.NET实现获取NTP服务器时间并同步(附带Windows系统启用NTP服务功能)

static void Main(string[] args) {     string ntpServer = "ip";     Console.WriteLine($"当前时间:rn{ DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss ms")}");     DateTime time = NtpClient.GetNtpServerTime(ntpServer);     Console.WriteLine($"获取到的时间为:rn {time.ToString("yyyy/MM/dd HH:mm:ss ms")}");     NtpClient.SetSystemTime(time);     Console.WriteLine($"更改后的系统时间:rn{ DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss ms")}");     Console.ReadLine(); }

 1 /// <summary>  2 /// 获取NTP服务器的时间。  3 /// Retrieves the time from an NTP server.  4 /// </summary>  5 /// <param name="ntpServer">NTP服务器地址 | NTP server address</param>'  6 /// <param name="ntpPort">NTP服务的端口 | NTP service port</param>  7 /// <returns>服务器时间 | Server time</returns>  8 public static DateTime GetNtpServerTime(string ntpServer,int ntpPort=123)  9 { 10     // 初始化NTP数据缓冲区 11     // Initialize NTP data buffer 12     byte[] ntpData = new byte[NtpDataLength]; 13     ntpData[0] = 0x1B; // NTP version number (3) and mode (3), client request 14  15     var addresses = Dns.GetHostAddresses(ntpServer); 16     IPEndPoint ipEndPoint = new IPEndPoint(addresses[0], ntpPort); 17  18     using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp)) 19     { 20         socket.Connect(ipEndPoint); 21         socket.Send(ntpData); 22         socket.Receive(ntpData); 23     } 24  25     // 从字节40和44提取时间戳 26     // Extract timestamp from bytes 40 and 44 27     ulong intPart = BitConverter.ToUInt32(ntpData, 40); 28     ulong fractPart = BitConverter.ToUInt32(ntpData, 44); 29  30     // 转换字节序为小端格式 31     // Convert byte order to little endian 32     intPart = SwapEndianness(intPart); 33     fractPart = SwapEndianness(fractPart); 34  35     var milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000L); 36  37     // NTP时间是从1900年开始计算的，这里将其转换为UTC时间 38     // NTP time starts from 1900, this converts it to UTC DateTime 39     DateTime networkDateTime = new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddMilliseconds((long)milliseconds); 40  41     return networkDateTime.ToLocalTime(); 42 }