Here's my Special:Notifications there: https://sr.wikipedia.org/wiki/%D0%9F%D0%BE%D1%81%D0%B5%D0%B1%D0%BD%D0%BE:%D0%9E%D0%B1%D0%B0%D0%B2%D0%B5%D1%88%D1%82%D0%B5%D1%9A%D0%B0
and if I add ?uselang=sv to change to Swedish, the date appears.
Issue reported at https://translatewiki.net/wiki/Thread:Support/Echo_-_missing_dates_in_Serbian