Bug #67269 [Com]: Adding DateInterval to a DateTime object does not add the correct amount

Edit report at https://bugs.php.net/bug.php?id=67269&edit=1 ID: 67269 Comment by: sea128 at post dot cz Reported by: kai dot xu at achievers dot com Summary: Adding DateInterval to a DateTime object does not add the correct amount Status: Open Type: Bug Package: Date/time related Operating System: Linux PHP Version: 5.4.27 Block user comment: N Private report: N New Comment: Caused by daylight saving. Similar to https://bugs.php.net/bug.php?id=63442 Previous Comments: ------------------------------------------------------------------------ [2014-05-20 18:36:41] kai dot xu at achievers dot com The timezone setting is America/New_York ------------------------------------------------------------------------ [2014-05-13 17:38:05] kai dot xu at achievers dot com Description: ------------ When adding a DateInterval to a DateTime object, it adds unexpected amounts of seconds. For the following time frames, adding DateInterval doesn't work correctly (my PHP version 5.4.27) // PT1M – adding 1 minute. Expected timestamp differential : 60 seconds 1414907940 - 1414911539 ( 2014-11-02 05:59:00 - 2014-11-02 06:58:59 ) test script result: -3540 1414911540 - 1414911599 ( 2014-11-02 06:59:00 - 2014-11-02 06:59:59 ) test script result: -7140 1446357540 - 1446361139 ( 2015-11-01 05:59:00 - 2015-11-01 06:58:59 ) test script result: -3540 1446361140 - 1446361199 ( 2015-11-01 06:59:00 - 2015-11-01 06:59:59 ) test script result: -7140 ------------------------------------------------------------------------------- // PT1H - adding 1 hour. Expected timestamp differential : 3600 seconds 1414904400 - 1414907999 ( 2014-11-02 05:00:00 - 2014-11-02 05:59:59 ) test script result: 0 1414908000 - 1414911599 ( 2014-11-02 06:00:00 - 2014-11-02 06:59:59 ) test script result: -3600 1446354000 - 1446357599 ( 2015-11-01 05:00:00 - 2015-11-01 05:59:59 ) test script result: 0 1446357600 - 1446361199 ( 2015-11-01 06:00:00 - 2015-11-01 06:59:59 ) test script result: -3600 ------------------------------------------------------------------------------- // P1D - adding 1 day. Expected timestamp differential : 86400 seconds 1394265600 - 1394348399 ( 2014-03-08 08:00:00 - 2014-03-09 06:59:59 ) test script result: 82800 1414821600 - 1414907999 ( 2014-11-01 06:00:00 - 2014-11-02 05:59:59 ) test script result: 90000 1425715200 - 1425797999 ( 2015-03-07 08:00:00 - 2015-03-08 06:59:59 ) test script result: 82800 1446271200 - 1446357599 ( 2015-10-31 06:00:00 - 2015-11-01 05:59:59 ) test script result: 90000 ------------------------------------------------------------------------------- Test script: --------------- // e.g. adding 1 minute to a DateTime object. The difference should be 60 but it returns -3560. $ts = 1414907940; $d = date('Y-m-d H:i:s', $ts); $dt = new DateTime($d); $di = new DateInterval('PT1M'); $dt->add($di); echo ($dt->getTimestamp() - $ts); // expecting 60 Expected result: ---------------- add the correct minute/hour/day to a DateTime object for any DateTime object Actual result: -------------- For some time frames, it sometimes adds more, sometimes adds less number of seconds to a Datetime object. (see description) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=67269&edit=1