using System;

public class Program

{

    public static void Main()

    {

            DateTime today = DateTime.UtcNow;

            int daysUntilMonday = ((int) DayOfWeek.Monday - (int) today.DayOfWeek + 7) % 7;

            DateTime nextMonday = today.AddDays(daysUntilMonday);

            Console.WriteLine("Today Date "+today);

            Console.WriteLine("Next Monday "+new DateTime(nextMonday.Year, nextMonday.Month, nextMonday.Day, 0, 0, 0));     

            Console.WriteLine("Total Seconds to Sleep "+(nextMonday- today).TotalMilliseconds); 

        }

    }

​