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run code in 150+ php & hhvm versions
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<?php $date = new DateTime('2014-04-25 14:59:59', new DateTimeZone('Europe/Rome')); echo $date->format('Y-m-d H:i:s O'), "\n"; $result = $date->modify('15 minutes ago'); echo $date->format('Y-m-d H:i:s O'), "\n"; var_dump($result);
Output for 5.4.30 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
2014-04-25 14:59:59 +0200 2014-04-25 14:44:59 +0200 object(DateTime)#1 (3) { ["date"]=> string(26) "2014-04-25 14:44:59.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(11) "Europe/Rome" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.4.29
2014-04-25 14:59:59 +0200 2014-04-25 14:44:59 +0200 object(DateTime)#1 (3) { ["date"]=> string(19) "2014-04-25 14:44:59" ["timezone_type"]=> int(3) ["timezone"]=> string(11) "Europe/Rome" }
Output for 5.2.0 - 5.2.17
2014-04-25 14:59:59 +0200 2014-04-25 14:44:59 +0200 NULL
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/v0tYt on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/v0tYt on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/v0tYt on line 3