Edit report at https://bugs.php.net/bug.php?id=77571&edit=1
ID: 77571
User updated by: techouse at gmail dot com
Reported by: techouse at gmail dot com
Summary: DateInterval has incorrect interval using timezones
from UTC+01:00 to UTC+12:00
Status: Open
Type: Bug
Package: Date/time related
Operating System: macOS 10.14.3, Ubuntu 18.04
PHP Version: 7.3.1, 7.2.10
Block user comment: N
Private report: N
New Comment:
Might be related to https://bugs.php.net/bug.php?id=52480
Previous Comments:
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[2019-02-06 08:22:05] techouse at gmail dot com
Better summary
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[2019-02-06 08:20:45] techouse at gmail dot com
Updated the summary to be more descriptive and added another tested PHP version.
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[2019-02-05 15:26:37] techouse at gmail dot com
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.
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Edit this bug report at https://bugs.php.net/bug.php?id=77571&edit=1