Time in Brazil
Fernando de Noronha time +1 (GMT−02:00)
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 3,061 inhabitants (2019 estimate), 0.0015% of Brazil's population. The other islands (Trindade, 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.
Brasília time, BRT (GMT−03:00)
The main time zone of Brazil comprises the states in the South, Southeast and Northeast - Bahia 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. All other time zones are given as offsets to it. About 93% of the Brazilian population live in this time zone, which covers about 60% of the country's land area. It comprises 26 of the 28 largest metropolitan areas in Brazil.
Brasília time −1 (GMT−04:00)
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 34% of the land area of Brazil (an area larger than Argentina), slightly less than 6% of the country's population live there (about 12 million people, equivalent to the city of São Paulo).
Until 2008, the areas of the state of Pará west of the Xingu River and north of the Amazon River were also part of this time zone; then they joined the rest of the state in observing Brasília time (GMT−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 GMT−03:00.
Brasília time −2 (GMT−05:00)
This time zone was reinstated in 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, but in practice a somewhat larger area, because all municipalities that are at least partially west of that line may follow this time zone in their entirety). These areas cover only about 6% of the Brazilian territory (although that is still about the size of France) and have only about 0.6% of the country's population (little more than 1 million people).
On 24 June 2008, these areas advanced their clocks by an hour, so that they became part of the GMT−04:00 time zone. 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 GMT−05:00. On 30 October 2013, Brazilian President Dilma Rousseff enacted Law 12876, establishing that the time zone switch would occur on Sunday, 10 November 2013. Since then, the state of Acre and 13 municipalities in the southwestern part of the state of Amazonas are again 5 hours behind GMT.
Unofficially, 32 municipalities in eastern Mato Grosso, located in the Araguaia valley, observe GMT−03:00, Brasília time. This practice started in Barra do Garças in 1998. Banks and government services still observe the legal time in these locations (GMT–04:00).
Daylight saving time
Brazil observed daylight saving time (DST; Portuguese: 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.
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 64% of the Brazilian population. During DST, Brasília time moved from GMT−03:00 to GMT−02:00; the other states that did not follow DST observed a change of the offset to Brasília time.
Brazil abolished DST in 2019.
IANA time zone database
|BR||-0127-04829||America/Belem||Amapá, E Pará||−03:00||-|
|BR||-0343-03830||America/Fortaleza||NE Brazil (MA, PI, CE, RN, PB)||−03:00||-|
|BR||-2332-04637||America/Sao_Paulo||S & SE Brazil (GO, DF, MG, ES, RJ, SP, PR, SC, RS)||−03:00||-|
|BR||-2027-05437||America/Campo_Grande||Mato Grosso do Sul||−04:00||-|
- Subdirectorate for Legal Affairs. "Lei nº 12.876, de 30 de outubro de 2013" [Law no. 12,876 of 30 October 2013] (in Portuguese). The Presidency of the Federative Republic of Brazil. Retrieved 11 September 2020.
- Population estimates, Brazilian Institute of Geography and Statistics, 2019.
- Areas of the municipalities, Brazilian Institute of Geography and Statistics, 2018.
- The municipalities are Atalaia do Norte, Benjamin Constant, Boca do Acre, Eirunepé, Envira, Guajará, Ipixuna, Itamarati, Jutaí, Lábrea, Pauini, São Paulo de Olivença and Tabatinga.
- "Brazil Abolishes Its Fourth Time Zone in 2008". Retrieved 2008-06-25.
- "Time Zone Change is Possible in Acre and Bahía, Brazil".
- 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.
- No clock change for parts of Mato Grosso, Brazil, Timeanddate.com, 25 October 2011.
- Araguaia municipalities swap Brasilia time for that of Mato Grosso during summer time, Olhar Direto, 19 October 2013. (in Portuguese)
- Summer time begins and Araguaia starts following Mato Grosso time, Água Boa News, 10 October 2015. (in Portuguese)
- "Decrees on daylight saving time in Brazil" (in Portuguese). National Observatory of Brazil. Retrieved 2019-11-25.