How to update your Mac for the change in Daylight Savings Time
As you may already know, beginning in 2007 daylight savings time (DST) will be extended in the United States and Canada. DST will start on March 11, 2007, which is three weeks earlier than usual, and it will end on November 4, 2007, which is one week later than usual.
Mac users who have Software Update set to automatically check for updates on a regular basis should have already been prompted to download and install new software. If you haven't, or you want to double-check, here are the steps.
For you PC users, read this.
How to update your Mac...
Apple menu > About this Mac > check your version of Mac OS X
if 10.4.6 or above:
Save all open documents and quit all apps >
Apple menu > Software Update... > run all appropriate updates > restart computer
if 10.3.x or below:
Update your OS X installation to 10.4.6. You'll probably have to purchase it.