Bug #70126 [Opn->Sus]: Wrong calculation of the difference between two dates

Edit report at https://bugs.php.net/bug.php?id=70126&edit=1 ID: 70126 Updated by: derick@php.net Reported by: php at tul dot io Summary: Wrong calculation of the difference between two dates -Status: Open +Status: Suspended Type: Bug Package: Date/time related Operating System: any PHP Version: 7.0.0beta2 -Assigned To: +Assigned To: derick Block user comment: N Private report: N New Comment: timelib development lives at http://github.com/derickr/timelib - the one in PHP is a bundled version. Timelib does right now not have a test harnass for diffs, although there is a tester for it: https://github.com/derickr/timelib/blob/master/tests/tester-diff.c Once it's fixed (and tested) in timelib, I'm happy to resync it back to PHP. Previous Comments: ------------------------------------------------------------------------ [2015-07-24 09:50:38] php at tul dot io Description: ------------ DateTime::diff() reports the wrong number of days and months when not in an inverted order (start date < end date). To reproduce, the two dates used as input have to be even number of months apart and the day of the start date has to be greater than the day of the end date (e.g. 2015-01-31 to 2015-03-01). Test script: --------------- <?php $date1 = new DateTime('2015/01/31'); $date2 = new DateTime('2015/03/01'); print_r($date1->diff($date2)); print_r($date2->diff($date1)); Expected result: ---------------- DateInterval Object ( [y] => 0 [m] => 1 [d] => 1 [h] => 0 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 0 [days] => 29 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 ) DateInterval Object ( [y] => 0 [m] => 1 [d] => 1 [h] => 0 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 1 [days] => 29 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 ) Actual result: -------------- DateInterval Object ( [y] => 0 [m] => 0 [d] => 29 [h] => 0 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 0 [days] => 29 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 ) DateInterval Object ( [y] => 0 [m] => 1 [d] => 1 [h] => 0 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 1 [days] => 29 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 ) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=70126&edit=1