- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
<?php
$unix = 1414724400;
date_default_timezone_set('UTC');
$vIsoTime = date("Y-m-d H:i:s",$unix);
$oBaseTime = new DateTime($vIsoTime,new DateTimeZone("EST"));
$oBaseTime->setTimezone(new DateTimeZone("UTC"));
echo $oBaseTime->getTimestamp();