设置系统时间

1 添加timer 和 Datapicker 控件；
 
2

using System.Data;
 using System.Runtime.InteropServices;

 
3。

[DllImport( "Kernel32.dll" )]
   public static extern void GetLocalTime(SystemTime st );
   
   [DllImport( "Kernel32.dll" )]
   public static extern void SetLocalTime(SystemTime st );
  
   [StructLayout( LayoutKind.Sequential)]
   
  
   public class 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; 
   }

 
4

private void timer1_Tick(object sender, System.EventArgs e)
   {
    SystemTime st = new SystemTime();
    GetLocalTime(st);
    this.Text="The Date and Time is: " ;
    this.Text=this.Text+st.wHour.ToString()+":";
    this.Text=this.Text+st.wMinute.ToString()+":";
    this.Text=this.Text+st.wSecond.ToString()+".";
    this.Text=this.Text+st.wMilliseconds.ToString();
   }
  
  
  
   private void Form1_Load(object sender, System.EventArgs e)
   {
    this.timer1.Interval=100;
    this.timer1.Enabled=true;
    this.dateTimePicker1.Value=DateTime.Now;
   }
  
  
 //设置按钮
   private void button1_Click(object sender, System.EventArgs e)
   {
    SystemTime st = new SystemTime();
    st.wYear=(ushort)this.dateTimePicker1.Value.Year;
    st.wMonth=(ushort)this.dateTimePicker1.Value.Month;
    st.wDay=(ushort)this.dateTimePicker1.Value.Day;
    st.wHour=(ushort)this.dateTimePicker1.Value.Hour;
    st.wMinute=(ushort)this.dateTimePicker1.Value.Minute;
    st.wSecond=(ushort)this.dateTimePicker1.Value.Second;
    SetLocalTime(st);  }