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<?php function datediffInWeeks($date1, $date2) { if($date1 > $date2) return datediffInWeeks($date2, $date1); $first = DateTime::createFromFormat('m/d/Y', $date1); $second = DateTime::createFromFormat('m/d/Y', $date2); return floor($first->diff($second)->days/7); } $q = new DateTime('First day of 2015'); var_dump($q);// 21
Output for git.master, git.master_jit, rfc.property-hooks
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 20:15:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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