Change to daylight saving time

The Energy Policy Act of 2005 was passed in August 2005 and changes the daylight saving time dates effective March 2007. Under the new law, clocks will be moved forward one hour on the second Sunday of March instead of the current first Sunday of April. Clocks will be set back an hour the first Sunday of November rather than the last Sunday of October. In North America, the changes apply to the US and Canada, but not Mexico.

Many computers and devices that have programming to adjust their internal time will require attention. Patches are available for recent Microsoft operating systems. See http://www.microsoft.com/windows/timezone/dst2007.mspx for documentation and patch download.

Access control and alarm panels often synchronize their time with a host computer. Since automatic unlocks, arm/disarm, and access decisions are generally based on the panel time, you should verify that your host is patched or manually set to the correct time on the change dates. Also, beware of the old change dates since some systems might erroneously change their clock on that date.