I just found this answer on the "New answers to old questions" list, and looking at the comment I was shocked to see it was coming... from the past!
Is this a bug?
EDIT: Summarizing what's been discussed in the comments below, and looking at the post's revisions it seems the answer was really posted on 2013-11-15, it got the comment and also was deleted the same day.
So the bug seems to be in the answer, not in the comment. Looks like something happened to it to make it appear as if it was answered today (2013-12-13 03:01:30Z). Whatever happened did not reflect in the post revisions page.
Also, as Wooble said in his comment, the original delete votes seemed to be still active on the post.
EDIT 2: In addition to a couple more cases as Flexo♦ pointed out in his comments, there is this post, which was flagged as spam and deleted 3 hours ago (2013-12-17 13:55:59Z), and got an approved suggested edit a couple of hours later (2013-12-17 15:31:07Z). It seems this made the post ressurect.