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DateAlmanac

What is ACST in JST?

Japan Standard Time is 30 minutes behind

Australian Central Time is on UTC+9:30 and Japan Standard Time is on UTC+9:00 right now. The gap changes during the year — see below.

Time in Adelaide
10:22:44 PM
Time in Tokyo
9:52:44 PM
Difference
−0:30 h
Next clock change
October 4, 2026

Convert a time

JST — Japan Standard Time

9:30 pm

JST, Fri

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 – October 4, 2026Japan Standard Time is 30 minutes behind
  2. October 4, 2026 – April 4, 2027Japan Standard Time is 1 hour 30 minutes behind
  3. April 4, 2027 – October 3, 2027Japan Standard Time is 30 minutes behind
  4. 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, October 4, 2026

Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on ACDT 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, September 25, 2026, converted from Australian Central Time to Japan Standard Time. 1 of the 24 hours fall on a different calendar day in Tokyo, which is marked.

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

Scheduling between the two

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

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

Other conversions