How Can I Determine a User's Timezone Using PHP and JavaScript?

Get User Timezone: PHP and JavaScript Solutions

Determining the timezone of a web user is essential for various applications. This Q&A provides comprehensive PHP and JavaScript solutions to address this need.

PHP Solution:

To get the timezone as a PHP variable, use the following code:

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

This reads the session variable "time", which is set by a JavaScript snippet placed in the section of the PHP page.

JavaScript Solution:

The JavaScript snippet follows:

<script type="text/javascript">
    $(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();
                }
            });
        }
    });
</script>

This snippet detects the visitor's timezone and sends it to a PHP file called timezone.php.

Timezone.php:

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

This file receives the visitor's timezone and stores it in the session.

Usage:

After executing the JavaScript, the page reloads. The $timezone variable can now be used in PHP to customize time-related operations. Additionally, this solution returns the current GMT/UTC time zone offset.

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