- var_dump: documentation ( source)
- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
<?php
date_default_timezone_set("Europe/Berlin");
$tz = new \DateTimeZone("Europe/Berlin");
$ts = 1490281920;
$obj1 = new DateTime("@$ts", $tz);
var_dump($obj1->format('c'));
$obj = new DateTime("@$ts");
$obj->setTimezone($tz);
var_dump($obj->format('c'));
$date = date("c", $ts);
var_dump($date);