(The following information is from the U.S. Department of Transportation website.)
WASHINGTON, D.C. — Most of the nation will return to standard time at 2 a.m. Sunday, Oct. 31, when clocks will be set back one hour. The change will provide an additional hour of daylight in the morning.
Under law, daylight saving time is observed from the first Sunday in April to the last Sunday in October.
The federal law does not require any area to observe daylight saving time. But if a state chooses to observe daylight time, it must follow the starting and ending dates set by the law.
In those parts of the country that do not observe daylight time, no resetting of clocks is required. Those states and territories include Arizona, Hawaii, the part of Indiana located in the Eastern time zone, Puerto Rico, the Virgin Islands and American Samoa.
Congress, in the Uniform Time Act of 1966, established uniform dates for daylight saving time and transferred responsibility for the time laws to the Department of Transportation from the Interstate Commerce Commission.