- var_dump: documentation ( source)
- date_default_timezone_set: documentation ( source)
<?php
date_default_timezone_set('UTC');
foreach (['CEST', 'CET', 'Europe/Amsterdam'] as $tzIdentifier)
{
$tz = new DateTimeZone($tzIdentifier);
var_dump([$tzIdentifier, $tz->getName(), $tz->getOffset(new DateTime('2014-05-19 11:30:00')), $tz->getLocation()]);
}