JST to ACST/ACDT time converter
ACST/ACDT is 1 hour 30 minutes ahead of JST. When it is 9:00 AM in JST, it is 10:30 AM in ACST/ACDT.
Finding your time zone…
4:09 AM in JST, Saturday, October 17, 2026
Shared working hours (9:00–18:00)
JST to ACST/ACDT conversion table
Every hour of today in JST and the matching time in ACST/ACDT. Light rows are typical working hours (9:00–18:00).
| JST | ACST/ACDT |
|---|---|
| 12:00 AM | 1:30 AM |
| 1:00 AM | 2:30 AM |
| 2:00 AM | 3:30 AM |
| 3:00 AM | 4:30 AM |
| 4:00 AM | 5:30 AM |
| 5:00 AM | 6:30 AM |
| 6:00 AM | 7:30 AM |
| 7:00 AM | 8:30 AM |
| 8:00 AM | 9:30 AM |
| 9:00 AM | 10:30 AM |
| 10:00 AM | 11:30 AM |
| 11:00 AM | 12:30 PM |
| 12:00 PM | 1:30 PM |
| 1:00 PM | 2:30 PM |
| 2:00 PM | 3:30 PM |
| 3:00 PM | 4:30 PM |
| 4:00 PM | 5:30 PM |
| 5:00 PM | 6:30 PM |
| 6:00 PM | 7:30 PM |
| 7:00 PM | 8:30 PM |
| 8:00 PM | 9:30 PM |
| 9:00 PM | 10:30 PM |
| 10:00 PM | 11:30 PM |
| 11:00 PM | 12:30 AM+1 day |
Best time to call or meet
Both sides are at work from 9:00 AM – 4:30 PM in JST (10:30 AM – 6:00 PM in ACST/ACDT).
Daylight saving time and the difference
The difference changes during the year because JST and ACST/ACDT switch clocks on different dates:
- Oct 17, 2026 – Apr 4, 2027: +1h 30m
- Apr 4, 2027 – Oct 3, 2027: +30m
- Oct 3, 2027 – Oct 17, 2027: +1h 30m
More conversions
Questions and answers
What is the time difference between JST and ACST/ACDT?
ACST/ACDT is 1 hour 30 minutes ahead of JST.
What time is it in ACST/ACDT when it is 9 AM in JST?
When it is 9:00 AM in JST, it is 10:30 AM in ACST/ACDT.
When is the best time to call ACST/ACDT from JST?
Both sides are at work from 9:00 AM – 4:30 PM in JST (10:30 AM – 6:00 PM in ACST/ACDT).
Does the time difference between JST and ACST/ACDT change?
Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.