Please set up new date format for Latvian Wikipedia in signatures, (suppose - all) system pages (like in [[https://lv.wikipedia.org/wiki/Special:RecentChanges | Recent changes page]] //3 aprīlī, 2015//). From //3 aprīlī, 2015// to //2015. gada 3. aprīlis//.
I suppose it would mean that new date format would be: Y". gada" j. F
Will update the mediawiki interface messages later, when this will be deployed. As there is at least two (which I have spotted) date+time formats, if you could give all possible variants, I could tell more precise what we need.
[[https://lv.wikipedia.org/wiki/Vikip%C4%93dija:Balso%C5%A1ana/Par_da%C5%BE%C4%81diem_labojumiem#Datums | Community consensus]] (the section "Datums").