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. 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
Labrador is also in 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 uses AST, but will switch to
UTC-4:30 starting from September, 2007.
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