Timezone data changes all the time, it's what governments do -- probably to keep the populace on their toes -- and yet we still survive. This time will be no different.
Stop the presses and inform the emergency agencies, the eastern state governments have extended daylight savings and there is nothing we or Microsoft can do about it. Duck and Cover!
Sensationalist hacks are calling this a mini-Y2K -- they are more correct than they realise.
Once again nothing will happen and life will continue, your calendaring will not implode and civilisation will continue.
What evidence do I have for my outlandish "against the grain" claims?
We did the same thing in 2006 for the Commonwealth Games and the worst thing that happened then was the Opening Ceremony. Looking even further back to the Sydney 2000 games and the early daylight saving hours couldn't stop Cathy Freeman from a gold medal.
Timezone data changes all the time, it's what governments do -- probably to keep the populace on their toes -- and yet we still survive. We knew Gloria Gaynor was right.