World Timezones

WIB to ACST Converter

Compare ACST to WIB instead
Western Indonesia Time11:36 amFri, Jun 5
Western Indonesia TimeWIB
Asia · UTC+7
11:36 amFri, Jun 5
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
Australian Central TimeACST
Oceania · UTC+9:30
2:06 pmFri, Jun 5
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a

Offset

The time difference between Western Indonesia Time and Australian Central Time is 2.5 hours.

2.5 hours

Western Indonesia Time (WIB) is behind Australian Central Time (ACST).

WIB: UTC+7

ACST: UTC+9:30

Neither Western Indonesia Time nor Australian Central Time is currently observing daylight saving time.

When to schedule

Business-hours overlap: 9 AM–3 PM in Western Indonesia Time (11 AM–5 PM in Australian Central Time).

Both teams are in working hours during this window on weekdays.

Suggested time: 12:00 PM Western Indonesia Time (2:30 PM Australian Central Time).

This window may shift by an hour during daylight saving time.

Public holidays in 2026

National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.

Indonesia

  • New Year's DayThu, Jan 1
  • Good FridayFri, Apr 3
  • Easter SundaySun, Apr 5
  • Labour DayFri, May 1
  • Ascension DayThu, May 14
  • Pancasila DayMon, Jun 1
  • Independence DayMon, Aug 17
  • Christmas DayFri, Dec 25

Australia

  • New Year's DayThu, Jan 1
  • Australia DayMon, Jan 26
  • Good FridayFri, Apr 3
  • Easter MondayMon, Apr 6
  • Christmas DayFri, Dec 25
  • St. Stephen's DayMon, Dec 28

About these zones

Western Indonesia Time is also known as WIB. To call Indonesia, dial +62.

Australian Central Time is also known as ACST, or ACDT. To call Australia, dial +61.

Australian Central Time is approximately 2,850 miles southeast of Western Indonesia Time.

Quick reference

Full 24-hour conversion table — tap any time to open it in the converter.

WIBACSTDay
12:00 am2:30 amSame day
1:00 am3:30 amSame day
2:00 am4:30 amSame day
3:00 am5:30 amSame day
4:00 am6:30 amSame day
5:00 am7:30 amSame day
6:00 am8:30 amSame day
7:00 am9:30 amSame day
8:00 am10:30 amSame day
9:00 am11:30 amSame day
10:00 am12:30 pmSame day
11:00 am1:30 pmSame day
12:00 pm2:30 pmSame day
1:00 pm3:30 pmSame day
2:00 pm4:30 pmSame day
3:00 pm5:30 pmSame day
4:00 pm6:30 pmSame day
5:00 pm7:30 pmSame day
6:00 pm8:30 pmSame day
7:00 pm9:30 pmSame day
8:00 pm10:30 pmSame day
9:00 pm11:30 pmSame day
10:00 pm12:30 am+1 day
11:00 pm1:30 am+1 day

Daylight saving time

Australian Central Time observes daylight saving time; Western Indonesia Time does not. The offset between the two zones changes when Australian Central Time transitions: on Sunday, October 4, 2026, clocks spring forward from ACST to ACDT.

See the daylight saving time page for transition dates across every time zone.

Daylight today

Western Indonesia Time
Sunrise
5:59 AM
Sunset
5:45 PM
Day length
11h 47m
Australian Central Time
Sunrise
7:18 AM
Sunset
5:12 PM
Day length
9h 55m

Daylight overlap: 8h 44m — 5:59 AM–2:42 PM in Western Indonesia Time (8:29 AM–5:12 PM in Australian Central Time). Both locations are in daylight during this window.

Cities in these zones

Cities in Australian Central Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Western Indonesia Time

  • CGK
  • HLP
  • SUB
  • BDO
  • KNO
  • PLM
  • SRG

Airports in Australian Central Time

  • ADL

Related conversions

Common conversions

What is 9:00 am WIB in ACST?
9:00 am WIB is 11:30 am ACST.
What is 12:00 pm WIB in ACST?
12:00 pm WIB is 2:30 pm ACST.
What is 12:30 pm WIB in ACST?
12:30 pm WIB is 3:00 pm ACST.
What is 2:00 pm WIB in ACST?
2:00 pm WIB is 4:30 pm ACST.
What is 5:00 pm WIB in ACST?
5:00 pm WIB is 7:30 pm ACST.
What is 11:30 pm WIB in ACST?
11:30 pm WIB is 2:00 am ACST, the next day.