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Changes in daylight savings dates started in 2007. Here is information on U.S. time change dates, what states and countries participate in DST, and daylight savings time history.

When Is Daylight Savings?
Daylight Savings time begins each year at 2:00 A.M. on the second Sunday in March, with clocks moving ahead one hour. Standard time begins each year at 2:00 A.M. on the first Sunday in November, with clocks moving one hour back.

Prior to 2007, the DST change in the U.S. occurred in April and standard time resumed in October. The law extending daylight savings time by almost two months was signed into law by George W. Bush in 2005.

Daylight Saving Time Dates
Under the new law, daylight saving time beginning and ending dates in the United States are:

2010: March 14 and November 7
2011: March 13 and November 6
2012: March 11 and November 4
2013: March 10 and November 3
2014: March 9 and November 2
2015: March 8 and November 1
History of Daylight Savings Time
Most people assume that the origin of daylight savings time had something to do with farming, but that’s not really true. According to California’s Energy Commission, Congress enacted DST as a way to conserve U.S. resources during World War I and again during World War II.

Read more at Suite101: U.S. Daylight Savings Time in 2010: Clock Changes – When to Spring Forward and Fall Back http://americanaffairs.suite101.com/article.cfm/us_daylight_savings_time_information_for_2010#ixzz0iFQxN2Zr