World Timezones

IRST to ACST Converter

Compare ACST to IRST instead
Iran Standard Time8:06 amFri, Jun 5
Iran Standard TimeIRST
Middle East · UTC+3:30
8:06 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 Iran Standard Time and Australian Central Time is 6 hours.

6 hours

Iran Standard Time (IRST) is behind Australian Central Time (ACST).

IRST: UTC+3:30

ACST: UTC+9:30

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

When to schedule

Business-hours overlap: 9 AM–11 AM in Iran 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 Iran Standard Time (4:00 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.

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

Iran Standard Time is also known as IRST. To call Iran, dial +98.

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

Australian Central Time is approximately 7,450 miles southeast of Iran Standard Time.

Quick reference

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

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

Daylight saving time

Australian Central Time observes daylight saving time; Iran 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

Iran Standard Time
Sunrise
4:50 AM
Sunset
7:18 PM
Day length
14h 28m
Australian Central Time
Sunrise
7:18 AM
Sunset
5:12 PM
Day length
9h 55m

Daylight overlap: 6h 22m — 4:50 AM–11:12 AM in Iran Standard Time (10:50 AM–5:12 PM in Australian Central Time). Both locations are in daylight during this window.

Cities in these zones

Cities in Iran Standard Time

Cities in Australian Central Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Iran Standard Time

  • IKA
  • THR
  • MHD
  • IFN
  • PYK
  • TBZ

Airports in Australian Central Time

  • ADL

Related conversions

Common conversions

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