Daylight saving time - Revision history

Per.kuskan at 00:57, 4 July 2026

2026-07-04T00:57:04Z

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	~~'''Daylight saving time''' ('''DST''') is the practice~~ of ~~advancing~~ clocks, usually by one hour, during part of the year in order to extend evening daylight. Under this system, local time is shifted forward in spring and returned to standard time in autumn. The stated purpose is to make better use of natural daylight during the longer days of late spring and summer.		{{Short description\|Seasonal advancement of clocks}}

	DST is ~~used in many countries~~, mainly in Europe and North America~~, while other~~ regions remain on standard time year~~-round~~.		'''Daylight saving time''' ('''DST''') is the practice of advancing clocks during part of the year, usually by one hour, so that a greater share of daylight occurs during the evening according to local clock time. Regions using DST later return their clocks to [[standard time]]. The change does not alter the total amount of daylight. It changes the relationship between clock time and the natural times of sunrise and sunset.

			Daylight saving time is mainly used in Europe and North America. Other regions remain on standard time throughout the year, particularly where the length of daylight changes little between seasons.

	== History ==		== History ==
	The idea of ~~shifting clocks~~ to ~~better align~~ with daylight ~~has been~~ discussed ~~since~~ the 18th century. ~~A formal proposal was made by~~ New Zealand entomologist George Vernon Hudson in 1895. ~~The concept gained practical adoption~~ during the First World War~~, when several~~ European ~~countries~~ introduced ~~daylight saving time~~ in 1916 to conserve fuel.		The idea of changing clock time to correspond more closely with daylight was discussed during the 18th century. New Zealand entomologist George Vernon Hudson presented a formal proposal in 1895.

			Daylight saving time was first adopted on a broad scale during the First World War. European governments introduced seasonal clock changes in 1916 to reduce the use of artificial lighting and conserve fuel. Some countries discontinued the practice after the war.

	~~After the war, many countries discontinued DST, but it was~~ reintroduced in ~~various places~~ during the Second World War ~~and later~~ energy crises~~, particularly in~~ the 1970s. ~~Since then, some~~ countries ~~have maintained seasonal clock changes~~, while others ~~have abolished them~~.		Seasonal clock changes were reintroduced in parts of the world during the Second World War. Further adoption followed during the energy crises of the 1970s. Some countries later established regular annual schedules, while others returned permanently to standard time.

	== Operation ==		== Operation ==
	In ~~regions~~ that ~~observe~~ daylight saving time, clocks are ~~typically set~~ forward ~~by one hour in~~ spring and ~~set back by one hour in~~ autumn. The forward ~~change is often referred~~ to ~~as “spring forward~~,” and the ~~backward change as “fall back~~.”		In a region that observes daylight saving time, clocks are moved forward before the part of the year with longer evening daylight. They are moved back when the region returns to standard time. In the Northern Hemisphere, these changes usually occur during spring and autumn.

			The forward transition causes an interval of local clock time to be skipped. When clocks are moved back, an interval occurs twice. The exact transition dates and clock times are determined by each jurisdiction. Changes are generally scheduled during the night to reduce disruption.

	~~The shift creates~~ a ~~longer period~~ of ~~evening daylight during summer months~~. Sunrise and sunset times ~~are effectively adjusted relative to clock time~~, ~~though the total amount of daylight remains~~ unchanged.		During daylight saving time, a region normally uses a [[time zone]] offset that is one hour ahead of its standard offset from [[Coordinated Universal Time]]. Sunrise and sunset therefore occur at later clock times, although their astronomical timing is unchanged.

	~~Most countries that observe DST change their clocks at 01:00 or 02:00 local time~~ to ~~minimize disruption~~.		The phrases “spring forward” and “fall back” are commonly used in North America to describe the two transitions.

	== Global use ==		== Global use ==
	~~Daylight~~ saving time ~~is widely observed in Europe, including many states that~~ coordinate ~~clock changes~~ on ~~harmonized~~ dates. It is also used ~~in parts of North America, including~~ most of the United States and Canada.		Most European countries observe daylight saving time and coordinate their transitions on common dates. The system is also used across most of the United States and Canada, although some jurisdictions remain on standard time throughout the year.

	~~Many countries~~ near the equator ~~do not use DST~~ because ~~daylight hours~~ vary little ~~throughout the year~~. ~~Several~~ countries in Asia, Africa, ~~and South America~~ have ~~never adopted the system or have discontinued it~~.		Daylight saving time is uncommon near the equator because sunrise and sunset times vary little between seasons. Most countries in Asia do not currently use seasonal clock changes. The practice is also uncommon in Africa. Most South American countries remain on standard time, although individual countries have used DST during earlier periods.

	~~In recent years, some governments have debated ending~~ seasonal clock changes ~~and adopting~~ permanent standard time or permanent daylight saving time.		Governments periodically consider replacing seasonal clock changes with permanent standard time or permanent daylight saving time. Such proposals affect the legal time used throughout the year rather than the amount of available daylight.

	== Effects ==		== Effects ==
	~~Supporters~~ of daylight saving time ~~argue that it can reduce~~ energy consumption~~, promote~~ outdoor activity~~, and align daylight with typical work and school schedules~~.		The effect of daylight saving time on energy use depends on climate and patterns of electricity consumption. Reduced demand for evening lighting may be offset by increased use of heating or air conditioning. Studies conducted in different regions have therefore produced different results.

			Later evening daylight can provide more time for outdoor recreation after ordinary working or school hours. It may also affect commercial activity by changing when people travel or spend time outside their homes.

	~~Critics argue that the energy savings are limited or inconsistent~~ and ~~that clock changes may~~ disrupt sleep ~~patterns~~ and ~~daily routines~~. ~~Research findings on economic~~ and ~~health impacts vary by region~~.		The transitions between standard time and daylight saving time can temporarily disrupt sleep. They may also complicate transport schedules and electronic timekeeping. Systems that record local time must distinguish between the skipped interval during the forward transition and the repeated interval when clocks are moved back.

	== See also ==		== See also ==
	* [[Coordinated Universal Time]]		* [[Coordinated Universal Time]]
			* [[Greenwich Mean Time]]
			* [[Time zone]]

	[[Category:Time]]		[[Category:Time]]

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2026-06-20T22:51:36Z

Remove NATO and European Union mentions

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	== Global use ==		== Global use ==
	Daylight saving time is widely observed in Europe, including ~~all member~~ states ~~of the European Union, where~~ changes ~~occur~~ on harmonized dates. It is also used in parts of North America, including most of the United States and Canada.		Daylight saving time is widely observed in Europe, including many states that coordinate clock changes on harmonized dates. It is also used in parts of North America, including most of the United States and Canada.

	Many countries near the equator do not use DST because daylight hours vary little throughout the year. Several countries in Asia, Africa, and South America have never adopted the system or have discontinued it.		Many countries near the equator do not use DST because daylight hours vary little throughout the year. Several countries in Asia, Africa, and South America have never adopted the system or have discontinued it.

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	== See also ==		== See also ==
	* [[Coordinated Universal Time]]		* [[Coordinated Universal Time]]

			[[Category:Time]]
			[[Category:Time standards]]
			[[Category:Time zones]]
			[[Category:Technical documentation]]
			[[Category:Reference pages]]

Per.kuskan: Page created

2026-02-26T08:50:55Z

Page created

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'''Daylight saving time''' ('''DST''') is the practice of advancing clocks, usually by one hour, during part of the year in order to extend evening daylight. Under this system, local time is shifted forward in spring and returned to standard time in autumn. The stated purpose is to make better use of natural daylight during the longer days of late spring and summer.

DST is used in many countries, mainly in Europe and North America, while other regions remain on standard time year-round.

== History ==
The idea of shifting clocks to better align with daylight has been discussed since the 18th century. A formal proposal was made by New Zealand entomologist George Vernon Hudson in 1895. The concept gained practical adoption during the First World War, when several European countries introduced daylight saving time in 1916 to conserve fuel.

After the war, many countries discontinued DST, but it was reintroduced in various places during the Second World War and later energy crises, particularly in the 1970s. Since then, some countries have maintained seasonal clock changes, while others have abolished them.

== Operation ==
In regions that observe daylight saving time, clocks are typically set forward by one hour in spring and set back by one hour in autumn. The forward change is often referred to as “spring forward,” and the backward change as “fall back.”

The shift creates a longer period of evening daylight during summer months. Sunrise and sunset times are effectively adjusted relative to clock time, though the total amount of daylight remains unchanged.

Most countries that observe DST change their clocks at 01:00 or 02:00 local time to minimize disruption.

== Global use ==
Daylight saving time is widely observed in Europe, including all member states of the European Union, where changes occur on harmonized dates. It is also used in parts of North America, including most of the United States and Canada.

Many countries near the equator do not use DST because daylight hours vary little throughout the year. Several countries in Asia, Africa, and South America have never adopted the system or have discontinued it.

In recent years, some governments have debated ending seasonal clock changes and adopting permanent standard time or permanent daylight saving time.

== Effects ==
Supporters of daylight saving time argue that it can reduce energy consumption, promote outdoor activity, and align daylight with typical work and school schedules.

Critics argue that the energy savings are limited or inconsistent and that clock changes may disrupt sleep patterns and daily routines. Research findings on economic and health impacts vary by region.

== See also ==
* [[Coordinated Universal Time]]