设置系统时间

 /// <summary>
        /// Sets the current local time and date.
        /// </summary>
        /// <param name="lpSystemTime"></param>
        /// <returns></returns>
        [DllImport("kernel32", CharSet = CharSet.Unicode, SetLastError = true)]
        public static extern int SetLocalTime(ref SYSTEMTIME lpSystemTime);
        //创建时间结构体 
        public struct SYSTEMTIME
        {
            public short wYear;
            public short wMonth;
            public short wDayOfWeek;
            public short wDay;
            public short wHour;
            public short wMinute;
            public short wSecond;
            public short wMilliseconds;
        } 
        private void Set_Click(object sender, EventArgs e)
        {           
            SystemTime systNew = new SystemTime();
            // 设置属性 
            systNew.wDay = (short)dateTimePicker1.Value.Day;//日期
            systNew.wMonth = (short)dateTimePicker1.Value.Month;//月
            systNew.wYear = (short)dateTimePicker1.Value.Year;//年
            systNew.wHour = (short)dateTimePicker1.Value.Hour;//小时
            systNew.wMinute = (short)dateTimePicker1.Value.Minute;//分
            systNew.wSecond = (short)dateTimePicker1.Value.Second; //秒
            // 调用API，更新系统时间 
            SetLocalTime(ref systNew); 
        }