translators: default GMT offset or timezone string. Must be either a valid
offset (-12 to 14) or a valid timezone string (America/New_York). See
https:www.php.net/manual/en/timezones.php for all timezone strings currently
supported by PHP. Important: When a previous timezone string, like
`Europe/Kiev`, has been superseded by an updated one, like `Europe/Kyiv`, as
a rule of thumb, the **old** timezone name should be used in the
“translation” to allow for the default timezone setting to be PHP
cross-version compatible, as old timezone names will be recognized in new
PHP versions, while new timezone names cannot be recognized in old PHP
versions. To verify which timezone strings are available in the _oldest_ PHP
version supported, you can use https:3v4l.org/6YQAt#v5.6.20 and replace the
“BR” (Brazil) in the code line with the country code for which you want to
look up the supported timezone names.