title: WebAPI OData DateTime error
body: <p>Same question was asked here <a href="http://forums.asp.net/post/5243863.aspx" rel="nofollow">http://forums.asp.net/post/5243863.aspx</a> but no answers yet.</p>
  
  <p>A filter query like $filter=TimeRequested eq datetime'2012-12-17' OR $filter=TimeRequested eq datetime'2012-12-17T08:36:06' is erroring out with </p>
  
  <p>Microsoft.Data.OData.ODataException: A binary operator with incompatible types was detected. Found operand types 'Edm.String' and 'Edm.DateTime' for operator kind 'Equal'.</p>