What is ACST in WIB?

Western Indonesian Time is 2 hours 30 minutes behind

Australian Central Time is on UTC+9:30 and Western Indonesian Time is on UTC+7:00 right now. The gap changes during the year — see below.

Time in Adelaide: 9:33:50 PM
Time in Jakarta: 7:03:50 PM
Difference: −2:30 h
Next clock change: October 4, 2026

Convert a time

ACST — Australian Central Time

WIB — Western Indonesian Time

6:30 pm

WIB, Fri

When the difference changes

Australian Central Time and Western Indonesian 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:

Now – October 4, 2026Western Indonesian Time is 2 hours 30 minutes behind
October 4, 2026 – April 4, 2027Western Indonesian Time is 3 hours 30 minutes behind
April 4, 2027 – October 3, 2027Western Indonesian Time is 2 hours 30 minutes behind
October 3, 2027 – onwardsWestern Indonesian Time is 3 hours 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.

Western Indonesian Time

No clock changes

Western Indonesian Time stays on WIB all year, so its offset from UTC never moves.

ACST to WIB conversion table

Every hour of Friday, September 25, 2026, converted from Australian Central Time to Western Indonesian Time. 3 of the 24 hours fall on a different calendar day in Jakarta, which is marked.

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

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

Scheduling between the two

Working hours overlap from 12:00 pm to 6:00 pm ACST, which is 9:30 am to 3:30 pm WIB. 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