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Argentina is located at a longitude that would naturally put it in the UTC−04:00 or UTC−05:00 time zone; however, it actually uses the UTC−03:00 time zone. Argentina determines whether to change clocks in observation of daylight saving time on a year-by-year basis, and individual provinces may opt out of the federal decision.
Standard Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset.
UTC−02:00 (Brasília time +1) – Some islands on the east coast of Brazil (Fernando de Noronha, Trindade and Martim Vaz, Rocas Atoll, Saint Peter and Saint Paul Archipelago) Time in Brazil: Mexico: 4: UTC−08:00 (Zone 4 or Northwest Zone) – State of Baja California
For example, between 1963-10-23 and 1963-12-09 in Brazil only the states of Minas Gerais, Espírito Santo, Rio de Janeiro, and São Paulo had summer time. However, a requested split from America/Sao_Paulo was rejected in 2010 with the reasoning that, since 1970, the clocks were the same in the whole region.
Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
Since 2009, Argentina is not observing daylight saving time (DST) and the entire country stays on UTC-03:00. San Luis Province, which was previously in a different time zone than most of the country and which formerly observed DST, decided in April 2010 not to change its clocks back and to stay on UTC-03:00 all year round.
From West to East and North to South, these are: Pampas region: Buenos Aires, Córdoba, Santa Fe, La Pampa and Entre Ríos; Argentine Northwest: Jujuy, Salta, Tucumán, Catamarca, Santiago del Estero and La Rioja
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 ...