The Uniform Time Act
By 1966, some 100 million Americans were observing Daylight Saving Time based on their local laws and customs. Congress decided to step in and end the confusion, and to establish one pattern across the country. The Uniform Time Act of 1966 (15 U.S. Code Section 260a) [see law], signed into Public Law 89-387 on April 12, 1966, by President Lyndon Johnson, created Daylight Saving Time to begin on the last Sunday of April and to end on the last Sunday of October. Any State that wanted to be exempt from Daylight Saving Time could do so by passing a state law.
The Uniform Time Act of 1966 established a system of uniform (within each time zone) Daylight Saving Time throughout the U.S. and its possessions, exempting only those states in which the legislatures voted to keep the entire state on standard time.
In 1972, Congress revised the law to provide that, if a state was in two or more time zones, the state could exempt the part of the state that was in one time zone while providing that the part of the state in a different time zone would observe Daylight Saving Time. The Federal law was amended in 1986 to begin Daylight Saving Time on the first Sunday in April.
Under legislation enacted in 1986, Daylight Saving Time in the U.S. began at 2:00 a.m. on the first Sunday of April and ended at 2:00 a.m. on the last Sunday of October.
The Energy Policy Act of 2005 extended Daylight Saving Time in the U.S. beginning in 2007, though Congress retained the right to revert to the 1986 law should the change prove unpopular or if energy savings are not significant. Going from 2007 forward, Daylight Saving Time in the U.S.
- begins at 2:00 a.m. on the second Sunday of March and
- ends at 2:00 a.m. on the first Sunday of November
In most of the countries of Western Europe, including the countries that are members of the EU, Daylight Saving Time:
- begins at 1:00 a.m. GMT on the last Sunday of March and
- ends at 1:00 a.m. GMT on the last Sunday of October