AST/ADT: Atlantic Time

Atlantic Time, UTC−4 right now. Used in Atlantic Canada & the Caribbean. Clocks go forward 1 hour on Sun, Mar 14, 2027.

AST, Atlantic Time

AST

Friday, November 6, 2026

UTC−4

Abbreviation
AST/ADT
Full name
Atlantic Time
UTC offset now
UTC−4
Standard time
UTC−4
Daylight time
UTC−3
Daylight saving
Yes
Reference zone
America/Halifax
Where
Atlantic Canada & the Caribbean

Daylight saving time in AST

  • DST ended

    Sun, Nov 1, 2026

    Clocks went back 1 hour

  • DST starts

    Sun, Mar 14, 2027

    Clocks go forward 1 hour

  • Winter

    UTC−4

    AST

  • Summer

    UTC−3

    ADT

AST is the standard time; in summer the zone is on ADT, UTC−3. Clocks go forward 1 hour on Sun, Mar 14, 2027.

Convert AST to another time zonePlan a meeting in AST

Countries and cities on AST

Where Atlantic Time is kept, with each country's largest cities in the zone.

Countries using AST
CityLocal timeCompared to AST
Dominican RepublicSanto Domingo, Santiago de los Caballeros, Santo Domingo OesteFri 5:52 AMSame time
Puerto RicoSan Juan, Bayamón, CarolinaFri 5:52 AMSame time
CanadaHalifax, Sydney, DartmouthFri 5:52 AMSame time
Trinidad and TobagoChaguanas, Mon Repos, San FernandoFri 5:52 AMSame time
MartiniqueFort-de-France, Le Lamentin, Le RobertFri 5:52 AMSame time
CuracaoWillemstad, BandaribaFri 5:52 AMSame time
GuadeloupeLes Abymes, Baie-Mahault, Le GosierFri 5:52 AMSame time
BarbadosBridgetownFri 5:52 AMSame time
ArubaOranjestad, Noord, Tanki LeendertFri 5:52 AMSame time
U.S. Virgin IslandsSaint Croix, Charlotte AmalieFri 5:52 AMSame time
Antigua and BarbudaSaint John’sFri 5:52 AMSame time
Saint Vincent and the GrenadinesKingstown, CalliaquaFri 5:52 AMSame time
Saint LuciaGros Islet, CastriesFri 5:52 AMSame time
DominicaRoseauFri 5:52 AMSame time
Saint Kitts and NevisBasseterreFri 5:52 AMSame time
Bonaire, Saint Eustatius and Saba KralendijkFri 5:52 AMSame time
British Virgin IslandsRoad TownFri 5:52 AMSame time
GrenadaSaint George'sFri 5:52 AMSame time
Saint BarthelemyGustaviaFri 5:52 AMSame time
Saint MartinMarigotFri 5:52 AMSame time
AnguillaThe ValleyFri 5:52 AMSame time
Sint MaartenPhilipsburgFri 5:52 AMSame time
MontserratBrades, PlymouthFri 5:52 AMSame time
BermudaHamiltonFri 5:52 AMSame time

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Place data from GeoNames (CC BY 4.0). Times follow the IANA time zone database; sunrise and sunset are computed for the city's coordinates.