note 122021 added to datetime.modify

function subMonths(\Datetime $dateTime, int $months) { if ($invert = $months < 0) { $months *= -1; } for ($i=0; $i<$months; $i++) { $daysOfMonth = cal_days_in_month(CAL_GREGORIAN, $dateTime->format('m'), $dateTime->format('Y')); $dateTime->modify(($invert ? '-' : '+') . $daysOfMonth . ' day'); } return $dateTime; } $dateTime = new \DateTime('2004-12-31'); echo $dateTime->modify('-3 month')->format('Y-m-d'); // 2004-10-01 echo subMonths($dateTime, -3)->format('Y-m-d'); // 2004-09-30 ---- Server IP: 208.43.231.9 Probable Submitter: 109.238.244.74 ---- Manual Page -- http://php.net/manual/en/datetime.modify.php Edit -- https://master.php.net/note/edit/122021 Del: integrated -- https://master.php.net/note/delete/122021/integrated Del: useless -- https://master.php.net/note/delete/122021/useless Del: bad code -- https://master.php.net/note/delete/122021/bad+code Del: spam -- https://master.php.net/note/delete/122021/spam Del: non-english -- https://master.php.net/note/delete/122021/non-english Del: in docs -- https://master.php.net/note/delete/122021/in+docs Del: other reasons-- https://master.php.net/note/delete/122021 Reject -- https://master.php.net/note/reject/122021 Search -- https://master.php.net/manage/user-notes.php