using System;

using JWT;

using JWT.Algorithms;

using JWT.Serializers;

public class Program

{

    private static IJsonSerializer _serializer = new JsonNetSerializer();

    private static IDateTimeProvider _provider = new UtcDateTimeProvider();

    private static IBase64UrlEncoder _urlEncoder = new JwtBase64UrlEncoder();

    private static IJwtAlgorithm _algorithm = new HMACSHA256Algorithm();

    public static void Main()

    {

        Console.WriteLine("Hello World");

        DateTime myDate = GetExpiryTimestamp("eyJhbGciOiJSUzI1NiIsImtpZCI6IlpTT2IwRU9PUE5Tc3FHQ19RemRWdmciLCJ0eXAiOiJhdCtqd3QifQ.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.d-WBLYS_itpDbwoqEhvAePAowar2bMNtsC0rBX5dw3GjiAWgVTj3QMRHKz_ZRbbIuwkjFzIHMMkiYmsQff8u_2zXc9am_anQEl2o-mJwcCpBNxZ4-zGC_h8j2Vgo1XWvjdBnefosM8Ki8dAJpBXS82qEze46puanv7kvi20QsjQW7JiDsymvvNhhwtfqKloTv4-zbeiXhNPgQ2Z33HfBD5AquAoB84pWEGRzTVLPtYoNubBQ8RZvkeBWpJqZ_3fFyT-oeaiNgcHa1Ap_ltegJv7IaH7Q4wq1e9_DdPC9s85bojPlUtfvpE7yF7UxrHzeKuklK_qEbqjN-xroxE52wQ");

        Console.Write(myDate.ToString());

    }

    public static DateTime GetExpiryTimestamp(string accessToken)

    {

      try

      {

        IJwtValidator _validator = new JwtValidator(_serializer, _provider);

        IJwtDecoder decoder = new JwtDecoder(_serializer, _validator, _urlEncoder, _algorithm);

        var token = decoder.DecodeToObject<JwtToken>(accessToken);

        DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeSeconds(token.exp);

        return dateTimeOffset.LocalDateTime;

      }

      catch (Exception ex)

      {

        return DateTime.MinValue;

      }

    }

}

​

public class JwtToken

  {

    public long exp { get; set; }

  }