AST to HST Converter
HST is 6 hours behind AST. 9:00 AM AST = 3:00 AM HST.
HST is 6 hours behind AST at the moment. To convert AST to HST, subtract 6 hours from the AST time: 9:00 AM AST = 3:00 AM HST.
AST (Atlantic Time) is used in Nova Scotia, New Brunswick, PEI; Puerto Rico and the Eastern Caribbean (all year). HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time).
AST here is Atlantic Standard Time, not Arabia Standard Time.
AST to HST time conversion table
AST to HST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| AST | HST | Day |
|---|---|---|
| 12:00 AM AST | 6:00 PM HST | previous day |
| 1:00 AM AST | 7:00 PM HST | previous day |
| 2:00 AM AST | 8:00 PM HST | previous day |
| 3:00 AM AST | 9:00 PM HST | previous day |
| 4:00 AM AST | 10:00 PM HST | previous day |
| 5:00 AM AST | 11:00 PM HST | previous day |
| 6:00 AM AST | 12:00 AM HST | night |
| 7:00 AM AST | 1:00 AM HST | night |
| 8:00 AM AST | 2:00 AM HST | night |
| 9:00 AM AST | 3:00 AM HST | night |
| 10:00 AM AST | 4:00 AM HST | night |
| 11:00 AM AST | 5:00 AM HST | night |
| 12:00 PM AST | 6:00 AM HST | — |
| 1:00 PM AST | 7:00 AM HST | — |
| 2:00 PM AST | 8:00 AM HST | — |
| 3:00 PM AST | 9:00 AM HST | work hours |
| 4:00 PM AST | 10:00 AM HST | work hours |
| 5:00 PM AST | 11:00 AM HST | — |
| 6:00 PM AST | 12:00 PM HST | — |
| 7:00 PM AST | 1:00 PM HST | — |
| 8:00 PM AST | 2:00 PM HST | — |
| 9:00 PM AST | 3:00 PM HST | — |
| 10:00 PM AST | 4:00 PM HST | — |
| 11:00 PM AST | 5:00 PM HST | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert AST to HST
Subtract 6 hours from the AST time to get HST.
Example: 9:00 AM AST = 3:00 AM HST.
Across midnight: 1:00 AM AST = 7:00 PM HST (previous day). The date changes, so always check the day as well as the hour.
Time difference between AST and HST
The time difference between AST and HST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 31 Dec 2025 – 7 Mar 2026: HST is 6 hours behind of AST.
- 8 Mar 2026 – 31 Oct 2026: HST is 7 hours behind of AST.
- 1 Nov 2026 – 30 Dec 2026: HST is 6 hours behind of AST.
AST and HST during daylight saving time
- AST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from AST (UTC−4) to ADT (UTC−3).
- HST does not observe daylight saving time; it stays on UTC−10 all year.
Best time for a meeting between AST and HST
AST and HST share 2 hours of the 9 AM–5 PM working day. Any time between 3:00 PM and 5:00 PM AST lands between 9:00 AM and 11:00 AM HST, inside working hours for both.
AST to HST FAQ
What is the time difference between AST and HST?
Right now HST is 6 hours behind AST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM AST in HST?
9:00 AM AST is 3:00 AM HST.
What is 12 PM (noon) AST in HST?
12:00 PM AST is 6:00 AM HST.
Is HST ahead of or behind AST?
HST is 6 hours behind AST, so it is earlier in HST than in AST.
Does AST change for daylight saving time?
Yes. AST next changes on 14 Mar 2027, when clocks go forward one hour from AST to ADT.
Does HST change for daylight saving time?
No. HST stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between AST and HST?
AST and HST share 2 hours of the 9 AM–5 PM working day. Any time between 3:00 PM and 5:00 PM AST lands between 9:00 AM and 11:00 AM HST, inside working hours for both.
Related conversions
Convert HST to AST
Convert AST to other time zones
Convert other time zones to HST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.