DateTimeOffset gets converted to DateTime with DateTimeKind.Unspecified.

DateTimeOffset gets converted to DateTime with DateTimeKind.Unspecified. This makes it hard to know what the time actually is.

Assemblies affected

System.Web.OData, Version=5.9.0.0

Reproduce steps

Define an entity type based on a .NET class with a property of type DateTime using ODataConventionModelBuilder.
Create a simple controller for it with a Post method.
Post and entity to it with the date specified including time zone, say, "2016-09-03T09:36:35.7788542Z"
Look at the value of the property. It has DateTimeKind.Unspecified.

Expected result

Should be Utc or Local.

Actual result

DateTimeKind is Unspecified

Additional details

System.Web.OData.Formatter.EdmPrimitiveHelpers.ConvertPrimitiveValue already offset to local time zone when converting DateTimeOffset to DateTime. Yet, because dateTimeOffsetValue.DateTime is used instead of either dateTimeOffsetValue.LocalDateTime or dateTimeOffsetValue.UtcDateTime the DateTime has the DateTimeKind.Unkown kind.

Start at System.Web.OData.Formatter.EdmPrimitiveHelpers.ConvertPrimitiveValue and inspect the DateTimeOffset-to-DateTime conversion path described in the report. Verify the resulting DateTime preserves an appropriate Utc or Local kind rather than Unspecified, then run the existing formatter tests covering primitive conversion.