title: Json DateTime serialization is different in DataContractJsonSerializer and System.Json
body: <p>How can I force <a href="http://msdn.microsoft.com/en-us/library/system.runtime.serialization.json.datacontractjsonserializer.aspx">DataContractJsonSerializer</a> to accept <a href="http://nuget.org/packages/System.Json">System.Json</a> DateTime serialization format (ISO 8601) ?</p>
  
  <p>The problem is that System.Json output "2012-03-01T16:24:55.000" format but DataContractJsonSerializer need "/Date(1329161615596+0200)/" format.</p>
  
  <p>I have this error :
  There was an error deserializing the object of type xyz. DateTime content '2012-03-01T16:24:55.000' does not start with '/Date(' and end with ')/' as required for JSON.</p>