$//$CLIENT CODE: $------------------------$

import java.io$.*$;

import java.net.$*$;

public class Client$\{$

public static void main$($String$[]$ args$)\{$

DatagramSocket clientSocket $=$ null;

try $\{$

clientSocket $=$ new DatagramSocket$()$;

InetAddress serverAddress $=$ InetAddress.getByName$("$localhost$")$;

$//$ Send request to the server with separator $"\_"$

String request $=$ "GET$\_$TIMESTAMP";

byte$[]$ sendData $=$ request.getBytes$()$;

DatagramPacket sendPacket $=$ new DatagramPacket$($sendData$,$ sendData$.$length, serverAddress, $12345)$;

clientSocket.send$($sendPacket$)$;

byte$[]$ receiveData $=$ new byte$[1024]$;

DatagramPacket receivePacket $=$ new DatagramPacket$($receiveData$,$ receiveData.length$)$;

clientSocket.receive$($receivePacket$)$;

String timestamp $=$ new String$($receivePacket$.$getData$(),0,$ receivePacket.getLength$())$;

System.out.println$("$Received timestamp from server: $"+$ timestamp$)$;

$\}$ catch $($IOException e$)\{$

e$.$printStackTrace$()$;

$\}$ finally $\{$

if $($clientSocket $!=$ null && $!$clientSocket.isClosed$())\{$

clientSocket.close$()$;

$\}$

$\}$

$\}$

$\}$

$//$SERVER CODE: $------------------------$

import java.io$.*$;

import java.net.$*$;

public class Server$\{$

public static void main$($String$[]$ args$)\{$

DatagramSocket serverSocket $=$ null;

try $\{$

serverSocket $=$ new DatagramSocket$(12345)$;

byte$[]$ receiveData $=$ new byte$[1024]$;

System.out.println$("$Server is listening on port $12345...")$;

while $($true$)\{$

DatagramPacket receivePacket $=$ new DatagramPacket$($receiveData$,$ receiveData.length$)$;

serverSocket.receive$($receivePacket$)$;

String message $=$ new String$($receivePacket$.$getData$(),0,$ receivePacket.getLength$())$;

String$[]$ parts $=$ message.split$("\_")$;

if $($parts$.$length $==2$ && parts$[0].$equals$("$GET$")$ && parts$[1].$equals$("$TIMESTAMP$"))\{$

String timestamp $=$ java.time.LocalDateTime.now$().$toString$()$;

InetAddress clientAddress $=$ receivePacket.getAddress$()$;

int clientPort $=$ receivePacket.getPort$()$;

byte$[]$ sendData $=$ timestamp.getBytes$()$;

DatagramPacket sendPacket $=$ new DatagramPacket$($sendData$,$ sendData$.$length, clientAddress, clientPort$)$;

serverSocket.send$($sendPacket$)$;

System.out.println$("$Timestamp sent to client at $"+$ clientAddress $+"$:$"+$ clientPort$)$;

$\}$ else $\{$

System.out.println$("$Invalid request from client"$)$;

$\}$

$\}$

$\}$ catch $($IOException e$)\{$

e$.$printStackTrace$()$;

$\}$ finally $\{$

if $($serverSocket $!=$ null && $!$serverSocket.isClosed$())\{$

serverSocket.close$()$;

$\}$

$\}$

$\}$

$\}$