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Daylight Savings Time: Fast Facts

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Here's a look at what you need to know about Daylight Saving Time, a system to reduce electricity usage by extending daylight hours.

Facts: 
Sunday, November 3, 2013 - Daylight Saving Time will end at 2am. Set clocks back one hour.

Sunday, March 10, 2013 - Daylight Saving Time begins at 2am. Set clocks ahead one hour.

It is "Daylight Saving Time" (singular), not "Daylight Savings Time" (plural).

Beginning in 2007, Daylight Saving Time begins in the United States on the second Sunday in March and ends on the first Sunday in November.

Timeline: 
1784 - The idea of daylight saving is first conceived by Benjamin Franklin.

1914 - 1918 - Britain goes on DLS during World War I.

March 19, 1918 - The Standard Time Act establishes time zones and daylight savings. Daylight savings is repealed in 1919, but continues to be recognized in certain areas of the U.S.

1945 - 1966 - There is no federal law regarding Daylight Saving Time.

1966 - The Uniform Time Act of 1966 establishes the system of uniform Daylight Saving Time throughout the U.S. The dates are the last Sunday in April to the last Sunday in October. States can exempt themselves from participation.

1974 - 1975 - Congress extends DLS in order to save energy during the energy crisis.

1986 - 2006 - Daylight Saving Time begins on the first Sunday in April and ends on the last Sunday in October.

August 8, 2005 - President Bush signs the Energy Policy Act of 2005 into law. Part of the act will extend Daylight Saving Time starting in 2007, from the second Sunday in March to the first Sunday in November.

2007 - Under the new laws, all of Indiana now observes Daylight Saving Time, where only certain areas of the state did before.

Exceptions in the USA: 
In the US, Hawaii and most of Arizona do not follow DLS.

The U.S. territories of Guam, Puerto Rico, Virgin Islands and American Samoa also do not observe DLS.

What countries follow Daylight Saving Time? 
About 70 countries around the world observe DLS.

Many countries near the equator do not adjust their clocks for daylight saving.

Neither China nor Japan observe DLS.

Some countries refer to "Daylight Saving Time" as "Summer Time."

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