ACST to AWST
-1h 30mACST
ACSTSOURCEAWST
AWSTGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and AWST on the World Map
The map below highlights the ACST (Australian Central Standard Time) and AWST (Australian Western 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.
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.
Time Conversion Guide: ACST to AWST
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. AWST runs on Australian Western Standard Time (AWST) at UTC+08:00. That puts ACST 1 hour 30 minutes behind AWST — a difference of -1h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 7:30 AM in AWST. Midnight in ACST is 10:30 PM in AWST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to AWST time conversion table
| ACST (ACST) | AWST (AWST) | 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 ACST to AWST time
- Scheduling a call from ACST to AWST: a 10:00 AM start in ACST lands at 8:30 AM in AWST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both ACST and AWST are inside the 9-to-5 working day between 10:30 AM and 5:00 PM ACST time (9:00 AM–3:30 PM AWST). That is roughly 6 hours 30 minutes of usable overlap.
- Booking travel or deliveries: tracking AWST 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 10:30 AM–5:00 PM ACST as the recurring meeting window if you work primarily from ACST and need AWST 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 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.
Best time to call between ACST and AWST
Both ACST and AWST sit inside the 9 AM – 5 PM working day between 10:30 AM–5:00 PM ACST, which is 9:00 AM–3:30 PM AWST. 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 AWST share 6 hours of working-hours overlap (10:30 AM–5:00 PM ACST), so scheduling a live meeting is straightforward.
ACST is 1 hour 30 minutes behind AWST (ACST UTC+09:30 → AWST UTC+08:00). The shared working window is 10:30 AM–5:00 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
AWST
Does not observe DST
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 AWST?
ACST (ACST, UTC+09:30) is 1 hour 30 minutes behind AWST (AWST, UTC+08:00). The gap is currently -1h 30m.
How do I convert ACST time to AWST time?
Add -1h 30m to ACST local time. For example, 9:00 AM in ACST is 7:30 AM in AWST.
What time is it in AWST right now?
AWST uses AWST at UTC+08:00. 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 AWST from ACST?
Call between 10:30 AM and 5:00 PM ACST — that maps to 9:00 AM–3:30 PM AWST and keeps both parties inside the working day.
Which is behind, ACST or AWST?
ACST is 1 hour 30 minutes behind AWST. When it is 12:00 PM in ACST it is 10:30 AM in AWST.
Does daylight saving time affect the ACST–AWST difference?
Neither zone observes daylight saving time, so the -1h 30m offset between ACST and AWST 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 AWST?
Not normally. The -1h 30m gap only pushes the date over the previous day.
What is the time difference between ACST and AWST?
AWST is -1h 30m from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is AWST in?
AWST 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 AWST timezone?
Major cities in the AWST timezone include Perth, Mandurah, Bunbury, Geraldton.
What is the UTC offset for AWST?
Australian Western Standard Time (AWST) is at UTC+08:00.
What should I know about the AWST timezone?
Western Australia does not observe daylight saving time. Perth is the most isolated major city in the world.
When is it midnight in ACST, what time is it in AWST?
When it is 12:00 AM (midnight) in ACST (ACST), it is -1h 30m later in AWST (AWST).
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See every conversion from ACST →·See every conversion from AWST →