there appears to be a problem with timezone offsets. My pages are hosted on an Apache set to GMT+1 (CET). The server's last-modified headers account for that and send the time as GMT. The sitemap generator, however, uses local server time for <lastmod> without adding a timezone offset.
* File modification time (server local time): Tue, 17 Nov 2009 21:12:46
* HTTP last-modified response header sent by the server: Tue, 17 Nov 2009 20:12:46 GMT
* <lastmod> time in the sitemap: <lastmod>2009-11-17T21:12:46+00:00</lastmod>
Is this a bug or a Sitemap Generator configuration issue?