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<?php $date = mktime(0, 0, 0, 1, 31); // midnight Jan 31st $oneMonthLater = mktime(0, 0, 0, date('n', $date) + 1, min(date('t', $date), date('j', $date)), date('Y', $date)); echo date('Y-m-d h:i:s', $oneMonthLater);

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