Convert AEST to ACDT
ACDT is 30 minutes ahead of AEST. AEST is UTC+10 and ACDT is UTC+10:30.
Right now: AEST · ACDT
Best time to schedule a meeting
Standard 9–5 working hours overlap for 8 hours: 9:00 AM–5:00 PM AEST (9:00 AM–5:00 PM ACDT). Schedule meetings inside that window.
| AEST | ACDT | Suitable? |
|---|---|---|
| 9:00 AM | 9:30 AM | working hours |
| 10:00 AM | 10:30 AM | working hours |
| 11:00 AM | 11:30 AM | working hours |
| 12:00 PM | 12:30 PM | working hours |
| 1:00 PM | 1:30 PM | working hours |
| 2:00 PM | 2:30 PM | working hours |
| 3:00 PM | 3:30 PM | working hours |
| 4:00 PM | 4:30 PM | working hours |
| 5:00 PM | 5:30 PM | outside 9–5 |
AEST to ACDT conversion table
| AEST | ACDT |
|---|---|
| 12:00 AM | 12:30 AM |
| 1:00 AM | 1:30 AM |
| 2:00 AM | 2:30 AM |
| 3:00 AM | 3:30 AM |
| 4:00 AM | 4:30 AM |
| 5:00 AM | 5:30 AM |
| 6:00 AM | 6:30 AM |
| 7:00 AM | 7:30 AM |
| 8:00 AM | 8:30 AM |
| 9:00 AM | 9:30 AM |
| 10:00 AM | 10:30 AM |
| 11:00 AM | 11:30 AM |
| 12:00 PM | 12:30 PM |
| 1:00 PM | 1:30 PM |
| 2:00 PM | 2:30 PM |
| 3:00 PM | 3:30 PM |
| 4:00 PM | 4:30 PM |
| 5:00 PM | 5:30 PM |
| 6:00 PM | 6:30 PM |
| 7:00 PM | 7:30 PM |
| 8:00 PM | 8:30 PM |
| 9:00 PM | 9:30 PM |
| 10:00 PM | 10:30 PM |
| 11:00 PM | 11:30 PM |
About AEST
Australian Eastern Standard Time (AEST) is UTC+10. It is used in Sydney, Melbourne and Brisbane in the southern winter.
Australian Eastern Standard Time is UTC+10, covering Sydney, Melbourne, Brisbane and Canberra in winter. The complication is that Queensland does not observe daylight saving while New South Wales and Victoria do — so from October to April, Brisbane stays on AEST while Sydney moves to AEDT, and two cities on the same coast are an hour apart for half the year.
About ACDT
Australian Central Daylight Time (ACDT) is UTC+10:30. It is used in Adelaide in summer.
Australian Central Daylight Time is UTC+10:30, what South Australia keeps from October to April. Darwin stays on ACST through the summer, so for those months two cities in the same nominal zone are an hour apart — the only reason to be precise about which of the two abbreviations a meeting invitation carries.
Does this gap change with the seasons?
This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on AEST switches to AEDT (UTC+11) from October to April. So the 0.5-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.
ACDT does not shift, so the whole change comes from one side. A recurring meeting fixed in ACDT 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 AEST in ACDT?
9:00 AM AEST is 9:30 AM ACDT.
Is ACDT ahead of AEST?
ACDT is 30 minutes ahead of AEST.
Which time zone does this use?
AEST is UTC+10 and ACDT is UTC+10:30. 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.