Some references:

[1] http://en.wikipedia.org/wiki/Daylight_saving_time

Starting in 2007, most of the United States and Canada observe DST
from the second Sunday in March to the first Sunday in November.

[2] http://webexhibits.org/daylightsaving/b.html

Beginning in 2007, most of the United States begins Daylight Saving
Time at 2:00 a.m. on the second Sunday in March and reverts to
standard time on the first Sunday in November. In the U.S., each time
zone switches at a different time.

-- 
Kuang He



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