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<?php $d = new DateTime('2015-09-24 00:00:00'); var_dump($d->modify('+2 week'));
based on 2HsIv
Output for 5.4.30 - 7.2.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-10-08 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.18 - 5.4.29
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-10-08 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }