daylight saving time

(redirected from daylight savings)
Also found in: Dictionary, Thesaurus, Acronyms, Wikipedia.

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.
..... Click the link for more information.
. 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.
..... Click the link for more information.
 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.
..... Click the link for more information.
.

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 After World War I the law was repealed (1919).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 saving time may cost you more than an hour of sleep, it could cost you your life, according to a University of Colorado Boulder study that found an increase in fatal motor vehicle accidents the first six days after the clocks spring ahead.
Continuing a collaboration between helmet/ co-writer Dave Boyle and musician-turned-thesp Goh Nakamura that began with last year's "Surrogate Valentine," "Daylight Savings" offers more of the drolly comic black-and-white same.
"I was so excited to gain an hour from daylight savings time.
Now the UK government will consider supporting the move - called daylight savings - for a three-year trial, as long as Wales and Scotland agree.
Ministers appear set to support the Daylight Savings Bill - but they are tabling amendments requiring consultation with the devolved authorities in Scotland, Wales and Northern Ireland.
Ministers will now table amendments to the Daylight Savings Private Members Bill proposing consultation with each of the devolved administrations.
In compiling our 2011 tide charts for the book, we inadvertently corrected for Daylight Savings Time, when the original NOAA source data had already done so.
The Boomerang Effect is a national social media experiment produced by SERVE 60 and The Marcus Graham Project that takes place in multiple cities during the start of daylight savings time.
Daylight savings happens during the night, so I didn't know if it was really two o'clock, or I don't know if it's now two o'clock.
The incident occurred at 12:10 Alaska Daylight Savings Time in night visual meteorological conditions with ten miles of visibility.
As daylight savings time rolled around in mid-March this year, so did the 60-plus temperatures and some blue skies, along with a touch of spring fever.
The government had earlier announced enforcement of daylight savings time from 1st April to conserve energy.