Last modified: 2011-04-18 17:59:52 UTC
All old revisions (other than current) display current date & time as timestamp instead of their real edit date. Example: http://kamelopedia.mormo.org/index.php?title=Megaherz&oldid=5148 That's the first revision of that page dating from 21 May 2004 ...
Confirmed on 1.18, 1.17 is unaffected.
Fixed in r86329.