- var_dump: documentation ( source)
<?php
$date = new \DateTime('2018-10-31');
$date->modify('+62 days');
var_dump($date->format('Y-m-d'));
$date2 = new \DateTime('2018-10-31');
$date2->modify('+1 month');
var_dump($date2->format('Y-m-d'));
$date2->modify('+1 month');
var_dump($date2->format('Y-m-d'));