Bug #70126 [NEW]: Wrong calculation of the difference between two dates

From: php at tul dot io Operating system: any PHP version: 7.0.0beta2 Package: Date/time related Bug Type: Bug Bug description:Wrong calculation of the difference between two dates 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 bug report at https://bugs.php.net/bug.php?id=70126&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=70126&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=70126&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=70126&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=70126&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=70126&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=70126&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=70126&r=needscript Try newer version: https://bugs.php.net/fix.php?id=70126&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=70126&r=support Expected behavior: https://bugs.php.net/fix.php?id=70126&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=70126&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=70126&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=70126&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=70126&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=70126&r=dst IIS Stability: https://bugs.php.net/fix.php?id=70126&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=70126&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=70126&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=70126&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=70126&r=mysqlcfg