Editing Western European Summer Time

{{Short description|Time zone (UTC+01:00)}}
{{Time zones of Europe}}
'''Western European Summer Time''' ('''WEST''', [[UTC+01:00]]) is a summer [[daylight saving time]] scheme, 1 hour ahead of [[Greenwich Mean Time]] and [[Coordinated Universal Time]]. It is used in:
* the [[Canary Islands]]
* [[Portugal]] (including [[Madeira]] but not the [[Azores]])
* the [[Faroe Islands]]

The following countries also use the same time zone for their daylight saving time but use a different title:
*[[United Kingdom]], which uses [[British Summer Time]] (BST) 
*[[Republic of Ireland|Ireland]], which uses [[Irish Standard Time]] (IST)<ref name="STANDARD TIME ACT, 1968">{{Cite web |url=http://www.acts.ie/en.act.1968.0023.1.html |title=STANDARD TIME ACT, 1968 |access-date=29 August 2010 |archive-date=7 May 2013 |archive-url=https://web.archive.org/web/20130507091943/http://www.acts.ie/en.act.1968.0023.1.html |url-status=dead }}</ref> ({{lang|ga|Am Caighdeánach na hÉireann}} (ACÉ)<ref>{{Cite web |url=http://www.acts.ie/ga.act.1968.0023.1.html |title=AN tACHT UM AM CAIGHDEÁNACH, 1968 |access-date=25 September 2007 |archive-date=3 November 2011 |archive-url=https://web.archive.org/web/20111103155812/http://www.acts.ie/ga.act.1968.0023.1.html |url-status=dead }}</ref>). Also sometimes erroneously referred to as  "Irish Summer Time" ({{lang|ga|Am Samhraidh na hÉireann}}).<ref>{{Cite web|url=http://www.timeanddate.com/library/abbreviations/timezones/eu/ist.html|title=timeanddate.com webpage erroneously referring to IST as "Irish Summer Time"|access-date=2009-08-27}}</ref><ref>{{Cite web|url=http://www.tcd.ie/Physics/Astrophysics/news.php|title=Example of Trinity College, Dublin using the term "Irish Summer Time"|publisher=[[Trinity College, Dublin]]|access-date=2009-08-27}}</ref>

The scheme runs from the last Sunday in March to the last Sunday in October each year. At both the start and end of the schemes, clock changes take place at 01:00 [[UTC+00:00]]. During the winter, [[Western European Time]] (WET, GMT+0 or [[UTC+00:00]]) is used.

The start and end dates of the scheme are asymmetrical in terms of daylight hours: the [[Spring (season)|vernal]] time of year with a similar amount of daylight to late October is mid-February, well before the start of summer time. The asymmetry reflects temperature more than the length of daylight.

Ireland observes Irish Standard Time during the summer months and changes to [[UTC+00:00]] in winter.<ref name="STANDARD TIME ACT, 1968"/> As Ireland's winter time period begins on the last Sunday in October and finishes on the last Sunday in March, the result is the same as if it observed summer time.

==Usage==
The following countries and territories use UTC+01:00 during the summer, between 1:00 UTC on the last Sunday of March and 1:00 UTC on the last Sunday of October.

*[[Canary Islands]], regularly since 1980 (rest of Spain is [[Central European Summer Time|CEST]], i.e. [[UTC+02:00]])
*[[Faroe Islands]], regularly since 1981
* [[Republic of Ireland|Ireland]]
** 1916–1939 summers IST
** 1940–1946 all year IST
** 1947–1968 summers IST
** 1968–1971 all year IST
** 1972– summers IST
* [[Portugal]]
** [[Continental Portugal]]<ref>{{cite web|title=Hora Legal em Portugal Continental [Standard and Summer Time in Continental Portugal]|url=http://oal.ul.pt/documentos/hora-legal-desde-1911.pdf|publisher=[[Astronomical Observatory of Lisbon]]|access-date=20 May 2014|language=pt}}</ref>
*** 1916–1921 summers WEST
*** 1924 summer WEST
*** 1926–1929 summers WEST
*** 1931–1932 summers WEST
*** 1934–1941 summers WEST
*** 1942–1945 summers WEST (1942–1945 midsummers Western European Midsummer Time|WEMT<ref>{{cite web|title=Time Changes in Lisbon over the years (1925–1949); Time Zone in Lisbon, Portugal|url=http://www.timeanddate.com/time/zone/portugal/lisbon|publisher=timeanddate.com|access-date=20 May 2014}}</ref><ref>{{cite web |url= http://statoids.com/tpt.html|title= Time Zones of Portugal|last1= Law|first1= Gwillim|date= 30 May 2001|website= Statoids |access-date= 20 May 2014}}</ref>=WEST+1)
*** 1946–1966 summers WEST
*** 1966–1976 all year WEST/[[Central European Time|CET]]
*** 1977–1992 summers WEST
*** 1992–1996 winters WEST/CET (1993–1995 summers [[Central European Summer Time|CEST]])
*** 1996– summers WEST
** [[Madeira]], regularly since 1982<ref>{{cite web|title=Decreto Regional n.º 5/82/M, de 3 de Abril [Regional Decree 5/82/M, 3 April 1982]|url=https://dre.pt/pdf1sdip/1982/04/07800/07770778.pdf|work=Diário da República, I Série, n.º 78, 7 de Abril de 1982|access-date=20 May 2014|pages=777–778|language=pt|date=7 April 1982}}</ref>
* The [[United Kingdom]]
** 1916–1939 summers BST
** 1940–1945 all year BST (1941–1945 summers BDST=BST+1)
** 1946 summer BST
** 1947 summer BST (1947 midsummer BDST=BST+1)
** 1948–1968 summers BST
** 1968–1971 all year BST
** 1972– summers BST

===Ireland===
{{main|Time in Ireland}}
In Ireland, since the Standard Time (Amendment) Act, 1971, Ireland has used [[UTC+01:00|UTC+1]] in summer (officially "standard time",<ref>
{{Cite web |url=http://www.irishstatutebook.ie/1968/en/act/pub/0023/index.html |title=Standard Time Act, 1968 |publisher=Attorney General |work=[[Irish Statute Book]] |date=15 July 1968}}
</ref> {{langx|ga|am caighdeánach}},<ref>
{{cite web|url=http://focal.ie/Search.aspx?term=Standard+Time|title=Standard time|work=[[Focal (lexicographical website)|Focal]]|access-date=17 August 2012}}
</ref> though usually called "summer time") and [[UTC+00:00|UTC+0]] in winter (officially "winter time").<ref>
{{Cite web|url=http://www.irishstatutebook.ie/1971/en/act/pub/0017/index.html |title=Standard Time (Amendment) Act, 1971 |publisher=Attorney General |work=Irish Statute Book |date=20 July 1971}}
</ref>

===Portugal===
{{main|Time in Portugal}}
[[Portugal]] moved to Central European Time and Central European Summer Time in 1992, but reverted to Western European Time in 1996 after concluding that energy savings were small, it had a disturbing effect on children's sleeping habits as it would not get dark until 22:00 or 22:30 in summer evenings, during winter mornings the sun was still rising at 9:00, with repercussions on standards of learning and school performance, and insurance companies reported a rise in the number of accidents.<ref>{{Cite web|url=https://www.theyworkforyou.com/lords/?gid=2006-03-24b.478.0 |title=Lighter Evenings (Experiment) Bill [HL]}}</ref>

===United Kingdom===
{{Main|British Summer Time}}

Starting in 1916, the dates for the beginning and end of BST each year were mandated by the [[Parliament of the United Kingdom]]. From 1940 to 1945, the country used British Summer Time in the winter months and British Double Summer Time, a further hour ahead of GMT, in the summer months. From 1968 to 1971, the country used BST throughout the year. In February 2002, the Summer Time Order 2002<ref name="SummerTime2002">{{Cite web|url=http://www.opsi.gov.uk/si/si2002/20020262.htm |title=Statutory Instrument 2002 No. 262—The Summer Time Order 2002}}</ref> changed the dates and times to match European rules for moving to and from daylight saving time.

== Start and end dates of British Summer Time and Irish Standard Time==
{| class="wikitable sortable"
! Year !! class="unsortable"| Begins (GMT) !! class="unsortable"| Ends (GMT) !! class="unsortable"| UK Notes !! class="unsortable"| Ireland Notes
|-
! 2025
| Sun 30 March 01:00 || Sun 26 October 01:00 || ||
|-
! 2024
| Sun 31 March 01:00 || Sun 27 October 01:00 || ||
|-
! 2023
| Sun 26 March 01:00 || Sun 29 October 01:00 || ||
|-
! 2022
| Sun 27 March 01:00 || Sun 30 October 01:00 || ||
|-
! 2021
| Sun 28 March 01:00 || Sun 31 October 01:00 || ||
|-
! 2020
| Sun 29 March 01:00 || Sun 25 October 01:00 || ||
|-
! 2019
| Sun 31 March 01:00 || Sun 27 October 01:00 || ||
|-
! 2018
| Sun 25 March 01:00 || Sun 28 October 01:00 || ||
|-
! 2017
| Sun 26 March 01:00 || Sun 29 October 01:00　|| ||
|-
! 2016
| Sun 27 March 01:00 || Sun 30 October 01:00 || ||
|-
! 2015
| Sun 29 March 01:00 || Sun 25 October 01:00 || ||
|-
! 2014
| Sun 30 March 01:00 || Sun 26 October 01:00 || ||
|-
! 2013
| Sun 31 March 01:00 || Sun 27 October 01:00 || ||
|-
! 2012
| Sun 25 March 01:00 || Sun 28 October 01:00 || ||
|-
! 2011
| Sun 27 March 01:00 || Sun 30 October 01:00 || ||
|-
! 2010
| Sun 28 March 01:00 || Sun 31 October 01:00 || ||
|-
! 2009
| Sun 29 March 01:00 || Sun 25 October 01:00 || ||
|-
! 2008
| Sun 30 March 01:00 || Sun 26 October 01:00 || ||
|-
! 2007
| Sun 25 March 01:00 || Sun 28 October 01:00 || ||
|-
! 2006
| Sun 26 March 01:00 || Sun 29 October 01:00 || ||
|-
! 2005
| Sun 27 March 01:00 || Sun 30 October 01:00 || ||
|-
! 2004
| Sun 28 March 01:00 || Sun 31 October 01:00 || ||
|-
! 2003
| Sun 30 March 01:00 || Sun 26 October 01:00 || ||
|-
! 2002
| Sun 31 March 01:00 || Sun 27 October 01:00 || UK adopts EU practice<ref name="SummerTime2002" /><ref name="2002 EU adopts">{{Cite web|url=http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32000L0084:EN:NOT |title=Directive 2000/84/EC of the European Parliament and of the Council of 19 January 2001 on summer-time arrangements|date=19 January 2001 }}</ref> || Ireland adopts EU Practice <ref name="2002 EU adopts" /><ref>{{Cite web|url=http://www.irishstatutebook.ie/2001/en/si/0506.html |title=Winter Time Order, 2001}}</ref>
|-
! 2001
| Sun 25 March 01:00 || Sun 28 October 01:00 || ||
|-
! 2000
| Sun 26 March 01:00 || Sun 29 October 01:00 || ||
|-
! 1999
| Sun 28 March 01:00 || Sun 31 October 01:00 || ||
|-
! 1998
| Sun 29 March 01:00 || Sun 25 October 01:00 || ||
|-
! 1997
| Sun 30 March 01:00 || Sun 26 October 01:00 || ||
|-
! 1996
| Sun 31 March 01:00 || Sun 27 October 01:00 || ||
|-
! 1995
| Sun 26 March 01:00 || Sun 22 October 01:00 || ||
|-
! 1994
| Sun 27 March 01:00 || Sun 23 October 01:00 || ||
|-
! 1993
| Sun 28 March 01:00 || Sun 24 October 01:00 || ||
|-
! 1992
| Sun 29 March 01:00 || Sun 25 October 01:00 || ||
|-
! 1991
| Sun 31 March 01:00 || Sun 27 October 01:00 || ||
|-
! 1990
| Sun 25 March 01:00 || Sun 28 October 01:00 || ||
|-
! 1989
| Sun 26 March 01:00 || Sun 29 October 01:00 || ||
|-
! 1988
| Sun 27 March 01:00 || Sun 23 October 01:00 || ||
|-
! 1987
| Sun 29 March 01:00 || Sun 25 October 01:00 || ||
|-
! 1986
| Sun 30 March 01:00 || Sun 26 October 01:00 || ||
|-
! 1985
| Sun 31 March 01:00 || Sun 27 October 01:00 || ||
|-
! 1984
| Sun 25 March 01:00 || Sun 28 October 01:00 || ||
|-
! 1983
| Sun 27 March 01:00 || Sun 23 October 01:00 || ||
|-
! 1982
| Sun 28 March 01:00 || Sun 24 October 01:00 || ||
|-
! 1981
| Sun 29 March 01:00 || Sun 25 October 01:00 || ||
|-
! 1980
| Sun 16 March 02:00 || Sun 26 October 02:00 || ||
|-
! 1979
| Sun 18 March 02:00 || Sun 28 October 02:00 || ||
|-
! 1978
| Sun 19 March 02:00 || Sun 29 October 02:00 || ||
|-
! 1977
| Sun 20 March 02:00 || Sun 23 October 02:00 || ||
|-
! 1976
| Sun 21 March 02:00 || Sun 24 October 02:00 || ||
|-
! 1975
| Sun 16 March 02:00 || Sun 26 October 02:00 || ||
|-
! 1974
| Sun 17 March 02:00 || Sun 27 October 02:00 || ||
|-
! 1973
| Sun 18 March 02:00 || Sun 28 October 02:00 || ||
|-
! 1972
| Sun 19 March 02:00 || Sun 29 October 02:00 || ||
|-
! 1971
|  || Sun 31 October 02:00 || BST all year ends || IST all year ends
|-
! 1970
|  ||  || BST all year || IST all year
|-
! 1969
|  ||   || BST all year || IST all year
|-
! 1968
| Sun 18 February 01:00 ||  || BST all year begins || IST all year begins
|-
! 1967
| Sun 19 March 02:00 || Sun 29 October 02:00 || ||
|-
! 1966
| Sun 20 March 02:00 || Sun 23 October 02:00 || ||
|-
! 1965
| Sun 21 March 02:00 || Sun 24 October 02:00 || ||
|-
! 1964
| Sun 22 March 02:00 || Sun 25 October 02:00 || ||
|-
! 1963
| Sun 31 March 02:00 || Sun 27 October 02:00 || ||
|-
! 1962
| Sun 25 March 02:00 || Sun 28 October 02:00 || ||
|-
! 1961
| Sun 26 March 02:00 || Sun 29 October 02:00 || ||
|-
! 1960
| Sun 10 April 02:00 || Sun 2 October 02:00 || ||
|-
! 1959
| Sun 12 April 02:00 || Sun 4 October 02:00 || ||
|-
! 1958
| Sun 20 April 02:00 || Sun 5 October 02:00 || ||
|-
! 1957
| Sun 14 April 02:00 || Sun 6 October 02:00 || ||
|-
! 1956
| Sun 22 April 02:00 || Sun 7 October 02:00 || ||
|-
! 1955
| Sun 17 April 02:00 || Sun 2 October 02:00 || ||
|-
! 1954
| Sun 11 April 02:00 || Sun 3 October 02:00 || ||
|-
! 1953
| Sun 19 April 02:00 || Sun 4 October 02:00 || ||
|-
! 1952
| Sun 20 April 02:00 || Sun 26 October 02:00 || ||
|-
! 1951
| Sun 15 April 02:00 || Sun 21 October 02:00 || ||
|-
! 1950
| Sun 16 April 02:00 || Sun 29 October 02:00 || ||
|-
! 1949
| Sun 3 April 02:00 || Sun 30 October 02:00 || ||
|-
! 1948
| Sun 14 March 02:00 || Sun 31 October 02:00 || ||
|-
! rowspan=3 | 1947
|  || Sun 2 November 02:00 || Back to GMT || Back to GMT
|-
| Sun 13 April 02:00 || Sun 10 August 02:00 || BDST (2 hours ahead) || IST / no DST
|-
| Sun 16 March 02:00 || || BST begins || IST begins
|-
! 1946
| Sun 14 April 02:00 || Sun 6 October 02:00 || || Back to GMT (Oct)
|-
! rowspan=2 | 1945
|  || Sun 7 October 02:00 || Back to GMT || IST
|-
| Mon 2 April 01:00 || Sun 15 July 01:00 || BDST (2 hours ahead) || IST / no DST
|-
! 1944
| Sun 2 April 01:00 || Sun 17 September 01:00 || BDST (2 hours ahead) || IST / no DST
|-
! 1943
| Sun 4 April 01:00 || Sun 15 August 01:00 || BDST (2 hours ahead)||  IST / no DST
|-
! 1942
| Sun 5 April 01:00 || Sun 9 August 01:00 || BDST (2 hours ahead) ||  IST / no DST
|-
! 1941
| Sun 4 May 01:00 || Sun 10 August 01:00 || BDST (2 hours ahead) || IST / no DST
|-
! 1940
| Sun 25 February 02:00 || || BST [[Military history of the United Kingdom during World War II|1940–1945]] || IST 1940–1946
|-
! 1939
| Sun 16 April 02:00 || Sun 19 November 02:00 || ||
|-
! 1938
| Sun 10 April 02:00 || Sun 2 October 02:00 || ||
|-
! 1937
| Sun 18 April 02:00 || Sun 3 October 02:00 || ||
|-
! 1936
| Sun 19 April 02:00 || Sun 4 October 02:00 || ||
|-
! 1935
| Sun 14 April 02:00 || Sun 6 October 02:00 || ||
|-
! 1934
| Sun 22 April 02:00 || Sun 7 October 02:00 || ||
|-
! 1933
| Sun 9 April 02:00 || Sun 8 October 02:00 || ||
|-
! 1932
| Sun 17 April 02:00 || Sun 2 October 02:00 || ||
|-
! 1931
| Sun 19 April 02:00 || Sun 4 October 02:00 || ||
|-
! 1930
| Sun 13 April 02:00 || Sun 5 October 02:00 || ||
|-
! 1929
| Sun 21 April 02:00 || Sun 6 October 02:00 || ||
|-
! 1928
| Sun 22 April 02:00 || Sun 7 October 02:00 || ||
|-
! 1927
| Sun 10 April 02:00 || Sun 2 October 02:00 || ||
|-
! 1926
| Sun 18 April 02:00 || Sun 3 October 02:00 || ||
|-
! 1925
| Sun 19 April 02:00 || Sun 4 October 02:00 || ||
|-
! 1924
| Sun 13 April 02:00 || Sun 21 September 02:00 || ||
|-
! 1923
| Sun 22 April 02:00 || Sun 16 September 02:00 || ||
|-
! 1922
| Sun 26 March 02:00 || Sun 8 October 02:00 || ||
|-
! 1921
| Sun 3 April 02:00 || Sun 2 October 02:00 || ||
|-
! 1920
| Sun 28 March 02:00 || Sun 24 October 02:00 || ||
|-
! 1919
| Sun 30 March 02:00 || Sun 28 September 02:00 || ||
|-
! 1918
| Sun 24 March 02:00 || Sun 29 September 02:00 || ||
|-
! 1917
| Sun 8 April 02:00 || Sun 16 September 02:00 || ||
|-
! 1916
| Sun 21 May 02:00 || Sun 1 October 02:00 || || Abolition of DMT
|}

Note: Until 1 October 1916 time in all of Ireland was based on [[Dublin Mean Time]], GMT − 25 minutes.

==References==
{{Reflist}}

==Further reading==
*Prerau, David. ''Saving the Daylight: Why We Put the Clocks Forward'' ({{ISBN|1-86207-796-7}}) — The Story of Summer Time/Daylight Saving Time with a focus on the UK

==External links==
*[http://www.savingthedaylight.com/dst/ A Brief History of BST/DST]
*[http://www.srcf.ucam.org/~jsm28/british-time/ History of legal time in Britain]
*[http://news.bbc.co.uk/2/hi/uk_news/england/west_yorkshire/3213979.stm BBC News report]: Safety call as clocks go back.
*[http://news.bbc.co.uk/2/hi/uk_news/scotland/8321809.stm BBC News report]: Tundra time call in clocks debate.
*[https://web.archive.org/web/20100331102636/http://www.parliament.uk/commons/lib/research/briefings/snsc-03796.pdf UK Government Report]: Overview of the pros and cons of British Summer Time.
*[https://web.archive.org/web/20060115024530/http://www.rospa.com/news/releases/2005/pr415_26_10_05_road.htm RoSPA Press Release]: RoSPA calls for switch to lighter nights to save lives
*[http://wwp.greenwichmeantime.com/info/bst2.htm BST FAQ]
*[https://web.archive.org/web/20080209113301/http://www.berr.gov.uk/employment/bank-public-holidays/bst/page12528.html Official British Government site listing Summer time dates for 2006–2011 inclusive] (Updated March 2008)
*[http://www.npl.co.uk/server.php?show=ConWebDoc.2714 Dates when BST began and ended]
*[https://raw.githubusercontent.com/eggert/tz/master/europe UNIX 'zoneinfo' file for Europe]: as well as including a full set of dates for all European countries, it includes many comments on the history of DST in those countries.
{{Use dmy dates|date=August 2019}}

[[Category:Time in the United Kingdom]]
[[Category:Time zones]]

[[eo:WEST]]