe('rounding to hour', () => {
+    test('should round down when before 30 minutes', () => {
+      const result = round('2024-03-15T14:20:00Z', {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:00:00Z')
+    })
+
+    test('should round up when at or after 30 minutes', () => {
+      const result = round('2024-03-15T14:30:00Z', {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T15:00:00Z')
+    })
+
+    test('should round up when exactly at 30 minutes', () => {
+      const result = round('2024-03-15T14:30:00.000Z', {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T15:00:00Z')
+    })
+  })
+
+  describe('rounding to minute', () => {
+    test('should round down when before 30 seconds', () => {
+      const result = round('2024-03-15T14:42:20Z', {
+        unit: 'minute',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:00Z')
+    })
+
+    test('should round up when at or after 30 seconds', () => {
+      const result = round('2024-03-15T14:42:30Z', {
+        unit: 'minute',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:43:00Z')
+    })
+  })
+
+  describe('rounding to second', () => {
+    test('should round down when before 500 milliseconds', () => {
+      const result = round('2024-03-15T14:42:12.400Z', {
+        unit: 'second',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:12Z')
+    })
+
+    test('should round up when at or after 500 milliseconds', () => {
+      const result = round('2024-03-15T14:42:12.500Z', {
+        unit: 'second',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:13Z')
+    })
+  })
+
+  describe('rounding to millisecond', () => {
+    test('should round to nearest millisecond', () => {
+      const result = round('2024-03-15T14:42:12.789456Z', {
+        unit: 'millisecond',
+        timeZone: 'UTC',
+      })
+      const rounded = result.asZonedDateTime()
+      expect(rounded.millisecond).toBe(789)
+      expect(rounded.microsecond).toBe(0)
+      expect(rounded.nanosecond).toBe(0)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const date = new Date('2024-03-15T14:30:00Z')
+      const result = round(date, {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T15:00:00Z')
+    })
+
+    test('should work with epoch time', () => {
+      const date = new Date('2024-03-15T14:30:00Z').getTime()
+      const result = round(date, {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T15:00:00Z')
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:30:00Z[UTC][u-ca=gregory]',
+      )
+      const result = round(zdt, {
+        unit: 'hour',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T15:00:00Z')
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = round('2024-03-15T14:30:00Z', {
+        unit: 'hour',
+        timeZone: 'America/New_York',
+      })
+      expect(result.timeZone).toBe('America/New_York')
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = round('2024-03-15T14:30:00Z', {
+        unit: 'hour',
+        calendar: 'japanese',
+      })
+      expect(result.calendar).toBe('japanese')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle year boundary correctly', () => {
+      const result = round('2023-12-31T18:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-01-01T00:00:00Z')
+    })
+
+    test('should handle month boundary correctly', () => {
+      const result = round('2024-02-29T18:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+  })
+})
diff --git a/packages/time/src/date/set/index.ts b/packages/time/src/date/set/index.ts
new file mode 100644
index 00000000..ee663561
--- /dev/null
+++ b/packages/time/src/date/set/index.ts
@@ -0,0 +1 @@
+export * from './set'
diff --git a/packages/time/src/date/set/set.ts b/packages/time/src/date/set/set.ts
new file mode 100644
index 00000000..699504ec
--- /dev/null
+++ b/packages/time/src/date/set/set.ts
@@ -0,0 +1,25 @@
+import { withDateOperation } from '../withDateOperation'
+import type { DateOperationOptions } from '../withDateOperation'
+import type { DateInput } from '../types'
+
+export interface SetFields {
+  year?: number
+  month?: number
+  day?: number
+  hour?: number
+  minute?: number
+  second?: number
+  millisecond?: number
+  microsecond?: number
+  nanosecond?: number
+}
+
+export interface SetOptions extends DateOperationOptions {
+  fields: SetFields
+}
+
+export function set(input: DateInput, options: SetOptions) {
+  return withDateOperation<SetOptions>((zdt, { fields }) => {
+    return zdt.with(fields)
+  })(input, options)
+}
diff --git a/packages/time/src/date/set/tests/set.test.ts b/packages/time/src/date/set/tests/set.test.ts
new file mode 100644
index 00000000..bfc732ae
--- /dev/null
+++ b/packages/time/src/date/set/tests/set.test.ts
@@ -0,0 +1,140 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { set } from '../set'
+
+describe('set', () => {
+  describe('with string input', () => {
+    test('should set year', () => {
+      const result = set('2024-03-15T14:42:12Z', {
+        fields: { year: 2025 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2025-03-15T14:42:12Z')
+    })
+
+    test('should set month', () => {
+      const result = set('2024-03-15T14:42:12Z', {
+        fields: { month: 5 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-05-15T14:42:12Z')
+    })
+
+    test('should set day', () => {
+      const result = set('2024-03-15T14:42:12Z', {
+        fields: { day: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T14:42:12Z')
+    })
+
+    test('should set hour', () => {
+      const result = set('2024-03-15T14:42:12Z', {
+        fields: { hour: 9 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T09:42:12Z')
+    })
+
+    test('should set minute', () => {
+      const result = set('2024-03-15T14:42:12Z', {
+        fields: { minute: 30 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:30:12Z')
+    })
+
+    test('should set second', () => {
+      const result = set('2024-03-15T14:42:12Z', {
+        fields: { second: 45 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:45Z')
+    })
+
+    test('should set millisecond', () => {
+      const result = set('2024-03-15T14:42:12Z', {
+        fields: { millisecond: 500 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:12.5Z')
+    })
+
+    test('should set multiple fields', () => {
+      const result = set('2024-03-15T14:42:12Z', {
+        fields: { year: 2025, month: 6, day: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2025-06-01T14:42:12Z')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle month end correctly', () => {
+      const result = set('2024-01-31T00:00:00Z', {
+        fields: { month: 2 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-02-29T00:00:00Z')
+    })
+
+    test('should handle leap year correctly', () => {
+      const result = set('2024-02-29T00:00:00Z', {
+        fields: { year: 2025 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2025-02-28T00:00:00Z')
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const date = new Date('2024-03-15T14:42:12Z')
+      const result = set(date, {
+        fields: { year: 2025 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2025-03-15T14:42:12Z')
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2024-03-15T14:42:12Z').getTime()
+      const result = set(epoch, {
+        fields: { year: 2025 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2025-03-15T14:42:12Z')
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:42:12Z[UTC][u-ca=gregory]',
+      )
+      const result = set(zdt, {
+        fields: { year: 2025 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2025-03-15T14:42:12Z')
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = set('2024-03-15T14:42:12Z', {
+        fields: { hour: 9 },
+        timeZone: 'America/New_York',
+      })
+      expect(result.timeZone).toBe('America/New_York')
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = set('2024-03-15T14:42:12Z', {
+        fields: { year: 2025 },
+        calendar: 'japanese',
+      })
+      expect(result.calendar).toBe('japanese')
+    })
+  })
+})
diff --git a/packages/time/src/date/since/index.ts b/packages/time/src/date/since/index.ts
new file mode 100644
index 00000000..f84080e9
--- /dev/null
+++ b/packages/time/src/date/since/index.ts
@@ -0,0 +1 @@
+export * from './since'
diff --git a/packages/time/src/date/since/since.ts b/packages/time/src/date/since/since.ts
new file mode 100644
index 00000000..4c02acc0
--- /dev/null
+++ b/packages/time/src/date/since/since.ts
@@ -0,0 +1,24 @@
+import type { Temporal } from '@js-temporal/polyfill'
+import type { DateInput, DateOptions } from '../types'
+import { toZonedDateTime } from '~/date/helpers'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface SinceOptions extends DateOptions {
+  unit: Temporal.DateTimeUnit
+}
+
+/**
+ * since
+ * Returns the duration from the first date/time instance since the second date/time instance
+ * (equivalent to: how long has it been since the second date, from the first date's perspective)
+ */
+export function since(start: DateInput, end: DateInput, options: SinceOptions) {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } = options
+
+  const startZdt = toZonedDateTime(start, timeZone, calendar)
+  const endZdt = toZonedDateTime(end, timeZone, calendar)
+  const duration = endZdt.since(startZdt)
+  return duration.total({ unit: options.unit, relativeTo: startZdt })
+}
diff --git a/packages/time/src/date/since/tests/since.test.ts b/packages/time/src/date/since/tests/since.test.ts
new file mode 100644
index 00000000..ce38ae07
--- /dev/null
+++ b/packages/time/src/date/since/tests/since.test.ts
@@ -0,0 +1,255 @@
+import { describe, expect, test } from 'vitest'
+import { since } from '../since'
+import { until } from '../../until/until'
+
+describe('since', () => {
+  describe('with string inputs', () => {
+    test('should calculate duration in days', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'day',
+        },
+      )
+      expect(duration).toBe(1)
+    })
+
+    test('should calculate duration in hours', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T16:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'hour',
+        },
+      )
+      expect(duration).toBe(2)
+    })
+
+    test('should calculate duration in minutes', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:44:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'minute',
+        },
+      )
+      expect(duration).toBe(2)
+    })
+
+    test('should calculate duration in seconds', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:57.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'second',
+        },
+      )
+      expect(duration).toBe(45)
+    })
+
+    test('should calculate duration in milliseconds', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.889Z',
+        {
+          timeZone: 'UTC',
+          unit: 'millisecond',
+        },
+      )
+      expect(duration).toBe(100)
+    })
+
+    test('should calculate complex duration', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T17:12:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'day',
+        },
+      )
+      expect(duration).toBeCloseTo(1.104, 2)
+    })
+
+    test('should calculate duration in months', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2024-04-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'month',
+        },
+      )
+      expect(duration).toBe(1)
+    })
+
+    test('should calculate duration in years', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2025-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'year',
+        },
+      )
+      expect(duration).toBe(1)
+    })
+
+    test('should calculate duration in weeks', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-29T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'week',
+        },
+      )
+      expect(duration).toBe(2)
+    })
+  })
+
+  describe('with negative duration', () => {
+    test('should return negative duration when end is before start', () => {
+      const duration = since(
+        '2024-03-16T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'day',
+        },
+      )
+      expect(duration).toBe(-1)
+    })
+
+    test('should return zero duration when dates are equal', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'day',
+        },
+      )
+      expect(duration).toBe(0)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle month boundaries', () => {
+      const duration = since('2024-03-31T00:00:00Z', '2024-04-01T00:00:00Z', {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should handle year boundaries', () => {
+      const duration = since('2024-12-31T00:00:00Z', '2025-01-01T00:00:00Z', {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should handle leap years', () => {
+      const duration = since('2024-02-28T00:00:00Z', '2024-02-29T00:00:00Z', {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should handle non-leap years', () => {
+      const duration = since('2023-02-28T00:00:00Z', '2023-03-01T00:00:00Z', {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const start = new Date('2024-03-15T14:42:12.789Z')
+      const end = new Date('2024-03-16T14:42:12.789Z')
+      const duration = since(start, end, {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should work with epoch time', () => {
+      const start = new Date('2024-03-15T14:42:12.789Z').getTime()
+      const end = new Date('2024-03-16T14:42:12.789Z').getTime()
+      const duration = since(start, end, {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should work with mixed input types', () => {
+      const start = '2024-03-15T14:42:12.789Z'
+      const end = new Date('2024-03-16T14:42:12.789Z')
+      const duration = since(start, end, {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const duration = since('2024-03-15T14:00:00Z', '2024-03-15T15:00:00Z', {
+        timeZone: 'America/New_York',
+        unit: 'hour',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should handle different timezones correctly', () => {
+      const duration = since('2024-03-15T00:00:00Z', '2024-03-15T01:00:00Z', {
+        timeZone: 'UTC',
+        unit: 'hour',
+      })
+      expect(duration).toBe(1)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const duration = since(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T14:42:12.789Z',
+        {
+          calendar: 'japanese',
+          unit: 'day',
+        },
+      )
+      expect(duration).toBe(1)
+    })
+  })
+
+  describe('comparison with until', () => {
+    test('should return same result as until', () => {
+      const start = '2024-03-15T14:42:12.789Z'
+      const end = '2024-03-16T14:42:12.789Z'
+      const options = {
+        timeZone: 'UTC' as const,
+        unit: 'day' as const,
+      }
+
+      const sinceResult = since(start, end, options)
+      const untilResult = until(start, end, options)
+
+      expect(sinceResult).toBe(untilResult)
+    })
+  })
+})
diff --git a/packages/time/src/date/startOf/index.ts b/packages/time/src/date/startOf/index.ts
new file mode 100644
index 00000000..23ad55a2
--- /dev/null
+++ b/packages/time/src/date/startOf/index.ts
@@ -0,0 +1 @@
+export * from './startOf'
diff --git a/packages/time/src/date/startOf/startOf.ts b/packages/time/src/date/startOf/startOf.ts
new file mode 100644
index 00000000..d88c0e97
--- /dev/null
+++ b/packages/time/src/date/startOf/startOf.ts
@@ -0,0 +1,85 @@
+import { withDateOperation } from '../withDateOperation'
+import type { DateOperationOptions } from '../withDateOperation'
+import type { DateInput } from '../types'
+
+export type StartOfUnit =
+  | 'year'
+  | 'month'
+  | 'week'
+  | 'day'
+  | 'hour'
+  | 'minute'
+  | 'second'
+  | 'millisecond'
+
+export interface StartOfOptions extends DateOperationOptions {
+  unit: StartOfUnit
+}
+
+/**
+ * startOf
+ * Returns the start of a given unit for a date/time instance
+ */
+export function startOf(input: DateInput, options: StartOfOptions) {
+  return withDateOperation<StartOfOptions>((zdt, { unit }) => {
+    switch (unit) {
+      case 'year':
+        return zdt.with({
+          month: 1,
+          day: 1,
+          hour: 0,
+          minute: 0,
+          second: 0,
+          millisecond: 0,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      case 'month':
+        return zdt.with({
+          day: 1,
+          hour: 0,
+          minute: 0,
+          second: 0,
+          millisecond: 0,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      case 'week': {
+        const dayOfWeek = zdt.dayOfWeek
+        const firstDayOfWeek = 1
+        const daysToSubtract = (dayOfWeek - firstDayOfWeek + 7) % 7
+        return zdt.subtract({ days: daysToSubtract })
+      }
+      case 'day':
+        return zdt.with({
+          hour: 0,
+          minute: 0,
+          second: 0,
+          millisecond: 0,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      case 'hour':
+        return zdt.with({
+          minute: 0,
+          second: 0,
+          millisecond: 0,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      case 'minute':
+        return zdt.with({
+          second: 0,
+          millisecond: 0,
+          microsecond: 0,
+          nanosecond: 0,
+        })
+      case 'second':
+        return zdt.with({ millisecond: 0, microsecond: 0, nanosecond: 0 })
+      case 'millisecond':
+        return zdt.with({ microsecond: 0, nanosecond: 0 })
+      default:
+        return zdt
+    }
+  })(input, options)
+}
diff --git a/packages/time/src/date/startOf/tests/startOf.test.ts b/packages/time/src/date/startOf/tests/startOf.test.ts
new file mode 100644
index 00000000..b557936d
--- /dev/null
+++ b/packages/time/src/date/startOf/tests/startOf.test.ts
@@ -0,0 +1,109 @@
+import { describe, expect, test } from 'vitest'
+import { startOf } from '../startOf'
+
+describe('startOf', () => {
+  describe('with string input', () => {
+    test('should return start of year', () => {
+      const result = startOf('2024-03-15T14:42:12.789Z', {
+        unit: 'year',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-01-01T00:00:00Z')
+      expect(result.options.timeZone).toBe('UTC')
+      expect(result.options.calendar).toBeDefined()
+    })
+
+    test('should return start of month', () => {
+      const result = startOf('2024-03-15T14:42:12.789Z', {
+        unit: 'month',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should return start of day', () => {
+      const result = startOf('2024-03-15T14:42:12.789Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T00:00:00Z')
+    })
+
+    test('should return start of hour', () => {
+      const result = startOf('2024-03-15T14:42:12.789Z', { unit: 'hour' })
+      expect(result.value).toContain('2024-03-15T14:00:00')
+    })
+
+    test('should return start of minute', () => {
+      const result = startOf('2024-03-15T14:42:12.789Z', { unit: 'minute' })
+      expect(result.value).toContain('2024-03-15T14:42:00')
+    })
+
+    test('should return start of second', () => {
+      const result = startOf('2024-03-15T14:42:12.789Z', { unit: 'second' })
+      expect(result.value).toContain('2024-03-15T14:42:12')
+    })
+
+    test('should return start of millisecond', () => {
+      const result = startOf('2024-03-15T14:42:12.789Z', {
+        unit: 'millisecond',
+      })
+      expect(result.value).toContain('2024-03-15T14:42:12.789')
+    })
+  })
+
+  describe('week calculation', () => {
+    test('should return start of week (Monday)', () => {
+      // 2024-03-15 is a Friday (day 5), so start of week should be Monday (2024-03-11)
+      const result = startOf('2024-03-15T14:42:12.789Z', { unit: 'week' })
+      const resultDate = new Date(result.value as unknown as string)
+      expect(resultDate.getDay()).toBe(1) // Monday
+    })
+
+    test('should return start of week for Sunday', () => {
+      // 2024-03-17 is a Sunday (day 7), so start of week should be Monday (2024-03-11)
+      const result = startOf('2024-03-17T14:42:12.789Z', { unit: 'week' })
+      const resultDate = new Date(result.value as unknown as string)
+      expect(resultDate.getDay()).toBe(1) // Monday
+    })
+
+    test('should return start of week for Monday', () => {
+      // 2024-03-11 is a Monday (day 1), so start of week should be itself
+      const result = startOf('2024-03-11T14:42:12.789Z', { unit: 'week' })
+      const resultDate = new Date(result.value as unknown as string)
+      expect(resultDate.getDay()).toBe(1) // Monday
+      expect(resultDate.toISOString()).toContain('2024-03-11')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle start of year for January 1st', () => {
+      const result = startOf('2024-01-01T00:00:00Z', {
+        unit: 'year',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-01-01T00:00:00Z')
+    })
+
+    test('should handle start of month for first day', () => {
+      const result = startOf('2024-03-01T00:00:00Z', {
+        unit: 'month',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T00:00:00Z')
+    })
+
+    test('should handle start of day at midnight', () => {
+      const result = startOf('2024-03-15T00:00:00Z', {
+        unit: 'day',
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T00:00:00Z')
+    })
+
+    test('should handle start of hour at 00:00', () => {
+      const result = startOf('2024-03-15T14:00:00Z', { unit: 'hour' })
+      expect(result.value).toContain('2024-03-15T14:00:00')
+    })
+  })
+})
diff --git a/packages/time/src/date/subtract/index.ts b/packages/time/src/date/subtract/index.ts
new file mode 100644
index 00000000..8f081bbd
--- /dev/null
+++ b/packages/time/src/date/subtract/index.ts
@@ -0,0 +1 @@
+export * from './subtract'
diff --git a/packages/time/src/date/subtract/subtract.ts b/packages/time/src/date/subtract/subtract.ts
new file mode 100644
index 00000000..f1d226ef
--- /dev/null
+++ b/packages/time/src/date/subtract/subtract.ts
@@ -0,0 +1,17 @@
+import { withDateOperation } from '../withDateOperation'
+import type { DateOperationOptions } from '../withDateOperation'
+import type { DateInput, DurationLike } from '../types'
+
+export interface SubtractOptions extends DateOperationOptions {
+  duration: DurationLike
+}
+
+/**
+ * subtract
+ * Subtracts a duration from a date/time instance
+ */
+export function subtract(input: DateInput, options: SubtractOptions) {
+  return withDateOperation<SubtractOptions>((zdt, { duration }) => {
+    return zdt.subtract(duration)
+  })(input, options)
+}
diff --git a/packages/time/src/date/subtract/tests/subtract.test.ts b/packages/time/src/date/subtract/tests/subtract.test.ts
new file mode 100644
index 00000000..55d17f5b
--- /dev/null
+++ b/packages/time/src/date/subtract/tests/subtract.test.ts
@@ -0,0 +1,207 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { subtract } from '../subtract'
+
+describe('subtract', () => {
+  describe('with string input', () => {
+    test('should subtract days', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { days: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-14T14:42:12.789Z')
+    })
+
+    test('should subtract multiple days', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { days: 7 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-08T14:42:12.789Z')
+    })
+
+    test('should subtract hours', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { hours: 2 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T12:42:12.789Z')
+    })
+
+    test('should subtract minutes', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { minutes: 30 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:12:12.789Z')
+    })
+
+    test('should subtract seconds', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { seconds: 45 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:41:27.789Z')
+    })
+
+    test('should subtract milliseconds', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { milliseconds: 100 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:12.689Z')
+    })
+
+    test('should subtract months', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { months: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-02-15T14:42:12.789Z')
+    })
+
+    test('should subtract years', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { years: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2023-03-15T14:42:12.789Z')
+    })
+
+    test('should subtract weeks', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { weeks: 2 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-01T14:42:12.789Z')
+    })
+  })
+
+  describe('with complex duration', () => {
+    test('should subtract multiple duration units', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { days: 1, hours: 2, minutes: 30 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-14T12:12:12.789Z')
+    })
+
+    test('should handle year and month subtraction', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { years: 1, months: 2 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2023-01-15T14:42:12.789Z')
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle month start correctly', () => {
+      const result = subtract('2024-03-01T00:00:00Z', {
+        duration: { months: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-02-01T00:00:00Z')
+    })
+
+    test('should handle leap year correctly', () => {
+      const result = subtract('2024-02-29T00:00:00Z', {
+        duration: { years: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2023-02-28T00:00:00Z')
+    })
+
+    test('should handle negative duration (addition)', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { days: -1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-16T14:42:12.789Z')
+    })
+
+    test('should handle zero duration', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { days: 0 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-15T14:42:12.789Z')
+    })
+
+    test('should handle crossing year boundary', () => {
+      const result = subtract('2024-01-15T14:42:12.789Z', {
+        duration: { months: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2023-12-15T14:42:12.789Z')
+    })
+
+    test('should handle subtracting more than available', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { days: 100 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2023-12-06T14:42:12.789Z')
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date object', () => {
+      const date = new Date('2024-03-15T14:42:12.789Z')
+      const result = subtract(date, {
+        duration: { days: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-14T14:42:12.789Z')
+    })
+
+    test('should work with epoch time', () => {
+      const epoch = new Date('2024-03-15T14:42:12.789Z').getTime()
+      const result = subtract(epoch, {
+        duration: { days: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-14T14:42:12.789Z')
+    })
+
+    test('should work with ZonedDateTime', () => {
+      const zdt = Temporal.ZonedDateTime.from(
+        '2024-03-15T14:42:12.789Z[UTC][u-ca=gregory]',
+      )
+      const result = subtract(zdt, {
+        duration: { days: 1 },
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-14T14:42:12.789Z')
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { hours: 1 },
+        timeZone: 'America/New_York',
+      })
+      expect(result.options.timeZone).toBe('America/New_York')
+      expect(result.value).toContain('2024-03-15')
+    })
+
+    test('should return timezone in options', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { days: 1 },
+        timeZone: 'Asia/Tokyo',
+      })
+      expect(result.options.timeZone).toBe('Asia/Tokyo')
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const result = subtract('2024-03-15T14:42:12.789Z', {
+        duration: { days: 1 },
+        calendar: 'japanese',
+      })
+      expect(result.options.calendar).toBe('japanese')
+    })
+  })
+})
diff --git a/packages/time/src/date/types.ts b/packages/time/src/date/types.ts
new file mode 100644
index 00000000..e05be641
--- /dev/null
+++ b/packages/time/src/date/types.ts
@@ -0,0 +1,20 @@
+import type { Temporal } from '@js-temporal/polyfill'
+
+export type DateInput =
+  | string
+  | number
+  | Date
+  | Temporal.ZonedDateTime
+  | Temporal.PlainDate
+
+export interface DateOptions {
+  calendar?: string
+  timeZone?: string
+}
+
+export type DurationLike = Temporal.DurationLike
+
+export interface Range {
+  start: DateInput
+  end: DateInput
+}
diff --git a/packages/time/src/date/until/index.ts b/packages/time/src/date/until/index.ts
new file mode 100644
index 00000000..e6e9d6b3
--- /dev/null
+++ b/packages/time/src/date/until/index.ts
@@ -0,0 +1 @@
+export * from './until'
diff --git a/packages/time/src/date/until/tests/until.test.ts b/packages/time/src/date/until/tests/until.test.ts
new file mode 100644
index 00000000..2c6385ed
--- /dev/null
+++ b/packages/time/src/date/until/tests/until.test.ts
@@ -0,0 +1,238 @@
+import { describe, expect, test } from 'vitest'
+import { until } from '../until'
+
+describe('until', () => {
+  describe('with string inputs', () => {
+    test('should calculate duration in days', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'day',
+        },
+      )
+      expect(duration).toBe(1)
+    })
+
+    test('should calculate duration in hours', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T16:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'hour',
+        },
+      )
+      expect(duration).toBe(2)
+    })
+
+    test('should calculate duration in minutes', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:44:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'minute',
+        },
+      )
+      expect(duration).toBe(2)
+    })
+
+    test('should calculate duration in seconds', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:57.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'second',
+        },
+      )
+      expect(duration).toBe(45)
+    })
+
+    test('should calculate duration in milliseconds', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.889Z',
+        {
+          timeZone: 'UTC',
+          unit: 'millisecond',
+        },
+      )
+      expect(duration).toBe(100)
+    })
+
+    test('should calculate complex duration', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T17:12:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'day',
+        },
+      )
+      expect(duration).toBeCloseTo(1.104, 2)
+    })
+
+    test('should calculate duration in months', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2024-04-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'month',
+        },
+      )
+      expect(duration).toBe(1)
+    })
+
+    test('should calculate duration in years', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2025-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'year',
+        },
+      )
+      expect(duration).toBe(1)
+    })
+
+    test('should calculate duration in weeks', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-29T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'week',
+        },
+      )
+      expect(duration).toBe(2)
+    })
+  })
+
+  describe('with negative duration', () => {
+    test('should return negative duration when end is before start', () => {
+      const duration = until(
+        '2024-03-16T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'day',
+        },
+      )
+      expect(duration).toBe(-1)
+    })
+
+    test('should return zero duration when dates are equal', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-15T14:42:12.789Z',
+        {
+          timeZone: 'UTC',
+          unit: 'day',
+        },
+      )
+      expect(duration).toBe(0)
+    })
+  })
+
+  describe('edge cases', () => {
+    test('should handle month boundaries', () => {
+      const duration = until('2024-03-31T00:00:00Z', '2024-04-01T00:00:00Z', {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should handle year boundaries', () => {
+      const duration = until('2024-12-31T00:00:00Z', '2025-01-01T00:00:00Z', {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should handle leap years', () => {
+      const duration = until('2024-02-28T00:00:00Z', '2024-02-29T00:00:00Z', {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should handle non-leap years', () => {
+      const duration = until('2023-02-28T00:00:00Z', '2023-03-01T00:00:00Z', {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+  })
+
+  describe('with different input types', () => {
+    test('should work with Date objects', () => {
+      const start = new Date('2024-03-15T14:42:12.789Z')
+      const end = new Date('2024-03-16T14:42:12.789Z')
+      const duration = until(start, end, {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should work with epoch time', () => {
+      const start = new Date('2024-03-15T14:42:12.789Z').getTime()
+      const end = new Date('2024-03-16T14:42:12.789Z').getTime()
+      const duration = until(start, end, {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should work with mixed input types', () => {
+      const start = '2024-03-15T14:42:12.789Z'
+      const end = new Date('2024-03-16T14:42:12.789Z')
+      const duration = until(start, end, {
+        timeZone: 'UTC',
+        unit: 'day',
+      })
+      expect(duration).toBe(1)
+    })
+  })
+
+  describe('timezone handling', () => {
+    test('should respect timezone', () => {
+      const duration = until('2024-03-15T14:00:00Z', '2024-03-15T15:00:00Z', {
+        timeZone: 'America/New_York',
+        unit: 'hour',
+      })
+      expect(duration).toBe(1)
+    })
+
+    test('should handle different timezones correctly', () => {
+      const duration = until('2024-03-15T00:00:00Z', '2024-03-15T01:00:00Z', {
+        timeZone: 'UTC',
+        unit: 'hour',
+      })
+      expect(duration).toBe(1)
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should respect calendar', () => {
+      const duration = until(
+        '2024-03-15T14:42:12.789Z',
+        '2024-03-16T14:42:12.789Z',
+        {
+          calendar: 'japanese',
+          unit: 'day',
+        },
+      )
+      expect(duration).toBe(1)
+    })
+  })
+})
diff --git a/packages/time/src/date/until/until.ts b/packages/time/src/date/until/until.ts
new file mode 100644
index 00000000..29a563a9
--- /dev/null
+++ b/packages/time/src/date/until/until.ts
@@ -0,0 +1,29 @@
+import type { Temporal } from '@js-temporal/polyfill'
+import type { DateInput, DateOptions } from '../types'
+import { toZonedDateTime } from '~/date/helpers'
+import { getDateTimeDefaults } from '~/utils'
+
+export interface UntilOptions extends DateOptions {
+  unit: Temporal.DateTimeUnit
+}
+
+/**
+ * until
+ * Returns the duration from the first date/time instance until the second date/time instance
+ */
+export function until(start: DateInput, end: DateInput, options: UntilOptions) {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } = options
+
+  const startZdt = toZonedDateTime(start, timeZone, calendar)
+  const endZdt = toZonedDateTime(end, timeZone, calendar)
+
+  const duration = startZdt.until(endZdt)
+  const unit = options.unit
+
+  return duration.total({
+    unit,
+    relativeTo: startZdt,
+  })
+}
diff --git a/packages/time/src/date/validateDate.ts b/packages/time/src/date/validateDate.ts
new file mode 100644
index 00000000..b98df219
--- /dev/null
+++ b/packages/time/src/date/validateDate.ts
@@ -0,0 +1,27 @@
+import { isValidDate } from './isValidDate'
+import { parse as parser } from './parse'
+
+export interface ValidateDateOptions {
+  date: string | number | Date
+  parse?: (value: string | number | Date) => Date | undefined
+  errorMessage?: string
+}
+
+/**
+ * validateDate
+ * Verifies if a date is, or can be, a valid JS Date object
+ * @param {string | number | Date} date - a value that can be converted to a Date object
+ * @param {string} errorMessage - error message to throw if date is invalid
+ * @returns Date
+ */
+export function validateDate({
+  date,
+  parse = parser,
+  errorMessage = `Invalid Date: "${date}"`,
+}: ValidateDateOptions): Date {
+  const d = parse(date)
+  if (!isValidDate(d)) {
+    throw new Error(`${errorMessage}: "${date}"`)
+  }
+  return d
+}
diff --git a/packages/time/src/date/withDateOperation/index.ts b/packages/time/src/date/withDateOperation/index.ts
new file mode 100644
index 00000000..94e6b468
--- /dev/null
+++ b/packages/time/src/date/withDateOperation/index.ts
@@ -0,0 +1 @@
+export * from './withDateOperation'
diff --git a/packages/time/src/date/withDateOperation/withDateOperation.test.ts b/packages/time/src/date/withDateOperation/withDateOperation.test.ts
new file mode 100644
index 00000000..598b0c09
--- /dev/null
+++ b/packages/time/src/date/withDateOperation/withDateOperation.test.ts
@@ -0,0 +1,208 @@
+import { describe, expect, test } from 'vitest'
+import { Temporal } from '@js-temporal/polyfill'
+import { withDateOperation } from './withDateOperation'
+
+describe('withDateOperation', () => {
+  const mockOperation = withDateOperation((zdt, _args: { unit: string }) => zdt)
+
+  describe('timezone handling', () => {
+    test('should use default timezone when not provided', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', { unit: 'test' })
+      expect(result.options.timeZone).toBeDefined()
+      expect(typeof result.options.timeZone).toBe('string')
+    })
+
+    test('should use custom timezone', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'Asia/Tokyo',
+      })
+      expect(result.options.timeZone).toBe('Asia/Tokyo')
+    })
+
+    test('should return timezone in options', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'Europe/London',
+      })
+      expect(result.options.timeZone).toBe('Europe/London')
+    })
+  })
+
+  describe('calendar handling', () => {
+    test('should use default calendar when not provided', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', { unit: 'test' })
+      expect(result.options.calendar).toBeDefined()
+      expect(typeof result.options.calendar).toBe('string')
+    })
+
+    test('should use custom calendar', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        calendar: 'japanese',
+      })
+      expect(result.options.calendar).toBe('japanese')
+    })
+
+    test('should return calendar in options', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        calendar: 'islamic',
+      })
+      expect(result.options.calendar).toBe('islamic')
+    })
+  })
+
+  describe('conversion methods', () => {
+    test('should have asDate method', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'UTC',
+      })
+      const date = result.asDate()
+      expect(date).toBeInstanceOf(Date)
+      expect(date.toISOString()).toContain('2024-03-15')
+    })
+
+    test('should have asEpoch method', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'UTC',
+      })
+      const epoch = result.asEpoch()
+      expect(typeof epoch).toBe('number')
+      expect(new Date(epoch).toISOString()).toContain('2024-03-15')
+    })
+
+    test('should have asZonedDateTime method', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'UTC',
+      })
+      const zdt = result.asZonedDateTime()
+      expect(zdt).toBeInstanceOf(Temporal.ZonedDateTime)
+      expect(zdt.toInstant().toString()).toContain('2024-03-15')
+    })
+  })
+
+  describe('result properties', () => {
+    test('should have value property (defaults to string)', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'UTC',
+      })
+      expect(typeof result.value).toBe('string')
+      const valueStr = result.value
+      expect(valueStr).toContain('2024-03-15')
+    })
+
+    test('should have options property', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', { unit: 'test' })
+      expect(result.options).toHaveProperty('timeZone')
+      expect(result.options).toHaveProperty('calendar')
+      expect(typeof result.options.timeZone).toBe('string')
+      expect(typeof result.options.calendar).toBe('string')
+    })
+
+    test('should have timeZone property', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'Asia/Tokyo',
+      })
+      expect(result.timeZone).toBe('Asia/Tokyo')
+    })
+
+    test('should have calendar property', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        calendar: 'japanese',
+      })
+      expect(result.calendar).toBe('japanese')
+    })
+
+    test('should support destructuring', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'UTC',
+        calendar: 'gregory',
+      })
+      const { value, timeZone, calendar, returnFormat } = result
+      expect(typeof value).toBe('string')
+      expect(timeZone).toBe('UTC')
+      expect(calendar).toBe('gregory')
+      expect(returnFormat).toBe('standard')
+    })
+  })
+
+  describe('returnFormat', () => {
+    test('should default to standard format', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'UTC',
+      })
+      expect(result.returnFormat).toBe('standard')
+      expect(typeof result.value).toBe('string')
+      expect(result.value).toContain('2024-03-15')
+      expect(result.value).not.toContain('[')
+    })
+
+    test('should return standard format (RFC 3339 string)', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'UTC',
+        returnFormat: 'standard',
+      })
+      expect(result.returnFormat).toBe('standard')
+      expect(typeof result.value).toBe('string')
+      const valueStr = result.value
+      expect(valueStr).toContain('2024-03-15')
+      expect(valueStr).toMatch(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/)
+      expect(valueStr).not.toContain('[')
+    })
+
+    test('should return long format (with timezone and calendar)', () => {
+      const result = mockOperation('2024-03-15T14:42:12.789Z', {
+        unit: 'test',
+        timeZone: 'America/New_York',
+        calendar: 'gregory',
+        returnFormat: 'long',
+      })
+      expect(result.returnFormat).toBe('long')
+      expect(typeof result.value).toBe('string')
+      const valueStr = result.value
+      expect(valueStr).toContain('2024-03-15')
+      expect(valueStr).toContain('[America/New_York]')
+      expect(valueStr).toContain('[u-ca=gregory]')
+    })
+  })
+
+  describe('operation execution', () => {
+    test('should execute the provided operation function', () => {
+      const addDayOperation = withDateOperation(
+        (zdt, { days }: { days: number }) => {
+          return zdt.add({ days })
+        },
+      )
+      const result = addDayOperation('2024-03-15T00:00:00Z', {
+        days: 1,
+        timeZone: 'UTC',
+      })
+      expect(result.value).toBe('2024-03-16T00:00:00Z')
+    })
+
+    test('should pass args to the operation function', () => {
+      const customOperation = withDateOperation(
+        (zdt, { multiplier }: { multiplier: number }) => {
+          const days = zdt.day * multiplier
+          return zdt.with({ day: days })
+        },
+      )
+      const result = customOperation('2024-03-15T00:00:00Z', {
+        multiplier: 2,
+        timeZone: 'UTC',
+      })
+      const valueStr = result.value
+      expect(valueStr).toContain('2024-03-30')
+    })
+  })
+})
diff --git a/packages/time/src/date/withDateOperation/withDateOperation.ts b/packages/time/src/date/withDateOperation/withDateOperation.ts
new file mode 100644
index 00000000..a9f8de54
--- /dev/null
+++ b/packages/time/src/date/withDateOperation/withDateOperation.ts
@@ -0,0 +1,83 @@
+import type { Temporal } from '@js-temporal/polyfill'
+import type { DateInput, DateOptions } from '../types'
+import { getDateTimeDefaults } from '~/utils'
+import { toZonedDateTime } from '~/date/helpers'
+
+export type ReturnFormat = 'standard' | 'long'
+
+export interface DateOperationOptions extends DateOptions {
+  returnFormat?: ReturnFormat
+}
+
+export interface ResolvedDateOperationOptions {
+  timeZone: string
+  calendar: string
+  returnFormat: ReturnFormat
+}
+
+export function resolveOptions(
+  options: DateOperationOptions,
+): ResolvedDateOperationOptions {
+  const { timeZone: defaultTimeZone, calendar: defaultCalendar } =
+    getDateTimeDefaults()
+  const { timeZone = defaultTimeZone, calendar = defaultCalendar } = options
+  return {
+    timeZone,
+    calendar,
+    returnFormat: options.returnFormat ?? 'standard',
+  }
+}
+
+export function createDateOperationResult(
+  zdt: Temporal.ZonedDateTime,
+  options: ResolvedDateOperationOptions,
+) {
+  const { returnFormat } = options
+  const getValue = (): string => {
+    switch (returnFormat) {
+      case 'standard':
+        return zdt.toInstant().toString()
+      case 'long':
+        return `${zdt.toInstant().toString()}[${zdt.timeZoneId}][u-ca=${zdt.calendarId}]`
+      default:
+        return zdt.toInstant().toString()
+    }
+  }
+
+  return {
+    value: getValue(),
+    options,
+    returnFormat,
+    asDate: () => {
+      return new Date(Number(zdt.epochNanoseconds / 1_000_000n))
+    },
+    asEpoch: () => {
+      return Number(zdt.epochNanoseconds / 1_000_000n)
+    },
+    asZonedDateTime: () => {
+      return zdt
+    },
+    timeZone: options.timeZone,
+    calendar: options.calendar,
+  }
+}
+
+/**
+ * Higher-order function that provides common parsing, defaults, and formatting logic
+ * for date utility functions like startOf, endOf, etc.
+ */
+export function withDateOperation<TArgs>(
+  fn: (zdt: Temporal.ZonedDateTime, args: TArgs) => Temporal.ZonedDateTime,
+) {
+  return (input: DateInput, options: DateOperationOptions & TArgs) => {
+    const resolved = resolveOptions(options)
+    const inputZdt = toZonedDateTime(
+      input,
+      resolved.timeZone,
+      resolved.calendar,
+    )
+    const resultZdt = fn(inputZdt, options)
+
+    return createDateOperationResult(resultZdt, resolved)
+  }
+}
diff --git a/packages/time/src/formatter/buildDateFormatter/buildDateFormatter.ts b/packages/time/src/formatter/buildDateFormatter/buildDateFormatter.ts
new file mode 100644
index 00000000..b62ee931
--- /dev/null
+++ b/packages/time/src/formatter/buildDateFormatter/buildDateFormatter.ts
@@ -0,0 +1,41 @@
+import type { DateFormatterBuildParams, DateFormatterOptions } from '../shared'
+import { normalizeLocale } from '~/date/helpers'
+import { getDateTimeDefaults } from '~/utils'
+import { extractLocaleOptions } from '~/formatter/extractLocaleOptions'
+
+/**
+ * Function: buildDateFormatter
+ * This function is used to build a date only formatter, using the Intl.DateTimeFormat constructor.
+ * The 'locale' named parameter can be a string, an Intl.Locale object, or an array of strings
+ * or Intl.Locale objects. This is defaulted to the user's browser locale.
+ *
+ * The 'options' named parameter can be a string or an object.
+ *
+ * If 'options' is a string, it will be used as the 'dateStyle' option.
+ *  See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat#datestyle as reference.
+ *
+ * If 'options' is an object, it will use the Intl.DateTimeFormat 'options'.
+ *  See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat#options as reference.
+ *
+ * You use the 'options' object for finer level of control over the date formatting.
+ * When using UTC date strings, it is suggested that you use the 'options' object
+ * to set the 'timeZone' when building the formatter. The 'timeZone' is defaulted
+ * to the user's browser timezone.
+ * @param {DateFormatterBuildParams} [param0]
+ * @returns Intl.DateTimeFormat
+ */
+export function buildDateFormatter({
+  locale = getDateTimeDefaults().locale,
+  options,
+}: DateFormatterBuildParams): Intl.DateTimeFormat {
+  const normalizedLocale = normalizeLocale(locale)
+  const opts =
+    typeof options === 'string' ? { dateStyle: options } : (options ?? {})
+  const { formatOptions = {}, ...localeOptions } = extractLocaleOptions(opts)
+  const { dateStyle, ...rest } = formatOptions as DateFormatterOptions
+  const newOptions = {
+    ...localeOptions,
+    ...(dateStyle ? { dateStyle } : rest),
+  }
+  return new Intl.DateTimeFormat(normalizedLocale, newOptions)
+}
diff --git a/packages/time/src/formatter/buildDateFormatter/index.ts b/packages/time/src/formatter/buildDateFormatter/index.ts
new file mode 100644
index 00000000..c6394c6c
--- /dev/null
+++ b/packages/time/src/formatter/buildDateFormatter/index.ts
@@ -0,0 +1 @@
+export * from './buildDateFormatter'
diff --git a/packages/time/src/formatter/buildDateTimeFormatter/buildDateTimeFormatter.ts b/packages/time/src/formatter/buildDateTimeFormatter/buildDateTimeFormatter.ts
new file mode 100644
index 00000000..0352296e
--- /dev/null
+++ b/packages/time/src/formatter/buildDateTimeFormatter/buildDateTimeFormatter.ts
@@ -0,0 +1,55 @@
+import type {
+  DateTimeFormatterBuildParams,
+  DateTimeFormatterOptions,
+} from '../shared'
+import { getDateTimeDefaults } from '~/utils'
+import { normalizeLocale } from '~/date/helpers'
+import { extractLocaleOptions } from '~/formatter/extractLocaleOptions'
+
+/**
+ * @typedef {string | Intl.Locale | string[] | Intl.Locale[]} Locale
+ *
+ * @typedef {Object} DateTimeFormatterOptions
+ * @property {Locale} [locale]
+ * @property {string | DateFormatterOptions} [options]
+ */
+
+/**
+ * Function: buildDateTimeFormatter
+ * This function is used to build a date and time formatter, using the Intl.DateTimeFormat constructor.
+ * The 'locale' named parameter can be a string, an Intl.Locale object, or an array of strings
+ * or Intl.Locale objects. This is defaulted to the user's browser locale.
+ *
+ * The 'options' named parameter can be a string or an object.
+ *
+ * If 'options' is a string, it will be used as the 'dateStyle' and 'timeStyle' options.
+ *  See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat#datestyle and https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat#timestyle as reference.
+ *
+ * If 'options' is an object, it will use the Intl.DateTimeFormat 'options'.
+ *  See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat#options as reference.
+ *
+ * You use the 'options' object for finer level of control over the time formatting.
+ * When using UTC date strings, it is suggested that you use the 'options' object
+ * to set the 'timeZone' when building the formatter. The 'timeZone' is defaulted
+ * to the user's browser timezone.
+ * @param {DateTimeFormatterBuildParams} [param0]
+ * @returns Intl.DateTimeFormat
+ */
+export function buildDateTimeFormatter({
+  locale = getDateTimeDefaults().locale,
+  options,
+}: DateTimeFormatterBuildParams): Intl.DateTimeFormat {
+  const normalizedLocale = normalizeLocale(locale)
+  const opts =
+    typeof options === 'string'
+      ? { dateStyle: options, timeStyle: options }
+      : (options ?? {})
+  const { formatOptions = {}, ...localeOptions } = extractLocaleOptions(opts)
+  const { dateStyle, timeStyle, ...rest } =
+    formatOptions as DateTimeFormatterOptions
+  const newOptions = {
+    ...localeOptions,
+    ...(dateStyle && timeStyle ? { dateStyle, timeStyle } : rest),
+  }
+  return new Intl.DateTimeFormat(normalizedLocale, newOptions)
+}
diff --git a/packages/time/src/formatter/buildDateTimeFormatter/index.ts b/packages/time/src/formatter/buildDateTimeFormatter/index.ts
new file mode 100644
index 00000000..e178416c
--- /dev/null
+++ b/packages/time/src/formatter/buildDateTimeFormatter/index.ts
@@ -0,0 +1 @@
+export * from './buildDateTimeFormatter'
diff --git a/packages/time/src/formatter/buildFinalFormatter/buildFinalFormatter.ts b/packages/time/src/formatter/buildFinalFormatter/buildFinalFormatter.ts
new file mode 100644
index 00000000..d843b6bd
--- /dev/null
+++ b/packages/time/src/formatter/buildFinalFormatter/buildFinalFormatter.ts
@@ -0,0 +1,45 @@
+import { validateDate } from '../../date/validateDate'
+import { parse as parser } from '../../date/parse'
+
+export interface BuildFinalFormatterOptions {
+  formatter: Intl.DateTimeFormat
+  formatterName: string
+  parse?: (value: string | number | Date) => Date | undefined
+  forRange?: boolean
+}
+
+/**
+ * buildFinalFormatter - takes an Intl.DateTimeFormat object and returns a
+ * basic format function. When calling the format function, it will validate
+ * the given input date(s) and return the formatted date string.
+ */
+export function buildFinalFormatter({
+  formatter,
+  formatterName,
+  parse = parser,
+  forRange = false,
+}: BuildFinalFormatterOptions): (
+  date: string | number | Date,
+  date2?: string | number | Date,
+) => string {
+  return (
+    date: string | number | Date,
+    date2?: string | number | Date,
+  ): string => {
+    if (!date) return ''
+    const trueDate = validateDate({
+      date,
+      parse,
+      errorMessage: `[${formatterName}] date "${date}" is Invalid.`,
+    })
+    if (!forRange || !date2) {
+      return formatter.format(trueDate)
+    }
+    const endDate = validateDate({
+      date: date2,
+      parse,
+      errorMessage: `[${formatterName}] second date "${date2}" is Invalid.`,
+    })
+    return formatter.formatRange(trueDate, endDate)
+  }
+}
diff --git a/packages/time/src/formatter/buildFinalFormatter/index.ts b/packages/time/src/formatter/buildFinalFormatter/index.ts
new file mode 100644
index 00000000..be621692
--- /dev/null
+++ b/packages/time/src/formatter/buildFinalFormatter/index.ts
@@ -0,0 +1 @@
+export * from './buildFinalFormatter'
diff --git a/packages/time/src/formatter/buildFinalFormatter/tests/buildFinalFormatter.test.ts b/packages/time/src/formatter/buildFinalFormatter/tests/buildFinalFormatter.test.ts
new file mode 100644
index 00000000..5b91c204
--- /dev/null
+++ b/packages/time/src/formatter/buildFinalFormatter/tests/buildFinalFormatter.test.ts
@@ -0,0 +1,49 @@
+import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest'
+import { buildFinalFormatter } from '../buildFinalFormatter'
+
+const dateTimeFormat = new Intl.DateTimeFormat('en-US', {
+  year: 'numeric',
+  month: '2-digit',
+  day: '2-digit',
+  hour: '2-digit',
+  minute: '2-digit',
+  second: '2-digit',
+  timeZoneName: 'short',
+  timeZone: 'America/New_York',
+})
+
+const timeOnlyFormat = new Intl.DateTimeFormat('en-US', {
+  hour: '2-digit',
+  minute: '2-digit',
+  timeZone: 'America/New_York',
+})
+
+describe('buildFinalFormatter', () => {
+  beforeEach(() => {
+    vi.stubEnv('TZ', 'America/New_York')
+  })
+
+  afterEach(() => {
+    vi.unstubAllEnvs()
+  })
+
+  test('should format a date string', () => {
+    const format = buildFinalFormatter({
+      formatter: dateTimeFormat,
+      formatterName: 'dateTimeFormat',
+    })
+    expect(format('2021-03-12T14:42')).toBe('03/12/2021, 02:42:00 PM EST')
+  })
+
+  test('should format a time string range', () => {
+    const timeFormat = buildFinalFormatter({
+      formatter: timeOnlyFormat,
+      formatterName: 'timeOnlyFormat',
+      forRange: true,
+    })
+    // output does not show 2-digit hour in range due to a bug in Intl.DateTimeFormat.formatRange
+    expect(timeFormat('2021-03-12T14:42', '2021-03-12T15:42')).toBe(
+      '2:42 – 3:42 PM',
+    )
+  })
+})
diff --git a/packages/time/src/formatter/buildTimeFormatter/buildTimeFormatter.ts b/packages/time/src/formatter/buildTimeFormatter/buildTimeFormatter.ts
new file mode 100644
index 00000000..ec0f7a68
--- /dev/null
+++ b/packages/time/src/formatter/buildTimeFormatter/buildTimeFormatter.ts
@@ -0,0 +1,41 @@
+import type { TimeFormatterBuildParams, TimeFormatterOptions } from '../shared'
+import { getDateTimeDefaults } from '~/utils'
+import { normalizeLocale } from '~/date/helpers'
+import { extractLocaleOptions } from '~/formatter/extractLocaleOptions'
+
+/**
+ * Function: buildTimeFormatter
+ * This function is used to build a time only formatter, using the Intl.DateTimeFormat constructor.
+ * The 'locale' named parameter can be a string, an Intl.Locale object, or an array of strings
+ * or Intl.Locale objects. This is defaulted to the user's browser locale.
+ *
+ * The 'options' named parameter can be a string or an object.
+ *
+ * If 'options' is a string, it will be used as the 'timeStyle' option.
+ *  See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat#timestyle as reference.
+ *
+ * If 'options' is an object, it will use the Intl.DateTimeFormat 'options'.
+ *  See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat#options as reference.
+ *
+ * You use the 'options' object for finer level of control over the time formatting.
+ * When using UTC date strings, it is suggested that you use the 'options' object
+ * to set the 'timeZone' when building the formatter. The 'timeZone' is defaulted
+ * to the user's browser timezone.
+ * @param {TimeFormatterBuildParams} [param0]
+ * @returns Intl.DateTimeFormat
+ */
+export function buildTimeFormatter({
+  locale = getDateTimeDefaults().locale,
+  options,
+}: TimeFormatterBuildParams): Intl.DateTimeFormat {
+  const normalizedLocale = normalizeLocale(locale)
+  const opts =
+    typeof options === 'string' ? { dateStyle: options } : (options ?? {})
+  const { formatOptions = {}, ...localeOptions } = extractLocaleOptions(opts)
+  const { timeStyle, ...rest } = formatOptions as TimeFormatterOptions
+  const newOptions = {
+    ...localeOptions,
+    ...(timeStyle ? { timeStyle } : rest),
+  }
+  return new Intl.DateTimeFormat(normalizedLocale, newOptions)
+}
diff --git a/packages/time/src/formatter/buildTimeFormatter/index.ts b/packages/time/src/formatter/buildTimeFormatter/index.ts
new file mode 100644
index 00000000..2d212871
--- /dev/null
+++ b/packages/time/src/formatter/buildTimeFormatter/index.ts
@@ -0,0 +1 @@
+export * from './buildTimeFormatter'
diff --git a/packages/time/src/formatter/extractLocaleOptions.ts b/packages/time/src/formatter/extractLocaleOptions.ts
new file mode 100644
index 00000000..037a7fff
--- /dev/null
+++ b/packages/time/src/formatter/extractLocaleOptions.ts
@@ -0,0 +1,91 @@
+import type {
+  DateFormatterOptions,
+  DateTimeFormatterOptions,
+  TimeFormatterOptions,
+} from './shared'
+import { getDateTimeDefaults } from '~/utils'
+
+/**
+ * @typedef {Object} DateFormatterOptions
+ * @property {string} [localeMatcher]
+ * @property {string} [calendar]
+ * @property {string} [numberingSystem]
+ * @property {boolean} [hour12]
+ * @property {string} [hourCycle]
+ * @property {string} [timeZone]
+ * @property {string} [formatMatcher]
+ * @property {string} [weekday]
+ * @property {string} [era]
+ * @property {string} [year]
+ * @property {string} [month]
+ * @property {string} [day]
+ * @property {string} [dateStyle]
+ *
+ * @typedef {Object} TimeFormatterOptions
+ * @property {string} [localeMatcher]
+ * @property {string} [calendar]
+ * @property {string} [numberingSystem]
+ * @property {boolean} [hour12]
+ * @property {string} [hourCycle]
+ * @property {string} [timeZone]
+ * @property {string} [formatMatcher]
+ * @property {string} [dayPeriod]
+ * @property {string} [hour]
+ * @property {string} [minute]
+ * @property {string} [second]
+ * @property {number} [fractionalSecondDigits]
+ * @property {string} [timeZoneName]
+ * @property {string} [timeStyle]
+ *
+ * @typedef {Object} DateTimeFormatterOptions
+ * @property {string} [localeMatcher]
+ * @property {string} [calendar]
+ * @property {string} [numberingSystem]
+ * @property {boolean} [hour12]
+ * @property {string} [hourCycle]
+ * @property {string} [timeZone]
+ * @property {string} [formatMatcher]
+ * @property {string} [weekday]
+ * @property {string} [era]
+ * @property {string} [year]
+ * @property {string} [month]
+ * @property {string} [day]
+ * @property {string} [dateStyle]
+ * @property {string} [dayPeriod]
+ * @property {string} [hour]
+ * @property {string} [minute]
+ * @property {string} [second]
+ * @property {number} [fractionalSecondDigits]
+ * @property {string} [timeZoneName]
+ * @property {string} [timeStyle]
+ */
+
+/**
+ * Function: extractLocaleOptions
+ * This function is used to extract the locale options from the 'options' parameter of the various
+ * formatter 'build' functions.
+ *
+ * If 'calender' or 'timeZone' are not provided, the default values provided by the
+ * Intl.DateTimeFormat().resolvedOptions() are used.
+ * @param {DateFormatterOptions | DateTimeFormatterOptions | TimeFormatterOptions} param0
+ * @returns
+ */
+export function extractLocaleOptions({
+  localeMatcher,
+  calendar = getDateTimeDefaults().calendar,
+  timeZone = getDateTimeDefaults().timeZone,
+  numberingSystem,
+  hour12,
+  hourCycle,
+  ...formatOptions
+}: DateFormatterOptions | DateTimeFormatterOptions | TimeFormatterOptions) {
+  return {
+    localeMatcher,
+    calendar,
+    numberingSystem,
+    hour12,
+    hourCycle,
+    timeZone,
+    formatOptions,
+  }
+}
diff --git a/packages/time/src/formatter/shared.ts b/packages/time/src/formatter/shared.ts
new file mode 100644
index 00000000..70a7c4c7
--- /dev/null
+++ b/packages/time/src/formatter/shared.ts
@@ -0,0 +1,59 @@
+export interface LocaleFormatterOptions {
+  localeMatcher?: 'lookup' | 'best fit'
+  calendar?: string
+  numberingSystem?: string
+  hour12?: boolean
+  hourCycle?: 'h11' | 'h12' | 'h23' | 'h24'
+  timeZone?: string
+}
+
+type FormatStyle = 'full' | 'long' | 'medium' | 'short'
+
+export type Locale = string | Intl.Locale | Array<string> | Array<Intl.Locale>
+
+export interface DateFormatterOptions extends LocaleFormatterOptions {
+  formatMatcher?: 'basic' | 'best fit'
+  weekday?: 'narrow' | 'short' | 'long'
+  era?: 'narrow' | 'short' | 'long'
+  year?: '2-digit' | 'numeric'
+  month?: '2-digit' | 'numeric' | 'narrow' | 'short' | 'long'
+  day?: '2-digit' | 'numeric'
+  // style shortcuts
+  dateStyle?: FormatStyle
+}
+
+export interface TimeFormatterOptions extends LocaleFormatterOptions {
+  formatMatcher?: 'basic' | 'best fit'
+  dayPeriod?: 'narrow' | 'short' | 'long'
+  hour?: '2-digit' | 'numeric'
+  minute?: '2-digit' | 'numeric'
+  second?: '2-digit' | 'numeric'
+  fractionalSecondDigits?: 1 | 2 | 3
+  timeZoneName?:
+    | 'short'
+    | 'long'
+    | 'shortOffset'
+    | 'longOffset'
+    | 'shortGeneric'
+    | 'longGeneric'
+  // style shortcuts
+  timeStyle?: FormatStyle
+}
+
+export interface DateTimeFormatterOptions
+  extends DateFormatterOptions, TimeFormatterOptions {}
+
+export interface DateFormatterBuildParams {
+  locale?: Locale
+  options?: FormatStyle | DateFormatterOptions
+}
+
+export interface TimeFormatterBuildParams {
+  locale?: Locale
+  options?: FormatStyle | TimeFormatterOptions
+}
+
+export interface DateTimeFormatterBuildParams {
+  locale?: Locale
+  options?: FormatStyle | DateTimeFormatterOptions
+}
diff --git a/packages/time/src/index.ts b/packages/time/src/index.ts
new file mode 100644
index 00000000..d7284f31
--- /dev/null
+++ b/packages/time/src/index.ts
@@ -0,0 +1,3 @@
+export * from './date'
+export * from './calendar'
+export * from './client'
diff --git a/packages/time/src/polyfills/getWeekInfo.ts b/packages/time/src/polyfills/getWeekInfo.ts
new file mode 100644
index 00000000..a63d0cb9
--- /dev/null
+++ b/packages/time/src/polyfills/getWeekInfo.ts
@@ -0,0 +1,62 @@
+import { getDateTimeDefaults } from '../utils/dateTimeDefaults'
+import { weekInfoData } from './weekInfoData'
+import type { WeekInfo } from './types'
+
+const normalizeLocale = (loc: string) => {
+  const [lang, region] = loc.split('-')
+  return region
+    ? `${lang?.toLowerCase()}-${region.toUpperCase()}`
+    : lang?.toLowerCase()
+}
+
+const DEFAULT_WEEK_INFO: WeekInfo = {
+  firstDay: 7,
+  weekend: [6, 7],
+  minimalDays: 1,
+}
+
+function lookupWeekInfo(localeString: string): WeekInfo {
+  const normalizedLocale = normalizeLocale(localeString)
+
+  let match: WeekInfo | undefined = weekInfoData[normalizedLocale ?? '']
+
+  if (!match) {
+    const mainLanguage = normalizedLocale?.split('-')[0]
+    match = weekInfoData[mainLanguage ?? '']
+  }
+
+  if (!match) {
+    match = Object.entries(weekInfoData).find(
+      ([key]) => normalizeLocale(key) === normalizedLocale,
+    )?.[1]
+  }
+
+  if (!match) {
+    match = weekInfoData.en ?? weekInfoData['en-US'] ?? DEFAULT_WEEK_INFO
+  }
+
+  return match
+}
+
+export function getWeekInfo(locale?: string | Intl.Locale): WeekInfo {
+  const localeString =
+    locale == null
+      ? getDateTimeDefaults().locale
+      : typeof locale === 'string'
+        ? locale
+        : locale.toString()
+  return lookupWeekInfo(localeString)
+}
+
+if (typeof Intl !== 'undefined') {
+  const { prototype } = Intl.Locale
+  if ('weekInfo' in prototype && typeof prototype.getWeekInfo !== 'function') {
+    prototype.getWeekInfo = function () {
+      return this.weekInfo
+    }
+  } else if (typeof prototype.getWeekInfo !== 'function') {
+    prototype.getWeekInfo = function () {
+      return lookupWeekInfo(this.toString())
+    }
+  }
+}
diff --git a/packages/time/src/polyfills/types.ts b/packages/time/src/polyfills/types.ts
new file mode 100644
index 00000000..0f9a20a1
--- /dev/null
+++ b/packages/time/src/polyfills/types.ts
@@ -0,0 +1,15 @@
+export interface WeekInfo {
+  firstDay: number
+  weekend: Array<number>
+  minimalDays: number
+}
+
+declare global {
+  // eslint-disable-next-line @typescript-eslint/no-namespace
+  namespace Intl {
+    interface Locale {
+      getWeekInfo: () => WeekInfo
+      weekInfo?: WeekInfo
+    }
+  }
+}
diff --git a/packages/time/src/polyfills/weekInfoData.ts b/packages/time/src/polyfills/weekInfoData.ts
new file mode 100644
index 00000000..39d39de6
--- /dev/null
+++ b/packages/time/src/polyfills/weekInfoData.ts
@@ -0,0 +1,714 @@
+import type { WeekInfo } from './types'
+
+export const weekInfoData: Record<string, WeekInfo> = {
+  aa: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'aa-DJ': { firstDay: 6, weekend: [6, 7], minimalDays: 1 },
+  'aa-ER': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  ab: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  af: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'af-NA': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  agq: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  ak: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  am: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  an: { firstDay: 1, weekend: [6, 7], minimalDays: 4 },
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+  'sw-CD': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'sw-KE': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'sw-UG': { firstDay: 1, weekend: [7], minimalDays: 1 },
+  syr: { firstDay: 6, weekend: [5, 6], minimalDays: 1 },
+  'syr-SY': { firstDay: 6, weekend: [5, 6], minimalDays: 1 },
+  szl: { firstDay: 1, weekend: [6, 7], minimalDays: 4 },
+  ta: { firstDay: 7, weekend: [7], minimalDays: 1 },
+  'ta-LK': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'ta-MY': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'ta-SG': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  te: { firstDay: 7, weekend: [7], minimalDays: 1 },
+  teo: { firstDay: 1, weekend: [7], minimalDays: 1 },
+  'teo-KE': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  tg: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  th: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  ti: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'ti-ER': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  tig: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  tk: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  tn: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'tn-BW': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  to: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  tok: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  tpi: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  tr: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'tr-CY': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  trv: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  trw: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  ts: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  tt: { firstDay: 1, weekend: [6, 7], minimalDays: 4 },
+  twq: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  tyv: { firstDay: 1, weekend: [6, 7], minimalDays: 4 },
+  tzm: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  ug: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  uk: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  und: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  ur: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'ur-IN': { firstDay: 7, weekend: [7], minimalDays: 1 },
+  uz: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'uz-Arab': { firstDay: 6, weekend: [4, 5], minimalDays: 1 },
+  'uz-Cyrl': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'uz-Latn': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  vai: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'vai-Latn': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'vai-Vaii': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  ve: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  vec: { firstDay: 1, weekend: [6, 7], minimalDays: 4 },
+  vi: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  vmw: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  vo: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  vun: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  wa: { firstDay: 1, weekend: [6, 7], minimalDays: 4 },
+  wae: { firstDay: 1, weekend: [6, 7], minimalDays: 4 },
+  wal: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  wbp: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  wo: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  xh: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  xnr: { firstDay: 7, weekend: [7], minimalDays: 1 },
+  xog: { firstDay: 1, weekend: [7], minimalDays: 1 },
+  yav: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  yi: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  yo: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'yo-BJ': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  yrl: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'yrl-CO': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'yrl-VE': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  yue: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'yue-Hans': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'yue-Hant': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  za: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  zgh: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  zh: { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'zh-Hans': { firstDay: 1, weekend: [6, 7], minimalDays: 1 },
+  'zh-Hans-HK': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'zh-Hans-MO': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'zh-Hans-SG': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'zh-Hant': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'zh-Hant-HK': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  'zh-Hant-MO': { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+  zu: { firstDay: 7, weekend: [6, 7], minimalDays: 1 },
+}
diff --git a/packages/time/src/utils/dateDefaults.ts b/packages/time/src/utils/dateDefaults.ts
new file mode 100644
index 00000000..b9c252f8
--- /dev/null
+++ b/packages/time/src/utils/dateDefaults.ts
@@ -0,0 +1 @@
+export * from '~/utils/dateTimeDefaults'
diff --git a/packages/time/src/utils/dateRange.ts b/packages/time/src/utils/dateRange.ts
new file mode 100644
index 00000000..6361964e
--- /dev/null
+++ b/packages/time/src/utils/dateRange.ts
@@ -0,0 +1,96 @@
+import { Temporal } from '@js-temporal/polyfill'
+import type { DateInput } from '../date/types'
+import type { DateRange } from '../calendar/types'
+
+export interface ParsedDateRange {
+  start: Temporal.PlainDate | null
+  end: Temporal.PlainDate | null
+}
+
+function toPlainDate(
+  input: DateInput,
+  calendar: Temporal.CalendarLike,
+): Temporal.PlainDate {
+  if (input instanceof Temporal.PlainDate) {
+    return input.withCalendar(calendar)
+  }
+  if (input instanceof Temporal.ZonedDateTime) {
+    return input.toPlainDate().withCalendar(calendar)
+  }
+  if (input instanceof Date) {
+    return Temporal.PlainDate.from({
+      year: input.getFullYear(),
+      month: input.getMonth() + 1,
+      day: input.getDate(),
+    }).withCalendar(calendar)
+  }
+  if (typeof input === 'number') {
+    const date = new Date(input)
+    return Temporal.PlainDate.from({
+      year: date.getFullYear(),
+      month: date.getMonth() + 1,
+      day: date.getDate(),
+    }).withCalendar(calendar)
+  }
+  return Temporal.PlainDate.from(input).withCalendar(calendar)
+}
+
+export interface ParseDateRangeOptions {
+  range?: DateRange
+  calendar: Temporal.CalendarLike
+}
+
+export function parseDateRange({
+  range,
+  calendar,
+}: ParseDateRangeOptions): ParsedDateRange {
+  if (!range) {
+    return { start: null, end: null }
+  }
+
+  return {
+    start: range.start ? toPlainDate(range.start, calendar) : null,
+    end: range.end ? toPlainDate(range.end, calendar) : null,
+  }
+}
+
+export interface IsDateInRangeOptions {
+  date: Temporal.PlainDate
+  range: ParsedDateRange
+}
+
+export function isDateInRange({ date, range }: IsDateInRangeOptions): boolean {
+  const { start, end } = range
+
+  if (start && Temporal.PlainDate.compare(date, start) < 0) {
+    return false
+  }
+
+  if (end && Temporal.PlainDate.compare(date, end) > 0) {
+    return false
+  }
+
+  return true
+}
+
+export interface ConstrainDateToRangeOptions {
+  date: Temporal.PlainDate
+  range: ParsedDateRange
+}
+
+export function constrainDateToRange({
+  date,
+  range,
+}: ConstrainDateToRangeOptions): Temporal.PlainDate {
+  const { start, end } = range
+
+  if (start && Temporal.PlainDate.compare(date, start) < 0) {
+    return start
+  }
+
+  if (end && Temporal.PlainDate.compare(date, end) > 0) {
+    return end
+  }
+
+  return date
+}
diff --git a/packages/time/src/utils/dateTimeDefaults.ts b/packages/time/src/utils/dateTimeDefaults.ts
new file mode 100644
index 00000000..9246e18f
--- /dev/null
+++ b/packages/time/src/utils/dateTimeDefaults.ts
@@ -0,0 +1,5 @@
+const defaults = new Intl.DateTimeFormat().resolvedOptions()
+
+export function getDateTimeDefaults() {
+  return defaults
+}
diff --git a/packages/time/src/utils/index.ts b/packages/time/src/utils/index.ts
new file mode 100644
index 00000000..83e45017
--- /dev/null
+++ b/packages/time/src/utils/index.ts
@@ -0,0 +1,3 @@
+export * from './dateRange'
+export * from './weekUtils'
+export * from './dateTimeDefaults'
diff --git a/packages/time/src/utils/weekUtils.ts b/packages/time/src/utils/weekUtils.ts
new file mode 100644
index 00000000..7bd05cc5
--- /dev/null
+++ b/packages/time/src/utils/weekUtils.ts
@@ -0,0 +1,29 @@
+import { Temporal } from '@js-temporal/polyfill'
+import { getWeekInfo } from '../polyfills/getWeekInfo'
+
+/**
+ * Get the first day of the month for a given year-month string
+ */
+export function getFirstDayOfMonth(yearMonth: string): Temporal.PlainDate {
+  const [year, month] = yearMonth.split('-').map(Number)
+  if (!year || !month) {
+    throw new Error(`Invalid yearMonth format: ${yearMonth}. Expected YYYY-MM`)
+  }
+  return Temporal.PlainDate.from({ year, month, day: 1 })
+}
+
+/**
+ * Get the first day of the week for a given date string and locale
+ */
+export function getFirstDayOfWeek(
+  dateString: string,
+  locale: string,
+): Temporal.PlainDate {
+  const date = Temporal.PlainDate.from(dateString)
+  const weekInfo = getWeekInfo(locale)
+  const firstDayOfWeek = weekInfo.firstDay
+  const dayOfWeek = date.dayOfWeek
+  const daysToSubtract = (dayOfWeek - firstDayOfWeek + 7) % 7
+
+  return date.subtract({ days: daysToSubtract })
+}
diff --git a/packages/time/tsconfig.docs.json b/packages/time/tsconfig.docs.json
new file mode 100644
index 00000000..2880b4df
--- /dev/null
+++ b/packages/time/tsconfig.docs.json
@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["tests", "src"]
+}
diff --git a/packages/time/tsconfig.json b/packages/time/tsconfig.json
new file mode 100644
index 00000000..e4e46a73
--- /dev/null
+++ b/packages/time/tsconfig.json
@@ -0,0 +1,11 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["src", "vite.config.ts", "vitest.config.ts", "tests"],
+  "exclude": ["eslint.config.js"],
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "~/*": ["./src/*"]
+    }
+  }
+}
diff --git a/packages/time/tsdown.config.ts b/packages/time/tsdown.config.ts
new file mode 100644
index 00000000..71071cb9
--- /dev/null
+++ b/packages/time/tsdown.config.ts
@@ -0,0 +1,16 @@
+import { defineConfig } from 'tsdown'
+
+export default defineConfig({
+  entry: ['./src/index.ts'],
+  format: ['esm', 'cjs'],
+  unbundle: true,
+  dts: true,
+  sourcemap: true,
+  clean: true,
+  minify: false,
+  fixedExtension: false,
+  exports: true,
+  publint: {
+    strict: true,
+  },
+})
diff --git a/packages/time/vitest.config.ts b/packages/time/vitest.config.ts
new file mode 100644
index 00000000..18a3b069
--- /dev/null
+++ b/packages/time/vitest.config.ts
@@ -0,0 +1,18 @@
+import { fileURLToPath } from 'node:url'
+import { defineConfig } from 'vitest/config'
+import tsconfigPaths from 'vite-tsconfig-paths'
+import packageJson from './package.json' with { type: 'json' }
+
+const packageDir = fileURLToPath(new URL('.', import.meta.url))
+
+export default defineConfig({
+  plugins: [tsconfigPaths({ root: packageDir })],
+  test: {
+    name: packageJson.name,
+    include: ['src/**/*.test.ts', 'src/**/*.spec.ts'],
+    dir: './',
+    watch: false,
+    environment: 'happy-dom',
+    globals: true,
+  },
+})
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
new file mode 100644
index 00000000..3e25f1cf
--- /dev/null
+++ b/pnpm-lock.yaml
@@ -0,0 +1,10386 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+overrides:
+  '@tanstack/time': workspace:*
+  '@tanstack/time-devtools': workspace:*
+  '@tanstack/react-time': workspace:*
+  '@tanstack/react-time-devtools': workspace:*
+  '@tanstack/solid-time': workspace:*
+  '@tanstack/solid-time-devtools': workspace:*
+
+importers:
+
+  .:
+    dependencies:
+      '@js-temporal/polyfill':
+        specifier: ^0.5.1
+        version: 0.5.1
+    devDependencies:
+      '@changesets/changelog-github':
+        specifier: ^0.7.0
+        version: 0.7.0
+      '@changesets/cli':
+        specifier: ^2.29.8
+        version: 2.29.8(@types/node@25.2.2)
+      '@faker-js/faker':
+        specifier: ^10.2.0
+        version: 10.3.0
+      '@tanstack/eslint-config':
+        specifier: 0.3.4
+        version: 0.3.4(@typescript-eslint/utils@8.55.0(eslint@9.39.2(jiti@2.6.1))(typescript@5.9.3))(eslint@9.39.2(jiti@2.6.1))(typescript@5.9.3)
+      '@tanstack/typedoc-config':
+        specifier: 0.3.3
+        version: 0.3.3(typescript@5.9.3)
+      '@testing-library/jest-dom':
+        specifier: ^6.9.1
+        version: 6.9.1
+      '@types/node':
+        specifier: ^25.0.7
+        version: 25.2.2
+      eslint:
+        specifier: ^9.39.2
+        version: 9.39.2(jiti@2.6.1)
+      eslint-plugin-unused-imports:
+        specifier: ^4.3.0
+        version: 4.4.1(@typescript-eslint/eslint-plugin@8.55.0(@typescript-eslint/parser@8.55.0(eslint@9.39.2(jiti@2.6.1))(typescript@5.9.3))(eslint@9.39.2(jiti@2.6.1))(typescript@5.9.3))(eslint@9.39.2(jiti@2.6.1))
+      happy-dom:
+        specifier: ^20.1.0
+        version: 20.5.3
+      knip:
+        specifier: ^5.80.2
+        version: 5.83.1(@types/node@25.2.2)(typescript@5.9.3)
+      markdown-link-extractor:
+        specifier: ^4.0.3
+        version: 4.0.3
+      nx:
+        specifier: ^22.3.3
+        version: 22.4.5
+      premove:
+        specifier: ^4.0.0
+        version: 4.0.0
+      prettier:
+        specifier: ^3.7.4
+        version: 3.8.1
+      prettier-plugin-svelte:
+        specifier: ^3.4.1
+        version: 3.4.1(prettier@3.8.1)(svelte@5.50.0)
+      publint:
+        specifier: ^0.3.16
+        version: 0.3.17
+      sherif:
+        specifier: ^1.9.0
+        version: 1.10.0
+      tinyglobby:
+        specifier: ^0.2.15
+        version: 0.2.15
+      tsdown:
+        specifier: ^0.19.0
+        version: 0.19.0(oxc-resolver@11.17.1)(publint@0.3.17)(typescript@5.9.3)
+      typescript:
+        specifier: 5.9.3
+        version: 5.9.3
+      vite-tsconfig-paths:
+        specifier: ^6.1.1
+        version: 6.1.1(typescript@5.9.3)(vite@7.3.1(@types/node@25.2.2)(jiti@2.6.1)(yaml@2.8.2))
+      vitest:
+        specifier: ^4.0.17
+        version: 4.0.18(@types/node@25.2.2)(happy-dom@20.5.3)(jiti@2.6.1)(msw@2.13.2(@types/node@25.2.2)(typescript@5.9.3))(yaml@2.8.2)
+
+  examples/react/calendar:
+    dependencies:
+      '@base-ui/react':
+        specifier: ^1.3.0
+        version: 1.3.0(@types/react@19.2.13)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      '@fontsource-variable/geist':
+        specifier: ^5.2.8
+        version: 5.2.8
+      '@tanstack/react-devtools':
+        specifier: ^0.9.5
+        version: 0.9.5(@types/react-dom@19.2.3(@types/react@19.2.13))(@types/react@19.2.13)(csstype@3.2.3)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)(solid-js@1.9.12)
+      '@tanstack/react-time':
+        specifier: workspace:*
+        version: link:../../../packages/react-time
+      '@tanstack/react-time-devtools':
+        specifier: workspace:*
+        version: link:../../../packages/react-time-devtools
+      '@tanstack/time':
+        specifier: workspace:*
+        version: link:../../../packages/time
+      class-variance-authority:
+        specifier: ^0.7.1
+        version: 0.7.1
+      clsx:
+        specifier: ^2.1.1
+        version: 2.1.1
+      lucide-react:
+        specifier: ^1.8.0
+        version: 1.8.0(react@19.2.4)
+      react:
+        specifier: ^19.2.3
+        version: 19.2.4
+      react-dom:
+        specifier: ^19.2.3
+        version: 19.2.4(react@19.2.4)
+      shadcn:
+        specifier: ^4.2.0
+        version: 4.2.0(@types/node@25.2.2)(typescript@5.9.3)
+      tailwind-merge:
+        specifier: ^3.5.0
+        version: 3.5.0
+      tw-animate-css:
+        specifier: ^1.4.0
+        version: 1.4.0
+    devDependencies:
+      '@types/react':
+        specifier: ^19.2.8
+        version: 19.2.13
+      '@types/react-dom':
+        specifier: ^19.2.3
+        version: 19.2.3(@types/react@19.2.13)
+      '@vitejs/plugin-react':
+        specifier: ^5.1.2
+        version: 5.1.3(vite@7.3.1(@types/node@25.2.2)(jiti@1.21.7)(yaml@2.8.2))
+      autoprefixer:
+        specifier: ^10.4.20
+        version: 10.4.24(postcss@8.5.6)
+      postcss:
+        specifier: ^8.4.49
+        version: 8.5.6
+      tailwindcss:
+        specifier: ^3.4.17
+        version: 3.4.19(yaml@2.8.2)
+      typescript:
+        specifier: 5.9.3
+        version: 5.9.3
+      vite:
+        specifier: ^7.3.1
+        version: 7.3.1(@types/node@25.2.2)(jiti@1.21.7)(yaml@2.8.2)
+
+  examples/react/timeline:
+    dependencies:
+      '@dnd-kit/react':
+        specifier: ^0.3.2
+        version: 0.3.2(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      '@radix-ui/react-dialog':
+        specifier: ^1.1.15
+        version: 1.1.15(@types/react-dom@19.2.3(@types/react@19.2.13))(@types/react@19.2.13)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      '@radix-ui/react-icons':
+        specifier: ^1.3.2
+        version: 1.3.2(react@19.2.4)
+      '@radix-ui/react-label':
+        specifier: ^2.1.8
+        version: 2.1.8(@types/react-dom@19.2.3(@types/react@19.2.13))(@types/react@19.2.13)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      '@radix-ui/react-scroll-area':
+        specifier: ^1.2.10
+        version: 1.2.10(@types/react-dom@19.2.3(@types/react@19.2.13))(@types/react@19.2.13)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      '@radix-ui/react-select':
+        specifier: ^2.2.6
+        version: 2.2.6(@types/react-dom@19.2.3(@types/react@19.2.13))(@types/react@19.2.13)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      '@radix-ui/react-slot':
+        specifier: ^1.2.4
+        version: 1.2.4(@types/react@19.2.13)(react@19.2.4)
+      '@radix-ui/react-tooltip':
+        specifier: ^1.2.8
+        version: 1.2.8(@types/react-dom@19.2.3(@types/react@19.2.13))(@types/react@19.2.13)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      '@tanstack/react-devtools':
+        specifier: ^0.9.5
+        version: 0.9.5(@types/react-dom@19.2.3(@types/react@19.2.13))(@types/react@19.2.13)(csstype@3.2.3)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)(solid-js@1.9.12)
+      '@tanstack/react-query':
+        specifier: ^5.95.2
+        version: 5.95.2(react@19.2.4)
+      '@tanstack/react-query-devtools':
+        specifier: ^5.95.2
+        version: 5.95.2(@tanstack/react-query@5.95.2(react@19.2.4))(react@19.2.4)
+      '@tanstack/react-time':
+        specifier: workspace:*
+        version: link:../../../packages/react-time
+      '@tanstack/react-time-devtools':
+        specifier: workspace:*
+        version: link:../../../packages/react-time-devtools
+      '@tanstack/react-virtual':
+        specifier: ^3.13.24
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+      '@tanstack/time':
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+        version: 12.10.1(@types/react@19.2.13)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
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+        version: 0.7.1
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+        version: 2.1.1
+      lucide-react:
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+        version: 1.8.0(react@19.2.4)
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+        version: 19.2.4
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+        version: 19.2.4(react@19.2.4)
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+        version: 3.5.0
+      tailwindcss-animate:
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+        version: 1.0.7(tailwindcss@3.4.19(yaml@2.8.2))
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+        version: 19.2.13
+      '@types/react-dom':
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+        version: 19.2.3(@types/react@19.2.13)
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+        version: 5.1.3(vite@7.3.1(@types/node@25.2.2)(jiti@2.6.1)(yaml@2.8.2))
+      autoprefixer:
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+        version: 10.4.24(postcss@8.5.6)
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+        version: 8.5.6
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+        version: 3.4.19(yaml@2.8.2)
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+        version: 5.9.3
+      vite:
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+        version: 7.3.1(@types/node@25.2.2)(jiti@2.6.1)(yaml@2.8.2)
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+    dependencies:
+      '@tanstack/react-store':
+        specifier: ^0.8.0
+        version: 0.8.0(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      '@tanstack/time':
+        specifier: workspace:*
+        version: link:../time
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+        version: 19.2.4(react@19.2.4)
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+        version: 2.12.2(eslint@9.39.2(jiti@2.6.1))(typescript@5.9.3)
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+      '@types/react':
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+        version: 19.2.13
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+        version: 5.1.3(vite@7.3.1(@types/node@25.2.2)(jiti@2.6.1)(yaml@2.8.2))
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+        version: 19.1.0-rc.2(eslint@9.39.2(jiti@2.6.1))
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+        version: 7.0.1(eslint@9.39.2(jiti@2.6.1))
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+        version: 19.2.4
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+    dependencies:
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+        version: 0.4.0(@types/react@19.2.13)(react@19.2.4)(solid-js@1.9.11)
+      '@tanstack/time-devtools':
+        specifier: workspace:*
+        version: link:../time-devtools
+      react-dom:
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+        version: 19.2.4(react@19.2.4)
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+        version: 2.12.2(eslint@9.39.2(jiti@2.6.1))(typescript@5.9.3)
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+        version: 19.2.4
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+      '@tanstack/time':
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+        version: link:../time
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+
+  packages/solid-time-devtools:
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+        version: 0.4.0(@types/react@19.2.13)(react@19.2.4)(solid-js@1.9.11)
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+        version: link:../time-devtools
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+  packages/time:
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+  packages/time-devtools:
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+      '@tanstack/time':
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+        version: link:../time
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+  zod-to-json-schema@3.25.2(zod@3.25.76):
+    dependencies:
+      zod: 3.25.76
+
+  zod-validation-error@3.5.4(zod@3.25.76):
+    dependencies:
+      zod: 3.25.76
+
+  zod-validation-error@4.0.2(zod@4.3.6):
+    dependencies:
+      zod: 4.3.6
+
+  zod@3.25.76: {}
+
+  zod@4.3.6: {}
+
+  zustand@4.5.7(@types/react@19.2.13)(react@19.2.4):
+    dependencies:
+      use-sync-external-store: 1.6.0(react@19.2.4)
+    optionalDependencies:
+      '@types/react': 19.2.13
+      react: 19.2.4
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
new file mode 100644
index 00000000..990234dc
--- /dev/null
+++ b/pnpm-workspace.yaml
@@ -0,0 +1,30 @@
+cleanupUnusedCatalogs: true
+linkWorkspacePackages: true
+preferWorkspacePackages: true
+blockExoticSubdeps: true
+trustPolicy: 'no-downgrade'
+trustPolicyExclude:
+  - 'reselect@5.1.1' # Socket.dev score 100; status popular/healthy; evidence: 37M weekly downloads, 6 maintainers, source reduxjs/reselect.
+  - 'semver@6.3.1' # Socket.dev score 100; status popular/healthy; evidence: 673M weekly downloads, 6 maintainers, source npm/node-semver.
+minimumReleaseAge: 1440
+
+packages:
+  - 'examples/**/*'
+  - 'packages/*'
+
+allowBuilds:
+  # root dependency
+  nx: true
+  unrs-resolver: false # not directly required for build
+  esbuild: true
+
+  # vitest
+  msw: false
+
+overrides:
+  '@tanstack/time': 'workspace:*'
+  '@tanstack/time-devtools': 'workspace:*'
+  '@tanstack/react-time': 'workspace:*'
+  '@tanstack/react-time-devtools': 'workspace:*'
+  '@tanstack/solid-time': 'workspace:*'
+  '@tanstack/solid-time-devtools': 'workspace:*'
diff --git a/prettier.config.js b/prettier.config.js
new file mode 100644
index 00000000..dbb08b11
--- /dev/null
+++ b/prettier.config.js
@@ -0,0 +1,12 @@
+// @ts-check
+
+/** @type {import('prettier').Config} */
+const config = {
+  semi: false,
+  singleQuote: true,
+  trailingComma: 'all',
+  plugins: ['prettier-plugin-svelte'],
+  overrides: [{ files: '*.svelte', options: { parser: 'svelte' } }],
+}
+
+export default config
diff --git a/scripts/generate-docs.ts b/scripts/generate-docs.ts
new file mode 100644
index 00000000..99c72999
--- /dev/null
+++ b/scripts/generate-docs.ts
@@ -0,0 +1,34 @@
+import { resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { generateReferenceDocs } from '@tanstack/typedoc-config'
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url))
+
+await generateReferenceDocs({
+  packages: [
+    {
+      name: 'time',
+      entryPoints: [resolve(__dirname, '../packages/time/src/index.ts')],
+      tsconfig: resolve(__dirname, '../packages/time/tsconfig.docs.json'),
+      outputDir: resolve(__dirname, '../docs/reference'),
+    },
+    {
+      name: 'react-time',
+      entryPoints: [resolve(__dirname, '../packages/react-time/src/index.ts')],
+      tsconfig: resolve(__dirname, '../packages/react-time/tsconfig.docs.json'),
+      outputDir: resolve(__dirname, '../docs/framework/react/reference'),
+      exclude: ['packages/time/**/*'],
+    },
+    {
+      name: 'solid-time',
+      entryPoints: [resolve(__dirname, '../packages/solid-time/src/index.ts')],
+      tsconfig: resolve(__dirname, '../packages/solid-time/tsconfig.docs.json'),
+      outputDir: resolve(__dirname, '../docs/framework/solid/reference'),
+      exclude: ['packages/time/**/*'],
+    },
+  ],
+})
+
+console.log('\n✅ All markdown files have been processed!')
+
+process.exit(0)
diff --git a/scripts/graphify.ts b/scripts/graphify.ts
new file mode 100644
index 00000000..80efbd6e
--- /dev/null
+++ b/scripts/graphify.ts
@@ -0,0 +1,153 @@
+import { glob } from 'tinyglobby'
+import { readFile, writeFile } from 'node:fs/promises'
+import { resolve, relative, dirname } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const __dirname = dirname(fileURLToPath(import.meta.url))
+const root = resolve(__dirname, '..')
+
+interface PackageNode {
+  name: string
+  path: string
+  exports: string[]
+  dependencies: string[]
+  devDependencies: string[]
+  peerDependencies: string[]
+  internalDeps: string[]
+  files: string[]
+  tests: string[]
+}
+
+interface Graph {
+  generated: string
+  packages: PackageNode[]
+  edges: { from: string; to: string; type: string }[]
+}
+
+async function getExports(filePath: string): Promise<string[]> {
+  const content = await readFile(filePath, 'utf-8')
+  const exports: string[] = []
+
+  const namedExport =
+    /export\s+(?:const|let|var|function|class|interface|type|enum)\s+(\w+)/g
+  let match: RegExpExecArray | null
+  while ((match = namedExport.exec(content)) !== null) {
+    exports.push(match[1])
+  }
+
+  const defaultExport = /export\s+default\s+(\w+)/g
+  while ((match = defaultExport.exec(content)) !== null) {
+    exports.push(`default ${match[1]}`)
+  }
+
+  const reExport = /export\s+\*\s+from\s+['"]([^'"]+)['"]/g
+  while ((match = reExport.exec(content)) !== null) {
+    exports.push(`* from ${match[1]}`)
+  }
+
+  const namedReExport = /export\s+\{([^}]+)\}\s+from\s+['"]([^'"]+)['"]/g
+  while ((match = namedReExport.exec(content)) !== null) {
+    const names = match[1]
+      .split(',')
+      .map((s) =>
+        s
+          .trim()
+          .split(/\s+as\s+/)[0]
+          .trim(),
+      )
+      .filter(Boolean)
+    exports.push(...names.map((n) => `${n} from ${match[2]}`))
+  }
+
+  const blockExport = /export\s+\{([^}]+)\}/g
+  while ((match = blockExport.exec(content)) !== null) {
+    const names = match[1]
+      .split(',')
+      .map((s) =>
+        s
+          .trim()
+          .split(/\s+as\s+/)[0]
+          .split(':')[0]
+          .trim(),
+      )
+      .filter(Boolean)
+    exports.push(...names)
+  }
+
+  return [...new Set(exports)]
+}
+
+async function buildGraph(): Promise<Graph> {
+  const packageJsonPaths = await glob('packages/**/package.json', {
+    cwd: root,
+    ignore: ['**/node_modules/**'],
+  })
+  const packages: PackageNode[] = []
+  const edges: Graph['edges'] = []
+
+  for (const pkgPath of packageJsonPaths) {
+    const fullPath = resolve(root, pkgPath)
+    const content = await readFile(fullPath, 'utf-8')
+    const pkg = JSON.parse(content)
+    const dir = dirname(pkgPath)
+
+    const srcFiles = await glob(`${dir}/src/**/*.ts`, {
+      cwd: root,
+      ignore: ['**/node_modules/**'],
+    })
+    const testFiles = srcFiles.filter((f) => f.includes('.test.'))
+    const nonTestFiles = srcFiles.filter((f) => !f.includes('.test.'))
+
+    let exports: string[] = []
+    const indexFile = nonTestFiles.find((f) => f.endsWith('/index.ts'))
+    if (indexFile) {
+      exports = await getExports(resolve(root, indexFile))
+    }
+
+    const deps = Object.keys(pkg.dependencies || {})
+    const devDeps = Object.keys(pkg.devDependencies || {})
+    const peerDeps = Object.keys(pkg.peerDependencies || {})
+    const internalDeps = deps.filter((d) => d.startsWith('@tanstack/'))
+
+    const node: PackageNode = {
+      name: pkg.name,
+      path: dir,
+      exports,
+      dependencies: deps,
+      devDependencies: devDeps,
+      peerDependencies: peerDeps,
+      internalDeps,
+      files: nonTestFiles.map((f) => relative(root, f)),
+      tests: testFiles.map((f) => relative(root, f)),
+    }
+    packages.push(node)
+
+    for (const dep of internalDeps) {
+      edges.push({
+        from: pkg.name,
+        to: dep,
+        type: 'dependency',
+      })
+    }
+  }
+
+  return {
+    generated: new Date().toISOString(),
+    packages,
+    edges,
+  }
+}
+
+async function main() {
+  const graph = await buildGraph()
+  const outputPath = resolve(root, '.ai', 'graph.json')
+  await writeFile(outputPath, JSON.stringify(graph, null, 2))
+  console.log(`Graph written to ${relative(root, outputPath)}`)
+  console.log(`Packages: ${graph.packages.length}`)
+  console.log(`Edges: ${graph.edges.length}`)
+}
+
+main().catch((err) => {
+  console.error(err)
+  process.exit(1)
+})
diff --git a/scripts/verify-links.ts b/scripts/verify-links.ts
new file mode 100644
index 00000000..8a1c40dd
--- /dev/null
+++ b/scripts/verify-links.ts
@@ -0,0 +1,125 @@
+import { existsSync, readFileSync, statSync } from 'node:fs'
+import { extname, resolve } from 'node:path'
+import { glob } from 'tinyglobby'
+// @ts-ignore Could not find a declaration file for module 'markdown-link-extractor'.
+import markdownLinkExtractor from 'markdown-link-extractor'
+
+const errors: Array<{
+  file: string
+  link: string
+  resolvedPath: string
+  reason: string
+}> = []
+
+function isRelativeLink(link: string) {
+  return (
+    !link.startsWith('/') &&
+    !link.startsWith('http://') &&
+    !link.startsWith('https://') &&
+    !link.startsWith('//') &&
+    !link.startsWith('#') &&
+    !link.startsWith('mailto:')
+  )
+}
+
+/** Remove any trailing .md */
+function stripExtension(p: string): string {
+  return p.replace(`${extname(p)}`, '')
+}
+
+function relativeLinkExists(link: string, file: string): boolean {
+  // Remove hash if present
+  const linkWithoutHash = link.split('#')[0]
+  // If the link is empty after removing hash, it's not a file
+  if (!linkWithoutHash) return false
+
+  // Strip the file/link extensions
+  const filePath = stripExtension(file)
+  const linkPath = stripExtension(linkWithoutHash)
+
+  // Resolve the path relative to the markdown file's directory
+  // Nav up a level to simulate how links are resolved on the web
+  let absPath = resolve(filePath, '..', linkPath)
+
+  // Ensure the resolved path is within /docs
+  const docsRoot = resolve('docs')
+  if (!absPath.startsWith(docsRoot)) {
+    errors.push({
+      link,
+      file,
+      resolvedPath: absPath,
+      reason: 'Path outside /docs',
+    })
+    return false
+  }
+
+  // Check if this is an example path
+  const isExample = absPath.includes('/examples/')
+
+  let exists = false
+
+  if (isExample) {
+    // Transform /docs/framework/{framework}/examples/ to /examples/{framework}/
+    absPath = absPath.replace(
+      /\/docs\/framework\/([^/]+)\/examples\//,
+      '/examples/$1/',
+    )
+    // For examples, we want to check if the directory exists
+    exists = existsSync(absPath) && statSync(absPath).isDirectory()
+  } else {
+    // For non-examples, we want to check if the .md file exists
+    if (!absPath.endsWith('.md')) {
+      absPath = `${absPath}.md`
+    }
+    exists = existsSync(absPath)
+  }
+
+  if (!exists) {
+    errors.push({
+      link,
+      file,
+      resolvedPath: absPath,
+      reason: 'Not found',
+    })
+  }
+  return exists
+}
+
+async function verifyMarkdownLinks() {
+  // Find all markdown files in docs directory
+  const markdownFiles = await glob('docs/**/*.md', {
+    ignore: ['**/node_modules/**'],
+  })
+
+  console.log(`Found ${markdownFiles.length} markdown files\n`)
+
+  // Process each file
+  for (const file of markdownFiles) {
+    const content = readFileSync(file, 'utf-8')
+    const links: Array<string> = markdownLinkExtractor(content)
+
+    const relativeLinks = links.filter((link: string) => {
+      return isRelativeLink(link)
+    })
+
+    if (relativeLinks.length > 0) {
+      relativeLinks.forEach((link) => {
+        relativeLinkExists(link, file)
+      })
+    }
+  }
+
+  if (errors.length > 0) {
+    console.log(`\n❌ Found ${errors.length} broken links:`)
+    errors.forEach((err) => {
+      console.log(
+        `${err.file}\n  link:      ${err.link}\n  resolved:  ${err.resolvedPath}\n  why:       ${err.reason}\n`,
+      )
+    })
+    process.exit(1)
+  } else {
+    console.log('\n✅ No broken links found!')
+  }
+}
+
+verifyMarkdownLinks().catch(console.error)
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..dfc0af38
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,28 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "compilerOptions": {
+    "allowJs": true,
+    "allowSyntheticDefaultImports": true,
+    "allowUnreachableCode": false,
+    "allowUnusedLabels": false,
+    "checkJs": true,
+    "declaration": true,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "isolatedModules": true,
+    "lib": ["DOM", "DOM.Iterable", "ES2022"],
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "noEmit": true,
+    "noImplicitReturns": true,
+    "noUncheckedIndexedAccess": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "resolveJsonModule": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "target": "ES2020",
+    "noErrorTruncation": true
+  },
+  "include": ["scripts", "*.config.*", "**/*.config.*", "vitest.workspace.js"]
+}
diff --git a/vitest.config.js b/vitest.config.js
new file mode 100644
index 00000000..0d4a267a
--- /dev/null
+++ b/vitest.config.js
@@ -0,0 +1,26 @@
+import { fileURLToPath } from 'node:url'
+import { defineConfig } from 'vitest/config'
+import tsconfigPaths from 'vite-tsconfig-paths'
+
+const timeRoot = fileURLToPath(new URL('./packages/time', import.meta.url))
+
+export default defineConfig({
+  test: {
+    projects: [
+      {
+        plugins: [tsconfigPaths({ root: timeRoot })],
+        test: {
+          name: '@tanstack/time',
+          include: [
+            'packages/time/src/**/*.test.ts',
+            'packages/time/src/**/*.spec.ts',
+          ],
+          environment: 'happy-dom',
+          globals: true,
+        },
+      },
+      './packages/react-time/vitest.config.ts',
+      './packages/solid-time/vitest.config.ts',
+    ],
+  },
+})