Archived - About Daylight Saving Time changes in 2007

Summary

n 2007, several countries and regions will change the dates on which they observe Daylight Saving Time (DST). In the United States, all states except Arizona and Hawaii will begin observing Daylight Saving Time on March 11. Many provinces in Canada will also adjust their DST observance, as will some states and provinces in other countries. Daylight Saving Time observances vary between countries and regions and are subject to change by national and provincial governments. For more information about 2007 Daylight Saving Time changes in the United States, see this website.

Products Affected

Mac OS

This article has been archived and is no longer updated by Apple.

DST rule changes for the United States and most of Canada are already available in Mac OS X 10.4.5 or later

That's right, the 2007 time zone and Daylight Saving Time rule changes for the United States and most of Canada are already available in Mac OS X 10.4.5 (released February, 2006) or later. However, some additional regions that recently adopted time zone and DST changes are available in the February, 2007 Daylight Saving Time Update, detailed below.

February, 2007 Daylight Saving Time Update

Apple is providing software updates for Mac OS X 10.3, 10.4 and later based on worldwide time zone information available as of January 8, 2007. To make sure that your clock maintains the proper time, simply install the updates that are shown for your computer in Software Update. You should install these updates even if your computer is used in a time zone that is not affected. For more details about the available updates, or if you have an earlier Mac OS version, see below.

Mac OS X 10.4 and Mac OS X Server 10.4 Tiger

The 2007 time zone and Daylight Saving Time rule changes for the United States and most of Canada are already available in Mac OS X 10.4.5 or later.

Some additional regions that recently adopted time zone and DST changes are available in the February, 2007 Daylight Saving Time Update. This includes rule changes (as of January, 2007) for Australia, Brazil, the provinces of Alberta and British Columbia, Canada and several other regions. For more information about this update, see this article.

Mac OS X 10.4.9 note: Changes in the Daylight Saving Time Update for Mac OS X 10.4.8 are included in the Mac OS X 10.4.9 update. For more information about this update, see About the Mac OS X 10.4.9 Update (delta).

Mac OS X 10.3 and Mac OS X Server 10.3 Panther

All time zone and Daylight Saving Time changes described above, as of January 2007, are included in the Daylight Saving Time Update, released in February, 2007. If you've not already done so, install Mac OS X Panther 10.3.9 and the Daylight Saving Time Update. For more information about this update, see this article.

Mac OS X and Mac OS X Server versions 10.0.x through 10.2.8

If you're still using Mac OS X 10.2.8 or earlier, you can adjust your clock manually using Date & Time preferences. Deselect the option to set date and time automatically, then set the time for your local time zone as needed.

Mac OS 9.2 or earlier

Still using Mac OS 9.2? Use the Date and Time control panel to deselect the option to observe Daylight Saving Time changes automatically, then enable Daylight Saving Time manually. Applications that run in the Classic environment of Mac OS X will honor the Daylight Saving Time setting in Mac OS X.

Classic environment in Mac OS X

Applications that run in Classic will honor the Daylight Saving Time setting in Mac OS X.


Java

In addition to the Mac OS X updates listed above, the Java environment requires an additional update for compatibility with the time zone and DST changes described above.

For Mac OS X 10.4 and Mac OS X Server 10.4, install Java for Mac OS X 10.4, Release 5. For more information about this update, see this article.

For Mac OS X 10.3 and Mac OS X Server 10.3, install Java for Mac OS X 10.3, Update 5. For more information about this update, see this article.


WebObjects

For WebObjects 5.3 development and deployment environments, the WebObjects 5.3.3 update is also required. See this article for more information about the WebObjects 5.3.3 update.

For previous versions of WebObjects 5, please see this article for instructions for updating your time zone data.

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