Online PHP editor | refs for d51B7

<?php printf("2013-10-31, -1 month: %s\n" . "2013-10-31, first day of 1 month ago: %s\n" . "2013-10-31, first day 1 month ago: %s\n" . "2013-10-31, first day -1 month: %s", date('m', strtotime('2013-10-31 -1 month')), date('m', strtotime('2013-10-31 first day of 1 month ago')), date('m', strtotime('2013-10-31 first day 1 month ago')), date('m', strtotime('2013-10-31 first day -1 month')));