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+I have a file with an mtime of 0312 BST, or 0212 GMT. If the atom/rss feed is
+generated while the system timezone is set to GMT, it's correctly shown as 0212
+GMT. If the system time is set to BST, it's incorrectly shown as having been
+created/modified at 0312 GMT.
+
+This occurs in both RSS and Atom feeds, but not in the HTML pages (which
+suggests it's not the server at fault, or IkiWiki overall, but rather
+whatever's generating the RSS and Atom is converting timezones wrongly).