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<?php $d = new DateTime('2018-05-10 15:59:00 Z'); $d->modify(sprintf('+%d min', 60 - $d->format('i'))); var_dump($d->format('Y-m-d H:i:s')); $d = new DateTime('2018-05-10 16:00:00 Z'); $d->modify(sprintf('+%d min', 60 - $d->format('i'))); var_dump($d->format('Y-m-d H:i:s')); $d = new DateTime('2018-05-10 15:30:00 Z'); $d->modify(sprintf('+%d min', 60 - $d->format('i'))); var_dump($d->format('Y-m-d H:i:s'));
Output for git.master, git.master_jit, rfc.property-hooks
string(19) "2018-05-10 16:00:00" string(19) "2018-05-10 17:00:00" string(19) "2018-05-10 16:00:00"

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