gistfile1.cs

using System;
using System.Diagnostics;
using System.Threading;

namespace ConsoleApplication18
{
    class Program
    {
        static void Main(string[] args)
        {
            new Program().Run();
        }

        private DateTime _startTime;
        private Stopwatch _stopwatch;

        private void Run()
        {
            _startTime = DateTime.Now;
            _stopwatch = new Stopwatch();
            _stopwatch.Start();
            while (true)
            {
                Print();
                Thread.Sleep(10000);
            }
        }

        private void Print()
        {
            var watchDiff = _stopwatch.Elapsed.TotalMilliseconds;
            var dateDiff = (DateTime.Now - _startTime).TotalMilliseconds;
            Console.WriteLine("StopWatch : {0:F1}  DateTime : {1:F1} Diff : {2:F2}" , watchDiff, dateDiff, dateDiff-watchDiff);
        }
    }
}