C# 設定系統時間

[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;
    }
   public class SetSystemDateTime
    {
       [DllImport("Kernel32.dll")]
       public static extern bool SetLocalTime(ref SystemTime sysTime);

       public static bool SetLocalTimeByStr(string timestr)
       {
           bool flag = false;
           SystemTime sysTime = new SystemTime();
           DateTime dt = Convert.ToDateTime(timestr);
           sysTime.wYear = Convert.ToUInt16(dt.Year);
           sysTime.wMonth = Convert.ToUInt16(dt.Month);
           sysTime.wDay = Convert.ToUInt16(dt.Day);
           sysTime.wHour = Convert.ToUInt16(dt.Hour);
           sysTime.wMinute = Convert.ToUInt16(dt.Minute);
           sysTime.wSecond = Convert.ToUInt16(dt.Second);
           try
           {
               flag = SetSystemDateTime.SetLocalTime(ref sysTime);
           }
           catch (Exception e)
           {
               Console.WriteLine("SetSystemDateTime函数执行异常" + e.Message);
           }
           return flag;
       }
    }