Bug #79863 [Com]: Timezone conversion result depends on environment

Edit report at https://bugs.php.net/bug.php?id=79863&edit=1 ID: 79863 Comment by: antonino dot spampinato86 at gmail dot com Reported by: bassjoe at web dot de Summary: Timezone conversion result depends on environment Status: Open Type: Bug Package: Date/time related Operating System: CentOS Linux 7 PHP Version: 7.4.8 Block user comment: N Private report: N New Comment: From php 5.4+ it retrieves the time zone if set via date_default_timezone_get or from the php.ini date.timezone setting or set to UTC if absent date.timezone and date_default_timezone_get. From php 7 if date.timezone is not set it does not show warning. for more information read here https://www.php.net/manual/en/datetime.configuration.php#ini.date.timezone https://3v4l.org/0enPY I don't think it's a php bug but maybe it doesn't do that php expects and therefore it's an error even with date_default_timezone_get https://www.php.net/manual/en/function.date-default-timezone-get.php#113202 Note* WordPress set date_default_timezone_set("UTC"); https://github.com/WordPress/WordPress/blob/5.6-branch/wp-settings.php#L68 Previous Comments: ------------------------------------------------------------------------ [2020-12-04 13:46:17] smeyer dot ilias at gmx dot de I observed a similar issue with PHP 7.2.5 on SLES 12 SP 5: <?php date_default_timezone_set('UTC'); echo date('Y-m-d: H:i:s e'); date_default_timezone_set('Europe/Berlin'); echo date('Y-m-d: H:i:s e'); date_default_timezone_set('Asia/Irkutsk'); echo date('Y-m-d: H:i:s e'); Returns: 2020-12-04: 12:43:34 UTC 2020-12-04: 12:43:34 Europe/Berlin 2020-12-04: 12:43:34 Asia/Irkutsk Changes in /etc/php/cli/php.ini date.timezone did not make difference. I have no direct access to the server, but could provide more information regarding the server environment. ------------------------------------------------------------------------ [2020-07-25 20:31:17] bassjoe at web dot de Now this is very strange. I get the correct result if I check out PHP 7.4.8 (same version as the REMI packages) from Git, compile it on CentOS 7, and run this php executable on the server. So in the same environment and while ignoring php.ini (with -n) I get different results for the same version. # installed from remi repo: # php-cli-7.4.8-2.el7.remi.x86_64 # php-7.4.8-2.el7.remi.x86_64 $ php --version PHP 7.4.8 (cli) (built: Jul 9 2020 08:57:23) ( NTS ) Copyright (c) The PHP Group Zend Engine v3.4.0, Copyright (c) Zend Technologies $ php -n -r '$datetime = date_create("2020-07-13 10:38:15", new DateTimeZone("Europe/Berlin")); var_dump($datetime); $datetime->setTimezone( new DateTimeZone( "UTC" ) ); var_dump($datetime);' object(DateTime)#2 (3) { ["date"]=> string(26) "2020-07-13 10:38:15.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(13) "Europe/Berlin" } object(DateTime)#2 (3) { ["date"]=> string(26) "2020-07-13 10:38:15.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } # self-compiled on centos 7 => correct result $ sapi/cli/php --version PHP 7.4.8 (cli) (built: Jul 25 2020 22:12:24) ( NTS ) Copyright (c) The PHP Group Zend Engine v3.4.0, Copyright (c) Zend Technologies $ sapi/cli/php -n -r '$datetime = date_create("2020-07-13 10:38:15", new DateTimeZone("Europe/Berlin")); var_dump($datetime); $datetime->setTimezone( new DateTimeZone( "UTC" ) ); var_dump($datetime);' object(DateTime)#2 (3) { ["date"]=> string(26) "2020-07-13 10:38:15.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(13) "Europe/Berlin" } object(DateTime)#2 (3) { ["date"]=> string(26) "2020-07-13 08:38:15.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } ------------------------------------------------------------------------ [2020-07-17 19:21:22] bassjoe at web dot de The result is the same with this command sequence. Workstation (correct): $ php -r '$datetime = date_create("2020-07-13 10:38:15", timezone_open("Europe/Berlin")); date_timezone_set( $datetime, timezone_open( "UTC" ) ); date_format( $datetime, "Y-m-d H:i:s" ); var_dump($datetime);' Command line code:1: class DateTime#2 (3) { public $date => string(26) "2020-07-13 08:38:15.000000" public $timezone_type => int(3) public $timezone => string(3) "UTC" } Server (wrong): $ php -r '$datetime = date_create("2020-07-13 10:38:15", timezone_open("Europe/Berlin")); date_timezone_set( $datetime, timezone_open( "UTC" ) ); date_format( $datetime, "Y-m-d H:i:s" ); var_dump($datetime);' object(DateTime)#2 (3) { ["date"]=> string(26) "2020-07-13 10:38:15.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } ------------------------------------------------------------------------ [2020-07-17 13:37:58] antonino dot spampinato86 at gmail dot com <?php $datetime = date_create("2020-07-13 10:38:15", timezone_open("Europe/Berlin")); date_timezone_set( $datetime, timezone_open( "UTC" ) ); date_format( $datetime, "Y-m-d H:i:s" ); var_dump($datetime); Expected result: ---------------- object(DateTime)#5 (3) { ["date"]=> string(26) "2020-07-13 08:38:15.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } timezone now is UTC? ------------------------------------------------------------------------ [2020-07-15 09:22:20] bassjoe at web dot de wp_timezone()->getName() is what I logged and it was "Europe/Berlin" ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=79863 -- Edit this bug report at https://bugs.php.net/bug.php?id=79863&edit=1