使用C#设置系统时间（不同于以往的文章，是经过测试的）

 /// <summary>
 /// form1 的摘要说明。
 /// </summary>
 public class form1 : system.windows.forms.form
 {
    private system.windows.forms.button button1;
    private system.windows.forms.textbox textbox1;
    private system.windows.forms.textbox textbox2;
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private system.componentmodel.container components = null;

  public form1()
  {
   //
   // windows 窗体设计器支持所必需的
   //
   initializecomponent();

   //
   // todo: 在 initializecomponent 调用后添加任何构造函数代码
   //
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.dispose();
    }
   }
   base.dispose( disposing );
  }

  #region windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void initializecomponent()
  {
      this.button1 = new system.windows.forms.button();
      this.textbox1 = new system.windows.forms.textbox();
      this.textbox2 = new system.windows.forms.textbox();
      this.suspendlayout();
      //
      // button1
      //
      this.button1.location = new system.drawing.point(188, 174);
      this.button1.name = "button1";
      this.button1.tabindex = 0;
      this.button1.text = "button1";
      this.button1.click += new system.eventhandler(this.button1_click);
      //
      // textbox1
      //
      this.textbox1.location = new system.drawing.point(56, 12);
      this.textbox1.name = "textbox1";
      this.textbox1.size = new system.drawing.size(510, 21);
      this.textbox1.tabindex = 1;
      this.textbox1.text = "textbox1";
      //
      // textbox2
      //
      this.textbox2.location = new system.drawing.point(58, 50);
      this.textbox2.name = "textbox2";
      this.textbox2.size = new system.drawing.size(506, 21);
      this.textbox2.tabindex = 2;
      this.textbox2.text = "textbox2";
      //
      // form1
      //
      this.autoscalebasesize = new system.drawing.size(6, 14);
      this.clientsize = new system.drawing.size(602, 273);
      this.controls.add(this.textbox2);
      this.controls.add(this.textbox1);
      this.controls.add(this.button1);
      this.name = "form1";
      this.text = "form1";
      this.resumelayout(false);

    }
  #endregion

  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [stathread]
  static void main()
  {
   application.run(new form1());
  }

    private void button1_click(object sender, system.eventargs e)
    {
      textbox1.text = datetime.now.tolongdatestring() + datetime.now.tolongtimestring();
      systemtime systime = new systemtime();

      systime.wyear = convert.touint16(datetime.now.year);
      systime.wmonth = convert.touint16(datetime.now.month);
      //处置北京时间
      int nbeijinghour = datetime.now.hour - 8;
      if (nbeijinghour <= 0)
      {
        nbeijinghour += 24;
        systime.wday= convert.touint16(datetime.now.day - 1);
        systime.wdayofweek = convert.touint16(datetime.now.dayofweek - 1);
      }
      else
      {
        systime.wday= convert.touint16(datetime.now.day);
        systime.wdayofweek = convert.touint16(datetime.now.dayofweek);
      }
      systime.whour = convert.touint16(nbeijinghour);
      systime.wminute = convert.touint16(datetime.now.minute);
      systime.wsecond = convert.touint16(datetime.now.second);
      systime.wmiliseconds = convert.touint16(datetime.now.millisecond);
 
      win32.setsystemtime(ref systime);
      textbox2.text = datetime.now.tolongdatestring() + datetime.now.tolongtimestring();
    }

 }
}