In the United States, the Uniform Time Act is a federal law, enacted in 1966, whose effect was to simplify the official pattern of where and when Daylight saving time (DST) is applied within the U.S.
Previous to this law, each state worked out its own scheme for the dates of beginning and ending DST, and in some cases, which parts of the state should use it.
Since the act's date of effectiveness, states that apply DST at all officially
apply it to the whole state,
begin it at 2 AM on the first Sunday in April, and
end it at 2 AM on the last Sunday in October.
While there are a few areas where de facto differences within states exist, the overall pattern is simple enough, and close enough to actual practice, that it is effective and efficient
for repeat travelers, and repeat users of long-distance telephone service, to learn the basic pattern, and
for those in areas where de facto exceptions apply to mention the fact to those likely to be affected by it.
The law as originally written required states that observe DST to begin it at 02:00 local time on the last Sunday in April and to end it at 02:00 local time on the last Sunday in October.
The latest amendment, part of the Energy Policy Act of 2005, will extend DST by four weeks by moving the uniform start date for DST to the second Sunday in March and the end date to the first Sunday in November (effective 2007).
if the state is divided by a time zone boundary, that the exemption apply statewide or to the entire part of the state on one side of the boundary.
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