Don't forget to change your clocks Sunday Morning at 2:00 A.M.
Governments often promote DST as an energy conservation measure because it substitutes summer afternoon sunlight for electrical lighting. However, in some cases DST can increase energy costs.
The 2007 U.S. change was part of the Energy Policy Act of 2005; previously, from 1987 through 2006, the start and end dates were the first Sunday in April and the last Sunday in October, and Congress retains the right to go back to the previous dates once an energy consumption study is done.
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