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<?php $date = new DateTime('2021-03-28 03:00:00', new DateTimeZone('Europe/Amsterdam')); $_30mbefore = (clone $date)->sub(new DateInterval('PT30M')); $_30mafter = (clone $date)->add(new DateInterval('PT30M')); var_dump($date->format(DATE_ATOM)); var_dump($_30mbefore->format(DATE_ATOM)); var_dump($_30mafter->format(DATE_ATOM));
Output for git.master, git.master_jit, rfc.property-hooks
string(25) "2021-03-28T03:00:00+02:00" string(25) "2021-03-28T01:30:00+01:00" string(25) "2021-03-28T03:30:00+02:00"

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