What is WIB in ACST?

Australian Central Time is 2 hours 30 minutes ahead

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

Time in Jakarta: 7:52:56 PM
Time in Adelaide: 10:22:56 PM
Difference: +2:30 h
Next clock change: October 4, 2026

Convert a time

WIB — Western Indonesian Time

ACST — Australian Central Time

9:30 pm

ACST, Fri

When the difference changes

Western Indonesian 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:

Now – October 3, 2026Australian Central Time is 2 hours 30 minutes ahead
October 3, 2026 – April 3, 2027Australian Central Time is 3 hours 30 minutes ahead
April 3, 2027 – October 2, 2027Australian Central Time is 2 hours 30 minutes ahead
October 2, 2027 – onwardsAustralian Central Time is 3 hours 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

Western Indonesian Time

No clock changes

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

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.

WIB to ACST conversion table

Every hour of Friday, September 25, 2026, converted from Western Indonesian Time to Australian Central Time. 2 of the 24 hours fall on a different calendar day in Adelaide, which is marked.

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

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

Scheduling between the two

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