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Convert AEDT to ACST

ACST is 1 hour 30 minutes behind AEDT. AEDT is UTC+11 and ACST is UTC+9:30.

Right now: AEDT · ACST

Best time to schedule a meeting

Standard 9–5 working hours overlap for 6 hours: 11:00 AM–5:00 PM AEDT (9:00 AM–3:00 PM ACST). Schedule meetings inside that window.

AEDTACSTSuitable?
9:00 AM7:30 AMoutside 9–5
10:00 AM8:30 AMoutside 9–5
11:00 AM9:30 AMworking hours
12:00 PM10:30 AMworking hours
1:00 PM11:30 AMworking hours
2:00 PM12:30 PMworking hours
3:00 PM1:30 PMworking hours
4:00 PM2:30 PMworking hours
5:00 PM3:30 PMworking hours

AEDT to ACST conversion table

AEDTACST
12:00 AM10:30 PM (previous day)
1:00 AM11:30 PM (previous day)
2:00 AM12:30 AM
3:00 AM1:30 AM
4:00 AM2:30 AM
5:00 AM3:30 AM
6:00 AM4:30 AM
7:00 AM5:30 AM
8:00 AM6:30 AM
9:00 AM7:30 AM
10:00 AM8:30 AM
11:00 AM9:30 AM
12:00 PM10:30 AM
1:00 PM11:30 AM
2:00 PM12:30 PM
3:00 PM1:30 PM
4:00 PM2:30 PM
5:00 PM3:30 PM
6:00 PM4:30 PM
7:00 PM5:30 PM
8:00 PM6:30 PM
9:00 PM7:30 PM
10:00 PM8:30 PM
11:00 PM9:30 PM

About AEDT

Australian Eastern Daylight Time (AEDT) is UTC+11. It is used in Sydney and Melbourne from October to April.

Australian Eastern Daylight Time is UTC+11, the summer clock for Sydney, Melbourne and Canberra — and summer here means October to April, the opposite half of the year from the northern hemisphere. That inversion is what makes Australia–Europe scheduling awkward: for a few weeks each spring and autumn the two regions are shifting in opposite directions, and the offset between them changes twice within a month.

About ACST

Australian Central Standard Time (ACST) is UTC+9:30. It is used in Adelaide and Darwin in winter.

Australian Central Standard Time is UTC+9:30, half an hour behind the eastern states rather than a whole hour, which surprises people every time. South Australia moves to daylight saving in October and the Northern Territory does not, so Adelaide and Darwin share this offset for half the year and are an hour apart for the other half.

Does this gap change with the seasons?

This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on AEDT switches to AEST (UTC+10) from April to October. So the 1.5-hour figure on this page is correct for the part of the year when both places are actually on these abbreviations, and changes by an hour outside it.

ACST does not shift, so the whole change comes from one side. A recurring meeting fixed in ACST will appear to move by an hour for everyone on the other side, twice a year, without anyone changing anything.

This is the reason scheduling systems store an IANA zone such as Region/City rather than an offset or an abbreviation: the zone knows its own rules and the offset does not.

Frequently asked questions

What time is 9:00 AM AEDT in ACST?

9:00 AM AEDT is 7:30 AM ACST.

Is ACST ahead of AEDT?

ACST is 1 hour 30 minutes behind AEDT.

Which time zone does this use?

AEDT is UTC+11 and ACST is UTC+9:30. Both abbreviations denote a single fixed offset, so this conversion never shifts with daylight saving — what changes is which abbreviation a place is using at the time.

Other AEDT conversions

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