Question

The part of the day you like the most

Answer 1

"DST" redirects here. For other uses, see DST (disambiguation).This article is about the concept of daylight saving time. For local implementations, see Daylight saving time by country."Daylight Saving" redirects here. For the play by Nick Enright, see Daylight Saving (play).Daylight saving time regions as of July 2016:  Northern hemisphere summer  Southern hemisphere summer  Formerly used daylight savings  Never used daylight savings

Daylight saving time (DST) 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. 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. People use the terms "spring forward" and "fall back" when referring to this.[1]

New Zealander George Hudson proposed the idea of daylight saving in 1895.[2] The German Empire and Austria-Hungary organized the first nationwide implementation, starting on April 30, 1916. 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.[1] Putting clocks forward benefits retailing, sports, and other activities that exploit sunlight after working hours,[3] but can cause problems for outdoor entertainment and other activities tied to sunlight, such as farming.[4][5] Though some early proponents of DST aimed to reduce evening use ofincandescent lighting—once a primary use of electricity[6]—today's heating and cooling usage patterns differ greatly, and research about how DST affects energy use is limited or contradictory.[7]

DST clock shifts sometimes complicate timekeeping, and can disrupt travel, billing, record keeping, medical devices, heavy equipment,[8] and sleep patterns.[9] Computer software often adjusts clocks automatically, but policy changes by various jurisdictions of DST dates and timings may be confusing.[10]

Contents  [hide] 1Rationale2History3Procedure4Politics5Dispute over benefits and drawbacks5.1Energy use5.2Economic effects5.3Public safety5.4Health5.5Complexity6Terminology7Computing7.1IANA time zone database7.2Microsoft Windows8Permanent daylight saving time9By country and region10References11Further reading12External links