Daylight Saving Time

Impact of Daylight Saving Time Changes on Network Products

Last Updated: 02/07/2007

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Overview
Beginning March 11, 2007, Daylight Saving Time (DST) start and end dates for the United States will transition to comply with the Energy Policy Act of 2005. Under the new law, Daylight Saving Time will begin the second Sunday of March and end the first Sunday of November, extending the timeframe by four weeks. Due to this DST change, operating system and application software updates may be required to ensure that the system clock on HP products is accurate.

This is not unique to HP products. All devices that automatically adjust Daylight Saving Time and that support operating systems or rely on a local time zone that observes DST will be affected by the 2007 DST change.

U.S. 2007 Daylight Saving Time Changes

2006		2007
U.S. DST Start	U.S. DST End	U.S. DST Start	U.S. DST End
First Sunday in April	Last Sunday in October	Second Sunday in March	First Sunday in November
2 April 2006	29 October 2006	11 March 2007	4 November 2007

Other Countries Affected by the Change
Several countries other than United States of America are also implementing the same DST change (Canada, Bermuda), and other countries are expected to make similar changes. For a complete listing of Worldwide Daylight Saving Time schedules, including countries that are changing along with the United States, refer to the Worldwide Daylight Saving Reference Page.

Why care about DST?

You are affected by the new DST change if:

You are running a computer system in the USA, Canada, or Bermuda, particularly if the system is running an application that performs time-sensitive functions, such as scheduling or creation/validation of time or date stamps.
You are outside of the USA, Canada or Bermuda but are running a computer system that interacts with or is integrated with systems in the USA, Canada or Bermuda that have transitioned to the new DST rules.

HP is providing patches or updates that will address the changes for your products as the result of the U.S. 2007 DST law. Utilize this information to perform assessment of your HP products. In some rare circumstances, based on your particular configuration and applications, you may encounter a DST issue that HP or your third party software vendor has not addressed, if so please contact HP Support. This site is subject to change. Please check back for updates.

HP Product Assessment of U.S. 2007 DST Impact

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Product	DST Summary for Product
Procurve Networking .	ProCurve, the world's #2 networking vendor, has a convenient table listing DST solutions for its LAN Edge switches, LAN Core switches, Wireless LAN, WAN products, and network management software. Daylight Saving Information

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