Daylight saving time
Every clock change in the coming year, by date, and the countries that never change.
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
Wednesday, November 4, 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.
Countries and cities on AST
Where Atlantic Time is kept, with each country's largest cities in the zone.
| City | Local time | Compared to AST |
|---|---|---|
| Dominican RepublicSanto Domingo, Santiago de los Caballeros, Santo Domingo Oeste | Wed 3:11 PM | Same time |
| Puerto RicoSan Juan, Bayamón, Carolina | Wed 3:11 PM | Same time |
| CanadaHalifax, Sydney, Dartmouth | Wed 3:11 PM | Same time |
| Trinidad and TobagoChaguanas, Mon Repos, San Fernando | Wed 3:11 PM | Same time |
| MartiniqueFort-de-France, Le Lamentin, Le Robert | Wed 3:11 PM | Same time |
| CuracaoWillemstad, Bandariba | Wed 3:11 PM | Same time |
| GuadeloupeLes Abymes, Baie-Mahault, Le Gosier | Wed 3:11 PM | Same time |
| BarbadosBridgetown | Wed 3:11 PM | Same time |
| ArubaOranjestad, Noord, Tanki Leendert | Wed 3:11 PM | Same time |
| U.S. Virgin IslandsSaint Croix, Charlotte Amalie | Wed 3:11 PM | Same time |
| Antigua and BarbudaSaint John’s | Wed 3:11 PM | Same time |
| Saint Vincent and the GrenadinesKingstown, Calliaqua | Wed 3:11 PM | Same time |
| Saint LuciaGros Islet, Castries | Wed 3:11 PM | Same time |
| DominicaRoseau | Wed 3:11 PM | Same time |
| Saint Kitts and NevisBasseterre | Wed 3:11 PM | Same time |
| Bonaire, Saint Eustatius and Saba Kralendijk | Wed 3:11 PM | Same time |
| British Virgin IslandsRoad Town | Wed 3:11 PM | Same time |
| GrenadaSaint George's | Wed 3:11 PM | Same time |
| Saint BarthelemyGustavia | Wed 3:11 PM | Same time |
| Saint MartinMarigot | Wed 3:11 PM | Same time |
| AnguillaThe Valley | Wed 3:11 PM | Same time |
| Sint MaartenPhilipsburg | Wed 3:11 PM | Same time |
| MontserratBrades, Plymouth | Wed 3:11 PM | Same time |
| BermudaHamilton | Wed 3:11 PM | Same time |
More free tools
Frequently asked questions
Ask a questionThe clock at the top of this page shows the current time in Atlantic Time (AST, or ADT in summer), following the rules of the America/Halifax time zone. It is UTC−4 at the moment.
AST stands for Atlantic Time. It is used in Atlantic Canada & the Caribbean.
AST is UTC−4. During daylight saving time the same places are on ADT, UTC−3.
AST is the standard time; in summer the zone is on ADT, UTC−3. Clocks go forward 1 hour on Sun, Mar 14, 2027.
Other time zones
- UTCThe world's reference time
- GMTUTC+0 all year
- EST/EDTUS & Canada
- CST/CDTUS
- MST/MDTUS & Canada
- PST/PDTUS & Canada
- AKST/AKDTAlaska
- HSTHawaii
- NST/NDTNewfoundland
- GMT/BSTUnited Kingdom
- WET/WESTPortugal & the Canary Islands
- CET/CESTBerlin
- EET/EESTAthens
- MSKMoscow
- TRTTürkiye
- EATNairobi
- CATMaputo
- SASTSouth Africa
- WATLagos
- ASTSaudi Arabia
- GSTUAE & Oman
- IRSTIran
- PKTPakistan
- ISTIndia
- IST/IDTIsrael
- GMT/ISTIreland
- NPTNepal
- BSTBangladesh
- ICTThailand
- WIBJakarta
- CSTChina
- HKTHong Kong
- SGTSingapore
- MYTMalaysia
- PHTPhilippines
- AWSTPerth
- JSTJapan
- KSTSouth Korea
- ACST/ACDTAdelaide
- AEST/AEDTSydney
- NZST/NZDTNew Zealand
- BRTSão Paulo
- ARTArgentina
- CST/CDTCuba
- SSTAmerican Samoa
- AoEUTC−12 all year
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.