Developer Question: What is the full list of supported dates that a zim can have?

If i run kiwix-zim-updater and look in kiwix-index for the regex /\d{4}-\d{2}(?!\.zim)/g which is essentially date codes NOT in YYYY-MM.zim format, i get 5 results.

Can I get a complete list of valid date parts? Also is this new or has it just happened to not get reported?

References:

https://github.com/jojo2357/kiwix-zim-updater/issues/59

Offending zims:

• wikipedia_nah_all_nopic_2026-07a
• scoutwiki_en_all_maxi_2026-07a
• wikivet.net_en_all_maxi_2026-07a
• wiki.leagueoflegends.com_en_all_maxi_2026-05a lmao
• wikipedia_nah_all_maxi_2026-07a