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