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I am trying to use the NETFx Json.NET MediaTypeFormatter nuget package to swap out the default DataContractJsonSerializer in my WCF REST service (4.0 framework). I downloaded the package in my project and added the following lines of code in the Global.asax file. void Application_Start(object sender, EventArgs e) { RegisterRoutes(); // Create Json.Net formatter serializing DateTime using the ISO 8601 format var serializerSettings = new JsonSerializerSettings(); serializerSettings.Converters.Add(new IsoDateTimeConverter()); var config = HttpHostConfiguration.Create(); config.Configuration.OperationHandlerFactory.Formatters.Clear(); config.Configuration.OperationHandlerFactory.Formatters.Insert(0, new JsonNetMediaTypeFormatter(serializerSettings)); } But when I run the service it still uses the DataContractJsonSerilizer for serialization. Below is the class I am returning from my service. [DataContract] public class SampleItem { [DataMember] public int Id { get; set; } [DataMember] public string StringValue { get; set; } [DataMember] public DateTime DateTime { get; set; } } Below is the response from the service in Fiddler. You can see that the DateTime is not in ISO format which I have specified in serializerSettings in the above code. This tells me that the JSON.NET serializer is not used for serializing the objects. Would appreciate any help.

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