daylight saving time


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Related to daylight saving time: Time zones

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 After World War I the law was repealed (1919).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 ?
Hilton Garden Inn began the late check-out promotion last year to commemorate the end of Daylight Saving Time with a 2 p.
For additional information on the Maxwell House Daylight Saving Time Wake-Up Call, including rules and program guidelines, please visit http://www.
Daylight Saving Time can be simple with the Auto Daylight Savings(TM) movement, which automatically adjusts for the time change, says Siciliano, Director of Special Markets and Advertising for leading clock manufacturer Howard Miller.
Clocks with the Auto Daylight Savings(TM) movement use a patented computer chip that automatically adjusts for Daylight Saving Time," said Siciliano, Director of Marketing for leading clock manufacturer Howard Miller.
That's why we are the official coffee of Daylight Saving Time and are offering our customers a FREE shot of espresso in any drink this Sunday and Monday.
This new version of Resource Scheduler also includes updates to comply with new dates of Daylight Saving Time as outlined in the Energy Policy Act of 2005 legislation passed by the United States Congress.
CAIRO: The Cabinet's decision to cancel the already confusing daylight saving time raised more questions as to whether implementing the system conserved energy to begin with.
Sabri adds that daylight saving time could be linked to reduced road traffic in the precincts of Cairo and enjoying the extra hour of daylight in the afternoon or evening with his children
ySTANBUL (CyHAN)- In yet more confusion over the end of daylight saving time in Turkey, the Medula bill tracking system of the Social Security Institution (SGK) crashed on Monday, preventing doctors and pharmacists from entering prescriptions into the system.
In 2008, after a two-year hiatus, Iran resumed Daylight Saving Time on Now Ruz for the first six months of the Persian year.
Daylight saving time has arrived, and many early risers feel they've been robbed of an hour of sleep.
CAIRO -- Egypt's sudden flip to daylight saving time Friday had everyone asking the same question: What time is it?