View source for UTC+00:00

{{short description|Identifier for the UTC +0 offset}}
{{Infobox time zone | UTC = No}}
[[File:Timezones2011 UTC+0.png|thumb|300px|UTC±00:00: blue (January), orange (July), yellow (year-round), light blue (sea areas)]]
{{Time zones of Europe}}
'''UTC+00:00''' is an identifier for a [[UTC offset|time offset from UTC]] of +00:00. This time zone is the basis of [[Coordinated Universal Time]] (UTC) and all other time zones are based on it. In [[ISO 8601]], an example of the associated time would be written as 2069-01-01T12:12:34+00:00. It is also known by the following geographical or historical names:
*[[Greenwich Mean Time]]<ref name=tad/>
*[[Western European Time]]<ref name=tad/>
*Azores Summer Time<ref name=tad/>
*[[Eastern Greenland Summer Time]]<ref name=tad/>
*Western Sahara Standard Time<ref name=tad>{{cite web|url=https://www.timeanddate.com/time/zones/wet|title=Western European Time|publisher=TimeAndDate.com}}</ref>
*[[Coordinated Universal Time]]

==As standard time (Northern Hemisphere winter)==
{{main|Western European Time}}
Principal cities: [[London]], [[Manchester]], [[Birmingham]], [[Edinburgh]], [[Liverpool]], [[Bristol]], [[Belfast]], [[Glasgow]], [[Cardiff]], [[Dublin]], [[Limerick]], [[Las Palmas de Gran Canaria]], [[Santa Cruz de Tenerife]], [[Lisbon]], [[Porto]]

=== Europe ===
==== Western Europe ====
*Ireland (Irish Standard Time is UTC+01:00, see  explanation below)
*Portugal ([[Western European Time|WET]])
*United Kingdom and the adjacent [[Crown Dependencies]] ([[Channel Islands]] and the [[Isle of Man]]) ([[GMT]])
** ([[England]], [[Wales]], [[Scotland]] and [[Northern Ireland]])
*[[Faroe Islands]] ([[Western European Time|WET]])

==== Atlantic islands ====
*Portugal
** [[Madeira]] ([[Western European Time|WET]])
*Spain
** [[Canary Islands]] ([[Western European Time|WET]])

'''Notes:'''
#The westernmost point where UTC with DST is applied is [[El Hierro]], [[Canary Islands]], Spain ([[18th meridian west|18°00′ W]]). Time used there is 2 hours and 12 minutes ahead of physical time in the summer, making for the greatest discrepancy in the UTC time zone.
#The easternmost settlement where UTC with DST is applied is [[Lowestoft]] in [[Suffolk]], [[East Anglia]], UK (at just 1°45′ E).
#Morocco normally observes [[UTC+01:00]], but the clock is set back one hour during [[Ramadan]]. See [[Time in Morocco]] for further information.
#Whilst {{lang|la|[[de facto]]}} Ireland operates on the same time as the United Kingdom, its {{lang|la|[[de jure]]}} basis to do so differs. Whereas standard time in the UK is GMT in winter and [[British Summer Time|BST]] (daylight saving time) in summer, [[Irish Standard Time]] (UTC+01:00) is observed in summer and GMT is used in winter. For details, see below.

==As daylight saving time (Northern Hemisphere summer)==
===Europe===
====Arctic Ocean====
*[[Greenland]]
**[[Ittoqqortoormiit]] and surrounding area
*Portugal
**[[Azores]] islands

==As standard time (year-round)==
Principal cities: [[Reykjavík]], [[Accra]], [[Bamako]], [[Dakar]], [[Abidjan]], [[Conakry]], [[Ouagadougou]], [[São Tomé]], [[Bissau]], [[Monrovia]], [[Bamako]], [[Nouakchott]], [[Freetown]], [[Lomé]], [[Laayoune|El Aaiún (Laayoune)]], [[Tifariti]], [[Tindouf]]

===Africa===
====West Africa====
===== Greenwich Mean Time =====
* Burkina Faso
* Ivory Coast
* The Gambia
* Ghana
* Guinea
* Guinea-Bissau
* Liberia
* Mali
* Mauritania
*[[Sahrawi Arab Democratic Republic]] ''(disputed territory)''
* São Tomé and Príncipe (since 2018)
* Senegal
* Sierra Leone
* Togo

===Europe (and possessions)===
====Atlantic islands====
*Greenland
**[[Danmarkshavn]] and surrounding area
**[[Station Nord, Greenland|Station Nord]]<ref>{{Cite web |last=266738@au.dk |title=Metadata for monitoring activities |url=https://villumresearchstation.dk/metadata-for-monitoring-activities |access-date=2025-01-10 |website=villumresearchstation.dk |language=en}}</ref>
*Iceland
*United Kingdom
**[[Saint Helena, Ascension and Tristan da Cunha]]
***[[Saint Helena]]
***[[Ascension Island]]
***[[Tristan da Cunha]]

===Antarctica===
Some bases in [[Antarctica]]. {{see also|Time in Antarctica}}
*[[Norway]]
**[[Troll Station]]

'''Notes:'''
#The westernmost point where UTC with no DST is applied is [[Bjargtangar]], at the northwest peninsula of [[Iceland]] (24°32′ W). Time used there is 1 hour and 38 minutes ahead of physical time. This is the greatest deviation from physical time for UTC+00:00 with no DST.

== Discrepancies between use of UTC+00:00 as standard time rather than local solar time ==
{| class="wikitable"
! Colour !! Legal time vs local mean time
|-
| style="background: #8f8fbf;" |
| 1 h ± 30 m behind
|-
| style="background: #bfbfbf;" |
| 0 h ± 30 m
|-
| style="background: #bf8f8f;" |
| 1 h ± 30 m ahead
|-
| style="background: #bf6060;" |
| 2 h ± 30 m ahead
|-
| style="background: #bf0000;" |
| 3 h ± 30 m ahead
|}
[[Image:Tzdiff-Europe-winter.png|thumb|European winter]]
[[Image:Tzdiff-Europe-summer.png|thumb|European summer]]
Since legal, political, social and economic criteria, in addition to physical or geographical criteria, are used in the drawing of time zones, actual time zones do not precisely adhere to meridian lines. The UTC+00:00 time zone, were it determined purely by [[longitude]], would consist of the area between meridians 7°30′W and 7°30′E. However, in much of Western and Central Europe, despite lying between those two meridians, UTC+01:00 is used; similarly, there are European areas that use UTC, even though their physical time zone is [[UTC−01:00]] (e.g. most of Portugal), or [[UTC−02:00]] (the westernmost part of Iceland). Because the UTC+00:00 time zone in Europe is at its western edge, [[Lowestoft]] in the United Kingdom, at only 1°45′E, is the easternmost settlement in Europe in which UTC+00:00 is applied. 

===Countries and areas west of 22°30′W ("physical" UTC−02:00) that use UTC+00:00===
* The westernmost part of Iceland, including the northwest [[peninsula]] (the Westfjords) and its main town of [[Ísafjörður]], which is west of 22°30′W, uses UTC+00:00. [[Bjargtangar]], Iceland is the westernmost point in which UTC is applied.

===Countries and areas west of 7°30′W ("physical" UTC−01:00) that use UTC+00:00===
==== In Europe ====
* [[Canary Islands]] (Spain)
* Most of Portugal, including [[Lisbon]], [[Porto]], [[Braga]], [[Aveiro, Portugal|Aveiro]], and [[Coimbra]]. (Only the easternmost part, including cities such as [[Bragança (Portugal)|Bragança]] and [[Guarda, Portugal|Guarda]], lies east of 7°30′W.) [[Madeira]], at 17°W even further west, also employs UTC+00:00. 
* The western half of Ireland, including the cities of [[Cork (city)|Cork]], [[Limerick]], and [[Galway]]
* Westernmost tip of [[Northern Ireland]], including the county town of [[County Fermanagh]], [[Enniskillen]]
* Extreme westerly portion of the [[Outer Hebrides]], in the west of [[Scotland]]; for instance, [[Vatersay]], an inhabited island and the westernmost settlement of [[Great Britain]], lies at 7°54′W. If [[uninhabited island]]s or rocks are taken into account [[St Kilda, Scotland|St Kilda]], west of the Outer Hebrides, at 8°58′W, and [[Rockall]], at 13°41′W, should be included.
* Westernmost island of the [[Faroe Islands]] (autonomous region of Denmark), [[Mykines, Faroe Islands|Mykines]]
* Most of Iceland, including [[Reykjavík]]
* Northeastern part of [[Greenland]], including [[Danmarkshavn]]

==== In Africa ====
* Liberia
* Sierra Leone
* Guinea
* Guinea-Bissau
* Senegal
* The Gambia
* Sahrawi Arab Democratic Republic ''(disputed territory)''
* Most of Mauritania
* Southwesternmost part of Mali
* The very westernmost part of Ivory Coast

[[File:Greenwich mean time line.jpg|thumb| This arch that stretches over a highway indicates the [[IERS Reference Meridian]] (0°) in Spain.]]

==Countries that use UTC+01:00 as the basis for standard time although local solar time would suggest UTC+00:00==
{{hatnote|Countries between meridians 7°30′W and 7°30′E ("physical" UTC+00:00) that use UTC+01:00}}
{{more|UTC+01:00}}

=== In Europe ===
* Spain (except for the Canary Islands, which use UTC+00:00). Much of [[Galicia (Spain)|Galicia]] (and far western fringes of [[Extremadura]] and [[Andalusia]]) lie west of 7°30′W ("physical" UTC−01:00), whereas there is no Spanish territory that even approaches 7°30′E (the boundary of "physical" UTC+01:00). Spain's time is the direct result of [[Francisco Franco|Generalissimo Franco]]'s presidential order (published in {{Lang|es|[[Boletín Oficial del Estado]]}} of 8 March 1940)<ref>{{Cite web | url=http://www.boe.es/g/es/bases_datos/tifs.php?coleccion=gazeta&ref=1940/02362&anyo=1940&nbo=68&lim=A&pub=BOE&pco=1675&pfi=1676 | title=BOE Orden sobre adelanto de la hora legal en 60 minutos | access-date=2 December 2008 }}{{Dead link|date=January 2020 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> abandoning Greenwich Mean Time and advancing clocks one hour, effective from 23:00 on 16 March 1940. This is an excellent example of political criteria used in the drawing of time zones: the time change was passed "in consideration of the convenience from the national time marching in step according to that of other European countries".<ref>{{Cite web | url=http://www.boe.es/datos/imagenes/BOE/1940/068/A01675.tif | title=B.O.E. #68 03/08/1940 p.1675 | access-date=2 December 2008 }}</ref><ref name="BOE68p1676">{{Cite web | url=http://www.boe.es/datos/imagenes/BOE/1940/068/A01676.tif | title=B.O.E. #68 03/08/1940 p.1676 | access-date=2 December 2008 }}</ref> The presidential order (most likely enacted to be in synchrony with [[Nazi Germany]] and [[Fascist Italy (1922–1943)|Fascist Italy]]{{Citation needed|reason=Speculative|date=July 2024}}, with which the [[Franco regime]] was unofficially allied) included in its 5th article a provision for its future phase out,<ref name="BOE68p1676"/> which never took place. Due to this political decision, Spain is two hours ahead of its [[local mean time]] during the summer, one hour ahead in winter.<ref>{{Cite web | url=http://horariosenespana.com/publicaciones/espana-en-hora/habitos-y-horarios-espanoles.php#siete | title=Hábitos y horarios españoles | access-date=27 November 2008 | archive-url=https://web.archive.org/web/20090125151400/http://horariosenespana.com/publicaciones/espana-en-hora/habitos-y-horarios-espanoles.php#siete | archive-date=25 January 2009 | url-status=dead }}</ref>
* Andorra
* Belgium
* Most of France, including the cities of [[Paris]], [[Marseille]] and [[Lyon]]. Only small parts of [[Alsace]], [[Lorraine (region)|Lorraine]] and [[Provence]] are east of 7°30′E ("physical" UTC+1).
* Ireland ([[Irish Standard Time]] is used in summer,<ref>{{cite web|url=http://www.irishstatutebook.ie/1971/en/act/pub/0023/print.html|title=STANDARD TIME ACT, 1968|publisher=Office of the Attorney General, Ireland|access-date=29 June 2012}}</ref> GMT in winter:<ref>[http://www.irishstatutebook.ie/1971/en/act/pub/0017/index.html Standard Time (Amendment) Act, 1971{{spaced ndash}}Schedule 1] Irish Statute Book</ref> this is the reverse of the usual convention, but provides the same end results. See [[Time in the Republic of Ireland]]).
* Luxembourg
* Monaco
* Netherlands
* [[Gibraltar]] (United Kingdom)
*The very westernmost part of Germany
*Westernmost part of Switzerland
*The very northwesternmost part of Italy
*[[Bouvet Island]] and southwesternmost part of Norway

=== In Africa ===
* Benin
*[[Annobón]] Island (Equatorial Guinea)
* Western part of Niger
* Western part of Nigeria, including [[Lagos]]
* Most of Algeria, including [[Algiers]]
* Northeastern part of Morocco. Morocco normally uses UTC+01:00 but, in 2019, the country adopted UTC+00:00 during the month of [[Ramadan]].<ref>{{Cite web|title=Morocco Changes Its Clocks for Ramadan 2019|url=https://www.timeanddate.com/news/time/morocco-changes-clocks-2019.html|access-date=2021-10-08|website=timeanddate.com |language=en}}</ref>

==See also==
*[[Coordinated Universal Time]] (UTC), the basis for the world's civil time.

==References==
{{Reflist}}

==External links==
*{{commonscat-inline}}

{{UTC time offsets}}

{{DEFAULTSORT:Utc plus 00:00}}
[[Category:UTC offsets]]