What is HST in AST?
Atlantic Time is 7 hours ahead
Hawaii Standard Time is on UTC−10:00 and Atlantic Time is on UTC−3:00 right now. Atlantic Time is on daylight saving, so its clocks read ADT. The gap changes during the year — see below.
- Time in Honolulu
- 4:56 pm
- Time in Halifax
- 11:56 pm
- Difference
- +7 h
- Next clock change
- November 1, 2026
Convert a time
ADT — Atlantic Time
11:00 pm
Tue
When the difference changes
Hawaii Standard Time and Atlantic Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:
- Now – November 1, 2026Atlantic Time is 7 hours ahead
- November 1, 2026 – March 14, 2027Atlantic Time is 6 hours ahead
- March 14, 2027 – onwardsAtlantic Time is 7 hours ahead
Periods shorter than a day are not listed: both zones change at 2am in their own local time, so there are a few hours on each transition date when the gap is briefly something else.
Daylight saving
Hawaii Standard Time
Hawaii Standard Time stays on HST all year, so its offset from UTC never moves.
Atlantic Time
Clocks go back one hour at 2am local time, becoming AST.
HST to AST conversion table
Every hour of Tuesday, September 22, 2026, converted from Hawaii Standard Time to Atlantic Time. 7 of the 24 hours fall on a different calendar day in Halifax, which is marked.
- 12:00 am HST
- 7:00 am ADT
- 1:00 am HST
- 8:00 am ADT
- 2:00 am HST
- 9:00 am ADT
- 3:00 am HST
- 10:00 am ADT
- 4:00 am HST
- 11:00 am ADT
- 5:00 am HST
- 12:00 pm ADT
- 6:00 am HST
- 1:00 pm ADT
- 7:00 am HST
- 2:00 pm ADT
- 8:00 am HST
- 3:00 pm ADT
- 9:00 am HST
- 4:00 pm ADT
- 10:00 am HST
- 5:00 pm ADT
- 11:00 am HST
- 6:00 pm ADT
- 12:00 pm HST
- 7:00 pm ADT
- 1:00 pm HST
- 8:00 pm ADT
- 2:00 pm HST
- 9:00 pm ADT
- 3:00 pm HST
- 10:00 pm ADT
- 4:00 pm HST
- 11:00 pm ADT
- 5:00 pm HST
- 12:00 am ADT+1 day
- 6:00 pm HST
- 1:00 am ADT+1 day
- 7:00 pm HST
- 2:00 am ADT+1 day
- 8:00 pm HST
- 3:00 am ADT+1 day
- 9:00 pm HST
- 4:00 am ADT+1 day
- 10:00 pm HST
- 5:00 am ADT+1 day
- 11:00 pm HST
- 6:00 am ADT+1 day
Scheduling between the two
Working hours overlap from 9:00 am to 11:00 am HST, which is 4:00 pm to 6:00 pm ADT. Anything inside that window falls in the normal working day at both ends.
A note on AST: it can also mean Arabia Standard Time (UTC+3). This page means Atlantic Time.
Hawaii Standard Time (HST) is used in all of Hawaii, which does not observe daylight saving
Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico