ACST to AEDT
+1h 30mACST
ACSTSOURCEAEDT
AEDTGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and AEDT on the World Map
The map below highlights the ACST (Australian Central Standard Time) and AEDT (Australian Eastern Daylight Time) timezone regions across the globe.
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.
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.
Everything You Need to Know About ACST and AEDT Time
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. AEDT runs on Australian Eastern Daylight Time (AEDT) at UTC+11:00. That puts ACST 1 hour 30 minutes ahead of AEDT — a difference of +1h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 10:30 AM in AEDT. Midnight in ACST is 1:30 AM in AEDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to AEDT time conversion table
| ACST (ACST) | AEDT (AEDT) | Day |
|---|---|---|
| 12:00 AM | 1:30 AM | same day |
| 6:00 AM | 7:30 AM | same day |
| 7:00 AM | 8:30 AM | same day |
| 8:00 AM | 9:30 AM | same day |
| 9:00 AM | 10:30 AM | same day |
| 12:00 PM | 1:30 PM | same day |
| 3:00 PM | 4:30 PM | same day |
| 5:00 PM | 6:30 PM | same day |
| 6:00 PM | 7:30 PM | same day |
| 9:00 PM | 10:30 PM | same day |
Why people convert ACST to AEDT time
- Scheduling a call from ACST to AEDT: a 10:00 AM start in ACST lands at 11:30 AM in AEDT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both ACST and AEDT are inside the 9-to-5 working day between 9:00 AM and 3:30 PM ACST time (10:30 AM–5:00 PM AEDT). That is roughly 6 hours 30 minutes of usable overlap.
- Booking travel or deliveries: tracking AEDT local time against ACST keeps pickup windows and arrival estimates honest across the +1h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a +1h 30m gap is not.
- Block 9:00 AM–3:30 PM ACST as the recurring meeting window if you work primarily from ACST and need AEDT colleagues present.
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.
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.
Best time to call between ACST and AEDT
Both ACST and AEDT sit inside the 9 AM – 5 PM working day between 9:00 AM–3:30 PM ACST, which is 10:30 AM–5:00 PM AEDT. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
ACST and AEDT share 6 hours of working-hours overlap (9:00 AM–3:30 PM ACST), so scheduling a live meeting is straightforward.
ACST is 1 hour 30 minutes ahead of AEDT (ACST UTC+09:30 → AEDT UTC+11:00). The shared working window is 9:00 AM–3:30 PM ACST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 2026
AEDT
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
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 ACST and AEDT?
ACST (ACST, UTC+09:30) is 1 hour 30 minutes ahead of AEDT (AEDT, UTC+11:00). The gap is currently +1h 30m.
How do I convert ACST time to AEDT time?
Add +1h 30m to ACST local time. For example, 9:00 AM in ACST is 10:30 AM in AEDT.
What time is it in AEDT right now?
AEDT uses AEDT at UTC+11:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +1h 30m offset from ACST.
What is the best time to call AEDT from ACST?
Call between 9:00 AM and 3:30 PM ACST — that maps to 10:30 AM–5:00 PM AEDT and keeps both parties inside the working day.
Which is ahead, ACST or AEDT?
ACST is 1 hour 30 minutes ahead of AEDT. When it is 12:00 PM in ACST it is 1:30 PM in AEDT.
Does daylight saving time affect the ACST–AEDT difference?
Neither zone observes daylight saving time, so the +1h 30m offset between ACST and AEDT is fixed all year.
Which other cities share ACST's time zone?
ACST also covers Adelaide, Darwin, Alice Springs, Mount Gambier.
Which countries use ACST, ACST's zone?
ACST is used in Australia (South Australia, Northern Territory).
Is there a day difference between ACST and AEDT?
Not normally. The +1h 30m gap only pushes the date over for late-evening times.
What is the time difference between ACST and AEDT?
AEDT is +1h 30m from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is AEDT in?
AEDT operates on its local timezone.
Which countries use ACST (Australian Central Standard Time)?
ACST is used in Australia (South Australia, Northern Territory).
Does ACST observe daylight saving time?
Yes, ACST switches to ACDT during summer months.
What are some interesting facts about ACST?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
Which cities are in the AEDT timezone?
Major cities in the AEDT timezone include Sydney, Melbourne, Canberra, Hobart, Newcastle.
What is the UTC offset for AEDT?
Australian Eastern Daylight Time (AEDT) is at UTC+11:00. During daylight saving time, it shifts to AEDT.
What should I know about the AEDT timezone?
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).
When is it midnight in ACST, what time is it in AEDT?
When it is 12:00 AM (midnight) in ACST (ACST), it is +1h 30m later in AEDT (AEDT).
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See every conversion from ACST →·See every conversion from AEDT →