1--TEST-- 2Bug #54340 (DateTime::add() method bug) 3--INI-- 4date.timezone=UTC 5--FILE-- 6<?php 7$interval = new DateInterval('P1D'); 8 9$dt = new DateTime('first day of January 2011'); 10var_dump($dt); 11 12$dt->add($interval); 13var_dump($dt); 14 15$dt = new DateTime('first day of January 2011'); 16 17$dt->sub($interval); 18var_dump($dt); 19--EXPECT-- 20object(DateTime)#2 (3) { 21 ["date"]=> 22 string(19) "2011-01-01 00:00:00" 23 ["timezone_type"]=> 24 int(3) 25 ["timezone"]=> 26 string(3) "UTC" 27} 28object(DateTime)#2 (3) { 29 ["date"]=> 30 string(19) "2011-01-02 00:00:00" 31 ["timezone_type"]=> 32 int(3) 33 ["timezone"]=> 34 string(3) "UTC" 35} 36object(DateTime)#3 (3) { 37 ["date"]=> 38 string(19) "2010-12-31 00:00:00" 39 ["timezone_type"]=> 40 int(3) 41 ["timezone"]=> 42 string(3) "UTC" 43} 44