Offset
The time difference between Hawaii Time and Atlantic Time is 7 hours.
Hawaii Time (HST) is behind Atlantic Time (ADT).
HST: UTC-10
ADT: UTC-3
Atlantic Time is currently observing daylight saving time; Hawaii Time is not.
When to schedule
Business-hours overlap: 9 AM–10 AM in Hawaii Time (4 PM–5 PM in Atlantic Time).
Both teams are in working hours during this window on weekdays.
Suggested time: 9:00 AM Hawaii Time (4:00 PM Atlantic Time).
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
United States
- New Year's DayThu, Jan 1
- Martin Luther King, Jr. DayMon, Jan 19
- Presidents DayMon, Feb 16
- Memorial DayMon, May 25
- Juneteenth National Independence DayFri, Jun 19
- Independence DayFri, Jul 3
- Labour DayMon, Sep 7
- Columbus DayMon, Oct 12
- Veterans DayWed, Nov 11
- Thanksgiving DayThu, Nov 26
- Christmas DayFri, Dec 25
Canada
- New Year's DayThu, Jan 1
- Good FridayFri, Apr 3
- Victoria DayMon, May 18
- Canada DayWed, Jul 1
- Labour DayMon, Sep 7
- National Day for Truth and ReconciliationWed, Sep 30
- ThanksgivingMon, Oct 12
- Christmas DayFri, Dec 25
About these zones
Hawaii Time is also known as HST. To call United States, dial +1.
Atlantic Time is also known as AST, or ADT. To call Canada, dial +1.
Atlantic Time is approximately 5,400 miles northeast of Hawaii Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| HST | AST-ATLANTIC | Day |
|---|---|---|
| 12:00 am | 7:00 am | Same day |
| 1:00 am | 8:00 am | Same day |
| 2:00 am | 9:00 am | Same day |
| 3:00 am | 10:00 am | Same day |
| 4:00 am | 11:00 am | Same day |
| 5:00 am | 12:00 pm | Same day |
| 6:00 am | 1:00 pm | Same day |
| 7:00 am | 2:00 pm | Same day |
| 8:00 am | 3:00 pm | Same day |
| 9:00 am | 4:00 pm | Same day |
| 10:00 am | 5:00 pm | Same day |
| 11:00 am | 6:00 pm | Same day |
| 12:00 pm | 7:00 pm | Same day |
| 1:00 pm | 8:00 pm | Same day |
| 2:00 pm | 9:00 pm | Same day |
| 3:00 pm | 10:00 pm | Same day |
| 4:00 pm | 11:00 pm | Same day |
| 5:00 pm | 12:00 am | +1 day |
| 6:00 pm | 1:00 am | +1 day |
| 7:00 pm | 2:00 am | +1 day |
| 8:00 pm | 3:00 am | +1 day |
| 9:00 pm | 4:00 am | +1 day |
| 10:00 pm | 5:00 am | +1 day |
| 11:00 pm | 6:00 am | +1 day |
Daylight saving time
Atlantic Time observes daylight saving time; Hawaii Time does not. The offset between the two zones changes when Atlantic Time transitions: on Sunday, November 1, 2026, clocks fall back from ADT to AST.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:50 AM
- Sunset
- 7:12 PM
- Day length
- 13h 22m
- Sunrise
- 5:31 AM
- Sunset
- 8:56 PM
- Day length
- 15h 25m
Cities in these zones
Cities in Hawaii Time
Cities in Atlantic Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Hawaii Time
- HNL
Airports in Atlantic Time
- YHZ
Related conversions
Common conversions
- What is 9:00 am HST in AST-ATLANTIC?
- 9:00 am HST is 4:00 pm AST-ATLANTIC.
- What is 12:00 pm HST in AST-ATLANTIC?
- 12:00 pm HST is 7:00 pm AST-ATLANTIC.
- What is 12:30 pm HST in AST-ATLANTIC?
- 12:30 pm HST is 7:30 pm AST-ATLANTIC.
- What is 2:00 pm HST in AST-ATLANTIC?
- 2:00 pm HST is 9:00 pm AST-ATLANTIC.
- What is 5:00 pm HST in AST-ATLANTIC?
- 5:00 pm HST is 12:00 am AST-ATLANTIC, the next day.
- What is 11:30 pm HST in AST-ATLANTIC?
- 11:30 pm HST is 6:30 am AST-ATLANTIC, the next day.