daylight saving time

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daylight saving time

(DST), time observed when clocks and other timepieces are set ahead so that the sun will rise and set later in the day as measured by civil timecivil time,
local time based on universal time. Civil time may be formally defined as mean solar time plus 12 hr; the civil day begins at midnight, while the mean solar day begins at noon.
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. The amount of daylight on a given dayday,
period of time for the earth to rotate once on its axis. The ordinary day, or solar day, is measured relative to the sun, being the time between successive passages of the sun over a stationary observer's celestial meridian.
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 of the year at a given latitude is fixed, but over the year the hours of sunrise and sunset vary from day to day. During the summer months, the sun rises earlier and sets later and there are more hours of daylight. If clocks and other timepieces are set ahead in the spring by some amount (usually one hour), the sun will rise and set later in the day as measured by those clocks. This provides more usable hours of daylight for activities that occur in the afternoon and evening, such as outdoor recreation. Daylight saving time can also be a means of conserving electrical and other forms of energy. In the fall, as the period of daylight grows shorter, clocks are set back to correspond to standard timestandard time,
civil time used within a given time zone. The earth is divided into 24 time zones, each of which is about 15° of longitude wide and corresponds to one hour of time. Within a zone all civil clocks are set to the same local solar time.
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.

Benjamin Franklin, when serving as U.S. minister to France, wrote an article recommending earlier opening and closing of shops to save the cost of lighting. In England, William Willett in 1907 began to urge the adoption of daylight saving time. During World War I the plan was adopted in England, Germany, France, and many other countries. In the United States, Robert Garland of Pittsburgh was a leading influence in securing the introduction and passage of a law (signed by President Wilson on Mar. 31, 1918) establishing daylight saving time in the United States. After World War I the law was repealed (1919). In World War II, however, national daylight saving time was reestablished by law on a year-round basis. National year-round daylight saving time was adopted as a fuel-saving measure during the energy crisis of the winter of 1973–74. In late 1974, standard time was reinstituted for the winter period. In 1987 federal legislation fixed the period of daylight saving time in the United States as the first Sunday (previously the last Sunday) in April to the last Sunday in October; it was expanded in 2005 (effective 2007) to extend from the second Sunday in March to the first Sunday in November. Arizona and Hawaii do not use daylight saving time.

daylight saving time

[¦dā‚līt ‚sāv·iŋ ‚tīm]
(astronomy)
A variation of zone time, usually 1 hour more advanced than standard time, frequently kept during the summer to make better use of daylight. Also known as summer time.
References in periodicals archive ?
Daylight savings time is used in over 70 countries--essentially, in every developed nation other than Japan, in spite of the Japanese being dependent on imports for almost all of their energy.
But the truth is, after the initial shock wears off, Daylight Savings Time can be a great thing - after all, more daylight means more time to spend browsing for the perfect Jovani designer dresses.
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Monthly calls reporting out-of-service street lights doubled in October during the city's Operation Bright Lights campaign, which runs twice a year, coinciding with the beginning and ending of Daylight Savings Time, Los Angeles officials said.
The winter and summer daylight savings time were introduced in Bulgaria in 1979 while they were introduced for the first time ever in 1908 in Great Britain to optimize the daylight hours.
Rayovac is revving up for Daylight Savings Time by offering a host of engaging activities, fun giveaways and tips for sprucing up your fire safety plan to keep your family safe.
Operation Bright Lights, sponsored by the Los Angeles Bureau of Street Lighting, begins today to coincide with the start of Daylight Savings Time, city officials said.
A telephonic replay of the conference call will be available from Noon Eastern Daylight Savings Time, Monday, May 05, 2008 through Noon Eastern Daylight Savings Time Sunday, May 11, 2008, at the above Website or via dial-in at 1-888-203-1112 for U.
At 4 am Sunday, October 28, Bulgaria will turn the clocks back one hour to winter daylight savings time until the last Sunday in March, 2013.
maker of Brez premium nasal breathing aids, the first commercially available device for inside the nose that is clinically proven to reduce snoring and increase overall sleep quality for the bed partner, today released five tips to help consumers easily transition to Daylight Savings Time.
It appeared there was legitimate concern about a sizable playoff on the first day of sunset-hastened daylight savings time.
Customers Can Rely On the Nation's Most Reliable Wireless Network To Stay On Time When Daylight Savings Time Ends This Year