AWST to ACST
+1h 30mAWST
AWSTSOURCEACST
ACSTGreen rows indicate typical business hours (9 AM - 5 PM)
AWST and ACST on the World Map
The map below highlights the AWST (Australian Western Standard Time) and ACST (Australian Central Standard Time) timezone regions across the globe.
AWST – Australian Western Standard Time
UTC+08:00Australian Western Standard Time (AWST) is the time zone for Western Australia, 8 hours ahead of UTC.
- •Western Australia does not observe daylight saving time.
- •Perth is the most isolated major city in the world.
- •AWST is the same offset as China Standard Time and Singapore Time.
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.
Time Conversion Guide: AWST to ACST
AWST runs on Australian Western Standard Time (AWST) at UTC+08:00. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts AWST 1 hour 30 minutes ahead of ACST — a difference of +1h 30m at the current offsets.
In practice, when it is 9:00 AM in AWST it is 10:30 AM in ACST. Midnight in AWST is 1:30 AM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AWST to ACST time conversion table
| AWST (AWST) | ACST (ACST) | 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 AWST to ACST time
- Scheduling a call from AWST to ACST: a 10:00 AM start in AWST lands at 11:30 AM in ACST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AWST and ACST are inside the 9-to-5 working day between 9:00 AM and 3:30 PM AWST time (10:30 AM–5:00 PM ACST). That is roughly 6 hours 30 minutes of usable overlap.
- Coordinating a AWST-based team with ACST 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 AWST" is unambiguous; "3 PM" across a +1h 30m gap is not.
- Block 9:00 AM–3:30 PM AWST as the recurring meeting window if you work primarily from AWST and need ACST colleagues present.
About AWST (Australian Western Standard Time)
Australian Western Standard Time (AWST) is used in Western Australia. WA does not observe daylight saving time, having rejected it in multiple referendums. Perth is the most remote major city in the world.
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 AWST and ACST
Both AWST and ACST sit inside the 9 AM – 5 PM working day between 9:00 AM–3:30 PM AWST, which is 10:30 AM–5:00 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
AWST and ACST share 6 hours of working-hours overlap (9:00 AM–3:30 PM AWST), so scheduling a live meeting is straightforward.
AWST is 1 hour 30 minutes ahead of ACST (AWST UTC+08:00 → ACST UTC+09:30). The shared working window is 9:00 AM–3:30 PM AWST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AWST
Does not observe DST
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 AWST and ACST?
AWST (AWST, UTC+08:00) is 1 hour 30 minutes ahead of ACST (ACST, UTC+09:30). The gap is currently +1h 30m.
How do I convert AWST time to ACST time?
Add +1h 30m to AWST local time. For example, 9:00 AM in AWST is 10:30 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 AWST.
What is the best time to call ACST from AWST?
Call between 9:00 AM and 3:30 PM AWST — that maps to 10:30 AM–5:00 PM ACST and keeps both parties inside the working day.
Which is ahead, AWST or ACST?
AWST is 1 hour 30 minutes ahead of ACST. When it is 12:00 PM in AWST it is 1:30 PM in ACST.
Does daylight saving time affect the AWST–ACST difference?
Neither zone observes daylight saving time, so the +1h 30m offset between AWST and ACST is fixed all year.
Which other cities share AWST's time zone?
AWST also covers Perth, Mandurah, Bunbury, Geraldton.
Which countries use AWST, AWST's zone?
AWST is used in Australia (Western Australia).
Is there a day difference between AWST and ACST?
Not normally. The +1h 30m gap only pushes the date over for late-evening times.
What is the time difference between AWST and ACST?
ACST is +1h 30m from AWST.
What timezone is AWST in?
AWST operates on its local timezone.
What timezone is ACST in?
ACST operates on its local timezone.
Which countries use AWST (Australian Western Standard Time)?
AWST is used in Australia (Western Australia).
Does AWST observe daylight saving time?
No, AWST does not observe daylight saving time and remains at UTC+08:00 year-round.
What are some interesting facts about AWST?
Western Australia does not observe daylight saving time. Perth is the most isolated major city in the world.
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 AWST, what time is it in ACST?
When it is 12:00 AM (midnight) in AWST (AWST), it is +1h 30m later in ACST (ACST).
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See every conversion from AWST →·See every conversion from ACST →