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<?php var_dump( new \DateTimeImmutable('2017-04-14 10:00:00') );
Output for 5.6.0 - 5.6.30, 7.1.0 - 7.3.0alpha1
object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "2017-04-14 10:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for hhvm-3.18.5 - 3.22.0
object(DateTimeImmutable)#1 (1) { ["data":"DateTimeImmutable":private]=> object(DateTime)#2 (3) { ["date"]=> string(26) "2017-04-14 10:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } }