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<?php function getDates(DateTime $date) { $day = $date->format('d'); if ($day == 20) { $nextMonth = clone $date; $nextMonth->modify('-1 day'); $nextMonth->modify('+1 month'); return [ 'start' => $date, 'end' => $nextMonth, ]; } else if ($day == 19) { $lastMonth = clone $date; $lastMonth->modify('+1 day'); $lastMonth->modify('-1 month'); return [ 'start' => $lastMonth, 'end' => $date, ]; } elseif ($day > 20) { $start = new DateTime($date->format('Y-m-20 H:i:s')); } else { $start = new DateTime($date->format('Y-m-20 H:i:s')); $start->modify('-1 month'); } $end = clone $start; $end->modify('+1 month'); $end->modify('-1 day'); return [ 'start' => $start, 'end' => $end, ]; } $date = new DateTime('2017-09-20'); var_dump(getDates($date)); $date = new DateTime('2017-09-19'); var_dump(getDates($date)); $date = new DateTime('2017-09-15'); var_dump(getDates($date)); $date = new DateTime('2017-08-23'); var_dump(getDates($date));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["start"]=> object(DateTime)#1 (3) { ["date"]=> string(26) "2017-09-20 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } ["end"]=> object(DateTime)#2 (3) { ["date"]=> string(26) "2017-10-19 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } } array(2) { ["start"]=> object(DateTime)#1 (3) { ["date"]=> string(26) "2017-08-20 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } ["end"]=> object(DateTime)#2 (3) { ["date"]=> string(26) "2017-09-19 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } } array(2) { ["start"]=> object(DateTime)#2 (3) { ["date"]=> string(26) "2017-08-20 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } ["end"]=> object(DateTime)#3 (3) { ["date"]=> string(26) "2017-09-19 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } } array(2) { ["start"]=> object(DateTime)#1 (3) { ["date"]=> string(26) "2017-08-20 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } ["end"]=> object(DateTime)#2 (3) { ["date"]=> string(26) "2017-09-19 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } }

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