HST to ACST Time Converter
ACST is 20 hours 30 minutes ahead of HST right now. 9:00 AM in HST is 5:30 AM in ACST (next day).
Time now: HST and ACST
ACST is 20 hours 30 minutes ahead of HST right now. The gap is not fixed: it is 19 hours 30 minutes at some times of the year and 20 hours 30 minutes at others, because at least one of them changes its clocks for daylight saving time.
HST to ACST conversion table
Every hour of the day, using today's time difference.
| HST | ACST |
|---|---|
| 12:00 AM | 8:30 PM |
| 1:00 AM | 9:30 PM |
| 2:00 AM | 10:30 PM |
| 3:00 AM | 11:30 PM |
| 4:00 AM | 12:30 AMnext day |
| 5:00 AM | 1:30 AMnext day |
| 6:00 AM | 2:30 AMnext day |
| 7:00 AM | 3:30 AMnext day |
| 8:00 AM | 4:30 AMnext day |
| 9:00 AM | 5:30 AMnext day |
| 10:00 AM | 6:30 AMnext day |
| 11:00 AM | 7:30 AMnext day |
| 12:00 PM | 8:30 AMnext day |
| 1:00 PM | 9:30 AMnext day |
| 2:00 PM | 10:30 AMnext day |
| 3:00 PM | 11:30 AMnext day |
| 4:00 PM | 12:30 PMnext day |
| 5:00 PM | 1:30 PMnext day |
| 6:00 PM | 2:30 PMnext day |
| 7:00 PM | 3:30 PMnext day |
| 8:00 PM | 4:30 PMnext day |
| 9:00 PM | 5:30 PMnext day |
| 10:00 PM | 6:30 PMnext day |
| 11:00 PM | 7:30 PMnext day |
Best time to meet between HST and ACST
Working hours overlap (9 AM – 6 PM in both places):
- 1:00 PM – 6:00 PM HST = 9:30 AM – 2:30 PM ACST
The time difference changes during the year because of daylight saving time, so these windows shift by an hour at other times.
Does the time difference between HST and ACST change?
Yes. Right now ACST is 20 hours 30 minutes ahead of HST. These are the dates in the next 12 months when the gap changes:
- Sunday, 4 April 2027: ACST moves its clocks back. ACST is 19 hours 30 minutes ahead of HST from then (it was 20 hours 30 minutes before).
- Sunday, 3 October 2027: ACST moves its clocks forward. ACST is 20 hours 30 minutes ahead of HST from then (it was 19 hours 30 minutes before).
Office hours in each other's time
- 9 AM to 6 PM in HST is 5:30 AM (next day) to 2:30 PM (next day) in ACST.
- 9 AM to 6 PM in ACST is 12:30 PM (previous day) to 9:30 PM (previous day) in HST.
Based on today's clock settings.
Frequently asked questions
What is the time difference between HST and ACST?
ACST is 20 hours 30 minutes ahead of HST right now. The gap is not fixed: it is 19 hours 30 minutes at some times of the year and 20 hours 30 minutes at others, because at least one of them changes its clocks for daylight saving time.
How do I convert HST to ACST?
Add 20 hours 30 minutes to the HST time to get the ACST time (at today's difference). 9:00 AM in HST is 5:30 AM in ACST (next day). Or use the converter above and pick any date and time.
What is the current time in ACST?
It is 10:31 AM in ACST on Tuesday, November 10 (the converter above shows it live). At the same moment it is 2:01 PM in HST.
Does the time difference between HST and ACST change during the year?
Yes. Right now ACST is 20 hours 30 minutes ahead of HST. Over the next 12 months the gap changes 2 times: Sunday, 4 April 2027: ACST moves its clocks back. ACST is 19 hours 30 minutes ahead of HST from then (it was 20 hours 30 minutes before). Sunday, 3 October 2027: ACST moves its clocks forward. ACST is 20 hours 30 minutes ahead of HST from then (it was 19 hours 30 minutes before).
What is the best time for a meeting between HST and ACST?
Between 9 AM and 6 PM in both places you can meet at 1:00 PM – 6:00 PM HST = 9:30 AM – 2:30 PM ACST. Check the overlap section on this page for every option.
What does HST mean?
Hawaii does not use daylight saving time.