Environment

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Daylight-Saving Time Changed for First Time in Twenty Years

November 03, 2007 12:31 PM
by findingDulcinea Staff
Congress enacts new rules for daylight-saving time, expanding the daylight-saving period so that it now begins three weeks earlier, on the first weekend in March, and ends one week later, in the first week in November.

30-Second Summary

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For the first time in more than 20 years, the rules for daylight-saving time changed, on Aug. 8, 2005. The new time-keeping convention came into effect for the fist time this year.

Previously clocks were set forward one hour on the first Sunday in April and set back one hour on the last Sunday in October.

The result of this yearly time-shift is to move one hour of sunlight from the morning to the evening. The reason behind this shift is often debated; yet, most agree that one goal is to save money on energy.

Although Congress passed the Uniform Time Act of 1966, which standardized the start and end of daylight-saving time, federal law does not make it mandatory for any area to set the clocks back each year. Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands and the state of Arizona do not observe daylight-saving time.

Headline Links: Daylight-saving time impact

Background: Energy Policy Act of 2005, official U.S. time and smart clock problems

The Role of NIST

History: Daylight-saving time, 1966 Uniform Time Act, and Benjamin Franklin

From Unpopular Origins to Standardization

Opinions & Analysis: The candy lobby, and how much energy is actually saved

Reference Material: Computerized devices and international observation

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