World Timezones

GST to ACST Converter

Compare ACST to GST instead
Gulf Standard Time8:36 amFri, Jun 5
Gulf Standard TimeGST
Middle East · UTC+4
8:36 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
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
4a

Offset

The time difference between Gulf Standard Time and Australian Central Time is 5.5 hours.

5.5 hours

Gulf Standard Time (GST) is behind Australian Central Time (ACST).

GST: UTC+4

ACST: UTC+9:30

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

When to schedule

Business-hours overlap: 9 AM–12 PM in Gulf Standard Time (2 PM–5 PM in Australian Central Time).

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

Suggested time: 10:00 AM Gulf Standard Time (3:30 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.

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

Gulf Standard Time is also known as GST. To call United Arab Emirates, dial +971.

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

Australian Central Time is approximately 6,850 miles southeast of Gulf Standard Time.

Quick reference

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

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

Daylight saving time

Australian Central Time observes daylight saving time; Gulf 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

Gulf Standard Time
Sunrise
5:29 AM
Sunset
7:07 PM
Day length
13h 38m
Australian Central Time
Sunrise
7:18 AM
Sunset
5:12 PM
Day length
9h 55m

Daylight overlap: 6h 13m — 5:29 AM–11:42 AM in Gulf Standard Time (10:59 AM–5:12 PM in Australian Central Time). Both locations are in daylight during this window.

Cities in these zones

Cities in Gulf Standard Time

Cities in Australian Central Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Gulf Standard Time

  • DWC
  • DXB
  • SHJ
  • AUH

Airports in Australian Central Time

  • ADL

Related conversions

Common conversions

What is 9:00 am GST in ACST?
9:00 am GST is 2:30 pm ACST.
What is 12:00 pm GST in ACST?
12:00 pm GST is 5:30 pm ACST.
What is 12:30 pm GST in ACST?
12:30 pm GST is 6:00 pm ACST.
What is 2:00 pm GST in ACST?
2:00 pm GST is 7:30 pm ACST.
What is 5:00 pm GST in ACST?
5:00 pm GST is 10:30 pm ACST.
What is 11:30 pm GST in ACST?
11:30 pm GST is 5:00 am ACST, the next day.