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<?php $dateTime = new DateTime('2016-10-29 10:00:00'); $dateTime->add(new DateInterval('P1D')); var_dump($dateTime); // 2016-10-30 10:00 $dateTime = new DateTime('2016-10-29 10:00:00'); $dateTime->add(new DateInterval('PT24H')); var_dump($dateTime); // 2016-10-30 09:00

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