AEDT to ACST
-1h 30mAEDT
AEDTSOURCEACST
ACSTGreen rows indicate typical business hours (9 AM - 5 PM)
AEDT and ACST on the World Map
The map below highlights the AEDT (Australian Eastern Daylight Time) and ACST (Australian Central Standard Time) timezone regions across the globe.
AEDT – Australian Eastern Daylight Time
UTC+11:00Australian Eastern Daylight Time (AEDT, UTC+11:00) is the daylight saving period in south-eastern Australia, from October to April.
- •AEDT runs from the first Sunday in October to the first Sunday in April.
- •AEDT is one hour ahead of Australian Eastern Standard Time (AEST).
- •Queensland does not observe daylight saving, so Brisbane stays on AEST.
- •During AEDT, Sydney is 16 hours ahead of New York and 11 hours ahead of UTC.
ACST – Australian Central Standard Time
UTC+09:30Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.
- •ACST uses a half-hour offset: UTC+09:30.
- •South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
- •Adelaide and Darwin are 30 minutes apart during daylight saving, level in winter.
- •Adelaide is one of the few major cities on a 30-minute offset.
Everything You Need to Know About AEDT and ACST Time
AEDT runs on Australian Eastern Daylight Time (AEDT) at UTC+11:00. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts AEDT 1 hour 30 minutes behind ACST — a difference of -1h 30m at the current offsets.
In practice, when it is 9:00 AM in AEDT it is 7:30 AM in ACST. Midnight in AEDT is 10:30 PM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AEDT to ACST time conversion table
| AEDT (AEDT) | ACST (ACST) | Day |
|---|---|---|
| 12:00 AM | 10:30 PM | previous day |
| 6:00 AM | 4:30 AM | same day |
| 7:00 AM | 5:30 AM | same day |
| 8:00 AM | 6:30 AM | same day |
| 9:00 AM | 7:30 AM | same day |
| 12:00 PM | 10:30 AM | same day |
| 3:00 PM | 1:30 PM | same day |
| 5:00 PM | 3:30 PM | same day |
| 6:00 PM | 4:30 PM | same day |
| 9:00 PM | 7:30 PM | same day |
Why people convert AEDT to ACST time
- Scheduling a call from AEDT to ACST: a 10:00 AM start in AEDT lands at 8:30 AM in ACST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AEDT and ACST are inside the 9-to-5 working day between 10:30 AM and 5:00 PM AEDT time (9:00 AM–3:30 PM ACST). That is roughly 6 hours 30 minutes of usable overlap.
- Watching a live event or market open: AEDT viewers need 7:30 AM in ACST to catch a 9:00 AM start there, and 1:30 AM if the event is anchored to AEDT.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEDT" is unambiguous; "3 PM" across a -1h 30m gap is not.
- Block 10:30 AM–5:00 PM AEDT as the recurring meeting window if you work primarily from AEDT and need ACST colleagues present.
About AEDT (Australian Eastern Daylight Time)
Australian Eastern Daylight Time (AEDT) is the daylight saving period in south-eastern Australia, one hour ahead of Australian Eastern Standard Time (AEST, UTC+10:00). Because Australia is in the southern hemisphere, AEDT runs through the summer — from the first Sunday in October to the first Sunday in April — which is almost exactly the reverse of the European and North American schedules. New South Wales, Victoria, Tasmania and the Australian Capital Territory observe it; Queensland and the Northern Territory do not, so Brisbane stays on AEST year round while Sydney moves to AEDT. During AEDT, Sydney is 11 hours ahead of UTC and 16 hours ahead of New York.
About ACST (Australian Central Standard Time)
Australian Central Standard Time (ACST) is the half-hour offset of UTC+09:30 used across South Australia and the Northern Territory, taking in Adelaide and Darwin. South Australia moves to Australian Central Daylight Time (ACDT, UTC+10:30) from the first Sunday in October to the first Sunday in April, but the Northern Territory does not observe daylight saving — so Adelaide and Darwin sit 30 minutes apart in summer and level with each other in winter. The half-hour offset means Adelaide is 30 minutes behind Sydney in winter and level with it during daylight saving, which regularly catches out travellers and meeting planners.
Best time to call between AEDT and ACST
Both AEDT and ACST sit inside the 9 AM – 5 PM working day between 10:30 AM–5:00 PM AEDT, which is 9:00 AM–3:30 PM ACST. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
AEDT and ACST share 6 hours of working-hours overlap (10:30 AM–5:00 PM AEDT), so scheduling a live meeting is straightforward.
AEDT is 1 hour 30 minutes behind ACST (AEDT UTC+11:00 → ACST UTC+09:30). The shared working window is 10:30 AM–5:00 PM AEDT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AEDT
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between AEDT and ACST?
AEDT (AEDT, UTC+11:00) is 1 hour 30 minutes behind ACST (ACST, UTC+09:30). The gap is currently -1h 30m.
How do I convert AEDT time to ACST time?
Add -1h 30m to AEDT local time. For example, 9:00 AM in AEDT is 7:30 AM in ACST.
What time is it in ACST right now?
ACST uses ACST at UTC+09:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h 30m offset from AEDT.
What is the best time to call ACST from AEDT?
Call between 10:30 AM and 5:00 PM AEDT — that maps to 9:00 AM–3:30 PM ACST and keeps both parties inside the working day.
Which is behind, AEDT or ACST?
AEDT is 1 hour 30 minutes behind ACST. When it is 12:00 PM in AEDT it is 10:30 AM in ACST.
Does daylight saving time affect the AEDT–ACST difference?
Neither zone observes daylight saving time, so the -1h 30m offset between AEDT and ACST is fixed all year.
Which other cities share AEDT's time zone?
AEDT also covers Sydney, Melbourne, Canberra, Hobart, Newcastle.
Which countries use AEDT, AEDT's zone?
AEDT is used in Australia (NSW, Victoria, Tasmania, ACT).
Is there a day difference between AEDT and ACST?
Not normally. The -1h 30m gap only pushes the date over the previous day.
What is the time difference between AEDT and ACST?
ACST is -1h 30m from AEDT.
What timezone is AEDT in?
AEDT operates on its local timezone.
What timezone is ACST in?
ACST operates on its local timezone.
Which countries use AEDT (Australian Eastern Daylight Time)?
AEDT is used in Australia (NSW, Victoria, Tasmania, ACT).
Does AEDT observe daylight saving time?
Yes, AEDT switches to AEDT during summer months.
What are some interesting facts about AEDT?
AEDT runs from the first Sunday in October to the first Sunday in April. AEDT is one hour ahead of Australian Eastern Standard Time (AEST).
Which cities are in the ACST timezone?
Major cities in the ACST timezone include Adelaide, Darwin, Alice Springs, Mount Gambier.
What is the UTC offset for ACST?
Australian Central Standard Time (ACST) is at UTC+09:30. During daylight saving time, it shifts to ACDT.
What should I know about the ACST timezone?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
When is it midnight in AEDT, what time is it in ACST?
When it is 12:00 AM (midnight) in AEDT (AEDT), it is -1h 30m later in ACST (ACST).
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See every conversion from AEDT →·See every conversion from ACST →