c# 修改系统时间

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
 
namespace WindowsFormsApp2
{
    /// 

    /// by wgscd
    /// 
    public struct SYSTEMTIME
    {
        public ushort wYear;
        public ushort wMonth;
        public ushort wDayOfWeek;
        public ushort wDay;
        public ushort wHour;
        public ushort wMinute;
        public ushort wSecond;
        public ushort wMilliseconds;

        /// 

        /// 从System.DateTime转换。
        /// 
        /// System.DateTime类型的时间。
        public void FromDateTime(DateTime time)
        {
            wYear = (ushort)time.Year;
            wMonth = (ushort)time.Month;
            wDayOfWeek = (ushort)time.DayOfWeek;
            wDay = (ushort)time.Day;
            wHour = (ushort)time.Hour;
            wMinute = (ushort)time.Minute;
            wSecond = (ushort)time.Second;
            wMilliseconds = (ushort)time.Millisecond;
        }
        /// 

        /// 转换为System.DateTime类型。
        /// 
        /// 
        public DateTime ToDateTime()
        {
            return new DateTime(wYear, wMonth, wDay, wHour, wMinute, wSecond, wMilliseconds);
        }
        /// 

        /// 静态方法。转换为System.DateTime类型。
        /// 
        /// SYSTEMTIME类型的时间。
        /// 
        public static DateTime ToDateTime(SYSTEMTIME time)
        {
            return time.ToDateTime();
        }
    }
    public class Win32API
    {
        [DllImport("Kernel32.dll")]
         static extern bool SetLocalTime(ref SYSTEMTIME Time);
        [DllImport("Kernel32.dll")]
         static extern void GetLocalTime(ref SYSTEMTIME Time);
        public  static void  SetDatetime(DateTime t)
        {
            
            //转换System.DateTime到SYSTEMTIME
            SYSTEMTIME st = new SYSTEMTIME();
            st.FromDateTime(t);
            //调用Win32 API设置系统时间
            Win32API.SetLocalTime(ref st);

        }


    }
}