- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
- gmdate: documentation ( source)
<?php
$online = '22.01.2014 04:40 +04';
$online = strtotime($online);
echo gmdate(DATE_RFC822, $online).PHP_EOL;
date_default_timezone_set('Europe/Moscow');
echo date("H:i d.m.Y", $online).PHP_EOL;