Your server’s Global time configuration cannot be changed, but you can use the PHP function date_default_timezone_set to set the timezone for your website. Here’s an example code that sets and checks the currently set timezone:

<?php

date_default_timezone_set("Asia/Bangkok");

echo date_default_timezone_get();

?>

A list of available PHP timezones can be found here: http://www.php.net/manual/en/timezones.php