From MacFixit today:
New Zealand/Mac OS X daylight saving conundrum: workaround
As noted by Apple Knowledge Base document #306486,
http://docs.info.apple.com/article.html?artnum=306486
in the second half of 2007, New Zealand will begin 27 weeks of Daylight Saving Time. "This means that clocks will be set forward to Daylight Saving time on Sunday 30-September-2007, instead of on the first Sunday in October as in previous years." This will cause Mac OS X systems in New Zealand to display the wrong time after September 30th.
Apple offers a manual workaround that must be performed after September 30th, as follows:
• From Date & Time in System Preferences, deselect "Set Date & Time automatically"
• Manually set the correct time.
• CClick Save.
• On 07-October-2007, reselect 'Set Date & Time automatically' or manually set the correct time again.
Meanwhile, a user has created a third-party software solution that updates
/usr/share/zoneinfo/Pacific/Auckland with the current rules, re-links /usr/share/zoneinfo/NZ to that, updates /usr/share/icu/icudt32b.dat, and updates /usr/share/icu/icudt32l.dat if it exists (it doesn't exist on Mac OS X Server PPC). The author writes:
"It will only update if any of the current files have a modification date older than July 18th. This update has been tested with Mac OS X 10.4.10 on PowerPC and Intel, and Mac OS X Server PowerPC. This update also works on Mac OS X 10.4.9, but if you upgrade to 10.4.10 you will need to reapply the update. I definitely don't expect it to work on 10.4.8 or earlier. This update should be obsoleted by Mac OS X 10.4.11 when it is released."
The application is available as a 33KB download.
Go here for the article and download:
http://www.macfixit.com/article.php?story=20070924114318477