Umm, I've been using newsphp for a news system on my site. It had a built in RSS generator that spat out old rdf. I changed that so it would spit out RSS 2.0 I made a variable or whatever it's called in php
<pubDate>".$rsstime."</pubDate> spits out ISO date time.
Last time I asked, they weren't of any help. Now their website is down. So I am asking all of your php know-alls If you know what I could do. If you need any other information, let me know.