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<?php var_dump(new \DateTimeImmutable('2017-08-14 +7 DAYS'));
based on GF7DX
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.3.0rc3
object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "2017-08-21 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for hhvm-3.15.4
object(DateTimeImmutable)#1 (1) { ["data":"DateTimeImmutable":private]=> object(DateTime)#2 (3) { ["date"]=> string(26) "2017-08-21 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } }