Looking at this thread, it was originally posted at Aug 9th 2008 12:43am according to the top menu bar. It was then edited at Today 1:13am, also according to the top menu bar.
At the bottom of the post, the line that gets autoinserted whenever you edit a post says it was edited at Aug 8th 2008 10:10pm. Looks like the edit bar uses whatever you've set as your local time, perhaps, whereas the line in the post is based on the poster's local time? The three hours would be accounted for different time zone settings, but the three minute difference between the two is just bizarre.