3v4l.org

run code in 500+ PHP versions simultaneously
<?php date_default_timezone_set('America/Lower_Princes'); echo strtotime("2018-10-28 01:00:00 Europe/London") . PHP_EOL; date_default_timezone_set('Europe/London'); echo strtotime("2018-10-28 01:00:00 Europe/London"). PHP_EOL;
Output for 8.1.7 - 8.1.11
1540688400 1540684800
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.6
1540688400 1540688400
Output for 8.1.12 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
1540684800 1540684800
preferences:
33.82 ms | 1143 KiB | 11 Q