- var_dump: documentation ( source)
<?php
$dataTimeZone = new DateTimeZone("Asia/Novosibirsk");
$datetime = new DateTime('02.06.2015',$dataTimeZone);
$now = new DateTime('02.06.2017',$dataTimeZone);
$interval = $datetime->diff($now);
$fullYear = (int)$interval->format("%Y");
var_Dump($interval, $fullYear);