Atlantic Daylight Time (ADT)
ADT is UTC-3. Current Atlantic Time (Canada) and when ADT applies.
Atlantic Time (Canada) now
--:--:--
Saturday, September 19, 2026
ADTUTC-3
Atlantic Time is on ADT right now
Exact ADT (UTC-3) time now: --:--:--
About ADT
- Full Name
- Atlantic Daylight Time
- Abbreviation
- ADT
- UTC Offset
- UTC-3
- Atlantic Time is on
- Daylight Time (ADT)
- Daylight Saving Time
- Atlantic Time: Ends Nov 1, 2026 · switches between AST and ADT
Atlantic Daylight Time (ADT) is UTC-3, the daylight saving time used in Atlantic Canada and Bermuda from the second Sunday in March to the first Sunday in November. The rest of the year those places use Atlantic Standard Time (AST, UTC-4).
Where ADT is used
Switches between AST and ADT
- Nova Scotia, New Brunswick and Prince Edward Island, Canada (Halifax, Moncton)
- Bermuda
Major Cities in Atlantic Time
Each city shows its own current abbreviation, so places on daylight saving time are labelled accordingly.
ADT vs Other Time Zones
| Comparison | By definition | Right now (local clocks) |
|---|---|---|
| ADT to AST | -1 hour | Same region |
| ADT to EDT | -1 hour | -1 hour |
| ADT to NDT | +30 minutes | +30 minutes |
| ADT to UTC | +3 hours | +3 hours |
“By definition” compares the fixed offsets of the abbreviations. “Right now” compares the actual local time in each region today, including daylight saving time.
ADT FAQs
What is ADT?
Atlantic Daylight Time (ADT) is UTC-3, the daylight saving time used in Atlantic Canada and Bermuda from the second Sunday in March to the first Sunday in November. The rest of the year those places use Atlantic Standard Time (AST, UTC-4).
What is the UTC offset of ADT?
ADT is always UTC-3. When Atlantic Time is not on daylight saving time, it uses AST (UTC-4) instead.
Is it ADT or AST right now?
Atlantic Time is on ADT right now. ADT is UTC-3. Atlantic Time switches to AST (UTC-4) on Sunday, November 1, 2026 at 2:00 AM.
When does Atlantic Time switch between AST and ADT?
In 2026, Atlantic Time switches to ADT on Sunday, March 8, 2026 at 2:00 AM (clocks go forward 1 hour) and back on Sunday, November 1, 2026 at 2:00 AM (clocks go back 1 hour).
Is ADT used all year anywhere?
No major region uses ADT all year. It is only in effect during daylight saving time; the rest of the year the same places use AST.