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The Atlantic Standard Time Zone (AST) is a geographical region that keeps time by subtracting four hours from either Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT), resulting in UTC-4 or GMT-4. The clock time in this zone is based on the mean solar time of the 60th meridian west of the Greenwich Observatorymarker.

In Canadamarker, the provinces of New Brunswickmarker and Nova Scotiamarker reckon time specifically as an offset of 4 hours from Greenwich Mean time (GMT-4). (UTC is regularly adjusted by means of leap seconds to keep it synchronized to within 1 second of GMT.) Prince Edward Islandmarker and small portions of Quebecmarker (eastern Côte-Nordmarker and the Magdalen Islandsmarker) are also part of the Atlantic Standard Time Zone. Officially, the entirety of Newfoundland and Labradormarker observes Newfoundland Standard Time, but in practice most of Labrador uses the Atlantic Standard Time Zone.

Other parts of the world that keep time by subtracting four hours from UTC include Bermudamarker, in the North Atlanticmarker; many Caribbeanmarker islands, including Puerto Rico, the US Virgin Islandsmarker; and several South American countries, such as Paraguaymarker, Chilemarker, Boliviamarker, and parts of Brazilmarker. Venezuelamarker used AST until December 9, 2007, when it switched to UTC-4:30.

AST is known (where applicable) as Atlantic Daylight Time (ADT) during daylight saving time, and has one hour added to make it three hours behind GMT (UTC-3).

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