New ask Hacker News story: Ask HN: Why do some timestamps on HN have a full stop at the end?

Ask HN: Why do some timestamps on HN have a full stop at the end?
2 by eznzt | 0 comments on Hacker News.
I've noticed that now some timestamps have a full stop at the end. Like some of the submitted articles on the front page now say "2 hours ago.". What does that mean?