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fix(demo): format month via PlainDate to avoid calendar-mismatch crash #27

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Merged
dogmar merged 1 commit into from
Jun 16, 2026
Merged

fix(demo): format month via PlainDate to avoid calendar-mismatch crash #27

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5 changes: 4 additions & 1 deletion website/src/routes/demo.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -159,7 +159,10 @@ function DemoApp() {

const handleMonthChange = useCallback(
(month: Temporal.PlainYearMonth) => {
const formatted = month.toLocaleString(locale, {
// Format through a PlainDate: a `PlainYearMonth` with the ISO calendar
// throws when toLocaleString resolves a different locale calendar (e.g.
// gregory for en-US). An ISO `PlainDate` renders in the locale calendar.
const formatted = month.toPlainDate({ day: 1 }).toLocaleString(locale, {
month: "long",
year: "numeric",
});
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