updated changes.

Author: Vignesh-SF3580

src/Controls/src/Core/BindableProperty.cs

@@ -48,9 +48,7 @@ public sealed class BindableProperty
 			{ typeof(ImageSource), new ImageSourceConverter() },
 #if NET6_0_OR_GREATER
 			{ typeof(DateTime), new DateTimeTypeConverter() },
-			{ typeof(DateTime?), new DateTimeTypeConverter() },
-			{ typeof(TimeSpan), new TimeSpanTypeConverter() },
-			{ typeof(TimeSpan?), new TimeSpanTypeConverter() }
+			{ typeof(TimeSpan), new TimeSpanTypeConverter() }
 #endif
 		};
 
@@ -230,12 +228,15 @@ internal bool TryConvert(ref object value)
 				value = Convert.ChangeType(value, returnType);
 				return true;
 			}
-			if (KnownTypeConverters.TryGetValue(returnType, out TypeConverter typeConverterTo) && typeConverterTo.CanConvertFrom(valueType))
+
+			Type targetType = Nullable.GetUnderlyingType(returnType) ?? returnType;
+
+			if (KnownTypeConverters.TryGetValue(targetType, out TypeConverter typeConverterTo) && typeConverterTo.CanConvertFrom(valueType))
 			{
 				value = typeConverterTo.ConvertFrom(value);
 				return true;
 			}
-			if (KnownTypeConverters.TryGetValue(returnType, out typeConverterTo) && typeConverterTo.CanConvertFrom(typeof(string)))
+			if (KnownTypeConverters.TryGetValue(targetType, out typeConverterTo) && typeConverterTo.CanConvertFrom(typeof(string)))
 			{
 				value = typeConverterTo.ConvertFromInvariantString(value.ToString());
 				return true;

src/Controls/tests/Xaml.UnitTests/Issues/Issue20438.xaml

@@ -7,7 +7,7 @@
     <ContentPage.BindingContext>
         <local:Issue20438ViewModel/>
     </ContentPage.BindingContext>
-    <StackLayout>
+    <StackLayout x:DataType="local:Issue20438ViewModel">
         <DatePicker x:Name="datePicker"
                     Date="{Binding SelectedDate}"/>
         <TimePicker x:Name="timePicker"