C#net 批改系统时间

C#.net 修改系统时间
新建一个类文件SystemDateTime.cs：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Runtime.InteropServices;namespace setDateTime{    class SystemDateTime    {        [DllImport("Kernel32.dll")]        public static extern bool SetLocalTime(ref SystemTime sysTime);        [DllImport("Kernel32.dll")]        public static extern void GetLocalTime(ref SystemTime sysTime);    }    [StructLayout(LayoutKind.Sequential)]    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 wMiliseconds;    }}

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace setDateTime{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            DateTime dt = DateTime.Now.AddDays(-5);            this.Text = Form1.SetSysTime(dt).ToString();        }        public static bool SetSysTime(DateTime newdatetime)        {            SystemTime st = new SystemTime();            st.wYear = (ushort)(newdatetime.Year - 1);            st.wMonth = (ushort)newdatetime.Month;            st.wDayOfWeek = (ushort)3;            st.wDay = (ushort)newdatetime.Day;            st.wHour = (ushort)(newdatetime.Hour - 2);            st.wMinute = (ushort)newdatetime.Minute;            st.wSecond = (ushort)newdatetime.Second;            st.wMiliseconds = (ushort)newdatetime.Millisecond;            return SystemDateTime.SetLocalTime(ref st);        }    }}