Feature summary (what you would like to be able to do and where):
Get the timezone for the wiki (e.g. UTC for enwiki, Europe/Berlin for dewiki, Asia/Bangkok for thwikibooks, etc) using mw.config.get('wgLocaltimezone'). The value can be found in https://noc.wikimedia.org/conf/highlight.php?file=InitialiseSettings.php.
Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
This would be beneficial to Bawl to work on wikis with various timezones. Bawl reads the comment IDs (like c-Nardog-2022-01-09T21:23:00.000Z-Alexis_Jazz-2022-01-09T15:51:00.000Z) but they are always UTC so a conversion is needed. Currently the value is hardcoded per-wiki within Bawl with a dumb fallback to just assuming UTC, which is wrong whenever a wiki has a timezone that isn't UTC.
There are likely other gadgets that could use it.
Benefits (why should this be implemented?):
Currently this requires a query like https://en.wikipedia.org/w/api.php?action=query&meta=siteinfo&siprop=general. This is more complicated, more error-prone and can result in reduced responsiveness.
If there is some concern with clutter or something, it wouldn't bother me if the value would only be exposed when it's not UTC, that's still easy enough to work with.