Yesterday, I got the MacOSX updates for the Daylight Saving Time’s change in the US.

Million of computers will be updated because in accordance with the Energy Policy Act of 2005, Daylight Saving Time has been expanded by three weeks this year. Beginning in 2007, the United States will observe Daylight Saving Time from the second Sunday in March (March 11) until the first Sunday in November (November 4). This represents a shift from ordinary Daylight Saving Time observance in the northern Hemisphere, with the period beginning two weeks earlier and ending one week later.

Why Is Daylight Saving Time Changing?

In an attempt to reduce energy consumption, the US Congress, in section 110 of the “Energy Policy Act of 2005″ announced plans to move the start and ending dates of Daylight Saving Time on the grounds that it allows more effective use of natural sunlight, diminishing the need for electric lighting during the “waking day.” All of Canada (except the regions that do not follow daylight saving) will also observe the new period to avoid possible economic losses from confusion with the United States. Bermuda has announced a similar plan. Studies will determine if this change remains permanent.


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