HST to AEST Converter
AEDT is 21 hours ahead of HST. 9:00 AM HST = 6:00 AM AEDT (next day).
AEDT is 21 hours ahead of HST at the moment. To convert HST to AEST, add 21 hours to the HST time: 9:00 AM HST = 6:00 AM AEDT (next day).
HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time). AEST (Australian Eastern Time) is used in New South Wales, Victoria, Tasmania, ACT; Queensland (Brisbane) all year.
Queensland stays on AEST all year. AEST (Australian Eastern Standard Time) is not in force right now: New South Wales is currently on AEDT. This page uses whichever name applies on the date you pick, so the numbers below say AEDT.
HST to AEST time conversion table
HST to AEST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| HST | AEST | Day |
|---|---|---|
| 12:00 AM HST | 9:00 PM AEDT | — |
| 1:00 AM HST | 10:00 PM AEDT | night |
| 2:00 AM HST | 11:00 PM AEDT | night |
| 3:00 AM HST | 12:00 AM AEDT | next day |
| 4:00 AM HST | 1:00 AM AEDT | next day |
| 5:00 AM HST | 2:00 AM AEDT | next day |
| 6:00 AM HST | 3:00 AM AEDT | next day |
| 7:00 AM HST | 4:00 AM AEDT | next day |
| 8:00 AM HST | 5:00 AM AEDT | next day |
| 9:00 AM HST | 6:00 AM AEDT | next day |
| 10:00 AM HST | 7:00 AM AEDT | next day |
| 11:00 AM HST | 8:00 AM AEDT | next day |
| 12:00 PM HST | 9:00 AM AEDT | work hours |
| 1:00 PM HST | 10:00 AM AEDT | work hours |
| 2:00 PM HST | 11:00 AM AEDT | work hours |
| 3:00 PM HST | 12:00 PM AEDT | work hours |
| 4:00 PM HST | 1:00 PM AEDT | work hours |
| 5:00 PM HST | 2:00 PM AEDT | next day |
| 6:00 PM HST | 3:00 PM AEDT | next day |
| 7:00 PM HST | 4:00 PM AEDT | next day |
| 8:00 PM HST | 5:00 PM AEDT | next day |
| 9:00 PM HST | 6:00 PM AEDT | next day |
| 10:00 PM HST | 7:00 PM AEDT | next day |
| 11:00 PM HST | 8:00 PM AEDT | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert HST to AEST
Add 21 hours to the HST time to get AEST.
Example: 9:00 AM HST = 6:00 AM AEDT (next day).
Across midnight: 10:00 PM HST = 7:00 PM AEDT (next day). The date changes, so always check the day as well as the hour.
Time difference between HST and AEST
The time difference between HST and AEST 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 – 3 Apr 2026: AEST is 21 hours ahead of HST.
- 4 Apr 2026 – 2 Oct 2026: AEST is 20 hours ahead of HST.
- 3 Oct 2026 – 30 Dec 2026: AEST is 21 hours ahead of HST.
HST and AEST during daylight saving time
- HST does not observe daylight saving time; it stays on UTC−10 all year.
- AEST next changes on 4 Apr 2027: clocks go back one hour at 02:59 local time, from AEDT (UTC+11) to AEST (UTC+10).
Best time for a meeting between HST and AEST
HST and AEST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 10:00 AM HST, which is 7:00 AM AEDT.
HST to AEST FAQ
What is the time difference between HST and AEST?
Right now AEDT is 21 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 AEST?
9:00 AM HST is 6:00 AM AEDT (next day).
What is 12 PM (noon) HST in AEST?
12:00 PM HST is 9:00 AM AEDT (next day).
Is AEST ahead of or behind HST?
AEDT is 21 hours ahead of HST, so it is later in AEST 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 AEST change for daylight saving time?
Yes. AEST next changes on 4 Apr 2027, when clocks go back one hour from AEDT to AEST.
What is the best time for a meeting between HST and AEST?
HST and AEST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 10:00 AM HST, which is 7:00 AM AEDT.
Related conversions
Convert AEST to HST
Convert HST to other time zones
Convert other time zones to AEST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.