The end to daylight saving time is this weekend, meaning clocks in most parts of the U.S. will "fall back" one hour on Sunday, Nov. 3rd. The switch happens at 2 a.m. local time. Digital clocks, like the one on your phone, will automatically make the adjustment, but you will have to reset any analog clocks that you may have. So the sun will set an hour earlier, and rise an hour earlier.
Time zones in the U.S. were established by the Standard Time Act in 1918, which also introduced daylight savings, according to the U.S. Astronomical Application Department, a part of the U.S. Naval Observatory. The law was so controversial, daylight saving time was repealed in 1919, reinstated during World War II, and went on to become a state and local decision. But the the Uniform Time Act of 1966 made it a federal law again, although the start and end dates have changed over the years.
Since 2007, daylight saving time in the U.S. starts on the second Sunday in March and ends on the first Sunday in November. There are 2 states that do NOT switch their clocks, as Hawaii & most of Arizona remain on standard time throughout the year.
With the time change, it is also a good reminder to change the batteries in any smoke, or carbon-monoxide detectors in your home.