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<?php date_default_timezone_set('Europe/Amsterdam'); $d1 = new DateTime('@0'); $d2 = clone $d1; $d2->add(new DateInterval('PT5S')); var_dump($d2);
Output for 5.4.30 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(DateTime)#2 (3) { ["date"]=> string(26) "1970-01-01 00:00:05.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.4.29
object(DateTime)#2 (3) { ["date"]=> string(19) "1970-01-01 00:00:05" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" }
Output for 5.2.0 - 5.2.17
Fatal error: Call to undefined method DateTime::add() in /in/EUGNd on line 5
Process exited with code 255.
Output for 5.1.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/EUGNd on line 3
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function date_default_timezone_set() in /in/EUGNd on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_VARIABLE in /in/EUGNd on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_VARIABLE in /in/EUGNd on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/EUGNd on line 4
Process exited with code 255.