Why are the timestamps in Twitter RSS feeds listed in GMT?

Preface: my computer's timezone, and my Twitter account's timezone, are both set to GMT-5 (Eastern Standard Time). I just posted a tweet.

* On twitter.com, this tweet shows up with the correct timestamp - 8:59am.

* On my twitter RSS feed, however, the timestamp for this same exact tweet is 1:59pm (to be more exact, Fri, 30 Nov 2007 13:59:31 +0000).

Despite my timezone setting being correct, my Twitter RSS feed seems to have time stamps in GMT+0 -which is inconvenient, since I pull my twitter RSS feed into a blog and my tweets sit on top of all my actual posts for quite a while due to these incorrect timestamps.
 
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