|British Summer Time|
World map with the time zone highlighted
|01:01, 30 December 2020 GMT|
|Observance of DST|
|This time zone is only used for DST. For the rest of the year, GMT is used.|
|Western European Time / Greenwich Mean Time (UTC)|
|Western European Time / Greenwich Mean Time (UTC)|
|Western European Summer Time / British Summer Time / Irish Standard Time (UTC+1)|
|Central European Time (UTC+1)|
|Central European Summer Time (UTC+2)|
|Eastern European Time / Kaliningrad Time (UTC+2)|
|Eastern European Time (UTC+2)|
|Eastern European Summer Time (UTC+3)|
|Further-eastern European Time / Moscow Time / Turkey Time (UTC+3)|
During British Summer Time (BST), civil time in the United Kingdom is advanced one hour forward of Greenwich Mean Time (GMT) (in effect, changing the time zone from UTC+00:00 to UTC+01:00), so that mornings have one hour less daylight, and evenings one hour more.
BST begins at 01:00 GMT on the last Sunday of March and ends at 01:00 GMT (02:00 BST) on the last Sunday of October. Since 22 October 1995, the starting and finishing times of daylight saving time across the European Union have been aligned– for instance Central European Summer Time begins and ends on the same Sundays at exactly the same time (that is, 02:00 Central European Time, which is 01:00 GMT). Between 1972 and 1995, the BST period was defined as "beginning at two o'clock, Greenwich mean time, in the morning of the day after the third Saturday in March or, if that day is Easter Day, the day after the second Saturday in March, and ending at two o'clock, Greenwich mean time, in the morning of the day after the fourth Saturday in October."
The following table lists recent-past and near-future start and end dates of British Summer Time:
|2017||26 March||29 October|
|2018||25 March||28 October|
|2019||31 March||27 October|
|2020||29 March||25 October|
|2021||28 March||31 October|
|2022||27 March||30 October|
|2023||26 March||29 October|
British Summer Time was first established by the Summer Time Act 1916, after a campaign by builder William Willett. His original proposal was to move the clocks forward by 80 minutes, in 20-minute weekly steps on Sundays in April and by the reverse procedure in September.In 1916, BST began on 21 May and ended on 1 October. Willett never lived to see his idea implemented, having died in early 1915.
In the summers of 1941 to 1945, during the Second World War, Britain was two hours ahead of GMT and operating on British Double Summer Time (BDST). To bring this about, the clocks were not put back by an hour at the end of summer in 1940 (BST having started early, on 25 February 1940). In subsequent years, clocks continued to be advanced by one hour each spring (to BDST) and put back by an hour each autumn (to BST). On 15 July 1945, the clocks were put back by an hour, so BDST reverted to BST; the clocks were put back by an additional hour on 7 October 1945, so BST reverted to GMT for the winter of 1945.
In 1946, BST operated as normal (from April to October) but in 1947, BDST was re-introduced with effect from 13 April (BST having started on 16 March). The clocks were brought back in line with GMT at the end of summer in 1947, being put back by an hour on 10 August (to BST) and by another hour on 2 November (to GMT).
An inquiry during the winter of 1959–60, in which 180 national organisations were consulted, revealed a slight preference for a change to all-year GMT+1, but instead the length of summer time was extended as a trial.A further inquiry during 1966–1967 led the government of Harold Wilson to introduce the British Standard Time experiment, with Britain remaining on GMT+1 throughout the year. This took place between 27 October 1968 and 31 October 1971, when there was a reversion to the previous arrangement.
Analysis of accident data for the first two years of the experiment, published by HMSO in October 1970, indicated that while there had been an increase in casualties in the morning, there had been a substantially greater decrease in casualties in the evening, with a total of around 2,700 fewer people killed and seriously injured during the first two winters of the experiment, 14 (PDF p. 18) :23 at a time when about 1,000 people a day were killed or injured on the roads. However, the period coincided with the introduction of drink/drive legislation; the estimates were later modified downwards in 1989. :14 (PDF p. 18):
The trial was the subject of a House of Commons debate on 2 December 1970 25when, on a free vote, the House of Commons voted by 366 to 81 votes to end the experiment. :
Campaigners, including the Royal Society for the Prevention of Accidents (RoSPA) and environmental campaigners 10:10, have made recommendations that British Summer Time be maintained during the winter months, and that a "double summertime" be applied to the current British Summer Time period, putting the UK one hour ahead of GMT during winter, and two hours ahead during summer. This proposal is referred to as "Single/Double Summer Time" (SDST), and would effectively mean the UK adopting the same time zone as European countries such as France, Germany, and mainland Spain (Central European Time and Central European Summer Time).
RoSPA has suggested that this would reduce the number of accidents over this period as a result of the lighter evenings. RoSPA have called for the 1968–71 trial to be repeated with modern evaluation methods.
10:10's "Lighter Later" campaign, in addition to publicising the risk reductions described above, also highlights the potential energy benefits of Single/Double Summer Time, arguing that the change could "save almost 500,000 tonnes of CO2 each year, equivalent to taking 185,000 cars off the road permanently".
These proposals are opposed by some farmers and other outdoor workers and by many residents of Scotland and Northern Ireland, [ citation needed ].as it would mean that in northern Britain and Northern Ireland the winter sunrise would not occur until 10:00 or even later. However, in March 2010, the National Farmers' Union indicated that it was not against Single/Double Summer Time, with many farmers expressing a preference for the change. Other opponents of daylight saving measures say that darker mornings, especially in Scotland, could affect children going to school and people travelling to work
A YouGov poll taken in March 2015 [ citation needed ]suggested that 40% of the people surveyed would prefer an end to the practice of changing the clocks, while only 33% wanted to keep it (the rest were indifferent or not sure). A recent YouGov survey showed that 44% would prefer to keep changing the clocks as now and only 39% backed having constant summertime. 56% were against stopping changing the clocks in Scotland. Sunrise would be as late as 10 a.m. in the winter in northern parts. It is feared that colder icier roads combined with people still half asleep in the dark is bad for health and safety.
The current arrangement is now defined by the Summer Time Order 2002 which defines BST as "... the period beginning at one o'clock, Greenwich mean time, in the morning of the last Sunday in March and ending at one o'clock, Greenwich mean time, in the morning of the last Sunday in October." This period was stipulated by a directive (2000/84/EC) of the European Parliament which required European countries to implement a common summer time (as originally introduced in 1997, in Directive 97/44/EC).
In part because of Britain's longitudinal length, debate emerges most years over the applicability of BST, and the issue is the subject of parliamentary debate. In 2004, English MP Nigel Beard tabled a Private Member's Bill in the House of Commons proposing that England and Wales should be able to determine their own time independently of Scotland and Northern Ireland.
In 2005, Lord Tanlaw introduced the Lighter Evenings (Experiment) Billinto the House of Lords, which would advance winter and summer time by one hour for a three-year trial period at the discretion of "devolved bodies", allowing Scotland and Northern Ireland the option not to take part. The proposal was opposed by the government. The bill received its second reading on 24 March 2006; however, it did not pass into law. The Local Government Association has also called for such a trial.
The Daylight Saving Bill 2010–12, a private member's bill by Conservative backbench MP Rebecca Harris, would have required the government to conduct an analysis of the potential costs and benefits of advancing time by one hour for all, or part of, the year. If such an analysis were to find that a clock change would benefit the UK, the bill required that the government should then initiate a trial clock change to determine the full effects. 1[ failed verification ]:
In 2010, Prime Minister David Cameron stated he would seriously consider proposals in the bill. The bill was only likely to be passed with government support. Despite initial opposition in Scotland to the move, Cameron stated his preference was for the change to apply across the United Kingdom, stating "We are a United Kingdom. I want us to have a united time zone."A survey in late October 2010 of about 3,000 people for British energy firm npower suggested that a narrow majority of Scots may be in favour of this change, though the Scottish Government remained opposed.
The bill was debated again in Parliament in November 2011 and sent to committee in December 2011. Na h-Eileanan an Iar , argued that it would adversely affect the population of Northern Scotland, while Jacob Rees-Mogg, MP for North East Somerset, tried to introduce an amendment to give Somerset its own time zone, 15 minutes behind London, in order to highlight what he saw as the absurdities of the bill. With all its allocated time used up, the bill could proceed no further through Parliament.In January 2012, the bill was again debated on the floor of the House of Commons where it was filibustered out of Parliament by opponents. Angus MacNeil, MP for
In 2018, after conducting a public survey, the European Commission proposed to put an end to seasonal clock changes in the European Union with effect from 2019. The European Parliament supported this proposal; however, as at October 2020, the proposal is still awaiting approval from the Council of the European Union, without which it will not come into force. As of September 2018 [update] , the UK Government had "no plans" to end daylight saving.If the proposal is approved, implementation would be deferred until 2021. Each member state must choose whether to remain on its current summer time, in which case the last transition would be on the last Sunday of March 2021, or its current winter time, which would take permanent effect from the last Sunday of October 2021. Although the United Kingdom left the EU before any new directive became effective, EU rules continue to apply during the transition period (up until at least 31 December 2020). Thereafter, the UK could choose to make its own arrangements. If the UK were thus to continue observing summer and winter time, Northern Ireland would have a one-hour time difference for half the year either with the rest of Ireland or with the rest of the UK.
In July 2019, the House of Lords EU Internal Market Sub-Committee launched a new inquiry into the implications for the UK of the European changes, to "explore what preparations the Government needs to make and what factors should inform the UK's response."
Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London, reckoned from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon; as a consequence, it cannot be used to specify a precise time unless a context is given.
Daylight saving time (DST), also daylight savings time or daylight time and summer time, is the practice of advancing clocks during warmer months so that darkness falls later each day according to the clock. The typical implementation of DST is to set clocks forward by one hour in the spring and set clocks back by one hour in autumn to return to standard time. As a result, there is one 23-hour day in late winter or early spring and one 25-hour day in the autumn.
Western European Summer Time is a summer daylight saving time scheme, 1 hour ahead of Greenwich Mean Time and Coordinated Universal Time. It is used in:
The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, the state of Quintana Roo in Mexico, Panama in Central America, and Colombia, mainland Ecuador, Peru, and a small portion of westernmost Brazil in South America, along with certain Caribbean and Atlantic islands.
Central European Time (CET), used in most parts of Europe and a few North African countries, is a standard time which is 1 hour ahead of Coordinated Universal Time (UTC). The time offset from UTC can be written as UTC+01:00. The same standard time, UTC+01:00, is also known as Middle European Time and under other names like Berlin Time, Warsaw Time, Paris Time or Rome Time.
Western European Time is a time zone covering parts of western Europe and consists of countries using UTC±00:00. It is one of the three standard time zones in the European Union along with Central European Time and Eastern European Time.
Summer time in Europe is the variation of standard clock time that is applied in most European countries in the period between spring and autumn, during which clocks are advanced by one hour from the time observed in the rest of the year, with a view to making the most efficient use of seasonal daylight. It corresponds to the notion and practice of daylight saving time (DST) to be found in many other parts of the world.
Time in New Zealand is divided by law into two standard time zones. The main islands use New Zealand Standard Time (NZST), 12 hours in advance of Coordinated Universal Time (UTC) / military M (Mike), while the outlying Chatham Islands use Chatham Standard Time (CHAST), 12 hours 45 minutes in advance of UTC / military M^ (Mike-Three).
UTC+01:00 is an identifier for a time offset from UTC of +01:00. In ISO 8601, the associated time would be written as 2019-02-07T23:28:34+01:00. This time is used in:
Israel Summer Time, also in English, Israel Daylight Time (IDT) is the practice in Israel by which clocks are advanced by one hour, beginning on the Friday before the last Sunday of March, and ending on the last Sunday of October.
Australia uses three main time zones: Australian Western Standard Time, Australian Central Standard Time, and Australian Eastern Standard Time. Time is regulated by the individual state governments, some of which observe daylight saving time (DST). Australia's external territories observe different time zones.
The United Kingdom uses Greenwich Mean Time or Western European Time (UTC) and British Summer Time or Western European Summer Time (UTC+01:00).
Malaysian Standard Time or Malaysian Time (MYT) is the standard time used in Malaysia. It is 8 hours ahead of Greenwich Mean Time. The local mean time in Kuala Lumpur was originally GMT+06:46:46. Peninsular Malaysia used this local mean time until 1 January 1901, when they changed to Singapore mean time GMT+06:55:25. Between the end of the Second World War and the formation of Malaysia on 16 September 1963, it was known as British Malayan Standard Time, which was GMT+07:30. At 2330 hrs local time of 31 December 1981, people in Peninsular Malaysia adjusted their clocks and watches ahead by 30 minutes to become 00:00 hours local time of 1 January 1982, to match the time in use in East Malaysia, which is GMT+08:00. SGT (Singapore) followed on and uses the same until now.
Europe spans seven primary time zones, excluding summer time offsets. Most European countries use summer time and harmonise their summer time adjustments; see Summer time in Europe for details.
Metropolitan France uses Central European Time and Central European Summer Time. Daylight saving time is observed in Metropolitan France from the last Sunday in March to the last Sunday in October. With its overseas territories, France uses 12 different time zones, more than any other country in the world.
Ireland uses Irish Standard Time in the summer months and Greenwich Mean Time in the winter period..
As of 2017, daylight saving time is used in the following Asian countries:
Parts of Australia, New Zealand, Fiji and Samoa are areas of Oceania that currently observe daylight saving time (DST).
Spain has two time zones and observes daylight saving time. Spain mainly uses Central European Time (GMT+01:00) and Central European Summer Time (GMT+02:00) in Peninsular Spain, the Balearic Islands, Ceuta, Melilla and plazas de soberanía. In the Canary Islands, the time zone is Western European Time (GMT±00:00) and Western European Summer Time (GMT+01:00). Daylight saving time is observed from the last Sunday in March to the last Sunday in October throughout Spain.
Winter time is the practice of shifting the clock back during winter months, usually −1 hour. It is a form of daylight saving time which is the opposite compensation to the summer time. However, while summer time is widely applied, use of winter time has been and is very rare.