C#获取互联网时间
1 public static class TimeHelper 2 { 3 // 小端存储与大端存储的转换 4 private static uint swapEndian(ulong x) 5 { 6 return (uint)(((x & 0x000000ff) << 24) + 7 ((x & 0x0000ff00) << 8) + 8 ((x & 0x00ff0000) >> 8) + 9 ((x & 0xff000000) >> 24)); 10 } 11 12 // 方法1、获取NTP网络时间 13 public static DateTime getWebTime() 14 { 15 // default ntp server 16 const string ntpServer = "ntp1.aliyun.com"; 17 18 // NTP message size - 16 bytes of the digest (RFC 2030) 19 byte[] ntpData = new byte[48]; 20 // Setting the Leap Indicator, Version Number and Mode values 21 ntpData[0] = 0x1B; // LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode) 22 23 IPAddress[] addresses = Dns.GetHostEntry(ntpServer).AddressList; 24 foreach (var item in addresses) 25 { 26 Debug.WriteLine("IP:" + item); 27 } 28 29 // The UDP port number assigned to NTP is 123 30 IPEndPoint ipEndPoint = new IPEndPoint(addresses[0], 123); 31 32 // NTP uses UDP 33 Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); 34 socket.Connect(ipEndPoint); 35 // Stops code hang if NTP is blocked 36 socket.ReceiveTimeout = 3000; 37 socket.Send(ntpData); 38 socket.Receive(ntpData); 39 socket.Close(); 40 41 // Offset to get to the "Transmit Timestamp" field (time at which the reply 42 // departed the server for the client, in 64-bit timestamp format." 43 const byte serverReplyTime = 40; 44 // Get the seconds part 45 ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime); 46 // Get the seconds fraction 47 ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime + 4); 48 // Convert From big-endian to little-endian 49 intPart = swapEndian(intPart); 50 fractPart = swapEndian(fractPart); 51 ulong milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000UL); 52 53 // UTC time 54 DateTime webTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds(milliseconds); 55 // Local time 56 return webTime.ToLocalTime(); 57 } 58 59 //方法2、获取ntp时间 60 public static DateTime DataStandardTime()//使用时，将static 关键字删除，在其它位置方可使用?2010-11-24 61 {//返回国际标准时间 62 //只使用的TimerServer的IP地址，未使用域名 63 string[,] TimerServer = new string[14, 2]; 64 int[] ServerTab = new int[] { 3, 2, 4, 8, 9, 6, 11, 5, 10, 0, 1, 7, 12 }; 65 66 TimerServer[0, 0] = "time-a.nist.gov"; 67 TimerServer[0, 1] = "129.6.15.28"; 68 TimerServer[1, 0] = "time-b.nist.gov"; 69 TimerServer[1, 1] = "129.6.15.29"; 70 TimerServer[2, 0] = "time-a.timefreq.bldrdoc.gov"; 71 TimerServer[2, 1] = "132.163.4.101"; 72 TimerServer[3, 0] = "time-b.timefreq.bldrdoc.gov"; 73 TimerServer[3, 1] = "132.163.4.102"; 74 TimerServer[4, 0] = "time-c.timefreq.bldrdoc.gov"; 75 TimerServer[4, 1] = "132.163.4.103"; 76 TimerServer[5, 0] = "utcnist.colorado.edu"; 77 TimerServer[5, 1] = "128.138.140.44"; 78 TimerServer[6, 0] = "time.nist.gov"; 79 TimerServer[6, 1] = "192.43.244.18"; 80 TimerServer[7, 0] = "time-nw.nist.gov"; 81 TimerServer[7, 1] = "131.107.1.10"; 82 TimerServer[8, 0] = "nist1.symmetricom.com"; 83 TimerServer[8, 1] = "69.25.96.13"; 84 TimerServer[9, 0] = "nist1-dc.glassey.com"; 85 TimerServer[9, 1] = "216.200.93.8"; 86 TimerServer[10, 0] = "nist1-ny.glassey.com"; 87 TimerServer[10, 1] = "208.184.49.9"; 88 TimerServer[11, 0] = "nist1-sj.glassey.com"; 89 TimerServer[11, 1] = "207.126.98.204"; 90 TimerServer[12, 0] = "nist1.aol-ca.truetime.com"; 91 TimerServer[12, 1] = "207.200.81.113"; 92 TimerServer[13, 0] = "nist1.aol-va.truetime.com"; 93 TimerServer[13, 1] = "64.236.96.53"; 94 int portNum = 13; 95 string hostName; 96 byte[] bytes = new byte[1024]; 97 int bytesRead = 0; 98 System.Net.Sockets.TcpClient client = new System.Net.Sockets.TcpClient(); 99 for (int i = 0; i < 13; i++) 100 { 101 hostName = TimerServer[ServerTab[i], 0]; 102 103 Debug.WriteLine("hostName:" + hostName); 104 try 105 { 106 client.Connect(hostName, portNum); 107 108 System.Net.Sockets.NetworkStream ns = client.GetStream(); 109 bytesRead = ns.Read(bytes, 0, bytes.Length); 110 client.Close(); 111 break; 112 } 113 catch (System.Exception) 114 { 115 Debug.WriteLine("错误！"); 116 } 117 } 118 char[] sp = new char[1]; 119 sp[0] = ' '; 120 System.DateTime dt = new DateTime(); 121 string str1; 122 str1 = System.Text.Encoding.ASCII.GetString(bytes, 0, bytesRead); 123 Debug.WriteLine("ntp time:" + str1); 124 125 string[] s; 126 s = str1.Split(sp); 127 dt = System.DateTime.Parse(s[1] + " " + s[2]);//得到标准时间 128 Debug.WriteLine("get:" + dt.ToShortTimeString()); 129 //dt=dt.AddHours (8);//得到北京时间*/ 130 return dt; 131 132 } 133 134 //方法3、获取网页时间 135 136 //Bdpagetype:2 137 //Bdqid:0xaff4e50f00011b53 138 //Cache-Control:private 139 //Connection:Keep-Alive 140 //Content-Encoding:gzip 141 //Content-Type:text/html;charset=utf-8 142 //Date:Tue, 23 Oct 2018 03:24:38 GMTv 143 public static string GetNetDateTime() 144 { 145 WebRequest request = null; 146 WebResponse response = null; 147 WebHeaderCollection headerCollection = null; 148 string datetime = string.Empty; 149 try 150 { 151 request = WebRequest.Create("https://www.baidu.com"); 152 request.Timeout = 1000; 153 request.Credentials = CredentialCache.DefaultCredentials; 154 response = (WebResponse)request.GetResponse(); 155 headerCollection = response.Headers; 156 foreach (var h in headerCollection.AllKeys) 157 { if (h == "Date") { datetime = headerCollection[h]; } } 158 return datetime; 159 } 160 catch (Exception) { return datetime; } 161 finally 162 { 163 if (request != null) 164 { request.Abort(); } 165 if (response != null) 166 { response.Close(); } 167 if (headerCollection != null) 168 { headerCollection.Clear(); } 169 } 170 } 171 172 }
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