[php-src] Issue #11017: date() function is one hour off for America/Mexico_City timezone

Issue: https://github.com/php/php-src/issues/11017 Author: jjriv ### Description See below. when the timezone is set to America/Mexico_City and using the IntlDateFormatter parse() function to create a timestamp, the date() function is one hour off. The correct time should be midnight. This appears to be correct in older versions of PHP: https://3v4l.org/5ha27 The following code: ```php <?php $locale = "es_MX"; $shortDatePattern = "dd/MM/yy"; $in_date = "4/4/23"; $timezone = "America/Mexico_City"; date_default_timezone_set($timezone); $fmt = new IntlDateFormatter($locale,IntlDateFormatter::SHORT,IntlDateFormatter::NONE); $fmt->setPattern($shortDatePattern); $timestamp = $fmt->parse($in_date); echo gmdate('Y-m-d H:i:s', $timestamp) . "\n"; echo date('Y-m-d H:i:s', $timestamp) . "\n"; echo $timestamp . "\n"; echo date_default_timezone_get() . "\n"; ``` Resulted in this output: ``` 2023-04-04 05:00:00 2023-04-03 23:00:00 1680584400 America/Mexico_City ``` But I expected this output instead: ``` 2023-04-04 05:00:00 2023-04-04 00:00:00 1680584400 America/Mexico_City ``` ### PHP Version 8.1.13 ### Operating System _No response_