The Rss201rev2Feed class is accessible via the webhelpers.feedgenerator module.
Adds an item to the feed.
All args are expected to be Python Unicode objects except pubdate, which is a datetime.datetime object, and enclosure, which is an instance of the Enclosure class.
Returns the latest item's pubdate.
If none of them have a pubdate, this returns the current date/time.
See the source for more information.