CEST to ACST
+7h 30mCEST
CESTSOURCEACST
ACSTGreen rows indicate typical business hours (9 AM - 5 PM)
CEST and ACST on the World Map
The map below highlights the CEST (Central European Summer Time) and ACST (Australian Central Standard Time) timezone regions across the globe.
CEST – Central European Summer Time
UTC+02:00Central European Summer Time (CEST) is the daylight saving time in Central Europe, 2 hours ahead of UTC.
- •CEST runs from the last Sunday of March to the last Sunday of October.
- •The EU has voted to abolish clock changes but implementation has been delayed.
- •CEST shares the same offset as EET (UTC+02:00).
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: CEST to ACST
CEST runs on Central European Summer Time (CEST) at UTC+02:00. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts CEST 7 hours 30 minutes ahead of ACST — a difference of +7h 30m at the current offsets.
In practice, when it is 9:00 AM in CEST it is 4:30 PM in ACST. Midnight in CEST is 7:30 AM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
CEST to ACST time conversion table
| CEST (CEST) | ACST (ACST) | Day |
|---|---|---|
| 12:00 AM | 7:30 AM | same day |
| 6:00 AM | 1:30 PM | same day |
| 7:00 AM | 2:30 PM | same day |
| 8:00 AM | 3:30 PM | same day |
| 9:00 AM | 4:30 PM | same day |
| 12:00 PM | 7:30 PM | same day |
| 3:00 PM | 10:30 PM | same day |
| 5:00 PM | 12:30 AM | next day |
| 6:00 PM | 1:30 AM | next day |
| 9:00 PM | 4:30 AM | next day |
Why people convert CEST to ACST time
- Scheduling a call from CEST to ACST: a 10:00 AM start in CEST lands at 5:30 PM in ACST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both CEST and ACST are inside the 9-to-5 working day between 9:00 AM and 9:30 AM CEST time (4:30 PM–5:00 PM ACST). That is roughly 0 hours 30 minutes of usable overlap.
- Watching a live event or market open: CEST viewers need 4:30 PM in ACST to catch a 9:00 AM start there, and 4:30 PM if the event is anchored to CEST.
- Always state the zone abbreviation, not just the hour. "3:00 PM CEST" is unambiguous; "3 PM" across a +7h 30m gap is not.
- Block 9:00 AM–9:30 AM CEST as the recurring meeting window if you work primarily from CEST and need ACST colleagues present.
About CEST (Central European Summer Time)
Central European Summer Time (CEST) is observed from the last Sunday of March to the last Sunday of October across most of Europe. During CEST, clocks are 2 hours ahead of UTC. The EU has debated abolishing seasonal clock changes since 2019.
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 CEST and ACST
Both CEST and ACST sit inside the 9 AM – 5 PM working day between 9:00 AM–9:30 AM CEST, which is 4:30 PM–5:00 PM ACST. That gives roughly 0 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
CEST and ACST overlap for only 30 minutes (9:00 AM–9:30 AM CEST), so meetings have to be booked precisely.
CEST is 7 hours 30 minutes ahead of ACST (CEST UTC+02:00 → ACST UTC+09:30). The shared working window is 9:00 AM–9:30 AM CEST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
CEST
☀ Currently in DST
Standard: UTC+01:00 · DST: UTC+02:00
Clocks fall back on Sun, Oct 25, 2026
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 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 CEST and ACST?
CEST (CEST, UTC+02:00) is 7 hours 30 minutes ahead of ACST (ACST, UTC+09:30). The gap is currently +7h 30m.
How do I convert CEST time to ACST time?
Add +7h 30m to CEST local time. For example, 9:00 AM in CEST is 4:30 PM 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 +7h 30m offset from CEST.
What is the best time to call ACST from CEST?
Call between 9:00 AM and 9:30 AM CEST — that maps to 4:30 PM–5:00 PM ACST and keeps both parties inside the working day.
Which is ahead, CEST or ACST?
CEST is 7 hours 30 minutes ahead of ACST. When it is 12:00 PM in CEST it is 7:30 PM in ACST.
Does daylight saving time affect the CEST–ACST difference?
Neither zone observes daylight saving time, so the +7h 30m offset between CEST and ACST is fixed all year.
Which other cities share CEST's time zone?
CEST also covers Paris, Berlin, Rome, Madrid, Amsterdam, Vienna, Stockholm.
Which countries use CEST, CEST's zone?
CEST is used in Germany, France, Italy, Spain, Netherlands, Belgium, Austria, Switzerland and 3 more.
Is there a day difference between CEST and ACST?
Not normally. The +7h 30m gap only pushes the date over for late-evening times.
What is the time difference between CEST and ACST?
ACST is +7h 30m from CEST.
What timezone is CEST in?
CEST operates on its local timezone.
What timezone is ACST in?
ACST operates on its local timezone.
Which countries use CEST (Central European Summer Time)?
CEST is used in Germany, France, Italy, Spain, Netherlands, Belgium, and 5 more countries.
Does CEST observe daylight saving time?
Yes, CEST switches to CET during summer months.
What are some interesting facts about CEST?
CEST runs from the last Sunday of March to the last Sunday of October. The EU has voted to abolish clock changes but implementation has been delayed.
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 CEST, what time is it in ACST?
When it is 12:00 AM (midnight) in CEST (CEST), it is +7h 30m later in ACST (ACST).
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See every conversion from CEST →·See every conversion from ACST →