private void GetTime()
 {
     SYSTEMTIME stime = new SYSTEMTIME();
     GetSystemTime(out stime);
     //labTime.Text = "Current Time:" + stime.wYear.ToString() + "/" + stime.wMonth.ToString() + "/" + stime.wDay.ToString() + "  " + stime.wHour.ToString() +":"+ stime.wMinute.ToString() +":"+ stime.wSecond.ToString();
     //lblError.Text = DateTime.Now.ToString("yyyyMMdd");
 }

        static void Main(string[] args)
        {
            TIME_ZONE_INFORMATION tz = new TIME_ZONE_INFORMATION();
            GetTimeZoneInformation(ref tz);

            string s = args[0];
            System.Globalization.DateTimeFormatInfo dtfi =
                new System.Globalization.DateTimeFormatInfo();
            dtfi.FullDateTimePattern = "dd/MM/yyyy HH:mm:ss zz";
            dtfi.DateSeparator = "/";
            dtfi.TimeSeparator = ":";
            DateTime dt =
                DateTime.Parse(s, dtfi);

            
            SYSTEMTIME time = new SYSTEMTIME(dt);
            //time.wDay = (ushort)dt.Day;
            //time.wHour = (ushort)dt.Hour;
            //time.wDayOfWeek = (ushort)dt.DayOfWeek;
            //time.wMilliseconds = (ushort)dt.Millisecond;
            //time.wMinute = (ushort)dt.Minute;
            //time.wMonth = (ushort)dt.Month;
            //time.wSecond = (ushort)dt.Second;
            //time.wYear = (ushort)dt.Year;

            SetSystemTime(ref time);
        }

        private static void Main(string[] args)
        {
            if (args.Length == 5)
            {
                var time = new SYSTEMTIME
                               {
                                   wDay = ushort.Parse(args[0]),
                                   wMonth = ushort.Parse(args[1]),
                                   wYear = ushort.Parse(args[2]),
                                   wHour = ushort.Parse(args[3]),
                                   wMinute = ushort.Parse(args[4])
                               };
                SetTime(time);
                return;
            }
            if (File.Exists("date.txt"))
            {

                var tr = new StreamReader("date.txt");
                string dateString = tr.ReadLine();
                if (dateString != null)
                {
                    dateString = dateString.Trim();
                    DateTime convertedDate = DateTime.Parse(dateString);
                    SetTime(convertedDate);
                }
            }
            else
            {
                SetTime(1, 1, 2012, 12, 00);
            }
        }

        static void Main(string[] args)
        {
            if (args.Length == 0 || (new string[] { "help", "--help", "/?" }).Contains(args[0]))
            {
                System.Console.WriteLine("Give as the only parameter the time difference in hours. For example \"SetClock.exe -2\" moves the clock two hours backwards.");
                return;
            }

            double delta = 0;
            try
            {
                delta = Convert.ToDouble(args[0]);
            }
            catch
            {
                System.Console.WriteLine("Error converting input parameter to time difference.");
                return;
            }

            var newDateTime = DateTime.Now.ToUniversalTime().AddHours(delta);
            var newSystemTime = new SYSTEMTIME();
            newSystemTime.wYear = Convert.ToInt16(newDateTime.Year);
            newSystemTime.wMonth = Convert.ToInt16(newDateTime.Month);
            newSystemTime.wDay = Convert.ToInt16(newDateTime.Day);
            newSystemTime.wDayOfWeek = Convert.ToInt16(newDateTime.DayOfWeek);
            newSystemTime.wHour = Convert.ToInt16(newDateTime.Hour);
            newSystemTime.wMinute = Convert.ToInt16(newDateTime.Minute);
            newSystemTime.wSecond = Convert.ToInt16(newDateTime.Second);
            newSystemTime.wMilliseconds = Convert.ToInt16(newDateTime.Millisecond);

            SetSystemTime(ref newSystemTime);
        }

 public static void SetTime(SYSTEMTIME time)
 {
     if (!SetLocalTime(ref time))
     {
         // The native function call failed, so throw an exception
         throw new Win32Exception(Marshal.GetLastWin32Error());
     }
 }

 private void ChangeDateDown(int numDays)
 {
     DateTime t = DateTime.Now.AddDays(-1);
     DateTime h = DateTime.Now.AddHours(0);
     SYSTEMTIME st = new SYSTEMTIME();
     st.FromDateTime(t);
     SetSystemTime(ref st);
 }

        /// <summary>
        /// Gets current system time.
        /// </summary>
        /// <returns></returns>
        public static DateTime GetTime()
        {
            // Call the native GetSystemTime method
            // with the defined structure.
            SYSTEMTIME stime = new SYSTEMTIME();
            GetSystemTime(ref stime);

            var utc = new DateTime(stime.wYear, stime.wMonth, stime.wDay, stime.wHour, stime.wMinute, stime.wSecond, stime.wMilliseconds, DateTimeKind.Utc);
            return utc.ToLocalTime();
        }

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        //
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