Bug #80084 [NEW]: Incorrect UTC offset per Olson TZ Database in Asia/Almaty.

From: kevin at arcpointgroup dot com Operating system: Ubuntu 18.04.2 LTS PHP version: 7.3.22 Package: Date/time related Bug Type: Bug Bug description:Incorrect UTC offset per Olson TZ Database in Asia/Almaty. Description: ------------ Date Extension Settings (default for PHP 7.3): ``` date/time support enabled timelib version 2018.03 "Olson" Timezone Database Version 2020.1 Timezone Database internal Default timezone UTC ``` According to the Olson Timezone Database, the UTC offset value for timezone Asia/Almaty for 1986-06-01T00:00:00 should be either +5 or +6 hours. (If daylight savings time is observed, then the offset will be +6 hours.) PHP returns +7 hours. See the timezone rule for this timezone that has been in place for 5 years (prior to PHP 7.3): https://github.com/eggert/tz/blame/cb2d288ae0bb3aa5fb7cc94480ea955ff76bd183/asia#L2332 Here is an additional reference indicating the appropriate UTC offset for this timezone and aforementioned date should be +6 hours: http://en.timeofdate.com/city/Kazakhstan/Kostanay/timezone/change?start=1980 (Kostanay, Kazakhstan uses the Asia/Almaty timezone.) Test script: --------------- $dt = new DateTime('1986-06-01 00:00:00', new DateTimeZone('Asia/Almaty')); echo $dt->format('Z'); Expected result: ---------------- 21600 Actual result: -------------- 25200 -- Edit bug report at https://bugs.php.net/bug.php?id=80084&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=80084&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=80084&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=80084&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=80084&r=needscript Try newer version: https://bugs.php.net/fix.php?id=80084&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=80084&r=support Expected behavior: https://bugs.php.net/fix.php?id=80084&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=80084&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=80084&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=80084&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=80084&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=80084&r=dst IIS Stability: https://bugs.php.net/fix.php?id=80084&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=80084&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=80084&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=80084&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=80084&r=mysqlcfg