Bug #81458 [Com]: Regression in PHP 8.1: Incorrect difference after timezone change

Edit report at https://bugs.php.net/bug.php?id=81458&edit=1 ID: 81458 Comment by: antonino dot spampinato86 at gmail dot com Reported by: kylekatarnls at gmail dot com Summary: Regression in PHP 8.1: Incorrect difference after timezone change Status: Open Type: Bug Package: Date/time related PHP Version: 8.1Git-2021-09-18 (Git) Block user comment: N Private report: N New Comment: Sorry correct: days If the DateInterval object was created by DateTime::diff(), then this is the total number of days between the start and end dates. Otherwise, days will be false. d Number of days. Previous Comments: ------------------------------------------------------------------------ [2021-09-19 14:39:54] antonino dot spampinato86 at gmail dot com Since php 8.1 diff uses the moment instead of the timestamp, D indicates the days not covered by the month while days the days. then day one with zero time and with positive offset in timestamp (UTC) becomes the last of the previous month. For maximum compatibility check between dates that have the same timezone otherwise apply your diff method. Related bug #52480 ------------------------------------------------------------------------ [2021-09-18 19:56:21] kylekatarnls at gmail dot com Description: ------------ In PHP 8.0 diff()->days returned the total number of days between dates even if one of them were in UTC and not the other In PHP 8.1 (since beta3 I think) ->d is still OK but ->days is now 0 Test script: --------------- <?php $first = (new DateTime('2018-07-01 00:00:00.000000 America/Toronto')) ->setTimezone(new DateTimeZone('UTC')); $second = new DateTime('2018-07-02 00:00:00.000000 America/Toronto'); var_dump($first->diff($second)->days); var_dump($first->diff($second)->d); Expected result: ---------------- int(1) int(1) Actual result: -------------- int(0) int(1) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81458&edit=1