What is the time difference between ACST and GMT?

ACST is 9.5 hours behind GMT. ACST is UTC+9.5 and GMT is UTC+0.

What is 9 AM ACST in GMT?

9 AM ACST is 11:30 PM GMT (previous day).

What is 12 PM ACST in GMT?

12 PM ACST (noon) is 2:30 AM GMT.

What are the best meeting times between ACST and GMT?

Best overlap hours: 6 PM ACST = 8:30 AM GMT.

ACST to GMT Time Converter

Australian Central Standard Time → Greenwich Mean Time

ACST

UTC+9.5

Australian Central Standard Time

offset

-9.5h

GMT is 9.5h behind

GMT

UTC+0

Greenwich Mean Time

GMT observes DST — offset shifts ±1h during transitions

Australian Central Standard Time (ACST) is 9.5 hours behind Greenwich Mean Time (GMT). When it is noon in ACST, it is 2:30 AM in GMT. This offset may change during Daylight Saving Time transitions.

Meeting planner tool Reverse: GMT to ACST

Cities in GMT

🇬🇧London 🇵🇹Lisbon 🇮🇪Dublin 🇬🇭Accra

All 24 Hours — ACST to GMT

Click any row to see the full detail page. Current hour in ACST is highlighted.

Both business hoursPartial overlap

12 AM6 AM12 PM6 PM11 PM

Best Meeting Times — ACST & GMT

Recommended windows where both ACST and GMT participants are within working hours (8 AM–6 PM).

ACSTGMTRatingDetail page

6 PM

8:30 AM

Best

6 PM →

5 PM

7:30 AM

Good

5 PM →

7 PM

9:30 AM

Good

7 PM →

Tip: When scheduling between ACST and GMT, aim for the “Best” windows above. These times keep both parties within normal working hours, avoiding early-morning or late-evening fatigue. Note that one of these time zones observes Daylight Saving Time — the offset may shift ±1 hour around transition dates.

8 AM→10:30 PM−1d 9 AM→11:30 PM−1d 10 AM→12:30 AM 11 AM→1:30 AM 12 PM→2:30 AM 1 PM→3:30 AM 2 PM→4:30 AM 3 PM→5:30 AM 4 PM→6:30 AM 5 PM→7:30 AM

Related Time Zone Conversions

Frequently Asked Questions — ACST to GMT

Australian Central Standard Time (ACST) is 9.5 hours behind Greenwich Mean Time (GMT). ACST is UTC+9.5 and GMT is UTC+0. This offset may shift by ±1 hour during Daylight Saving Time transitions.