Online PHP editor | refs for BCerQ

<?php $date = new DateTime('2017-06-28'); var_dump($date->format('Y-m-d')); $test = floor(1 / 3); var_dump($test); $date->setDate($date->format('Y'), floor(($date->format('m')-1) / 3) * 3 + 1, 1); var_dump($date->format('Y-m-d')); $date = clone($date); $date->modify('+3 month -1 day'); var_dump($date->format('Y-m-d')); $date->setDate($date->format('Y'), 1, 1); var_dump($date->format('Y-m-d')); $date->setDate($date->format('Y'), 12, 31); var_dump($date->format('Y-m-d'));