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run code in 200+ php & hhvm versions
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<?php $yearMonth = '2017-06'; $firstDayOfThisMonth = new \DateTime($yearMonth . '-01'); var_dump($firstDayOfThisMonth->format('W')); $lastDayOfThisMonth = clone $firstDayOfThisMonth; $lastDayOfThisMonth = $lastDayOfThisMonth->modify('last day of this month'); var_dump($lastDayOfThisMonth->format('W')); $startDate = new \DateTime($firstDayOfThisMonth->format('Y') . 'W' . $firstDayOfThisMonth->format('W')); $endDate = new \DateTime($lastDayOfThisMonth->format('Y') . 'W' . $lastDayOfThisMonth->format('W')); $endDate->modify('+6 days'); var_dump($startDate); var_dump($endDate);
based on m5qdF
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
string(2) "22" string(2) "26" object(DateTime)#3 (3) { ["date"]=> string(26) "2017-05-29 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTime)#4 (3) { ["date"]=> string(26) "2017-07-02 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }