php how do I grab the date of oldest item in rss feed

Posted by Steven on Stack Overflow See other posts from Stack Overflow or by Steven
Published on 2010-04-10T06:25:01Z Indexed on 2010/04/10 6:33 UTC
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rss

using simplexml to parse a feed, but I want to grab the date of the oldest item in the feed. Does anyone know how to do it? Thanks

$rss = simplexml_load_file("http://search.twitter.com/search.atom?lang=en&q=foobar&rpp=100&page=1");

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