World Timezones

ACST to AST Converter

Compare AST to ACST instead
Australian Central Time2:06 pmFri, Jun 5
Australian Central TimeACST
Oceania · UTC+9:30
2:06 pmFri, 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
Arabia Standard TimeAST
Middle East · UTC+3
7:36 amFri, Jun 5
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p

Offset

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

6.5 hours

Australian Central Time (ACST) is ahead of Arabia Standard Time (AST).

ACST: UTC+9:30

AST: UTC+3

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

When to schedule

Business-hours overlap: 4 PM–5 PM in Australian Central Time (9 AM–10 AM in Arabia Standard Time).

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

Suggested time: 4:00 PM Australian Central Time (9:30 AM Arabia Standard 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

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

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

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

Quick reference

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

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

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

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

Cities in these zones

Cities in Australian Central Time

Cities in Arabia Standard Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Australian Central Time

  • ADL

Airports in Arabia Standard Time

  • JED
  • RUH
  • MED
  • DMM

Related conversions

Common conversions

What is 9:00 am ACST in AST?
9:00 am ACST is 2:30 am AST.
What is 12:00 pm ACST in AST?
12:00 pm ACST is 5:30 am AST.
What is 12:30 pm ACST in AST?
12:30 pm ACST is 6:00 am AST.
What is 2:00 pm ACST in AST?
2:00 pm ACST is 7:30 am AST.
What is 5:00 pm ACST in AST?
5:00 pm ACST is 10:30 am AST.
What is 11:30 pm ACST in AST?
11:30 pm ACST is 5:00 pm AST.