3v4l.org

run code in 300+ PHP versions simultaneously
<?php $date = (new \DateTime('2018-07-03'))->modify('+21 days'); echo $date->format('d/m/Y')."\n"; $date = (new \DateTime('2018-07-03'))->add(new \DateInterval('P21D')); echo $date->format('d/m/Y')."\n";
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
24/07/2018 24/07/2018
preferences:
48.07 ms | 409 KiB | 5 Q