PHP or JavaScript: Which is Better for Determining a User's Time Zone?

Determining a User's Time Zone: PHP or JavaScript?

When determining a web user's time zone, both PHP and JavaScript have their advantages.

PHP

PHP's ability to store the time zone in a session variable ($_SESSION['time']) makes it convenient for subsequent access. The following code snippet illustrates this approach:

<?php session_start();
    $timezone = $_SESSION['time'];
?>

JavaScript

JavaScript, on the other hand, requires an asynchronous request to determine the user's time zone. This approach involves sending the visitor's time zone (visitortimezone) to a server-side script (timezone.php) using jQuery's AJAX functionality:

$(document).ready(function() {
    if("<?php echo $timezone; ?>".length==0){
        var visitortime = new Date();
        var visitortimezone = "GMT " + -visitortime.getTimezoneOffset()/60;
        $.ajax({
            type: "GET",
            url: "http://example.com/timezone.php",
            data: 'time='+ visitortimezone,
            success: function(){
                location.reload();
            }
        });
    }
});

Server-Side Script (timezone.php)

The following PHP script is placed on the server and receives the time zone information from the AJAX request:

<?php session_start();
    $_SESSION['time'] = $_GET['time'];
?>

Usage

Once the time zone has been determined (either via PHP or JavaScript), it can be used for various purposes, such as adjusting time values or displaying localized time information.

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