- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
date_default_timezone_set('Europe/Amsterdam');
$time = strtotime('2014-10-25 10:00:00');
echo date('Y-m-d H:i:s', $time), PHP_EOL;
echo date('Y-m-d H:i:s', strtotime('+ 96 hours', $time)), PHP_EOL;