If I've sleuthed correctly in a non-English language, this template does not output a localized time because you did not ask for one in the parser function (see documentation). I can't say why it worked before, or if the parser function *should* be outputting 'native' time on a specific wiki, but that's probably one way to fix it now.

@Izno, The time parser always gives localized output, even on non-Bengali wikis. For example, see this page —since the content language of the page is Bengali, the output is shown in Bengali.

Anyway, that’s not the issue. The time parser and other parsers are working correctly on bnwiki and producing properly localized results, including this template.

The actual problem is that, since yesterday, on this specific Special:RecentChanges page, it is displaying English digits instead of Bengali digits. If you use the same template on any other page, it correctly gives the result in Bengali digits.

There must have been a recent change on Mediawiki that's assuming the content language of this special page is in English, and that's why it's showing English digits instead of Bengali (just my guess).

I note that this same phenomenon is occurring on the Bengali Wiktionary and the Bengali Wikibooks, but not on the Bengali Wikisource.

Change #1152331 had a related patch set uploaded (by Jon Harald Søby; author: C. Scott Ananian):

[mediawiki/core@master] Ensure MessageParser uses the correct isInterface and language

https://gerrit.wikimedia.org/r/1152331

Change #1152331 merged by jenkins-bot:

[mediawiki/core@master] Ensure MessageParser uses the correct isInterface and language

https://gerrit.wikimedia.org/r/1152331

The patch is now live, and I can't reproduce this bug any more - @Aftabuzzaman @Aram please could you confirm if this issue still exists for you?

Yes, the bug is fixed. Everything is back to how it was.