c# 修改系统本地时间

1 /**/ /// <summary>
 2 ///系统时间类
 3 /// </summary>
 4  [ StructLayout( LayoutKind.Sequential )]
 5   public   class  SystemTime
 6   {
 7  public ushort year;
 8  public ushort month;
 9  public ushort dayofweek;
10  public ushort day;
11  public ushort hour;
12  public ushort minute;
13  public ushort second;
14  public ushort milliseconds;
15 }
16
17   /**/ /// <summary>
18 /// Windows API方法
19 /// </summary>
20   public   class  WinAPI
21   {
22  [ DllImport( "Kernel32.dll" )]
23  private static extern Boolean SetSystemTime([In,Out] SystemTime st);
24
25  /**//// <summary>
26  /// 设置系统时间
27  /// </summary>
28  /// <param name="newdatetime">新时间</param>
29  /// <returns></returns>
30  public static bool SetSysTime(DateTime newdatetime)
31  {
32   SystemTime st = new SystemTime();
33   st.year    = Convert.ToUInt16(newdatetime.Year);
34   st.month   = Convert.ToUInt16(newdatetime.Month);
35   st.day    = Convert.ToUInt16(newdatetime.Day);
36   st.dayofweek  = Convert.ToUInt16(newdatetime.DayOfWeek);
37   st.hour    = Convert.ToUInt16(newdatetime.Hour - TimeZone.CurrentTimeZone.GetUtcOffset(new DateTime(2001,09,01)).Hours);
38   st.minute   = Convert.ToUInt16(newdatetime.Minute);
39   st.second   = Convert.ToUInt16(newdatetime.Second);
40   st.milliseconds  = Convert.ToUInt16(newdatetime.Millisecond);
41   return SetSystemTime(st);
42  }
43 }  
44