Hawaii Time to Australian Central Time
Convert times between Hawaii Time (HST, UTC-10:00) and Australian Central Time (ACST, UTC+9:30). Australian Central Time is 19.5 hours ahead of Hawaii Time in standard time. During daylight saving time this difference changes to 20.5 hours.
UTC-10:00→UTC+9:30 / +10:30
Live timezone converterUTC Offset Reference
| Timezone | Abbreviation | Standard offset | DST offset | Country |
|---|---|---|---|---|
| Hawaii Time | HST | UTC-10:00 | — | United States |
| Australian Central Time | ACST / ACDT | UTC+9:30 | UTC+10:30 | Australia |
* DST offset applies during summer months. Exact transition dates vary by year.
Standard Time Conversion (HST → ACST)
| Hawaii Time | Australian Central Time |
|---|---|
| 12:00 AM HST | 7.5:00 PM ACST |
| 6:00 AM HST | 1.5:00 AM (next day) ACST |
| 9:00 AM HST | 4.5:00 AM (next day) ACST |
| 12:00 PM HST | 7.5:00 AM (next day) ACST |
| 3:00 PM HST | 10.5:00 AM (next day) ACST |
| 6:00 PM HST | 1.5:00 PM (next day) ACST |
| 9:00 PM HST | 4.5:00 PM (next day) ACST |
Summer (DST) Conversion (HST → ACDT)
| Hawaii Time (summer) | Australian Central Time (summer) |
|---|---|
| 12:00 AM HST | 8.5:00 PM ACDT |
| 6:00 AM HST | 2.5:00 AM (next day) ACDT |
| 9:00 AM HST | 5.5:00 AM (next day) ACDT |
| 12:00 PM HST | 8.5:00 AM (next day) ACDT |
| 3:00 PM HST | 11.5:00 AM (next day) ACDT |
| 6:00 PM HST | 2.5:00 PM (next day) ACDT |
| 9:00 PM HST | 5.5:00 PM (next day) ACDT |
Daylight Saving Time (DST) Notes
- Australian Central Time observes DST. Clocks advance 1 hour to ACDT (UTC+10:30) roughly from month 10 to 4.
- The offset difference shifts between 19.5h (standard) and 20.5h (DST season). Always verify the current offset using the live converter below.
Frequently Asked Questions
How do I convert HST to ACST?
Add 19.5 hours to the HST time to get ACST. For example, 9:00 AM HST = 4.5:00 AM ACST.
What is the current UTC offset for Hawaii Time?
Hawaii Time is always UTC-10:00 (HST) — it does not observe DST.
Is Australian Central Time ahead or behind Hawaii Time?
Australian Central Time is 19.5 hours ahead of Hawaii Time in standard time.
When is a good time to schedule a meeting between HST and ACST?
Due to the 19.5-hour difference, business-hours overlap may be limited. Use the live timezone converter to find a mutually convenient time.
Related Timezone Conversions
Hawaii Time → US Eastern TimeHST / ESTHawaii Time → US Central TimeHST / CSTHawaii Time → US Mountain TimeHST / MSTHawaii Time → US Pacific TimeHST / PSTHawaii Time → US Alaska TimeHST / AKSTHawaii Time → Canada Atlantic TimeHST / ASTHawaii Time → Australian Eastern TimeHST / AESTHawaii Time → Australian Western TimeHST / AWST
Need the exact current time?
Use the live ToolsHub timezone converter to see current times, DST status, and schedule across time zones.