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<?php date_default_timezone_set('UTC'); $datetime1 = new \DateTime('01.03.2018'); $datetime2 = new \DateTime('31.03.2018'); $interval = $datetime1->diff($datetime2); var_dump($interval->format('%m')); //string(1) "1" $datetime1 = new \DateTime('01.01.2018'); $datetime2 = new \DateTime('31.01.2018'); $interval = $datetime1->diff($datetime2); var_dump($interval->format('%m')); //string(1) "0" $datetime1 = new \DateTime('01.02.2018'); $datetime2 = new \DateTime('1.03.2018'); $interval = $datetime1->diff($datetime2); var_dump($interval->format('%m')); //string(1) "0"

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