获得时间服务器的时间

/// <summary>
        /// 获得服务器的时间
        /// </summary>
        /// <returns></returns>
        private DateTime GetRemoteServerTime()
        {

            DateTime official, localtime = DateTime.Now;
            string returndata = null;
            string[] dates = new string[4];
            string[] times = new string[4];
            string[] tokens = new string[11];

            TcpClient tcpclient = new TcpClient();
            try
            {
                while (!tcpclient.Connected)
                    tcpclient.Connect(IPAddress.Parse("203.117.180.36"), 13);
                NetworkStream networkStream = tcpclient.GetStream();

                if (networkStream.CanWrite && networkStream.CanRead)
                {
                    Byte[] sendBytes = Encoding.ASCII.GetBytes("Hello ");
                    networkStream.Write(sendBytes, 0, sendBytes.Length);
                    byte[] bytes = new byte[tcpclient.ReceiveBufferSize];
                    networkStream.Read(bytes, 0, (int)tcpclient.ReceiveBufferSize);
                    returndata = Encoding.ASCII.GetString(bytes);
                }
                tcpclient.Close();
            }
            catch (Exception excep)
            {
                MessageBox.Show(excep.ToString());
            }
            if (returndata != null)
            {
                tokens = returndata.Split(' ');
                dates = tokens[1].Split('-');
                times = tokens[2].Split(':');

                official = new DateTime(Int32.Parse(dates[0]) + 2000, Int32.Parse(dates[1]), Int32.Parse(dates[2]),
                       Int32.Parse(times[0]), Int32.Parse(times[1]), Int32.Parse(times[2]));
                localtime = TimeZone.CurrentTimeZone.ToLocalTime(official);
            }
            return localtime;
        }