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What is ACST in JST?

Japan Standard Time is 1 hour 30 minutes behind

Australian Central Time is on UTC+10:30 and Japan Standard Time is on UTC+9:00 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

JST — Japan Standard Time

6:30 pm

JST, Fri

Time in Adelaide
8:38:46 PM
Time in Tokyo
7:08:46 PM
Difference
−1:30 h
Next clock change
April 4, 2027

When the difference changes

Australian Central Time and Japan Standard 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, 2027Japan Standard Time is 1 hour 30 minutes behind
  2. April 4, 2027 – October 3, 2027Japan Standard Time is 30 minutes behind
  3. October 3, 2027 – onwardsJapan Standard Time is 1 hour 30 minutes behind

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

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.

Japan Standard Time

No clock changes

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

ACST to JST conversion table

Every hour of Friday, November 13, 2026, converted from Australian Central Time to Japan Standard Time. 2 of the 24 hours fall on a different calendar day in Tokyo, which is marked.

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

Scheduling between the two

Working hours overlap from 11:00 am to 6:00 pm ACDT, which is 9:30 am to 4:30 pm JST. 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

Other conversions