Improved handling of DateTimeKind when converting form DateTimeOffSet…

… to DateTime.

Related to question #897

src/Simple.OData.Client.Core/Cache/TypeCache.cs

@@ -257,7 +257,7 @@ public bool TryConvert(object? value, Type targetType, out object? result)
 			}
 			else if ((targetType == typeof(DateTime) || targetType == typeof(DateTime?)) && value is DateTimeOffset offset)
 			{
-				result = offset.DateTime;
+				result = offset.Offset == default ? offset.UtcDateTime : offset.DateTime;
 			}
 			else if ((targetType == typeof(DateTime) || targetType == typeof(DateTime?)) && ImplicitConversionTo<DateTime>(value) is MethodInfo implicitMethod)
 			{

src/Simple.OData.Client.UnitTests/Core/TypeCacheValueConversionTests.cs

@@ -57,6 +57,42 @@ public void TryConvert(object value, Type sourceType, Type targetType)
 		Assert.Equal(ChangeType(sourceValue, sourceType), ChangeType(targetValue, sourceType));
 	}
 
+	[Fact]
+	public void TryConvert_Should_Use_DateTimeKind_Utc_For_Utc_DateTimeOffset()
+	{
+		var toConvert = DateTimeOffset.UtcNow;
+
+		TypeCache.TryConvert(toConvert, typeof(DateTime), out var result);
+
+		var resultTyped = (DateTime)result;
+
+		Assert.Equal(DateTimeKind.Utc, resultTyped.Kind);
+
+		TypeCache.TryConvert(toConvert, typeof(DateTime?), out var resultNullable);
+
+		var resultNullableTyped = (DateTime?)result;
+
+		Assert.Equal(DateTimeKind.Utc, resultNullableTyped.Value.Kind);
+	}
+
+	[Fact]
+	public void TryConvert_Should_Use_DateTimeKind_Unspecified_For_Non_Utc_DateTimeOffset()
+	{
+		var toConvert = DateTimeOffset.Now;
+
+		TypeCache.TryConvert(toConvert, typeof(DateTime), out var result);
+
+		var resultTyped = (DateTime)result;
+
+		Assert.Equal(DateTimeKind.Unspecified, resultTyped.Kind);
+
+		TypeCache.TryConvert(toConvert, typeof(DateTime?), out var resultNullable);
+
+		var resultNullableTyped = (DateTime?)result;
+
+		Assert.Equal(DateTimeKind.Unspecified, resultNullableTyped.Value.Kind);
+	}
+
 	[Fact]
 	public void TryConvert_GeographyPoint()
 	{