ACST to CET
-8h 30mACST
ACSTSOURCECET
CETGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and CET on the World Map
The map below highlights the ACST (Australian Central Standard Time) and CET (Central European 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.
CET – Central European Time
UTC+01:00Central European Time (CET) is used across most of Western and Central Europe, 1 hour ahead of UTC.
- •CET covers more European countries than any other time zone.
- •Spain uses CET despite being geographically aligned with GMT/WET.
- •The Frankfurt Stock Exchange, Euronext (Amsterdam/Paris), and Borsa Italiana operate on CET.
- •Over 500 million people live in the CET time zone.
- •France moved to CET during the German occupation in WWII and never switched back.
ACST to CET Time Difference – Complete Guide
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. CET runs on Central European Time (CET) at UTC+01:00. That puts ACST 8 hours 30 minutes behind CET — a difference of -8h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 12:30 AM in CET. Midnight in ACST is 3:30 PM in CET. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to CET time conversion table
| ACST (ACST) | CET (CET) | Day |
|---|---|---|
| 12:00 AM | 3:30 PM | previous day |
| 6:00 AM | 9:30 PM | previous day |
| 7:00 AM | 10:30 PM | previous day |
| 8:00 AM | 11:30 PM | previous day |
| 9:00 AM | 12:30 AM | same day |
| 12:00 PM | 3:30 AM | same day |
| 3:00 PM | 6:30 AM | same day |
| 5:00 PM | 8:30 AM | same day |
| 6:00 PM | 9:30 AM | same day |
| 9:00 PM | 12:30 PM | same day |
Why people convert ACST to CET time
- Scheduling a call from ACST to CET: a 10:00 AM start in ACST lands at 1:30 AM in CET, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -8h 30m gap: ACST and CET have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in CET is 12:30 AM in ACST.
- Booking travel or deliveries: tracking CET local time against ACST keeps pickup windows and arrival estimates honest across the -8h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a -8h 30m gap is not.
- With a -8h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week ACST takes the early slot, the next week CET does.
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 CET (Central European Time)
Central European Time (CET) is the standard time zone for most of Europe, covering over 30 countries from Spain to Poland, and from Norway to Italy. CET is 1 hour ahead of GMT and is used by the European Union's most populous nations. During summer, most CET countries switch to Central European Summer Time (CEST, UTC+02:00). Major European financial markets in Frankfurt, Paris, and Amsterdam operate on CET.
Best time to call between ACST and CET
With a -8h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. CET opens at 9:00 AM CET, which is 12:30 AM in ACST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
ACST and CET have no shared working hours because of the -8h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
ACST is 8 hours 30 minutes behind CET (ACST UTC+09:30 → CET UTC+01:00). There is no shared 9-to-5 window, so plan around an early or late slot. 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
CET
☀ Currently in DST
Standard: UTC+01:00 · DST: UTC+02:00
Clocks fall back on Sun, Oct 25, 2026
⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.
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 CET?
ACST (ACST, UTC+09:30) is 8 hours 30 minutes behind CET (CET, UTC+01:00). The gap is currently -8h 30m.
How do I convert ACST time to CET time?
Add -8h 30m to ACST local time. For example, 9:00 AM in ACST is 12:30 AM in CET.
What time is it in CET right now?
CET uses CET at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -8h 30m offset from ACST.
What is the best time to call CET from ACST?
There is no shared working-hours window because of the -8h 30m gap. The closest option is 1:00 PM in ACST, which is 4:30 AM in CET.
Which is behind, ACST or CET?
ACST is 8 hours 30 minutes behind CET. When it is 12:00 PM in ACST it is 3:30 AM in CET.
Does daylight saving time affect the ACST–CET difference?
Neither zone observes daylight saving time, so the -8h 30m offset between ACST and CET 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 CET?
Not normally. The -8h 30m gap only pushes the date over the previous day.
What is the time difference between ACST and CET?
CET is -8h 30m from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is CET in?
CET 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 CET timezone?
Major cities in the CET timezone include Paris, Berlin, Rome, Madrid, Amsterdam, Brussels, Vienna, Warsaw.
What is the UTC offset for CET?
Central European Time (CET) is at UTC+01:00. During daylight saving time, it shifts to CEST.
What should I know about the CET timezone?
CET covers more European countries than any other time zone. Spain uses CET despite being geographically aligned with GMT/WET.
When is it midnight in ACST, what time is it in CET?
When it is 12:00 AM (midnight) in ACST (ACST), it is -8h 30m later in CET (CET).
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See every conversion from ACST →·See every conversion from CET →