Alex Krivenyshev <info@worldtimezone.com> writes:

I guess that 3 Antarctica Stations: Amundsen-Scott (South Pole) (USA), McMurdo (USA) and Scott (N.Z.) will follow extended DST New Zealand rules and will start "Summer Time" 1 week earlier than usual- on September 30, 2007 and back to Standard Time on the first Sunday in April- April 6, 2008.

Thanks for catching that mistake; I'll update the tzdata accordingly in my next proposed patch.