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