Parsing RSS 2.0 feed.
Guess what time zone is implied in the feed by seeing the TLD of the url and its <language> tag.
Parse RSS 2.0 XML and translate it into Atom.
To make the feed data valid in Atom format, id and link[rel=self] fields would become the url of the feed.
If pubDate is not present, updated field will be from the latest entry’s updated time, or the time it’s crawled instead.
a pair of (Feed, crawler hint)