How to implement system time change in Windows Service in C#?

Question

API

Good afternoon!
Faced a problem when writing a service for Windows. The service must reset the system time to its original value.
There is a code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Timers;
using System.Runtime.InteropServices; 

namespace WindowsService1
{
    static class Program
    {
        [StructLayout(LayoutKind.Sequential)]

        private struct SYSTEMTIME                                                           //описываем переменную
        {
            public ushort wYear;
            public ushort wMonth;
            public ushort wDayOfWeek;
            public ushort wDay;
            public ushort wHour;
            public ushort wMinute;
            public ushort wSecond;
            public ushort wMilliseconds;
        }

        [DllImport("kernel32.dll", EntryPoint = "GetSystemTime", SetLastError = true)]
        private extern static void Win32GetSystemTime(ref SYSTEMTIME lpSystemTime);         //импортируем kernel32.dll и создаем переменную запроса времени из системы

        [DllImport("kernel32.dll", EntryPoint = "SetSystemTime", SetLastError = true)]
        private extern static bool Win32SetSystemTime(ref SYSTEMTIME lpSystemTime);         //импортируем kernel32.dll и создаем переменную запроса на запись времени на систему


        private static System.Timers.Timer TimeCycle;                                       //создаем таймер
        static void Main()
        {
            ServiceBase[] ServicesToRun;
            ServicesToRun = new ServiceBase[] 
      { 
        new TimeCycleService() 
      };
            ServiceBase.Run(ServicesToRun);

        }

private static void Cycle()
        {
            TimeCycle = new Timer();        //создаем таймер
            TimeCycle.Interval = 180000;    //время таймера 3 минуты
            TimeCycle.Enabled = true;       //включаем таймер
            TimeCycle.Elapsed += Time;      //по окончанию взываем событие
            TimeCycle.AutoReset = true;     //указываем авторестарт для таймера
        }

        private static void Time(Object source, ElapsedEventArgs e)
        {
            SYSTEMTIME time = new SYSTEMTIME();         //создаем переменную
            Win32GetSystemTime(ref time);               //получаем системное время
            time.wMinute = (ushort)(time.wMinute -3);   //от существующего времени отнимаем 3 минуты
            Win32SetSystemTime(ref time);               //записываем время в систему
        }
    }
}

When the server starts, the time does not change, somewhere I made a mistake or did not take into account the features of building the code for the service. Why exactly - I couldn’t find it myself, the service is started on behalf of LocalService and autostart, no one can tell where the mistake was made?
Thank you for your attention!

Answer 1

And if you change from the application, it turns out? Here , for some reason, other functions are used.

Answer 2

I found an error - I didn't format the code correctly.
The code itself needs to be written into the service form with the registration of events, start / stop / restart, etc.
At me the initializing service has been written down in the code.