改变系统时间c#

    //两种方法，但都需要 run as admin
    [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 static class SetOSDateTime
    {
        [DllImport("Kernel32.dll")]
        public static extern bool SetLocalTime(ref SystemTime sysTime);
        /// <summary>
        /// 
        /// </summary>
        /// <param name="time">2013-11-18</param>
        /// <returns></returns>
        public static bool SetByAPI(string time)
        {
            bool flag = false;
            SystemTime sysTime = new SystemTime();
            DateTime dt = Convert.ToDateTime(time);
            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 = SetOSDateTime.SetLocalTime(ref sysTime);
            }
            catch (Exception e)
            {
                Console.WriteLine("SetSystemDateTime函数执行异常" + e.Message);
            }
            return flag;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="time">02-20-2014</param>
        public static void SetByProcess(string time)
        {
            Process p = new Process();
            p.StartInfo.FileName = "cmd.exe";
            p.StartInfo.Arguments = "/c date 02-20-2014";
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.CreateNoWindow = true;
            p.Start();
            //return p.StandardOutput.ReadToEnd(); 
        }
    }