using System;

public class Program

{

    public static void Main()

    {

        var epochLong = 1576777162L;

        // is stored in milliseconds

        DateTime datetime = ConvertTicksToDateTime(epochLong);

        Console.WriteLine("Expired: " + datetime.ToString());

    }

     // long is in milliseconds need to convert

     //static DateTime ConvertTicksToDateTime(long ticks)

     //{

    //   var converted = ticks * 10000L;

    //   return new DateTime(converted);

     //}

    static DateTime ConvertTicksToDateTime(long ticks)

     {

        var now = DateTime.Now;

        //var dt = new DateTime(1970, 1, 1);

        //var dt2 = DateTime.Parse(dt.AddTicks(ticks).ToString());

        Console.WriteLine("before convert (now): " +  now.ToString());

        var ts = TimeSpan.FromMilliseconds(ticks);  

        var dt3 = now.AddTicks(-(ticks));

        //Console.WriteLine("...using timespan: " + dt3.ToString());

        return dt3;

     }

}