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<?php $date = new DateTime('2014-03-30'); $month = new DateInterval('P30D'); var_dump(date_sub($date, $month));
Output for 5.4.30 - 7.1.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2014-02-28 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.7 - 5.4.29
object(DateTime)#1 (3) { ["date"]=> string(19) "2014-02-28 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }