Automattic/_s — pull request #170 by michiecat (2013-02-28 10:08:42+00:00)
Title: Adding an .updated class to post timestamp to comply with hAtom standards

Adding a new conditional to ```_s_posted_on()``` that determines if a post has been modified. If a post has been modified, add a new ```.updated``` class to the `````` element. This helps us comply with hAtom standards. See #131.