- var_dump: documentation ( source)
- strtotime: documentation ( source)
<?php
$timestampCurrentPouch = strtotime('9999-12-31T00:00:00');
$isCurrentPouchValid = (($timestampCurrentPouch < strtotime('-5 years')) || ($timestampCurrentPouch > strtotime('+5 years')));
VAR_DUMP($isCurrentPouchValid);