Standard date format in MediaWiki
Fragment of a discussion from Support/LiquidThreads
Hi Dipsacus fullonum, the standard for Danish is defined in https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/refs/heads/master/languages/messages/MessagesDa.php#126
That means for any change a patch is needed. There are no translatable strings available.