I want to post json object to my WCF service

My only problem is his date property. I get the date from an jquery datepicker and i want to get it in my service as c# datetime.

My service:

namespace Employee
{
    [ServiceContract]
    public interface IService1
    {
        [OperationContract]
        [WebInvoke(Method = "POST", 
                   RequestFormat = WebMessageFormat.Json,
                   ResponseFormat = WebMessageFormat.Json,
                   BodyStyle = WebMessageBodyStyle.Wrapped)]
        bool UpdateEmployee(Employee Employee);
    }
}

And this is Employee:

[DataContract]
public class Employee
{
    [DataMember]
    public string Name { get; set; }

    [DataMember]
    public string Department { get; set; }

    [DataMember]
    public int Salary { get; set; }

    [DataMember]
    public DateTime Hired { get; set; }
}

All the other properties work fine. I just need to convert my date string to json date.