diff --git a/DS4Windows/DS4Control/DTOXml/AppSettingsDTO.cs b/DS4Windows/DS4Control/DTOXml/AppSettingsDTO.cs
index bdc292c..0082d13 100644
--- a/DS4Windows/DS4Control/DTOXml/AppSettingsDTO.cs
+++ b/DS4Windows/DS4Control/DTOXml/AppSettingsDTO.cs
@@ -20,6 +20,7 @@ You should have received a copy of the GNU General Public License
 using System.Collections.Generic;
 using System.ComponentModel.Design;
 using System.Diagnostics;
+using System.Globalization;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -249,10 +250,10 @@ public DateTime LastChecked
         [XmlElement("LastChecked")]
         public string LastCheckString
         {
-            get => LastChecked.ToString("MM/dd/yyyy HH:mm:ss");
+            get => LastChecked.ToString("MM/dd/yyyy HH:mm:ss", CultureInfo.InvariantCulture);
             set
             {
-                if (DateTime.TryParse(value, out DateTime temp))
+                if (DateTime.TryParse(value, CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime temp))
                 {
                     LastChecked = temp;
                 }
diff --git a/DS4WindowsTests/AppSettingsTests.cs b/DS4WindowsTests/AppSettingsTests.cs
index 293ef04..c951cfd 100644
--- a/DS4WindowsTests/AppSettingsTests.cs
+++ b/DS4WindowsTests/AppSettingsTests.cs
@@ -18,6 +18,7 @@ You should have received a copy of the GNU General Public License
 
 using System.Configuration;
 using System;
+using System.Globalization;
 using System.Text;
 using System.Xml;
 using System.Xml.Serialization;
@@ -132,7 +133,7 @@ public void CheckSettingsRead()
             dto.MapTo(tempStore);
 
             // Check settings
-            DateTime.TryParse(dto.LastCheckString, out DateTime tempLastChecked);
+            DateTime.TryParse(dto.LastCheckString, CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime tempLastChecked);
             Assert.AreEqual(tempLastChecked, tempStore.lastChecked);
         }