World Timezones

AST to ACST Converter

Compare ACST to AST instead
Arabia Standard Time7:36 amFri, Jun 5
Arabia Standard TimeAST
Middle East · UTC+3
7:36 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
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
4a
5a

Offset

The time difference between Arabia Standard Time and Australian Central Time is 6.5 hours.

6.5 hours

Arabia Standard Time (AST) is behind Australian Central Time (ACST).

AST: UTC+3

ACST: UTC+9:30

Neither Arabia Standard Time nor Australian Central Time is currently observing daylight saving time.

When to schedule

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

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

Suggested time: 10:00 AM Arabia Standard Time (4:30 PM Australian Central Time).

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

Note: the working week in Saudi Arabia runs Sunday–Thursday; Friday–Saturday is the weekend, so overlap on those days is limited.

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.

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

Arabia Standard Time is also known as AST. To call Saudi Arabia, dial +966.

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

Australian Central Time is approximately 7,300 miles southeast of Arabia Standard Time.

Quick reference

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

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

Daylight saving time

Australian Central Time observes daylight saving time; Arabia Standard 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

Arabia Standard Time
Sunrise
5:05 AM
Sunset
6:41 PM
Day length
13h 36m
Australian Central Time
Sunrise
7:18 AM
Sunset
5:12 PM
Day length
9h 55m

Daylight overlap: 5h 38m — 5:05 AM–10:42 AM in Arabia Standard Time (11:35 AM–5:12 PM in Australian Central Time). Both locations are in daylight during this window.

Cities in these zones

Cities in Arabia Standard Time

Cities in Australian Central Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Arabia Standard Time

  • JED
  • RUH
  • MED
  • DMM

Airports in Australian Central Time

  • ADL

Related conversions

Common conversions

What is 9:00 am AST in ACST?
9:00 am AST is 3:30 pm ACST.
What is 12:00 pm AST in ACST?
12:00 pm AST is 6:30 pm ACST.
What is 12:30 pm AST in ACST?
12:30 pm AST is 7:00 pm ACST.
What is 2:00 pm AST in ACST?
2:00 pm AST is 8:30 pm ACST.
What is 5:00 pm AST in ACST?
5:00 pm AST is 11:30 pm ACST.
What is 11:30 pm AST in ACST?
11:30 pm AST is 6:00 am ACST, the next day.