ACST to Sydney
+0h 30mACST
ACSTSOURCESydney
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.
About Sydney
WikipediaSydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
Sydney is one of the first major cities to welcome the New Year.
Everything You Need to Know About ACST and Sydney Time
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts ACST 30 minutes ahead of Sydney — 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 Sydney. Midnight in ACST is 12:30 AM in Sydney. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to Sydney time conversion table
| ACST (ACST) | Sydney (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 Sydney time
- Scheduling a call from ACST to Sydney: a 10:00 AM start in ACST lands at 10:30 AM in Sydney, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both ACST and Sydney 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.
- Booking travel or deliveries: tracking Sydney local time against ACST keeps pickup windows and arrival estimates honest across the +0h 30m offset.
- 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 Sydney colleagues present.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Any meeting series spanning that date will shift by an hour in local time.
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 Sydney
Both ACST and Sydney 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 Sydney 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 Sydney (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
Sydney
❄ 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 Sydney?
ACST (ACST, UTC+09:30) is 30 minutes ahead of Sydney (AEST, UTC+10:00). The gap is currently +0h 30m.
How do I convert ACST time to Sydney time?
Add +0h 30m to ACST local time. For example, 9:00 AM in ACST is 9:30 AM in Sydney.
What time is it in Sydney right now?
Sydney 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 Sydney 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 Sydney?
ACST is 30 minutes ahead of Sydney. When it is 12:00 PM in ACST it is 12:30 PM in Sydney.
Do ACST and Sydney use different time zones?
ACST uses ACST at UTC+09:30, while Sydney (Australia) uses AEST at UTC+10:00. The IANA identifiers are Australia/Adelaide and Australia/Sydney.
Does daylight saving time affect the ACST–Sydney difference?
Neither zone observes daylight saving time, so the +0h 30m offset between ACST and Sydney 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 Sydney?
Not normally. The +0h 30m gap only pushes the date over for late-evening times.
What is the time difference between ACST and Sydney?
Sydney is +0h 30m from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is Sydney in?
Sydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
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 Sydney?
When it is 12:00 AM (midnight) in ACST (ACST), it is +0h 30m later in Sydney (AEST).
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