Atlantic Standard Time Zone

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

In Canada, the provinces of New Brunswick, Prince Edward Island, Nova Scotia, and small portions of Quebec (eastern Côte-Nord and the Magdalen Islands) are part of the Atlantic Standard Time Zone. Officially, the entirety of Newfoundland and Labrador observes Newfoundland Standard Time,^[1] but in practise Labrador uses the Atlantic Standard Time Zone.

Other parts of the world that keep time by subtracting four hours from UTC include Bermuda, in the North Atlantic; many Caribbean islands, including Puerto Rico, the US Virgin Islands; and several South American countries, such as Paraguay, Chile, Bolivia, and parts of Brazil. Venezuela 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 (GMT-3). In the southern hemisphere, it will be winter when the northern hemisphere is experiencing summer.

[edit] Major metropolitan areas

v • d • e Time zones in North America
Time Zone	UTC-10	UTC-9	UTC-8	UTC-7	UTC-6	UTC-5	UTC-4	UTC-3:30	UTC-3	UTC-2:30	UTC-2
Name	Hawaii-Aleutian Standard	Alaska Standard	Pacific Standard	Mountain Standard	Central Standard	Eastern Standard	Atlantic Standard	Newfoundland Standard	Saint Pierre and Miquelon Standard	Newfoundland Daylight	Saint Pierre and Miquelon Daylight
Name	Hawaii-Aleutian Standard	Hawaii-Aleutian Daylight	Alaska Daylight	Pacific Daylight	Mountain Daylight	Central Daylight	Eastern Daylight	Newfoundland Standard	Atlantic Daylight	Newfoundland Daylight	Saint Pierre and Miquelon Daylight