
This Sunday Americans in most states will move their clocks forward one hour in observance of Daylight Savings time. But what is daylight savings time?
"Daylight Saving Time was instituted in the United States during World War I in order to save energy for war production by taking advantage of the later hours of daylight between April and October. During World War II the federal government again required the states to observe the time change. Between the wars and after World War II, states and communities chose whether or not to observe Daylight Saving Time. In 1966, Congress passed the Uniform Time Act which standardized the length of Daylight Saving Time."
"Arizona (except some Indian Reservations), Hawaii, Puerto Rico, the U.S. Virgin Islands, and American Samoa have chosen not to observe Daylight Saving Time. This choice does make sense for the areas closer to the equator because the days are more consistent in length throughout the year."
"Other parts of the world observe Daylight Saving Time as well. While European nations have been taking advantage of the time change for decades, in 1996 the European Union (EU) standardized a EU-wide European Summer Time. This EU version of Daylight Saving Time runs from the last Sunday in March through the last Sunday in October."
"On Sunday, March 9 (the second Sunday in March) at 2 a.m., Daylight Saving Time begins in the United States. This is the second year that Daylight Saving Time is four weeks longer due to the passage of the Energy Policy Act in 2005. The Act, which extends Daylight Saving Time by four weeks from the second Sunday of March to the first Sunday of November, is expected to save 10,000 barrels of oil each day through reduced use of power by businesses during daylight hours."
From
Daylight Saving Time (Not Daylight "Savings" Time)" by Matt Rosenberg at About.com Geography