Current Time in ADT (Atlantic Daylight Time)
About ADT
The daylight saving time observed in the Atlantic Time Zone of North America. It is used by parts of eastern Canada (Nova Scotia, New Brunswick, Prince Edward Island) and some Caribbean islands during their summer months. It is one hour ahead of Atlantic Standard Time (AST).
UTC Offset: -03:00
Current time shown is based on the representative IANA zone: America/Halifax
Atlantic Daylight Time: A Comprehensive Guide
Atlantic Daylight Time (ADT) is a daylight saving time zone used in parts of eastern Canada, Bermuda, and Greenland. It is three hours behind Coordinated Universal Time (UTC-3) and is observed during the summer months. This article covers the zone's definition, regions, differences from neighboring zones, and practical information for business and travel.
What Is Atlantic Daylight Time?
Atlantic Daylight Time (ADT) is the daylight saving time variant of Atlantic Standard Time (AST). The abbreviation ADT stands for Atlantic Daylight Time. It is used from the second Sunday in March to the first Sunday in November, when clocks are set one hour ahead of AST (UTC-4). During the rest of the year, the region observes AST (UTC-4).
Regions and Cities
ADT is observed in the following IANA time zones: America/Glace_Bay, America/Goose_Bay, America/Halifax, America/Moncton, America/Thule, Atlantic/Bermuda, and Canada/Atlantic. These cover:
- Canada: Most of Nova Scotia (including Halifax), New Brunswick (including Moncton), Prince Edward Island, and parts of Newfoundland and Labrador (including Goose Bay and Glace Bay).
- Greenland: The Thule Air Base area (America/Thule).
- Bermuda: The entire territory (Atlantic/Bermuda).
Major cities in ADT include Halifax, Moncton, Saint John (New Brunswick), Charlottetown, and Hamilton (Bermuda).
Standard Offset and Daylight-Saving Counterpart
ADT has a standard UTC offset of UTC-3. Its daylight-saving counterpart is Atlantic Standard Time (AST), which is UTC-4. During daylight saving time (March to November), clocks are set to UTC-3 (ADT). During standard time (November to March), clocks are set to UTC-4 (AST).
How It Differs from Neighboring Zones
- Eastern Daylight Time (EDT, UTC-4): ADT is one hour ahead of EDT. For example, when it is 12:00 PM in Halifax (ADT), it is 11:00 AM in New York (EDT).
- Newfoundland Daylight Time (NDT, UTC-2:30): NDT is 30 minutes ahead of ADT. St. John's (NDT) is 30 minutes later than Halifax (ADT).
- Greenland Daylight Time (GMT-2): Most of Greenland uses GMT-2 (Western Greenland Time), which is one hour ahead of ADT. Thule Air Base uses ADT, so it is one hour behind the rest of Greenland during daylight saving time.
- Bermuda: Bermuda uses ADT, aligning with Canada's Atlantic region, not with US Eastern Time.
Practical Business-Hours Guidance
When scheduling calls or meetings across ADT and neighboring zones, keep these tips in mind:
- With Eastern Time (EDT): ADT is one hour ahead. A 9:00 AM meeting in Halifax is 8:00 AM in New York. Plan accordingly for early or late hours.
- With Newfoundland (NDT): ADT is 30 minutes behind. A 10:00 AM call in Halifax means a 10:30 AM start in St. John's.
- With the United Kingdom (BST, UTC+1): ADT is 4 hours behind BST. When it is 9:00 AM in Halifax, it is 1:00 PM in London.
- With Bermuda: Same time as Halifax, so no adjustment needed.
- With Thule, Greenland: Same time as Halifax, but note that Thule uses ADT only during daylight saving time; the rest of Greenland uses different offsets.
During standard time (AST, UTC-4), the differences remain similar but with a one-hour shift relative to UTC. Always confirm if daylight saving time is in effect for both locations.
Frequently Asked Questions
What does ADT stand for?
What is the UTC offset of ADT?
ADT is UTC-3, meaning it is three hours behind Coordinated Universal Time.
Which Canadian provinces use ADT?
ADT is observed in Nova Scotia, New Brunswick, Prince Edward Island, and parts of Newfoundland and Labrador (such as Goose Bay and Glace Bay).
Does Bermuda use ADT?
Yes, Bermuda uses Atlantic Daylight Time (ADT) during daylight saving time and Atlantic Standard Time (AST) during the rest of the year.
How is ADT different from Eastern Daylight Time?
ADT is one hour ahead of Eastern Daylight Time (EDT). For example, when it is 12:00 PM in Halifax (ADT), it is 11:00 AM in New York (EDT).
When does ADT start and end?
ADT begins on the second Sunday of March (clocks spring forward from AST to ADT) and ends on the first Sunday of November (clocks fall back to AST).