using System;

public class Program

{

    public static void Main()

    {

        var ticks = 621355968000000000;

        var epoch = new DateTime(1970, 1, 1, 1, 0, 0, 0);

        var date = new DateTime(ticks);

        var date2 = new DateTime(2021, 3, 31, 10, 56, 0);

        Console.WriteLine("Ticks:" + ticks + " date: " + date);

        Console.WriteLine("Date: " + date2.ToString() + " ticks: " + date2.Ticks);

        Console.WriteLine("Epoch ticks: " + epoch.Ticks);

    }

}