Daylight saving time or summer time is the practice of advancing clocks during summer months by one hour so that evening daylight lasts an hour longer, while sacrificing normal sunrise times.
A clock is an instrument to indicate, keep, measure and co-ordinate time.
Notebook: Daylight-Saving Time by CBS
Typically, regions with summer time adjust clocks forward one hour close to the start of spring and adjust them backward in the autumn to standard time.
Standard time is the synchronization of clocks within a geographical area or region to a single time standard, rather than using solar time or a locally chosen meridian to establish a local mean time standard.
Twins' Daylight Saving Time Birth Results in Bizarre Age Twist by Good Morning America
American inventor and politician Benjamin Franklin proposed a form of daylight time in 1784.
Benjamin Franklin was one of the Founding Fathers of the United States.
He wrote an essay “An Economical Project for Diminishing the Cost of Light” to the editor of The Journal of Paris, suggesting, somewhat jokingly, that Parisians could economize candle usage by getting people out of bed earlier in the morning, making use of the natural morning light instead.
New Zealander George Hudson proposed the idea of daylight saving in 1895.
New Zealand is an island nation in the southwestern Pacific Ocean.
The German Empire and Austria-Hungary organized the first nationwide implementation, starting on April 30, 1916.
Austria-Hungary, also known by other names and often referred to as the Austro-Hungarian Empire in English-language sources, was a constitutional union of the Austrian Empire and the Kingdom of Hungary that existed from 1867 to 1918, when it collapsed as a result of defeat in World War I. The union was a result of the Austro-Hungarian Compromise of 1867 and came into existence on 30 March 1867, when the compromise was ratified by the Hungarian parliament.
The German Empire was the historical German nation state that existed from the unification of Germany in 1871 to the abdication of Kaiser Wilhelm II in November 1918, when Germany became a federal republic.
Many countries have used it at various times since then, particularly since the energy crisis of the 1970s.
The practice has both advocates and critics.
Putting clocks forward benefits retailing, sports, and other activities that exploit sunlight after working hours, but can cause problems for outdoor entertainment and other activities tied to sunlight, such as farming.
Though some early proponents of DST aimed to reduce evening use of incandescent lighting—once a primary use of electricity—today's heating and cooling usage patterns differ greatly, and research about how DST affects energy use is limited and contradictory.
DST clock shifts sometimes complicate timekeeping and can disrupt travel, billing, record keeping, medical devices, heavy equipment, and sleep patterns.
Computer software often adjusts clocks automatically, but policy changes by various jurisdictions of DST dates and timings may be confusing.