- date_diff: documentation ( source)
- date_create: documentation ( source)
- date: documentation ( source)
<?php
$diff=date_diff(date_create('1997-1-1'),date_create(date("Y-m-d")));
echo $diff->format("%R%a days");
if ($diff < new DateTime('18 years')){
echo 'Too young!';
} else {
echo 'old_enough';
}