diff --git a/src/Umbraco.Core/Extensions/DateTimeExtensions.cs b/src/Umbraco.Core/Extensions/DateTimeExtensions.cs
index 00191e5a76..9fadb6217a 100644
--- a/src/Umbraco.Core/Extensions/DateTimeExtensions.cs
+++ b/src/Umbraco.Core/Extensions/DateTimeExtensions.cs
@@ -5,6 +5,9 @@ using System.Globalization;
 
 namespace Umbraco.Extensions;
 
+/// <summary>
+/// Provides Extensions for <see cref="DateTime"/>.
+/// </summary>
 public static class DateTimeExtensions
 {
     /// <summary>
@@ -18,6 +21,7 @@ public static class DateTimeExtensions
         Hour,
         Minute,
         Second,
+        Millisecond,
     }
 
     /// <summary>
@@ -35,32 +39,15 @@ public static class DateTimeExtensions
     /// <param name="truncateTo">The level to truncate the date to.</param>
     /// <returns>The truncated date.</returns>
     public static DateTime TruncateTo(this DateTime dt, DateTruncate truncateTo)
-    {
-        if (truncateTo == DateTruncate.Year)
+        => truncateTo switch
         {
-            return new DateTime(dt.Year, 1, 1, 0, 0, 0, dt.Kind);
-        }
-
-        if (truncateTo == DateTruncate.Month)
-        {
-            return new DateTime(dt.Year, dt.Month, 1, 0, 0, 0, dt.Kind);
-        }
-
-        if (truncateTo == DateTruncate.Day)
-        {
-            return new DateTime(dt.Year, dt.Month, dt.Day, 0, 0, 0, dt.Kind);
-        }
-
-        if (truncateTo == DateTruncate.Hour)
-        {
-            return new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, 0, 0, dt.Kind);
-        }
-
-        if (truncateTo == DateTruncate.Minute)
-        {
-            return new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, 0, dt.Kind);
-        }
-
-        return new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, dt.Second, dt.Kind);
-    }
+            DateTruncate.Year => new DateTime(dt.Year, 1, 1, 0, 0, 0, dt.Kind),
+            DateTruncate.Month => new DateTime(dt.Year, dt.Month, 1, 0, 0, 0, dt.Kind),
+            DateTruncate.Day => new DateTime(dt.Year, dt.Month, dt.Day, 0, 0, 0, dt.Kind),
+            DateTruncate.Hour => new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, 0, 0, dt.Kind),
+            DateTruncate.Minute => new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, 0, dt.Kind),
+            DateTruncate.Second => new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, dt.Second, dt.Kind),
+            DateTruncate.Millisecond => new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, dt.Second, dt.Millisecond, dt.Kind),
+            _ => throw new ArgumentOutOfRangeException(nameof(truncateTo), truncateTo, "Invalid truncation level"),
+        };
 }
diff --git a/tests/Umbraco.Tests.Integration/Umbraco.Infrastructure/Services/ContentEditingServiceTests.Update.cs b/tests/Umbraco.Tests.Integration/Umbraco.Infrastructure/Services/ContentEditingServiceTests.Update.cs
index b760d94c29..589c4a3516 100644
--- a/tests/Umbraco.Tests.Integration/Umbraco.Infrastructure/Services/ContentEditingServiceTests.Update.cs
+++ b/tests/Umbraco.Tests.Integration/Umbraco.Infrastructure/Services/ContentEditingServiceTests.Update.cs
@@ -569,7 +569,7 @@ public partial class ContentEditingServiceTests
     }
 
     [Test]
-    public async Task Updating_Single_Variant_Name_Does_Not_Change_Update_Dates_Of_Other_Vaiants()
+    public async Task Updating_Single_Variant_Name_Does_Not_Change_Update_Dates_Of_Other_Variants()
     {
         var contentType = await CreateVariantContentType(variantTitleAsMandatory: false);
 
@@ -614,11 +614,11 @@ public partial class ContentEditingServiceTests
         void VerifyUpdate(IContent? updatedContent)
         {
             Assert.IsNotNull(updatedContent);
-            Assert.AreEqual(firstUpdateDateDa, updatedContent.GetUpdateDate("da-DK"));
+            Assert.AreEqual(firstUpdateDateDa?.TruncateTo(DateTimeExtensions.DateTruncate.Millisecond), updatedContent.GetUpdateDate("da-DK")?.TruncateTo(DateTimeExtensions.DateTruncate.Millisecond));
 
             var lastUpdateDateEn = updatedContent.GetUpdateDate("en-US")
                                    ?? throw new InvalidOperationException("Expected a publish date for EN");
-            Assert.Greater(lastUpdateDateEn, firstUpdateDateEn);
+            Assert.Greater(lastUpdateDateEn.TruncateTo(DateTimeExtensions.DateTruncate.Millisecond), firstUpdateDateEn?.TruncateTo(DateTimeExtensions.DateTruncate.Millisecond));
         }
     }
 
@@ -671,11 +671,11 @@ public partial class ContentEditingServiceTests
         void VerifyUpdate(IContent? updatedContent)
         {
             Assert.IsNotNull(updatedContent);
-            Assert.AreEqual(firstUpdateDateEn, updatedContent.GetUpdateDate("en-US"));
+            Assert.AreEqual(firstUpdateDateEn.TruncateTo(DateTimeExtensions.DateTruncate.Millisecond), updatedContent.GetUpdateDate("en-US")?.TruncateTo(DateTimeExtensions.DateTruncate.Millisecond));
 
             var lastUpdateDateDa = updatedContent.GetUpdateDate("da-DK")
                                    ?? throw new InvalidOperationException("Expected an update date for DA");
-            Assert.Greater(lastUpdateDateDa, firstUpdateDateDa);
+            Assert.Greater(lastUpdateDateDa.TruncateTo(DateTimeExtensions.DateTruncate.Millisecond), firstUpdateDateDa.TruncateTo(DateTimeExtensions.DateTruncate.Millisecond));
         }
     }
 }
diff --git a/tests/Umbraco.Tests.UnitTests/Umbraco.Core/Extensions/DateTimeExtensionsTests.cs b/tests/Umbraco.Tests.UnitTests/Umbraco.Core/Extensions/DateTimeExtensionsTests.cs
new file mode 100644
index 0000000000..deffcfa7ca
--- /dev/null
+++ b/tests/Umbraco.Tests.UnitTests/Umbraco.Core/Extensions/DateTimeExtensionsTests.cs
@@ -0,0 +1,51 @@
+// Copyright (c) Umbraco.
+// See LICENSE for more details.
+
+using NUnit.Framework;
+using Umbraco.Extensions;
+
+namespace Umbraco.Cms.Tests.UnitTests.Umbraco.Core.Extensions;
+
+[TestFixture]
+public class DateTimeExtensionsTests
+{
+    [Test]
+    public void ToIsoString_ReturnsCorrectFormat()
+    {
+        var date = new DateTime(2025, 6, 9, 14, 30, 45, DateTimeKind.Utc);
+        var result = date.ToIsoString();
+        Assert.AreEqual("2025-06-09 14:30:45", result);
+    }
+
+    [TestCase(2023, 5, 15, 14, 30, 45, 123, DateTimeExtensions.DateTruncate.Year, 2023, 1, 1, 0, 0, 0, 0)]
+    [TestCase(2023, 5, 15, 14, 30, 45, 123, DateTimeExtensions.DateTruncate.Month, 2023, 5, 1, 0, 0, 0, 0)]
+    [TestCase(2023, 5, 15, 14, 30, 45, 123, DateTimeExtensions.DateTruncate.Day, 2023, 5, 15, 0, 0, 0, 0)]
+    [TestCase(2023, 5, 15, 14, 30, 45, 123, DateTimeExtensions.DateTruncate.Hour, 2023, 5, 15, 14, 0, 0, 0)]
+    [TestCase(2023, 5, 15, 14, 30, 45, 123, DateTimeExtensions.DateTruncate.Minute, 2023, 5, 15, 14, 30, 0, 0)]
+    [TestCase(2023, 5, 15, 14, 30, 45, 123, DateTimeExtensions.DateTruncate.Second, 2023, 5, 15, 14, 30, 45, 0)]
+    [TestCase(2023, 5, 15, 14, 30, 45, 123, DateTimeExtensions.DateTruncate.Millisecond, 2023, 5, 15, 14, 30, 45, 123)]
+    public void TruncateTo_TruncatesCorrectly(
+        int year,
+        int month,
+        int day,
+        int hour,
+        int minute,
+        int second,
+        int millisecond,
+        DateTimeExtensions.DateTruncate truncateTo,
+        int expectedYear,
+        int expectedMonth,
+        int expectedDay,
+        int expectedHour,
+        int expectedMinute,
+        int expectedSecond,
+        int expectedMillisecond)
+    {
+        var date = new DateTime(year, month, day, hour, minute, second, millisecond, DateTimeKind.Utc);
+        var expected = new DateTime(expectedYear, expectedMonth, expectedDay, expectedHour, expectedMinute, expectedSecond, expectedMillisecond, DateTimeKind.Utc);
+
+        var result = date.TruncateTo(truncateTo);
+
+        Assert.AreEqual(expected, result);
+    }
+}