Dates on [[ku:Special:Notifications]]
@User:Verdy p uselang=qqx hasn't helped me (see screenshot). I have followed all the red links on Template:Identical/January and I'm hoping this will resolve my problem. If you know any other way, please do contact me.
Did you look at Template:Doc-months (which is included in the doc page for January) and Template:Doc-weekdays (also linked from the previous template and included in doc pages for weekday messages)? All these messages are part of the "MediaWiki core" message group (containing the ~500 most used messages of MediaWiki).
Yeah, I did. Those are all translated. I found EDTF, maybe it has something to do with those?
According to your screenshot, these dates do not seem to be generated from MediaWiki messages, but from other internal libraries (part of PHP itself, or inside its own C/C++ dependencies?). If so, they are likely maintained in CLDR and imported later in those libraries, or integrated manually in those libraries. I have never seen these dates untranslated in languages I use. You may need to submit your question and screenshot in Phabricator, to know where they come, or if there's a need to modify the PHP code to support additional translations (e.g. if the PHP code just uses some PHP date formating function, such as those documented in the https://www.php.net/manual/en/datetime.formats.date.php extension or in https://www.php.net/manual/en/intldateformatter.format). I may be wrong, but EDTF was created much more recently than MediaWiki and PHP, and is unlikely to be used for those notifications and used as a dependency in MediaWiki.