Manuel Méndez
Lugo, Spain

https://www.timeanddate.com/news/time/brazil-postpones-dst-2018.html

"Brazil Postpones Beginning of DST

Published 4-Oct-2018

The Brazilian authorities have moved the beginning of Daylight Saving Time (DST) from November 4 to November 18, 2018 to avoid interference with a nationwide university exam.

According to the announcement, the DST period in Brazil will begin at 00:00 (12:00 midnight) on November 18, 2018. The clock change was initially scheduled for November 4.

Clock changes in Brazil

Only some parts of Brazil have time changes (see below). Clocks in these areas will be advanced by 1 hour as DST begins.
Avoid Interference with University Exam

The deferral is designed to prevent the clock change from coinciding with the Exame Nacional do Ensino Médio (ENEM), a nationwide high school exam scheduled for November 4-11.

The beginning of DST shortens the night by one hour, resulting in less sleep, potential health risks, and putting even more strain on students trying to prepare for Brazil's most important university entrance exam.
States Using DST in Brazil

Only some Brazilian states observe yearly clock changes. They are:

    São Paulo
    Rio de Janeiro
    Distrito Federal
    Santa Catarina
    Paraná
    Goiás
    Rio Grande do Sul
    Mato Grosso Do Sul
    Espírito Santo
    Minas Gerais
    Mato Grosso (with some exceptions)


Brazil has four time zones, stretching from UTC-2 to UTC-5 (standard time):

UTC-2: includes areas such as the archipelago of Fernando de Noronha. UTC-3: this is largest time zone, comprising eastern and central areas, and including all states bordering the Atlantic coast (except some islands), from Pará and Amapá in the north to Rio Grande do Sul in the south; includes the Brazilian Federal District with the capital Brasilia. UTC-4: includes the states of Mato Grosso, Mato Grosso do Sul, Rondônia, Roraima, and most of Amazonas. UTC-5: comprises the state of Acre and the westernmost part of Amazonas (west of Tabatinga / Porto Acre). "
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