<?php $start = new DateTime('2014-01-07', new DateTimeZone('UTC')); $end = clone $start; $start->sub(new DateInterval('P1M')); // substract one month echo $start->format('Y-m-d').' - '.$end->format('Y-m-d'); // 2013-12-07 - 2014-01-07 - seems correct, let's get number of days... print_r($end->diff($start)); // DateInterval Object ( [y] => 0 [m] => 2 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [invert] => 1 [days] => 61 )
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