using System;

using Newtonsoft.Json;

​

public class Program

{

    public class SomeErrorToJsonFactory

    {

        public static string CreateError()

        {

            return JsonConvert.SerializeObject(new { PropNameThatErred = new DateTime() });

        }

    }

    public static void Main()

    {

        var error = SomeErrorToJsonFactory.CreateError();

        Console.WriteLine(error);

    }

}