using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
 
namespace ConsoleApplication1
{
 
 class Program
 {
  static void Main(string[] args)
  {
   Console.WriteLine( GetBeiJingTime());
   Console.ReadKey();
  }
 
  public static string GetBeiJingTime()
  {
   bool isget = false;
   string result = string.Empty;
   try
   {
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://open.baidu.com/special/time/");//百度北京時間地址
    req.Headers.Add("content", "text/html; charset=gbk");
    HttpWebResponse res = (HttpWebResponse)req.GetResponse();
    Stream stream = res.GetResponseStream();
    StreamReader sr = new StreamReader(stream, Encoding.GetEncoding("gbk"));
    string html = sr.ReadToEnd();
    Func<string,string> f1 = (p) =>{
     Regex reg = new Regex("(?<=baidu_time\\().*?(?=\\))");
     return reg.Matches(p)[0].Value;};
    string time = f1(html).Substring(0, 10);//這里是時間戳
    stream.Dispose();
    sr.Dispose();
    DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
    long lTime = long.Parse(time + "0000000");
    TimeSpan toNow = new TimeSpan(lTime);
    result = dtStart.Add(toNow).ToString("yyyyMMdd");
    isget = true;
   }
   catch (Exception)
   {
   }
   finally
   {
    if (!isget)result = "19700101";//如果沒有網絡就返回默認
   }
   return result;
  }
 }
 
}