Hi,

Some Wikimedia projects in languages of India have Indian time defined as the default time zone. Some don't. For precise info see:
http://noc.wikimedia.org/conf/highlight.php?file=InitialiseSettings.php

Search that file for wgLocaltimezone. You'll see that some projects have "Asia/Kolkata" as the timezone, for example guwiki (Gujarati Wikipedia), but some don't appear at all, which means that their default timezone is UTC. So for example if one goes to recent changes on the Assamese Wikisource, then the times will show by default in IST, but on Assamese Wikipedia it will be UTC.

I guess that at least some of the projects will want to switch to the timezone of India. It's easy to do - a line for each project needs to be added for each site, but this should come in as requests from each site's community.

If you have a few minutes, please check whether your favorite Wikimedia uses the appropriate default time zone. If it doesn't, please bring this up for community discussion, and if the community agrees, please request to change it in Bugzilla (or just submit a patch directly to Gerrit).

If you need any technical explanation (for example, if you have no idea how to work with Bugzilla and Gerrit), I am available for questions.

Thank you!