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<?php var_dump(new \DateTime(), new \DateTime('+1 month'));
Output for 7.3.0rc3
object(DateTime)#1 (3) { ["date"]=> string(26) "2018-10-30 12:38:14.016386" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTime)#2 (3) { ["date"]=> string(26) "2018-11-30 12:38:14.016437" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }