At the bottom of every page, when you say e.g., "this page was last
modified 12:15, 11 January 2007." Who will know what that means
without a timezone indicator, (preferably e.g., +0800 (and not e.g.,
CST which means China Standard Time here and not what you were
thinking.))

Wait, on Recentchanges one couldn't say that 1000 times, no room.
So to be consistent, you say it nowhere. OK, never mind.

But wait, on an average page there is room to add the timezone.

And maybe on Recentchanges you could say it just once, at the end of
"Show new changes starting from 10:08, 28 January 2007".

No, that the user can set something in Preferences is no excuse.

Version: 1.9.x
Severity: minor
OS: Linux
Platform: PC