Time in Brazil#Brasília time (UTC−03:00)

This is the standard time zone only on a few small offshore Atlantic islands. The only such island with a permanent population is Fernando de Noronha, with 3,167 inhabitants (2022 census), 0.0016% of Brazil's population.{{cite web |url=https://sidra.ibge.gov.br/tabela/4714 |title=Tabela 4714 – população residente, área territorial e densidade demográfica |trans-title=Table 4714 – resident population, territorial area and population density |publisher=Brazilian Institute of Geography and Statistics |date=2022 |language=pt}} The other islands (Trindade and Martim Vaz, Rocas Atoll and Saint Peter and Saint Paul Archipelago) either are totally uninhabited or have small seasonally rotating Brazilian Navy garrisons or teams of scientists.

The main time zone of Brazil comprises the states in the South, Southeast and Northeast regions (except the small islands mentioned above), plus the states of Goiás, Tocantins, Pará and Amapá, and the Federal District, which includes the national capital city, Brasília. About 93% of the Brazilian population live in this time zone, which covers about 60% of the country's land area. It includes 26 of the 28 largest metropolitan areas in Brazil.

This time zone is used in the states of Mato Grosso, Mato Grosso do Sul, Rondônia, Roraima, and most of Amazonas. Although this time zone covers about 36% of the land area of Brazil (an area larger than Argentina), only about 6% of the country's population live there (about 12 million people, slightly more than the city of São Paulo). Thus, covering the country's remaining two metropolitan areas (Manaus, Boa Vista).

Until 2008, the areas of the state of Pará west of the Xingu River and north of the Amazon River (aka the northwestern part of the said state) were also part of this time zone; then they joined the rest of the state in observing Brasília time (UTC−03:00). Although other changes to Brazilian time zones enacted at that time have since been reverted (see below), western and northern Pará still remain in UTC−03:00.

This time zone was reinstated in late 2013, after having been abolished for over five years. It is used in the far-western tip of the country, which includes the entire state of Acre and the southwestern portion of the state of Amazonas (west of a line connecting the cities of Tabatinga and Porto Acre).{{efn|name=amazonas|The municipalities of Atalaia do Norte, Eirunepé, Envira, Guajará and Ipixuna are located entirely west of the line. Part of the municipalities of Benjamin Constant and Tabatinga, including their seats and most of their population, are also located west of the line. Part of the municipalities of Boca do Acre, Itamarati, Jutaí, Pauini and São Paulo de Olivença are located west of the line, but their seats and almost their entire population are located east of it.{{cite web |url=https://www.tre-am.jus.br/eleicoes/mapa-dos-locais-de-votacao |title=Mapa dos locais de votação |trans-title=Map of voting locations |publisher=Regional Electoral Court of Amazonas |date=9 August 2022 |language=pt}} Amaturá and Lábrea are sometimes cited as municipalities in UTC−05:00,{{cite web |url=https://www.tse.jus.br/comunicacao/noticias/2022/Outubro/votacao-em-todo-o-pais-seguira-o-horario-de-brasilia-df |title=Votação em todo o país seguirá o horário de Brasília (DF) |trans-title=Voting in the whole country will follow Brasília time |publisher=Superior Electoral Court |date=30 October 2022 |language=pt}}{{cite web |url=http://portal.mec.gov.br/ultimas-noticias/418-enem-946573306/70641-candidatos-do-amazonas-devem-ficar-atentos-ao-fuso-horario |title=Candidados do Amazonas devem ficar atentos ao fuso horário |trans-title=Applicants from Amazonas should be mindful of the time zone |publisher=Ministry of Education of Brazil |date=31 October 2018 |language=pt}} but they are located entirely east of the line. The seat of Lábrea uses UTC−04:00.{{cite web |url=http://www2.ifam.edu.br/campus/labrea/noticias/edital-pregao-eletronico-no-09-2022 |title=Pregão eletrônico nº 9/2022 |trans-title=Electronic auction no. 9/2022 |publisher=Federal Institute of Amazonas |date=25 July 2022 |language=pt}}}} These areas cover only about 4% of the Brazilian territory (although that is still about the size of Germany) and have only about 0.5% of the country's population (little more than one million people).

On 24 June 2008, these areas advanced their clocks by an hour, so that they became part of the UTC−04:00 time zone.{{cite web|title=Brazil Abolishes Its Fourth Time Zone in 2008|url=http://www.timeanddate.com/news/time/brazil-abolishes-fourth-time-zone.html|access-date=2008-06-25}} However, in a non-binding referendum held on 31 October 2010, a slight majority of Acre voters voted in favour of returning the state to UTC−05:00.{{cite web|title=Time Zone Change is Possible in Acre, Brazil|url=http://www.timeanddate.com/news/time/brazil-acre-time-zone.html}} On 30 October 2013, Brazilian President Dilma Rousseff enacted Law 12876, establishing that the time zone switch would occur on Sunday, 10 November 2013.{{cite web |url=http://www.planalto.gov.br/ccivil_03/_ato2011-2014/2013/lei/L12876.htm |title=Lei nº 12.876, de 30 de outubro de 2013 |language=pt |trans-title=Law no. 12,876 of 30 October 2013 |author=Subdirectorate for Legal Affairs |publisher=The Presidency of the Federative Republic of Brazil |access-date=11 September 2020}} Since then, the state of Acre and the southwestern part of the state of Amazonas{{efn|name=amazonas}} are again 5 hours behind UTC.

Unofficially, 32 municipalities in eastern Mato Grosso,{{efn|Água Boa, Alto Araguaia, Alto Boa Vista, Alto Taquari, Araguaiana, Araguainha, Barra do Garças, Bom Jesus do Araguaia, Campinápolis, Canabrava do Norte, Canarana, Cocalinho, Confresa, General Carneiro, Luciara, Nova Nazaré, Nova Xavantina, Novo Santo Antônio, Novo São Joaquim, Pontal do Araguaia, Ponte Branca, Porto Alegre do Norte, Querência, Ribeirão Cascalheira, Ribeirãozinho, Santa Cruz do Xingu, Santa Terezinha, São Félix do Araguaia, São José do Xingu, Serra Nova Dourada, Torixoréu and Vila Rica.}} located in the Araguaia valley, observe UTC−03:00, Brasília time.{{cite web |url=https://www.timeanddate.com/news/time/brazil-time-changes-2011.html |title=No clock change for parts of Mato Grosso, Brazil |publisher=Timeanddate.com |date=25 October 2011}}{{cite web |url=http://www.olhardireto.com.br/noticias/exibir.asp?id=344397 |title=Municípios do Araguaia trocam horário de Brasília por de MT durante horário de verão |trans-title=Araguaia municipalities swap Brasilia time for that of Mato Grosso during summer time |publisher=Olhar Direto |date=19 October 2013 |language=pt}}{{cite web |url=http://www.aguaboanews.com.br/noticias/exibir.asp?id=1847¬icia=comeca_horario_de_verao_e_araguaia_passa_a_seguir_horario_de_mt |title=Começa horário de verão e Araguaia passa a seguir horário de MT |trans-title=Summer time begins and Araguaia starts following Mato Grosso time |publisher=Água Boa News |date=10 October 2015 |language=pt}}

Unofficially, some municipalities in eastern Mato Grosso do Sul, such as Bataguassu, Aparecida do Taboado, Cassilândia and Chapadão do Sul, also observe UTC−03:00, Brasília time.{{cite web |url=https://www.jornaldoestadoms.com/2017/11/por-intermedio-de-eduardo-rocha-tecnico.html |title=Por intermédio de Eduardo Rocha, técnico da Energisa irá falar sobre o fornecimento de Bataguassu |trans-title=By mediation of Eduardo Rocha, an Energisa technician will talk about the supply of Bataguassu |publisher=Jornal do Estado |date=24 November 2017 |language=pt}}{{cite web |url=https://g1.globo.com/ms/mato-grosso-do-sul/noticia/2023/12/27/um-estado-dois-fusos-horarios-cidades-de-ms-geram-confusao-e-curiosidade-por-diferenca-de-uma-hora.ghtml |title=Um estado, 'dois' fusos: cidades de MS geram confusão e curiosidade por diferenças no horário |trans-title=One state, 'two' time zones: cities of MS generate confusion and curiosity due to differences in time |publisher=G1 |date=27 December 2023 |language=pt}}

{{Main|Daylight saving time in Brazil}}

Brazil observed daylight saving time (DST; {{langx|pt|horário de verão}}, "summer time") in the years of 1931–1933, 1949–1953, 1963–1968 and 1985–2019. Initially it applied to the whole country, but from 1988 it applied only to part of the country, usually the southern regions, where DST is more useful due to a larger seasonal variation in daylight duration. It typically lasted from October or November to February or March.{{cite web|title=Decrees on daylight saving time in Brazil|url=http://pcdsh01.on.br/DecHV.html|publisher=National Observatory of Brazil|access-date=2019-11-25|language=pt}}

The most recent DST rule specified advancing the time by one hour during the period from 00:00 on the first Sunday in November to 00:00 on the third Sunday in February (postponed by one week if the latter fell on carnival), applicable only to the South, Southeast and Central-West regions, which comprise about 65% of the Brazilian population. During DST, Brasília time moved from UTC−03:00 to UTC−02:00; the other states that did not follow DST observed a change of the offset to Brasília time.

Brazil abolished DST in 2019.

The IANA time zone database contains 16 zones for Brazil. Columns marked with * are from the file zone.tab of the database.

• Date and time notation in Brazil
• Lists of time zones

{{notelist}}

{{reflist}}

• [http://pcdsh01.on.br Time Service Division] of the National Observatory of Brazil
• [http://pcdsh01.on.br/Fusbr.htm Legal time in Brazil] {{in lang|pt}}

{{Americas topic|Time in}}

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Category:Geography of Brazil

Category:Time in South America