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).

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.DateTime;
import com.chilkatsoft.chilkat2.Socket;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Socket socket = new Socket();

        // Connect to an NIST time server and read the current date/time
        int maxWaitMs = 4000;
        boolean useTls = false;
        try {
            socket.connect("time-c.nist.gov", 37, useTls, maxWaitMs);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            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;
        try {
            socket.receiveInt32(bigEndian);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        DateTime dt = new DateTime();
        dt.setFromNtpTime(socket.getReceivedInt());

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

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