Time in Argentina
Argentina is located at a longitude that would naturally put it in the or time zone; however, it actually uses the time zone. Argentina determines whether to observe daylight saving time on a year-by-year basis, and individual provinces may opt out of the federal decision. At present, Argentina does not observe daylight saving time. The Argentine Hydrographic Service maintains the official national time. History. The first official standardization took place on 31 October 1894. The official time switched between and from 1920 to 1969, and then between and from 1974 to 1993. Historically, some or  all of Argentina has observed daylight saving time in summer 1989–1990 to summer 1992–1993 and again in 2007−2009. On 7 March 1993, it was fixed at , called Argentina Time (ART) IANA time zone database. In the file zone.tab of the IANA time zone database Argentina has the following zones: