/// <summary>
/// Gets the current date and time using the given <see cref="NtpPacket"/>
/// </summary>
/// <param name="ntpPacket">
/// The <see cref="NtpPacket"/> object to use when querying the network time server
/// </param>
/// <param name="host">
/// The hostname of the network time server to connect to
/// </param>
/// <param name="port">
/// The port of the network time server to connect to
/// </param>
/// <returns>
/// The response from the NTP server
/// </returns>
public static NtpPacket Send(NtpPacket ntpPacket, string host = "time.nist.gov", int port = 123)
{
var hostEntry = Dns.GetHostEntry(host);
foreach (var address in hostEntry.AddressList)
{
if (address != null)
{
var ipEndPoint = new IPEndPoint(address, port);
var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
try
{
socket.Connect(ipEndPoint);
socket.Send(ntpPacket.Bytes);
var buffer = new byte[48];
socket.Receive(buffer);
ntpPacket = new NtpPacket(buffer);
}
finally
{
socket.Close();
}
break;
}
}
return ntpPacket;
}
/// <summary>
/// Gets the current date and time
/// </summary>
/// <returns>
/// The current date and time
/// </returns>
public static DateTime GetDateTime()
{
var ntpPacket = new NtpPacket
{
LeapIndicator = LeapIndicator.NoWarning,
Mode = Mode.Client,
VersionNumber = 4
};
return Send(ntpPacket).TransmitTimestamp;
}