HST to ACST Converter
Hawaii to central Australia — a 19.5-hour gap with seasonal variation due to daylight saving. Coordination typically centers on trade, investment, and remote team management.
Time Zone Converter
Compare Times
| HST | ACST |
|---|---|
| 8:00 AM HST | 3:30 AM ACST |
| 9:00 AM HST | 4:30 AM ACST |
| 10:00 AM HST | 5:30 AM ACST |
| 11:00 AM HST | 6:30 AM ACST |
| 12:00 PM HST | 7:30 AM ACST |
| 1:00 PM HST | 8:30 AM ACST |
| 2:00 PM HST | 9:30 AM ACST |
| 3:00 PM HST | 10:30 AM ACST |
| 4:00 PM HST | 11:30 AM ACST |
| 5:00 PM HST | 12:30 PM ACST |
| 6:00 PM HST | 1:30 PM ACST |
| 7:00 PM HST | 2:30 PM ACST |
| 8:00 PM HST | 3:30 PM ACST |
Common Time Conversions
EST · New York →
CST · Chicago →
MST · Denver →
PST · Los Angeles →
AKST · Anchorage →
HST · Honolulu →
UTC · Universal →
GMT · London →
IST · New Delhi →
CET · Paris →
How Time Zone Conversion Works
Time zone conversion works by comparing the UTC offset of one location to another. Every city or region is measured relative to Coordinated Universal Time (UTC), which acts as the global reference point for civil time.
ACST is 19 hours 30 minutes ahead of HST (standard time).
Daylight Saving Time: ACST observes DST; HST does not. The offset between them shifts by 1 hour twice a year — in spring and autumn — when ACST changes its clocks.
Best Meeting Times: HST & ACST
HST
07:00–08:00
Hawaii Time
ACST
02:30–03:30
Central Australia Time
Recommended time: 07:00 HST / 02:30 ACST
DST schedule for 2026
Current-year daylight saving start and end dates for the selected zones.
HST · Hawaii Time
Standard offset −10:00
Hawaii Time remains on a constant standard offset for the year.
Hawaii does not observe DST. The Aleutian Islands portion of HAST does observe DST (becoming HADT, UTC−9), but population there is negligible. For practical purposes HST is a fixed-offset zone.
ACST · Central Australia Time
Standard offset +09:30
- Starts
- Oct 4, 2026 · 02:00 → 03:00
- first_sunday_of_october
- Ends
- Apr 5, 2026 · 03:00 → 02:00
- first_sunday_of_april
- Daylight time
- ACDT · +10:30
South Australia observes DST (ACDT, UTC+10:30); the Northern Territory remains on ACST year-round. SA has used the same Sunday transition dates as the eastern states since the 2008/09 DST season — older sources stating SA changes one week later are out of date.
Principal Cities
HST — Hawaii Time
- HonoluluUnited States
- Pearl CityUnited States
- HiloUnited States
- KailuaUnited States
ACST — Central Australia Time
- AdelaideAustralia
- DarwinAustralia
- Alice SpringsAustralia
- PalmerstonAustralia