C#实现设置系统时间

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using System; using System.Runtime.InteropServices; using System.Windows.Forms;   namespace Demo {     public partial class 设置系统时间 : Form     {         public 设置系统时间()         {             InitializeComponent();         }           private void btnSetting_Click(object sender, EventArgs e)         {             //取得当前系统时间             DateTime t = DateTime.Now;             //在当前时间上加上一周             t = t.AddDays(7);               t = DateTime.Parse(this.dtpTime.Text);               //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);             //显示当前时间            // MessageBox.Show(DateTime.Now.ToString());           }     }       /// <summary>     ///     /// </summary>     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;           /// <summary>         /// 从System.DateTime转换。         /// </summary>         /// <param name="time">System.DateTime类型的时间。</param>         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;         }         /// <summary>         /// 转换为System.DateTime类型。         /// </summary>         /// <returns></returns>         public DateTime ToDateTime()         {             return new DateTime(wYear, wMonth, wDay, wHour, wMinute, wSecond, wMilliseconds);         }         /// <summary>         /// 静态方法。转换为System.DateTime类型。         /// </summary>         /// <param name="time">SYSTEMTIME类型的时间。</param>         /// <returns></returns>         public static DateTime ToDateTime(SYSTEMTIME time)         {             return time.ToDateTime();         }     }     public class Win32API     {         [DllImport("Kernel32.dll")]         public static extern bool SetLocalTime(ref SYSTEMTIME Time);         [DllImport("Kernel32.dll")]         public static extern void GetLocalTime(ref SYSTEMTIME Time);     }   }