C#获取获取北京时间多种方法

#region 获取网络时间
///<summary>
/// 获取中国国家授时中心网络服务器时间发布的当前时间
///</summary>
///<returns></returns>
publicstatic DateTime GetChineseDateTime()
{
DateTime res = DateTime.MinValue;
try
{
string url ="http://www.time.ac.cn/stime.asp";
HttpHelper helper =new HttpHelper();
helper.Encoding = Encoding.Default;
string html = helper.GetHtml(url);
string patDt =@"d{4}年d{1,2}月d{1,2}日";
string patHr =@"hrss+=s+d{1,2}";
string patMn =@"mins+=s+d{1,2}";
string patSc =@"secs+=s+d{1,2}";
Regex regDt =new Regex(patDt);
Regex regHr =new Regex(patHr);
Regex regMn =new Regex(patMn);
Regex regSc =new Regex(patSc);

res = DateTime.Parse(regDt.Match(html).Value);
int hr = GetInt(regHr.Match(html).Value, false);
int mn = GetInt(regMn.Match(html).Value, false);
int sc = GetInt(regSc.Match(html).Value, false);
res = res.AddHours(hr).AddMinutes(mn).AddSeconds(sc);
}
catch { }
return res;
}

///<summary>
/// 从指定的字符串中获取整数
///</summary>
///<param name="origin">原始的字符串</param>
///<param name="fullMatch">是否完全匹配，若为false，则返回字符串中的第一个整数数字</param>
///<returns>整数数字</returns>
privatestaticint GetInt(string origin, bool fullMatch)
{
if (string.IsNullOrEmpty(origin))
{
return0;
}
origin = origin.Trim();
if (!fullMatch)
{
string pat =@"-?d+";
Regex reg =new Regex(pat);
origin = reg.Match(origin.Trim()).Value;
}
int res =0;
int.TryParse(origin, out res);
return res;
}
#endregion

///<summary>
/// 获取标准北京时间1
///</summary>
///<returns></returns>
publicstatic DateTime GetStandardTime()
{
//<?xml version="1.0" encoding="GB2312" ?>
//- <ntsc>
//- <time>
// <year>2011</year>
// <month>7</month>
// <day>10</day>
// <Weekday />
// <hour>19</hour>
// <minite>45</minite>
// <second>37</second>
// <Millisecond />
// </time>
// </ntsc>
DateTime dt;
WebRequest wrt =null;
WebResponse wrp =null;
try
{
wrt = WebRequest.Create("http://www.time.ac.cn/timeflash.asp?user=flash");
wrt.Credentials = CredentialCache.DefaultCredentials;

wrp = wrt.GetResponse();
StreamReader sr =new StreamReader(wrp.GetResponseStream(), Encoding.UTF8);
string html = sr.ReadToEnd();

sr.Close();
wrp.Close();

int yearIndex = html.IndexOf("<year>") +6;
int monthIndex = html.IndexOf("<month>") +7;
int dayIndex = html.IndexOf("<day>") +5;
int hourIndex = html.IndexOf("<hour>") +6;
int miniteIndex = html.IndexOf("<minite>") +8;
int secondIndex = html.IndexOf("<second>") +8;

string year = html.Substring(yearIndex, html.IndexOf("</year>") - yearIndex);
string month = html.Substring(monthIndex, html.IndexOf("</month>") - monthIndex); ;
string day = html.Substring(dayIndex, html.IndexOf("</day>") - dayIndex);
string hour = html.Substring(hourIndex, html.IndexOf("</hour>") - hourIndex);
string minite = html.Substring(miniteIndex, html.IndexOf("</minite>") - miniteIndex);
string second = html.Substring(secondIndex, html.IndexOf("</second>") - secondIndex);
dt = DateTime.Parse(year +"-"+ month +"-"+ day +""+ hour +":"+ minite +":"+ second);
}
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();
}
return dt;
}

///<summary>
/// 获取标准北京时间2
///</summary>
///<returns></returns>
publicstatic DateTime GetBeijingTime()
{
//t0 = new Date().getTime();
//nyear = 2011;
//nmonth = 7;
//nday = 5;
//nwday = 2;
//nhrs = 17;
//nmin = 12;
//nsec = 12;
DateTime dt;
WebRequest wrt =null;
WebResponse wrp =null;
try
{
wrt = WebRequest.Create("http://www.beijing-time.org/time.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(" ", "");
}

string year = tempArray[1].Substring(tempArray[1].IndexOf("nyear=") +6);
string month = tempArray[2].Substring(tempArray[2].IndexOf("nmonth=") +7);
string day = tempArray[3].Substring(tempArray[3].IndexOf("nday=") +5);
string hour = tempArray[5].Substring(tempArray[5].IndexOf("nhrs=") +5);
string minite = tempArray[6].Substring(tempArray[6].IndexOf("nmin=") +5);
string second = tempArray[7].Substring(tempArray[7].IndexOf("nsec=") +5);
dt = DateTime.Parse(year +"-"+ month +"-"+ day +""+ hour +":"+ minite +":"+ second);
}
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();
}
return dt;
}

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/// <summary>
/// 获取标准北京时间
/// </summary>
/// <returns></returns>
public static DateTime DataStandardTime()
{
DateTime dt;

//返回国际标准时间
//只使用的时间服务器的IP地址，未使用域名
try
{
string[,] 时间服务器 = new string[14, 2];
int[] 搜索顺序 = new int[] { 3, 2, 4, 8, 9, 6, 11, 5, 10, 0, 1, 7, 12 };
时间服务器[0, 0] = "time-a.nist.gov";
时间服务器[0, 1] = "129.6.15.28";
时间服务器[1, 0] = "time-b.nist.gov";
时间服务器[1, 1] = "129.6.15.29";
时间服务器[2, 0] = "time-a.timefreq.bldrdoc.gov";
时间服务器[2, 1] = "132.163.4.101";
时间服务器[3, 0] = "time-b.timefreq.bldrdoc.gov";
时间服务器[3, 1] = "132.163.4.102";
时间服务器[4, 0] = "time-c.timefreq.bldrdoc.gov";
时间服务器[4, 1] = "132.163.4.103";
时间服务器[5, 0] = "utcnist.colorado.edu";
时间服务器[5, 1] = "128.138.140.44";
时间服务器[6, 0] = "time.nist.gov";
时间服务器[6, 1] = "192.43.244.18";
时间服务器[7, 0] = "time-nw.nist.gov";
时间服务器[7, 1] = "131.107.1.10";
时间服务器[8, 0] = "nist1.symmetricom.com";
时间服务器[8, 1] = "69.25.96.13";
时间服务器[9, 0] = "nist1-dc.glassey.com";
时间服务器[9, 1] = "216.200.93.8";
时间服务器[10, 0] = "nist1-ny.glassey.com";
时间服务器[10, 1] = "208.184.49.9";
时间服务器[11, 0] = "nist1-sj.glassey.com";
时间服务器[11, 1] = "207.126.98.204";
时间服务器[12, 0] = "nist1.aol-ca.truetime.com";
时间服务器[12, 1] = "207.200.81.113";
时间服务器[13, 0] = "nist1.aol-va.truetime.com";
时间服务器[13, 1] = "64.236.96.53";
int portNum = 13;
string hostName;
byte[] bytes = new byte[1024];
int bytesRead = 0;
System.Net.Sockets.TcpClient client = new System.Net.Sockets.TcpClient();
for (int i = 0; i < 13; i++)
{
hostName = 时间服务器[搜索顺序[i], 1];
try
{
client.Connect(hostName, portNum);
System.Net.Sockets.NetworkStream ns = client.GetStream();
bytesRead = ns.Read(bytes, 0, bytes.Length);
client.Close();
break;
}
catch (System.Exception)
{
}
}
char[] sp = new char[1];
sp[0] = ' ';
dt = new DateTime();
string str1;
str1 = System.Text.Encoding.ASCII.GetString(bytes, 0, bytesRead);

string[] s;
s = str1.Split(sp);
if (s.Length >= 2)
{
dt = System.DateTime.Parse(s[1] + " " + s[2]);//得到标准时间
dt = dt.AddHours(8);//得到北京时间*/
}
else
{
dt = DateTime.Parse("2011-1-1");
}
}
catch (Exception)
{
dt = DateTime.Parse("2011-1-1");
}
return dt;
}
按 Ctrl+C 复制代码

DateTime dt = Common.GetBeijingTime();// Common.GetStandardTime();
if (dt.ToString() =="2011-1-1 0:00:00")
{
MessageBox.Show("网络异常，不能启动本程序！");
Application.Exit();
return;
}