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<?php $tz = new DateTimeZone('Europe/Prague'); $dt = new DateTimeImmutable('2014-10-26 01:00:00', $tz); var_dump($dt); var_dump($dt->modify('+1 hour'));
Output for 5.5.24 - 5.6.28, 7.0.0 - 7.1.0
object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2014-10-26 01:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(13) "Europe/Prague" } object(DateTimeImmutable)#3 (3) { ["date"]=> string(26) "2014-10-26 02:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(13) "Europe/Prague" }
Output for hhvm-3.12.0
object(DateTimeImmutable)#2 (1) { ["data":"DateTimeImmutable":private]=> object(DateTime)#3 (3) { ["date"]=> string(26) "2014-10-26 01:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(13) "Europe/Prague" } } object(DateTimeImmutable)#4 (1) { ["data":"DateTimeImmutable":private]=> object(DateTime)#5 (3) { ["date"]=> string(26) "2014-10-26 02:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(13) "Europe/Prague" } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.4.45
Fatal error: Class 'DateTimeImmutable' not found in /in/fmMad on line 4
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTimeZone' not found in /in/fmMad on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetimezone in /in/fmMad on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetimezone in /in/fmMad on line 3