using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            TimeSpan Time1 = DateTime.Parse("启动时间") - DateTime.Now;
  
            TimeSpan Time2 = DateTime.Parse("启动时间").AddSeconds(5) - DateTime.Parse("启动时间");

            TimeSpan Time3=Time2-Time1;
        }
    }
}