I didn't know why. Now I do.
Daylight saving time - Wikipedia, the free encyclopedia: "Starting in 2007, most of the United States and Canada observe DST from the second Sunday in March to the first Sunday in November,[72] yielding 34 weeks of DST every year, which is 65% of the year. 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.[73]"
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