Time in Brazil
Approximately 64% of the Brazilian population live in areas that observe daylight saving time or summer time as it is officially called. These areas are the Southern, Southeast and Central-Western Brazilian states.
Brasília time +1 (UTC-02)
This is the standard time zone only on some offshore Atlantic islands. The only such island with a permanent population is Fernando de Noronha, with 2,837 inhabitants (2013 estimate), 0.0014% of Brazil's population. The other islands (Trindade, Martim Vaz, Rocas Atoll and Saint Peter and Saint Paul Archipelago) are uninhabited or have small rotating Brazilian Navy garrisons or seasonal teams of scientists.
This zone is at UTC−02:00. The zone does not use DST/summer time, but from October to February, it is on the same time as the South and Southeast of Brazil when these regions adopt summer time (UTC−02:00).
Brasília time, BRT (UTC-03)
The main time zone of Brazil corresponds to the time at the national capital city, Brasília. All the other time zones are given as offsets to it.
Besides the Federal District (which includes Brasília), it comprises the states in the Southeast Region, the South Region and the Northeast Region (except some islands), plus the states of Goiás, Tocantins, Pará and Amapá. Almost 94% of the Brazilian population live in this time zone, which covers about 60% of the country's land area.
Brasília time −1 (UTC-04)
Outside of summer time, this time zone corresponds to UTC-04; during summer time, it changes to UTC-03, but this change is not followed by all states. It is used in the states of Amazonas, Mato Grosso, Mato Grosso do Sul, Rondônia, and Roraima. Although this time zone covers about 40% of the land area of Brazil, little more than 6% of the country's population live there.
Brasília time −2 (UTC-05)
However, on June 24, 2008, these areas advanced their clocks by an hour, so that they became part of the UTC-04 time zone. In a non-binding referendum held on October 31, 2010, a majority of Acre voters voted in favour of returning the state to the UTC-05. Brazil's President, Dilma Rousseff, has enacted law 12.876, confirming that the time zone switch will occur on Sunday, November 10, 2013. According to the law, the state of Acre and 13 municipalities in the western part of the state of Amazonas, which is roughly defined by an imaginary line connecting the cities of Tabatinga and Porto Acre, will be 5 hours behind UTC after the switch.
Daylight saving time
Daylight saving time (DST; horário de verão in Portuguese) starts on the third Sunday of October and ends on the third Sunday of February. Occasionally, in years when the Carnival celebrations fall on the third Sunday of February, DST's ending is postponed to the following Sunday.
It is observed by Southern, Southeast and Central-Western Brazil ( i.e. the states of Rio Grande do Sul, Santa Catarina, Paraná, São Paulo, Rio de Janeiro, Espírito Santo, Minas Gerais, Goiás, Mato Grosso and Mato Grosso do Sul, plus the Federal District). This means that approximately 64% of the Brazilian population live in areas that observe daylight saving time.
During the 2011-12 summer, the Northeastern state of Bahia also observed daylight saving time as an experiment. In the 2012-13 summer, the Northern state of Tocantins observed it, also as a test, for the first time since its creation, in 1988. Starting from the 2013-14 summer, neither state will observe DST any more.
The clock is moved forward by one hour between the start and end dates, moving Brasília Official Time from UTC-03 to UTC-02; the other states that do not follow summer time observe a change of the offset to Brasília time.
IANA time zone database
|BR||-0127-04829||America/Belem||Amapa, E Para||−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||−02:00|
|BR||-2027-05437||America/Campo_Grande||Mato Grosso do Sul||−04:00||−03:00|
- IBGE (Brazilian Institute of Geography and Statistics) (2013-07-01). "Estimativas da População Residente nos Municípios Brasileiros com Data de Referência em 1º de Julho de 2013" (PDF) (in Portuguese). Retrieved 2013-10-20.
- "Brazil Abolishes Its Fourth Time Zone in 2008". Retrieved 2008-06-25.
- "Time Zone Change is Possible in Acre, Brazil".
- "Decreto 6.558 de 2008, sobre o Horário de Verão no Brasil" (in Portuguese). Retrieved 2008-11-08.
- "Decreto 7.584 de 2011, sobre o Horário de Verão no Brasil" (in Portuguese). Retrieved 2011-10-16.
- "Decreto 7.826 de 2012, sobre o Horário de Verão no Brasil" (in Portuguese). Retrieved 2012-10-19.