History
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 and explicitly preempted all state laws related to daylight saving time per the weights and measures power given to Congress in Article 1, Section 8 of the U.S. Constitution. The law was later amended in 1986 to move the uniform start date for DST to the first Sunday in April (effective 1987). The latest amendment, part of the Energy Policy Act of 2005, extends DST by four or five 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). However, the Department of Energy is required to report to Congress the impact of the DST extension by December 1, 2007 (nine months after the statute took effect) which the department has not done and the report is now overdue. If the DST extension failed to save energy, Congress may revert back to the old schedule set in 1986.
Read more about this topic: Uniform Time Act
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