Chile Time (Santiago)

Chile Time (CLT) is UTC-4 in standard time and UTC-3 during summer (CLST). Since Chile is in the Southern Hemisphere, its DST schedule is opposite to the Northern Hemisphere — clocks spring forward in August/September and fall back in April. Chile has had a turbulent relationship with DST, including a period from 2015-2019 where the country tried staying on summer time year-round (UTC-3), which was unpopular due to dark winter mornings in Santiago. The country reverted to the traditional DST schedule in 2019. Easter Island (Rapa Nui) uses its own timezone, EAST (UTC-6/UTC-5). Santiago is South America's most prosperous capital per capita and a major financial hub, home to the Santiago Stock Exchange and many multinational regional headquarters. Chile's long, narrow geography means it spans significant latitude but only one timezone (excluding Easter Island). The country is the world's largest copper producer, and mining operations in the Atacama Desert run on Santiago time. Chile's timezone decisions directly impact astronomical observatories in the north, which are among the world's most important.