To adjust your operating system's time correctly...
Mac OS X 10.4
Install Mac OS X 10.4.5 Update or later. This contains updated Daylight Saving Time rules that maintain the proper time automatically.
Mac OS X 10.3.9 or earlier
You can select a different time zone, or set the time manually.
for more information, please see Mac OS X: Adjusting Date & Time for Australian Daylight Saving Time's extra week in 2006
I have no idea if Microsoft offers a similar adjustment for the extra week of daylight saving in 2006, but one Windows 2000 Pro machine adjusted to the wrong time I noticed.
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