On Sunday, November 7, 2010 at 2AM, fall back as daylight saving time ends in the United States and Canada.
Daylight Saving Time (DST), or daylight savings as it is commonly called, starts on the second Sunday in March at 2AM and lasts until the first Sunday in November at 2AM.
It is commonly remembered by the phrase “spring forward, fall back.” During the ‘spring forward’ portion, much of the Northern Hemisphere moves their clocks forward one hour. During the ‘fall back,’ clocks are turned back one hour.
Daylight Saving Time, or daylight savings, was first instituted in the modern era by Germany and its allies during World War I. Daylight Saving Time was used as way to save coal during the war. Britain and the rest of Europe quickly followed suit.
The United States first adopted daylight savings in 1918.
In 2005, with the passage of the Energy Policy Act, Daylight Saving Time was extended one full month. Proponents of the legislation claimed the extra four weeks would save an average of 10,000 barrels of oil per day. With Daylight Saving Time, businesses will use natural daylight instead of electricity to provide light.
Hawaii, Puerto Rico, the U.S. Virgin Islands, America Samoa, and most of Arizona do not observe Daylight Saving Time. Closer to the equator, the average length of daylight changes little from winter to summer.
California Energy Commission