The labeling on the right is confusing, and in my humble opinion should rather report "edited jan 01 at 00:00 [...]", since the date / time reported is the date / time of the last edit.
As it currently stands, it looks like those on the right are the questions' creation dates, since the questions are being sorted by newest; personally I wouldn't expect to read the date / time of the last edit.
"edited jan 01 at 00:00 [...]would be viable. The date is for the last activity, not just the last edit. The activity can be anything, like answering the question, editing an answer, adding a bounty, etc. You can view the question tab in my profile as they have a bit more activity: askubuntu.com/users/8698/dan?tab=questions&sort=newest