Bug #77571 [NEW]: DateInterval timezone bug

From: Date: Tue, 05 Feb 2019 15:26:37 +0000
Subject: Bug #77571 [NEW]: DateInterval timezone bug
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-219370@lists.php.net to get a copy of this message 
From:             techouse at gmail dot com
Operating system: macOS 10.14.3, Ubuntu 18.04
PHP version:      7.3.1
Package:          Date/time related
Bug Type:         Bug
Bug description:DateInterval timezone bug

Description:
------------
Yesterday I observed a weird DateInterval bug where adding 5 weeks would
always equal 35 days but the difference in months and days would not be
correct.

After some digging I figured out it was related to timezones and only
affected timezones ranging from Europe/London eastward all the way to
Pacific/Auckland, however as soon as I used Pacific/Honolulu the issue
was gone.

Test findings

All the tests in tests/Timezones/America and tests/Timezones/Atlantic
pass. Another weird thing is that Europe/London passes all tests where
it does not adhere to daylight savings time (UTC+01:00).

From this I draw a conclusion that all timezones that are greater than
UTC+00:00 fail because of this additional time.

All the tests and findings can be found in my GitHub repo
https://github.com/techouse/php-date-interval-timezone-bug

Test script:
---------------
https://github.com/techouse/php-date-interval-timezone-bug

Expected result:
----------------
A correct DateInterval.


-- 
Edit bug report at https://bugs.php.net/bug.php?id=77571&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=77571&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=77571&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=77571&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=77571&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=77571&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=77571&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=77571&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=77571&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=77571&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=77571&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=77571&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=77571&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=77571&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77571&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=77571&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=77571&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=77571&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=77571&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=77571&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=77571&r=mysqlcfg

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