ACST: Australian Central Time
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ACST to HST: convert Australian Central Time to Hawaii Standard Time
In January, HST is 20:30 hours behind ACST. In July it is 19:30 hours behind. The gap moves because the two regions handle daylight saving differently.
One instant, two local clocks
Drag one day across both zones
Shared instant12:00 UTC
Difference nowHST is 20:30 hours behind
ACSTAustralian Central Time
22:30Thu, Jan 15
HSTHawaii Standard Time
02:00Thu, Jan 15
Approximate daylight 09:00 to 17:00 Selected local time
Both lanes show the same instant. Local dates, daylight, and offsets come from each IANA zone on the selected date, so daylight saving changes are included.
Right now
HST: Hawaii Standard Time
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Local times come from your browser's IANA time zone data.
ACST to HST hour by hour
Two columns because the gap changes with daylight saving: use the January column roughly November to mid-March, the July column mid-March to October. Exact switch dates vary by year.
| ACST | HST (January) | HST (July) |
|---|---|---|
| 12:00 AM | 3:30 AM (prev day) | 4:30 AM (prev day) |
| 1:00 AM | 4:30 AM (prev day) | 5:30 AM (prev day) |
| 2:00 AM | 5:30 AM (prev day) | 6:30 AM (prev day) |
| 3:00 AM | 6:30 AM (prev day) | 7:30 AM (prev day) |
| 4:00 AM | 7:30 AM (prev day) | 8:30 AM (prev day) |
| 5:00 AM | 8:30 AM (prev day) | 9:30 AM (prev day) |
| 6:00 AM | 9:30 AM (prev day) | 10:30 AM (prev day) |
| 7:00 AM | 10:30 AM (prev day) | 11:30 AM (prev day) |
| 8:00 AM | 11:30 AM (prev day) | 12:30 PM (prev day) |
| 9:00 AM | 12:30 PM (prev day) | 1:30 PM (prev day) |
| 10:00 AM | 1:30 PM (prev day) | 2:30 PM (prev day) |
| 11:00 AM | 2:30 PM (prev day) | 3:30 PM (prev day) |
| 12:00 PM | 3:30 PM (prev day) | 4:30 PM (prev day) |
| 1:00 PM | 4:30 PM (prev day) | 5:30 PM (prev day) |
| 2:00 PM | 5:30 PM (prev day) | 6:30 PM (prev day) |
| 3:00 PM | 6:30 PM (prev day) | 7:30 PM (prev day) |
| 4:00 PM | 7:30 PM (prev day) | 8:30 PM (prev day) |
| 5:00 PM | 8:30 PM (prev day) | 9:30 PM (prev day) |
| 6:00 PM | 9:30 PM (prev day) | 10:30 PM (prev day) |
| 7:00 PM | 10:30 PM (prev day) | 11:30 PM (prev day) |
| 8:00 PM | 11:30 PM (prev day) | 12:30 AM |
| 9:00 PM | 12:30 AM | 1:30 AM |
| 10:00 PM | 1:30 AM | 2:30 AM |
| 11:00 PM | 2:30 AM | 3:30 AM |
Scheduling a call between ACST and HST
Standard business hours (9:00 AM to 5:00 PM) do not overlap in January: daytime in Australian Central Time falls outside the working day in Hawaii Standard Time, so one side needs an early morning or late evening.
In July standard business hours do not overlap at all.
More ACST conversions
Offsets are computed from the IANA time zone database for January 15 and July 15 of the current year. ACST here means Australian Central Time (central Australia); HST means Hawaii Standard Time (Hawaii, United States).