- ini_set: documentation ( source)
- date: documentation ( source)
<?php
ini_set('date.timezone', 'Europe/Prague');
$dt = new DateTime('2014-03-29 12:00:00', new DateTimeZone('Europe/Prague'));
$dt_t = $dt->format('U');
echo $dt->format('c').' '.date('c', $dt_t)."\r\n";