Offset
The time difference between Australian Central Time and Japan Standard Time is 0.5 hours.
Australian Central Time (ACST) is ahead of Japan Standard Time (JST).
ACST: UTC+9:30
JST: UTC+9
Neither Australian Central Time nor Japan Standard Time is currently observing daylight saving time.
When to schedule
Business-hours overlap: 10 AM–5 PM in Australian Central Time (9 AM–4 PM in Japan Standard Time).
Both teams are in working hours during this window on weekdays.
Suggested time: 1:00 PM Australian Central Time (12:30 PM Japan Standard Time).
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
Australia
- New Year's DayThu, Jan 1
- Australia DayMon, Jan 26
- Good FridayFri, Apr 3
- Easter MondayMon, Apr 6
- Christmas DayFri, Dec 25
- St. Stephen's DayMon, Dec 28
Japan
- New Year's DayThu, Jan 1
- Coming of Age DayMon, Jan 12
- Foundation DayWed, Feb 11
- The Emperor's BirthdayMon, Feb 23
- Vernal Equinox DayFri, Mar 20
- Shōwa DayWed, Apr 29
- Constitution Memorial DayWed, May 6
- Greenery DayMon, May 4
- Children's DayTue, May 5
- Marine DayMon, Jul 20
- Mountain DayTue, Aug 11
- Respect for the Aged DayMon, Sep 21
- Autumnal Equinox DayWed, Sep 23
- Sports DayMon, Oct 12
- Culture DayTue, Nov 3
- Labour Thanksgiving DayMon, Nov 23
About these zones
Australian Central Time is also known as ACST, or ACDT. To call Australia, dial +61.
Japan Standard Time is also known as JST. To call Japan, dial +81.
Japan Standard Time is approximately 4,900 miles north of Australian Central Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| ACST | JST | Day |
|---|---|---|
| 12:00 am | 11:30 pm | -1 day |
| 1:00 am | 12:30 am | Same day |
| 2:00 am | 1:30 am | Same day |
| 3:00 am | 2:30 am | Same day |
| 4:00 am | 3:30 am | Same day |
| 5:00 am | 4:30 am | Same day |
| 6:00 am | 5:30 am | Same day |
| 7:00 am | 6:30 am | Same day |
| 8:00 am | 7:30 am | Same day |
| 9:00 am | 8:30 am | Same day |
| 10:00 am | 9:30 am | Same day |
| 11:00 am | 10:30 am | Same day |
| 12:00 pm | 11:30 am | Same day |
| 1:00 pm | 12:30 pm | Same day |
| 2:00 pm | 1:30 pm | Same day |
| 3:00 pm | 2:30 pm | Same day |
| 4:00 pm | 3:30 pm | Same day |
| 5:00 pm | 4:30 pm | Same day |
| 6:00 pm | 5:30 pm | Same day |
| 7:00 pm | 6:30 pm | Same day |
| 8:00 pm | 7:30 pm | Same day |
| 9:00 pm | 8:30 pm | Same day |
| 10:00 pm | 9:30 pm | Same day |
| 11:00 pm | 10:30 pm | Same day |
Daylight saving time
Australian Central Time observes daylight saving time; Japan Standard Time does not. The offset between the two zones changes when Australian Central Time transitions: on Sunday, October 4, 2026, clocks spring forward from ACST to ACDT.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 7:18 AM
- Sunset
- 5:12 PM
- Day length
- 9h 55m
- Sunrise
- 4:27 AM
- Sunset
- 6:55 PM
- Day length
- 14h 28m
Daylight overlap: 9h 55m — 7:18 AM–5:12 PM in Australian Central Time (6:48 AM–4:42 PM in Japan Standard Time). Both locations are in daylight during this window.
Cities in these zones
Cities in Australian Central Time
Cities in Japan Standard Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Australian Central Time
- ADL
Airports in Japan Standard Time
- HND
- NRT
- ITM
- KIX
- UKB
- NGO
- NKM
- CTS
- OKD
- FUK
Related conversions
Common conversions
- What is 9:00 am ACST in JST?
- 9:00 am ACST is 8:30 am JST.
- What is 12:00 pm ACST in JST?
- 12:00 pm ACST is 11:30 am JST.
- What is 12:30 pm ACST in JST?
- 12:30 pm ACST is 12:00 pm JST.
- What is 2:00 pm ACST in JST?
- 2:00 pm ACST is 1:30 pm JST.
- What is 5:00 pm ACST in JST?
- 5:00 pm ACST is 4:30 pm JST.
- What is 11:30 pm ACST in JST?
- 11:30 pm ACST is 11:00 pm JST.