3v4l.org

run code in 300+ PHP versions simultaneously
<?php $days = 41397 - 25569; $unix = strtotime("+$days days", mktime(0, 0, 0, 1, 1, 1970)); $dt = DateTime::createFromFormat('d/m/Y', date('d/m/Y', $unix)); echo $dt->format('d/m/Y');

preferences:
38.34 ms | 402 KiB | 5 Q