Bug #67634 [Com]: getTimestamp() modify instance of DateTimeImmutable

Edit report at https://bugs.php.net/bug.php?id=67634&edit=1 ID: 67634 Comment by: sjon at hortensius dot net Reported by: mathieu at rochette dot cc Summary: getTimestamp() modify instance of DateTimeImmutable Status: Open Type: Bug Package: Date/time related Operating System: ubuntu PHP Version: 5.5.14 Block user comment: N Private report: N New Comment: This bug is present in all php-versions including php7: http://3v4l.org/M5Hcu The bug can also be simplified to http://3v4l.org/ShFpG; where it shows that the ->modify() call is irrelevant Previous Comments: ------------------------------------------------------------------------ [2014-07-16 15:28:40] mathieu at rochette dot cc Description: ------------ calling getTimestamp() on an instance of a DateTimeImmutable modify it (and return the modified date timestamp). calling format('U') does not modify the date Test script: --------------- <?php $date = new DateTimeImmutable('2014-05'); $date2 = $date->modify('first day of next month midnight - 1 second'); var_dump($date2->format('c')); var_dump($date2->format('U')); var_dump($date2->format('c')); var_dump($date2->getTimestamp()); var_dump($date2->format('U')); var_dump($date2->format('c')); Expected result: ---------------- string(25) "2014-05-31T23:59:59+00:00" string(10) "1401580799" string(25) "2014-05-31T23:59:59+00:00" int(1401580799) string(10) "1401580799" string(25) "2014-05-31T23:59:59+00:00" Actual result: -------------- string(25) "2014-05-31T23:59:59+00:00" string(10) "1401580799" string(25) "2014-05-31T23:59:59+00:00" int(1398988799) string(10) "1398988799" string(25) "2014-05-01T23:59:59+00:00" ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=67634&edit=1