Fixed type conversion from DateTime/DateTimeOffset to TimeOnly

src/HotChocolate/Core/src/Types/Utilities/DefaultTypeConverter.Setup.cs

@@ -78,14 +78,14 @@ private static void RegisterDateTimeConversions(
         registry.Register<DateOnly, DateTimeOffset>(from => from.ToDateTime(default));
         registry.Register<DateTimeOffset, DateOnly>(from => DateOnly.FromDateTime(from.Date));
         registry.Register<DateOnly, DateTime>(from => from.ToDateTime(default));
-        registry.Register<DateTime, DateOnly>(from => DateOnly.FromDateTime(from.Date));
+        registry.Register<DateTime, DateOnly>(DateOnly.FromDateTime);
         registry.Register<DateOnly, string>(from => from.ToShortDateString());
         registry.Register<string, DateOnly>(from => DateOnly.Parse(from, InvariantCulture));
 
         registry.Register<TimeOnly, DateTimeOffset>(from => default(DateOnly).ToDateTime(from));
         registry.Register<DateTimeOffset, TimeOnly>(from => TimeOnly.FromDateTime(from.Date));
         registry.Register<TimeOnly, DateTime>(from => default(DateOnly).ToDateTime(from));
-        registry.Register<DateTime, TimeOnly>(from => TimeOnly.FromDateTime(from.Date));
+        registry.Register<DateTime, TimeOnly>(TimeOnly.FromDateTime);
         registry.Register<TimeOnly, TimeSpan>(from => from.ToTimeSpan());
         registry.Register<TimeSpan, TimeOnly>(TimeOnly.FromTimeSpan);
         registry.Register<TimeOnly, string>(from => from.ToShortTimeString());

src/HotChocolate/Core/test/Types.Tests/Utilities/TypeConversionTests.cs

@@ -505,6 +505,25 @@ public void Convert_WithDependencyInjection()
         Assert.Equal("Bar", converted);
     }
 
+    [Fact]
+    public void Convert_DateTime_TimeOnly()
+    {
+        // arrange
+        var source = new DateTime(2024, 1, 1, 12, 45, 10, DateTimeKind.Utc);
+
+        // act
+        var success = DefaultTypeConverter.Default.TryConvert(
+            typeof(DateTime), typeof(TimeOnly),
+            source, out var output,
+            out var conversionException);
+
+        // assert
+        Assert.True(success);
+        Assert.Null(conversionException);
+        Assert.IsType<TimeOnly>(output);
+        Assert.Equal(new TimeOnly(12, 45, 10), output);
+    }
+
     public enum FooOrBar
     {
         Foo,