3v4l.org

run code in 300+ PHP versions simultaneously
<?php $time_zones = array( 'America/Chicago', 'GMT', 'Europe/Berlin', ); foreach($time_zones as $time_zone){ date_default_timezone_set($time_zone); $t1 = mktime(23, 0, 0); $t2 = strtotime('today 23:00:00'); $t3 = strtotime('23:00:00'); echo date('r', $t1) . ' / ' . date('r', $t2) . ' / ' . date('r', $t3) . PHP_EOL; }
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Fri, 02 Dec 2016 23:00:00 -0600 / Fri, 02 Dec 2016 23:00:00 -0600 / Fri, 02 Dec 2016 23:00:00 -0600 Fri, 02 Dec 2016 23:00:00 +0000 / Fri, 02 Dec 2016 23:00:00 +0000 / Fri, 02 Dec 2016 23:00:00 +0000 Fri, 02 Dec 2016 23:00:00 +0100 / Fri, 02 Dec 2016 23:00:00 +0100 / Fri, 02 Dec 2016 23:00:00 +0100
preferences:
270.74 ms | 404 KiB | 293 Q