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<?php $creationTime = \DateTimeImmutable::createFromFormat('Y-m-d H:i:s', '2017-07-10 10:00:00'); $expirationTime = \DateTimeImmutable::createFromFormat('Y-m-d H:i:s', '2017-07-10 11:00:00'); $time = $creationTime->diff($expirationTime); var_dump($time->format('s'));

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