More analysis can be found here : https://bugs.launchpad.net/bugs/1734967
## REPRODUCER ## # sudo ln -sf /usr/share/zoneinfo/America/Godthab /etc/localtime # reboot # ls -altr /etc/localtime lrwxrwxrwx 1 root root 35 Nov 29 10:34 /etc/localtime -> /usr/share/zoneinfo/America/Godthab # date Wed Nov 29 11:01:30 -03 2017 # php tz.php America/Sao_Paulo # tz.php : <?php $script_tz = date_default_timezone_get(); echo $script_tz; ?> -- I have compile the php upstream source code from :https://github.com/php/php-src <https://github.com/php/php-src> # php --version PHP 7.3.0-dev (cli) (built: Nov 30 2017 14:52:31) ( NTS ) Copyright (c) 1997-2017 The PHP Group Zend Engine v3.3.0-dev, Copyright (c) 1998-2017 Zend Technologies # date Thu Nov 30 12:23:30 -03 2017 #php php_tz.php UTC -- At code inspection I have strong believe this commit is the one changing the behaviour between comment #2 (America/Sao_Paulo) and comment#6 (UTC) * 8e3260376c Update timezonemap.h, which needs to match commit 8e3260376c65b762a51eee7c30ab560dadefa1f6 Author: Derick Rethans <git...@derickrethans.nl> Date: Tue Oct 24 14:55:13 2017 +0100 Update timezonemap.h, which needs to match the bundled TZ db ... - { "wgst", 1, -7200, "America/Godthab" }, - { "wgt", 0, -10800, "America/Godthab" }, ... $ git tag --contains 8e3260376c php-7.0.26 php-7.0.26RC1 php-7.1.12 php-7.1.12RC1 php-7.2.0 php-7.2.0RC5 php-7.2.0RC6 It seems like this update has been backported in upstream 7.0, 7.1, ... ~1month ago. This would possibly need backported to adapt PHP package version where it applies to stay align with new tzdata package. - Eric
