History
Historically, some or all of Argentina has observed daylight saving time during austral summer 1989–1990 through austral summer 1992–1993, and again in 1999−2000, 2007−2008, and 2008−2009.
The first official standardization took place on 25 September 1894.
The official time switched between UTC−4 and UTC−3 from 1920 to 1969, and then between UTC−3 and UTC−2 from 1974 to 1993. On 7 March 1993 it was fixed at UTC−3, called Argentina Time (ART)
Read more about this topic: Time In Argentina
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