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<?php $date = new DateTime('2011-03-01'); var_dump($date->format('Y-m-d')); $date->add(new DateInterval('P1Y')); var_dump($date->format('Y-m-d')); $date2 = new DateTime('2012-2-29'); var_dump($date2->format('Y-m-d')); $date2->add(new DateInterval('P1Y')); var_dump($date2->format('Y-m-d')); $date3 = new DateTime('2013-03-01'); var_dump($date3->format('Y-m-d')); $date3->add(new DateInterval('P1Y')); var_dump($date3->format('Y-m-d')); $date2 = new DateTime('2012-2-29'); var_dump($date2->format('Y-m-d')); $date2->add(new DateInterval('P4Y')); var_dump($date2->format('Y-m-d'));
Output for git.master, git.master_jit, rfc.property-hooks
string(10) "2011-03-01" string(10) "2012-03-01" string(10) "2012-02-29" string(10) "2013-03-01" string(10) "2013-03-01" string(10) "2014-03-01" string(10) "2012-02-29" string(10) "2016-02-29"

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