int port = DEFAULT_PORT;
if (args.length > 0) {
try {
port = Integer.parseInt(args[0]);
if (port < 0 || port >= 65536) {
System.out.println("Port must between 0 and 65535");
return;
}
}
catch (NumberFormatException ex) {}
}
// The time protocol sets the epoch at 1900,
// the java Date class at 1970. This number
// converts between them.
long differenceBetweenEpochs = 2208988800L;
try {
ServerSocket server = new ServerSocket(port);
while (true) {
Socket connection = null;
try {
connection = server.accept();
OutputStream out = connection.getOutputStream();
Date now = new Date();
long msSince1970 = now.getTime();
long secondsSince1970 = msSince1970/1000;
long secondsSince1900 = secondsSince1970
+ differenceBetweenEpochs;
byte[] time = new byte[4];
time[0]
= (byte) ((secondsSince1900 & 0x00000000FF000000L) >> 24);
time[1]
= (byte) ((secondsSince1900 & 0x0000000000FF0000L) >> 16);
time[2]
= (byte) ((secondsSince1900 & 0x000000000000FF00L) >> 8);
time[3] = (byte) (secondsSince1900 & 0x00000000000000FFL);
out.write(time);
out.flush();
} // end try
catch (IOException ex) {
} // end catch
finally {
if (connection != null) connection.close();
}
} // end while
} // end try
catch (IOException ex) {
System.err.println(ex);
} // end catch
