ACST to AEST
+0h 30mACST
ACSTSOURCEAEST
AESTGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and AEST on the World Map
The map below highlights the ACST (Australian Central Standard Time) and AEST (Australian Eastern Standard 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.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •Queensland does not observe daylight saving time, staying on AEST year-round.
- •Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
- •The Australian Securities Exchange (ASX) operates on AEST/AEDT.
- •AEST is 15 hours ahead of EST during winter.
ACST vs AEST: Offsets, DST and Best Call Times
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. AEST runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts ACST 30 minutes ahead of AEST — a difference of +0h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 9:30 AM in AEST. Midnight in ACST is 12:30 AM in AEST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to AEST time conversion table
| ACST (ACST) | AEST (AEST) | Day |
|---|---|---|
| 12:00 AM | 12:30 AM | same day |
| 6:00 AM | 6:30 AM | same day |
| 7:00 AM | 7:30 AM | same day |
| 8:00 AM | 8:30 AM | same day |
| 9:00 AM | 9:30 AM | same day |
| 12:00 PM | 12:30 PM | same day |
| 3:00 PM | 3:30 PM | same day |
| 5:00 PM | 5:30 PM | same day |
| 6:00 PM | 6:30 PM | same day |
| 9:00 PM | 9:30 PM | same day |
Why people convert ACST to AEST time
- Scheduling a call from ACST to AEST: a 10:00 AM start in ACST lands at 10:30 AM in AEST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both ACST and AEST are inside the 9-to-5 working day between 9:00 AM and 4:30 PM ACST time (9:30 AM–5:00 PM AEST). That is roughly 7 hours 30 minutes of usable overlap.
- Coordinating a ACST-based team with AEST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a +0h 30m gap is not.
- Block 9:00 AM–4:30 PM ACST as the recurring meeting window if you work primarily from ACST and need AEST 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 AEST (Australian Eastern Standard Time)
Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.
Best time to call between ACST and AEST
Both ACST and AEST sit inside the 9 AM – 5 PM working day between 9:00 AM–4:30 PM ACST, which is 9:30 AM–5:00 PM AEST. That gives roughly 7 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
ACST and AEST share 7 hours of working-hours overlap (9:00 AM–4:30 PM ACST), so scheduling a live meeting is straightforward.
ACST is 30 minutes ahead of AEST (ACST UTC+09:30 → AEST UTC+10:00). The shared working window is 9:00 AM–4:30 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
AEST
❄ 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 AEST?
ACST (ACST, UTC+09:30) is 30 minutes ahead of AEST (AEST, UTC+10:00). The gap is currently +0h 30m.
How do I convert ACST time to AEST time?
Add +0h 30m to ACST local time. For example, 9:00 AM in ACST is 9:30 AM in AEST.
What time is it in AEST right now?
AEST uses AEST at UTC+10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +0h 30m offset from ACST.
What is the best time to call AEST from ACST?
Call between 9:00 AM and 4:30 PM ACST — that maps to 9:30 AM–5:00 PM AEST and keeps both parties inside the working day.
Which is ahead, ACST or AEST?
ACST is 30 minutes ahead of AEST. When it is 12:00 PM in ACST it is 12:30 PM in AEST.
Does daylight saving time affect the ACST–AEST difference?
Neither zone observes daylight saving time, so the +0h 30m offset between ACST and AEST 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 AEST?
Not normally. The +0h 30m gap only pushes the date over for late-evening times.
What is the time difference between ACST and AEST?
AEST is +0h 30m from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is AEST in?
AEST 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 AEST timezone?
Major cities in the AEST timezone include Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
What is the UTC offset for AEST?
Australian Eastern Standard Time (AEST) is at UTC+10:00. During daylight saving time, it shifts to AEDT.
What should I know about the AEST timezone?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
When is it midnight in ACST, what time is it in AEST?
When it is 12:00 AM (midnight) in ACST (ACST), it is +0h 30m later in AEST (AEST).
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See every conversion from ACST →·See every conversion from AEST →