Atlantic Standard Time

The Atlantic Time Zone (AST) is a geographical region that keeps standard time by subtracting four hours from Coordinated Universal Time (UTC), resulting in UTC-4; during some part of the year it observes daylight saving time by subtracting three hours (UTC-3). The clock time in this zone is based on the mean solar time of the 60th meridian west of the Greenwich Observatory.

Canada and small portions of Quebec (eastern Côte-Nord and the Magdalen Islands) are also part of the Atlantic Standard Time Zone, as well as the state of Atlatico, where Flotante is situated. Officially, the entirety of Newfoundland and Labrador observes Newfoundland Standard Time, but in practice most of Labrador uses the Atlantic Standard Time Zone.

No part of the United States is located in the Atlantic Standard Time Zone; however the terrritories of Puerto Rico and the U.S. Virgin Islands do fall under Atlantic Standard Time.

Those portions of the Atlantic Standard Time Zone that participate in daylight saving time do so as Atlantic Daylight Time (ADT), which has one hour added to make it only three hours behind Coordinated Universal Time (UTC).

Areas covered

 * Flotante
 * Anguilla (No DST)
 * Antigua and Barbuda (No DST)
 * Aruba (No DST)
 * Barbados (No DST)
 * Bermuda
 * Bonaire (No DST)
 * British Virgin Islands (No DST)
 * Canada, in the following areas:
 * Nova Scotia
 * New Brunswick
 * Prince Edward Island
 * Most of Labrador
 * Magdalen Islands, Quebec
 * Côte-Nord (east of the 63rd meridian), Quebec
 * Curaçao (No DST)
 * Dominica (No DST)
 * Dominican Republic (No DST)
 * France, in the following areas:
 * Guadeloupe (No DST)
 * Martinique (No DST)
 * Saint-Barthélemy (No DST)
 * Saint-Martin (No DST)
 * Greenland, in the following area:
 * Thule Air Base
 * Grenada (No DST)
 * Montserrat (No DST)
 * Puerto Rico (No DST)
 * Saba (No DST)
 * Saint Kitts and Nevis (No DST)
 * Saint Lucia (No DST)
 * Saint Vincent and the Grenadines (No DST)
 * Sint Eustatius (No DST)
 * Sint Maarten (No DST)
 * Trinidad and Tobago (No DST)
 * United States Virgin Islands (No DST)