I released today an update of my addon with the version string 1.0.0 build 3. The date is correct: Feb 3, 2012 at 10:46 AM.
But, as you can see in the screenshot, the past version (build 2) show the same exactly date of the updated version.
Which was actually released at Monday at 7:08 PM.
This is a bug or something?
A link to the addon: http://xenforo.com/community/resources/thread-prefix-listing.80/
Few minutes later, I put the mouse over the date and this appears: