using System;

using System.Runtime;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

using System.Globalization;

using System.IO;

using Newtonsoft.Json;

​

namespace HelloWorld

{

    public class Program

    {

        public static void Main(string[] args)

        {

            string updatedExpirationDateTime = "2220-09-06T21:38:15Z";

            DateTime siwftTime = DateTime.Parse(updatedExpirationDateTime, CultureInfo.InvariantCulture);

            Console.WriteLine(siwftTime.ToString(@"yyyyMMddHHmmss.0\Z"));

            DateTime adldsTime = DateTime.SpecifyKind(

                DateTime.ParseExact("22200906213815.0Z", @"yyyyMMddHHmmss.0\Z", CultureInfo.InvariantCulture),

                DateTimeKind.Utc);

            JsonSerializer jsonSerializer =  new JsonSerializer();

            StringWriter stringWriter = new StringWriter();

            JsonWriter jsonWriter = new JsonTextWriter(stringWriter);

            jsonWriter.StringEscapeHandling = StringEscapeHandling.EscapeNonAscii;

            jsonSerializer.Serialize(jsonWriter, siwftTime);

            Console.WriteLine("Swift time: {0}", stringWriter.ToString());

            jsonSerializer.Serialize(jsonWriter, adldsTime);

            Console.WriteLine("adlds time: {0}", stringWriter.ToString());

        }

    }

}