Bug #61955 [Com]: Adding DateInterval to DateTime adds 1 additional hour

Edit report at https://bugs.php.net/bug.php?id=61955&edit=1 ID: 61955 Comment by: zhanglijiu at gmail dot com Reported by: php at arjanonline dot net Summary: Adding DateInterval to DateTime adds 1 additional hour Status: Open Type: Bug Package: Date/time related Operating System: Linux / Mac PHP Version: 5.3.12 Block user comment: N Private report: N New Comment: My result is object(DateTime)#2 (3) { ["date"]=> string(19) "1970-01-01 00:00:05" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" } My system is MAC 10.6.8 php 5.3.1 Previous Comments: ------------------------------------------------------------------------ [2012-05-05 20:45:27] php at arjanonline dot net Description: ------------ When I create a DateTime object from a (any) timestamp and then add a DateInterval object to the DateTime object, the time in the DateInterval object is added and one additional hour is also added. I have not noticed this behavior in versions up to and including 5.3.8, only in newer 5.3 versions. (I did not test in 5.4.) Also the behavior is related to the default time zone, even though the created DateTime object is in UTC. I have tested several timezones and it appears that all Europe/* and North American America/* timezones are affected. The Australian timezones seem to be unaffected. Information from phpinfo(): date - date/time support => enabled - "Olson" Timezone Database Version => 2012.3 - Timezone Database => internal Test script: --------------- date_default_timezone_set('Europe/Amsterdam'); $d1 = new DateTime('@0'); $d2 = clone($d1); $d2->add(new DateInterval('PT5S')); var_dump($d2); Expected result: ---------------- object(DateTime)[2] public 'date' => string '1970-01-01 00:00:05' (length=19) public 'timezone_type' => int 1 public 'timezone' => string '+00:00' (length=6) Actual result: -------------- object(DateTime)[2] public 'date' => string '1970-01-01 01:00:05' (length=19) public 'timezone_type' => int 1 public 'timezone' => string '+00:00' (length=6) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=61955&edit=1