获取北京时间，矫正电脑系统时间的有关问题

获取北京时间，矫正电脑系统时间的问题
我把程序放在wen7的电脑上运行，可以进行矫正电脑系统时间，但是我把程序放在wen8.1的电脑上运行，就不能进行矫正电脑系统时间，为什么呢



namespace 淘宝整点秒杀助手
{
     
    public partial class Form1 : Form
    {
        [DllImport("kernel32.dll")]
        private static extern bool SetLocalTime(ref SYSTEMTIME time);
        [StructLayout(LayoutKind.Sequential)]
        private struct SYSTEMTIME
        {
            public short year;
            public short month;
            public short dayOfWeek;
            public short day;
            public short hour;
            public short minute;
            public short second;
            public short milliseconds;
        }
        public Form1()
        {
            InitializeComponent();
            webBrowser1.Url = new System.Uri("http://ju.taobao.com/tg/point_list.htm?spm=1.7274553.754904965.d9.4ONjTD");
          //  GetBeijingTime();
        }
        
        
        private void button1_Click(object sender, EventArgs e)
        {
             comboBox1.Enabled=false;
             timer1.Enabled = true;
       

            }

        private void button2_Click(object sender, EventArgs e)
        {

            GetBeijingTime();
            MessageBox.Show("时间矫正完成！", "温馨提示");
        }

        private void button3_Click(object sender, EventArgs e)
        {
            comboBox1.Enabled = true;
        }
       // 获取网络时间
        public DateTime GetBeijingTime()
        {

            DateTime dt;
            WebRequest wrt = null;
            WebResponse wrp = null;
            try
            {
                wrt = WebRequest.Create("http://www.beijing-time.org/time15.asp");
                wrp = wrt.GetResponse();

                string html = string.Empty;
               
                using (Stream stream = wrp.GetResponseStream())
                {
                    using (StreamReader sr = new StreamReader(stream, Encoding.UTF8))
                    {
                        html = sr.ReadToEnd();

                    }
                }

                string[] tempArray = html.Split(';');
                for (int i = 0; i < tempArray.Length; i++)
                {
                    tempArray[i] = tempArray[i].Replace("\r\n", "");
                }

                string year = tempArray[1].Split('=')[1];
                string month = tempArray[2].Split('=')[1];
                string day = tempArray[3].Split('=')[1];
                string hour = tempArray[5].Split('=')[1];
                string minite = tempArray[6].Split('=')[1];
                string second = tempArray[7].Split('=')[1];

                dt = DateTime.Parse(year + "-" + month + "-" + day + " " + hour + ":"

+ minite + ":" + second);

                // label1.Text = dt.ToString();
                SYSTEMTIME st;
                st.year = (short)dt.Year;
                st.month = (short)dt.Month;
                st.dayOfWeek = (short)dt.DayOfWeek;
                st.day = (short)dt.Day;
                st.hour = (short)dt.Hour;
                st.minute = (short)dt.Minute;
                st.second = (short)dt.Second;
                st.milliseconds = (short)dt.Millisecond;
                SetLocalTime(ref st);
            }
            catch (WebException)
            {
                return DateTime.Parse("2011-1-1");
            }
            catch (Exception)
            {
                return DateTime.Parse("2011-1-1");
            }
            finally
            {
                if (wrp != null)
                    wrp.Close();
                if (wrt != null)
                    wrt.Abort();
            }
          //  timer1.Enabled = true;
            return dt;

        }
       
    //定时比对时间
        private void timer1_Tick_1(object sender, EventArgs e)
        {
            if (comboBox1.Text == DateTime.Now.ToString("hh")) {

                  foreach (HtmlElement element in webBrowser1.Document.GetElementsByTagName("button"))
                  {
                      if (element.GetAttribute("ClassName") == "buyaction J_BuySubmit")
                      {
                          element.InvokeMember("Click");
                          timer1.Enabled =false;
                          break;
                      }
                  }
            };
        }
       //设置在本窗体中加载
        private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {       //将所有的链接的目标，指向本窗体 
            foreach (HtmlElement archor in this.webBrowser1.Document.Links)
            {
                archor.SetAttribute("target", "_self");
            } 
            //将所有的FORM的提交目标，指向本窗体 
            foreach (HtmlElement form in this.webBrowser1.Document.Forms)
            {
                form.SetAttribute("target", "_self"); 
            } 

        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
 }
}
------解决思路----------------------
win7是不是关掉了UAC，win8没关？
win8里右键你的程序，以管理员方式启动之后能行么？