using System;

using Newtonsoft.Json;

​

public class Program

{

    public static void Main()

    {

        var data = new Data { Time = long.MaxValue };

        string json = JsonConvert.SerializeObject(data);

        Console.WriteLine(json);

        var data2 = JsonConvert.DeserializeObject<Data>(json);

        Console.Write(data2.Time);

    }

    public class Data

    {

        public long Time { get; set; }

    }

}