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Code:



 

import java.net.*;

import java.io.*;

import java.util.*;



public class TimeClient {



  public final static int DEFAULT_PORT = 37;



  public static void main(String[] args) {



    String hostname;

    int port = DEFAULT_PORT;



    if (args.length > 0) {

      hostname = args[0];

    }

    else {

      hostname = "tock.usno.navy.mil";

    }



    if (args.length > 1) {

      try {

        port = Integer.parseInt(args[1]);

      }

      catch (NumberFormatException e) {

      }

    }



    // The time protocol sets the epoch at 1900,

    // the java Date class at 1970. This number

    // converts between them.



    long differenceBetweenEpochs = 2208988800L;



    // If you'd rather not use the magic number uncomment

    // the following section which calculates it directly.



    /*

    TimeZone gmt = TimeZone.getTimeZone("GMT");

    Calendar epoch1900 = Calendar.getInstance(gmt);

    epoch1900.set(1900, 01, 01, 00, 00, 00);

    long epoch1900ms = epoch1900.getTime().getTime();

    Calendar epoch1970 = Calendar.getInstance(gmt);

    epoch1970.set(1970, 01, 01, 00, 00, 00);

    long epoch1970ms = epoch1970.getTime().getTime();



    long differenceInMS = epoch1970ms - epoch1900ms;

    long differenceBetweenEpochs = differenceInMS/1000;

    */



    InputStream raw = null;

    try {

      Socket theSocket = new Socket(hostname, port);

      raw = theSocket.getInputStream();



      long secondsSince1900 = 0;

      for (int i = 0; i < 4; i++) {

        secondsSince1900 = (secondsSince1900 << 8) | raw.read();

      }



      long secondsSince1970

       = secondsSince1900 - differenceBetweenEpochs;

      long msSince1970 = secondsSince1970 * 1000;

      Date time = new Date(msSince1970);



      System.out.println("It is " + time + " at " + hostname);



    }  // end try

    catch (UnknownHostException e) {

      System.err.println(e);

    }

    catch (IOException e) {

      System.err.println(e);

    }

    finally {

      try {

        if (raw != null) raw.close();

      }

      catch (IOException e) {}

    }



  }  // end main



} // end TimeClient



   /**

   *   Java Network Programming, Third Edition

   *   By Elliotte Rusty Harold

   *   Third Edition October 2004

   *   ISBN: 0-596-00721-3

   */