Model/CountdownTimer.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace CustomTimers
{
    public class CountdownTimer : CustomTimer
    {
        private int _HourLatch = 0;
        private int _MinuteLatch = 0;
        private int _SecondLatch = 0;
        private int _MillisecondLatch = 0;

        //-----------------------------------------------
        // Private member functions
        //-----------------------------------------------
        private int UpdateInternalTimeRunning = 0;
        private void UpdateInternalTime ()
        {
            // Prevent Reentry
            if (Interlocked.Exchange (ref UpdateInternalTimeRunning, 1) == 0)
            {
                //DateTime currentTime = DateTime.Now;

                //_Millisecond -= (currentTime.Millisecond - _SystemTimeLatched.Millisecond);
                //_Second -= (currentTime.Second - _SystemTimeLatched.Second);
                //_Minute -= (currentTime.Minute - _SystemTimeLatched.Minute);
                //_Hour -= (currentTime.Hour - _SystemTimeLatched.Hour);

                //_SystemTimeLatched = DateTime.Now;

                _DiagnosticsStopWatch.Stop ();
                TimeSpan timeElapsed = _DiagnosticsStopWatch.Elapsed;

                long totalMilliseconds = Convert.ToInt64 (timeElapsed.TotalMilliseconds);
                long intervalInMs = GetIntervalInMilliseconds ();

                long totalTime = Convert.ToInt64 (
                    (double) totalMilliseconds / (double) intervalInMs)
                    * intervalInMs;

                _Millisecond = _MillisecondLatch - (int) (totalTime % 1000);
                totalTime = totalTime / 1000;

                _Second = _SecondLatch - (int) (totalTime % 60);
                totalTime = totalTime / 60;

                _Minute = _MinuteLatch - (int) (totalTime % 60);
                totalTime = totalTime / 60;

                _Hour = _HourLatch - (int) (totalTime % 60);

                FindEffectivTime ();

                if (_Millisecond == 0 && _Second == 0 &&
                        _Minute == 0 && _Hour == 0)
                {
                    if (State != TimerStates.Stopped)
                    {