Java

Get Current Date/Time from NIST Time Server

See more Socket/SSL/TLS Examples

Demonstrates using Chilkat Socket to connect to an NIST time server and (using the old Time Protocol (RFC 868)), will read the current GMT time.

Note: This is not necessarily the very best means for getting the current date/time. The most commonly used time protocol is the Network Time Protocol (RFC-1305).

Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSocket socket = new CkSocket();

    // Connect to an NIST time server and read the current date/time
    int maxWaitMs = 4000;
    boolean useTls = false;
    success = socket.Connect("time-c.nist.gov",37,useTls,maxWaitMs);
    if (success != true) {
        System.out.println(socket.lastErrorText());
        return;
        }

    // The time server will send a big-endian 32-bit integer representing
    // the number of seconds since since 00:00 (midnight) 1 January 1900 GMT.
    // The ReceiveInt32 method will receive a 4-byte integer, but returns
    // true or false to indicate success.  If successful, the integer
    // is obtained via the ReceivedInt property.
    boolean bigEndian = true;
    success = socket.ReceiveInt32(bigEndian);
    if (success != true) {
        System.out.println(socket.lastErrorText());
        return;
        }

    CkDateTime dt = new CkDateTime();
    dt.SetFromNtpTime(socket.get_ReceivedInt());

    // Show the current local date/time
    boolean bLocalTime = true;
    System.out.println("Current local date/time: " + dt.getAsRfc822(bLocalTime));

    maxWaitMs = 10;
    socket.Close(maxWaitMs);
  }
}