In August 2005, the United States Congress passed the Energy Policy Act, which changes the start and end of DST as observed in the United States. Some additional countries/regions are following the U.S. change. As a result, DST will start three weeks earlier on March 11, 2007, and end one week later on November 4, 2007 — resulting in a new DST period that is four weeks longer than previously observed. These dates are referred to in this article as the extended DST period.
1987 to 2006 Daylight saving time begins (shifts time one hour forward) at 2 A.M. on the first Sunday in April and ends (shifts time one hour back) at 2 A.M. on the last Sunday in October.
Starting in 2007 Daylight saving time begins at 2 A.M. on the second Sunday in March (three weeks earlier) and ends at 2 A.M. on the first Sunday in November (one week later).