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DateAlmanac

What is JST in ACST?

Australian Central Time is 1 hour 30 minutes ahead

Japan Standard Time is on UTC+9:00 and Australian Central Time is on UTC+10:30 right now. Australian Central Time is on daylight saving, so its clocks read ACDT. The gap changes during the year — see below.

Convert a time

ACDT — Australian Central Time

8:30 pm

ACDT, Fri

Time in Tokyo
7:00:49 PM
Time in Adelaide
8:30:49 PM
Difference
+1:30 h
Next clock change
April 4, 2027

When the difference changes

Japan Standard Time and Australian Central Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:

  1. Now – April 4, 2027Australian Central Time is 1 hour 30 minutes ahead
  2. April 4, 2027 – October 3, 2027Australian Central Time is 30 minutes ahead
  3. October 3, 2027 – onwardsAustralian Central Time is 1 hour 30 minutes ahead

Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.

Daylight saving

Japan Standard Time

No clock changes

Japan Standard Time stays on JST all year, so its offset from UTC never moves.

Australian Central Time

Sunday, April 4, 2027

Clocks go back one hour — 3:00 am becomes 2:00 am local time, and the zone is on ACST after that.

JST to ACST conversion table

Every hour of Friday, November 13, 2026, converted from Japan Standard Time to Australian Central Time. 1 of the 24 hours fall on a different calendar day in Adelaide, which is marked.

12:00 am JST
1:30 am ACDT
1:00 am JST
2:30 am ACDT
2:00 am JST
3:30 am ACDT
3:00 am JST
4:30 am ACDT
4:00 am JST
5:30 am ACDT
5:00 am JST
6:30 am ACDT
6:00 am JST
7:30 am ACDT
7:00 am JST
8:30 am ACDT
8:00 am JST
9:30 am ACDT
9:00 am JST
10:30 am ACDT
10:00 am JST
11:30 am ACDT
11:00 am JST
12:30 pm ACDT
12:00 pm JST
1:30 pm ACDT
1:00 pm JST
2:30 pm ACDT
2:00 pm JST
3:30 pm ACDT
3:00 pm JST
4:30 pm ACDT
4:00 pm JST
5:30 pm ACDT
5:00 pm JST
6:30 pm ACDT
6:00 pm JST
7:30 pm ACDT
7:00 pm JST
8:30 pm ACDT
8:00 pm JST
9:30 pm ACDT
9:00 pm JST
10:30 pm ACDT
10:00 pm JST
11:30 pm ACDT
11:00 pm JST
12:30 am ACDT+1 day

Scheduling between the two

Working hours overlap from 9:00 am to 5:00 pm JST, which is 10:30 am to 6:30 pm ACDT. Anything inside that window falls in the normal working day at both ends.

Australian Central Time (ACDT) is used in South Australia and the Northern Territory, on a half-hour offset from the east coast

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