Vienna to ACST
+7h 30mVienna
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 Time) and ACST (Australian Central Standard Time) timezone regions across the globe.
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 – 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.
About Vienna
WikipediaVienna operates on Central European Time (CET/CEST). As a major EU hub and headquarters for international organizations, Vienna coordinates Central European business.
Vienna has more than 50 theaters and opera houses.
Time Conversion Guide: Vienna to ACST
Vienna runs on Central European Summer Time (CEST) at UTC+02:00, currently observing daylight saving time. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts Vienna 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 Vienna it is 4:30 PM in ACST. Midnight in Vienna is 7:30 AM in ACST.Vienna observes daylight saving time while ACST does not, so the gap narrows or widens by an hour part of the year.
Vienna to ACST time conversion table
| Vienna (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 Vienna to ACST time
- Scheduling a call from Vienna to ACST: a 10:00 AM start in Vienna lands at 5:30 PM in ACST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Vienna 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: Vienna 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 Vienna.
- 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 Vienna and need ACST colleagues present.
- Vienna: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +7h 30m gap.
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.
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 Vienna and ACST
Both Vienna 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
Vienna and ACST overlap for only 30 minutes (9:00 AM–9:30 AM CEST), so meetings have to be booked precisely.
Vienna 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
Vienna
☀ 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 Vienna and ACST?
Vienna (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 Vienna time to ACST time?
Add +7h 30m to Vienna local time. For example, 9:00 AM in Vienna 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 Vienna.
What is the best time to call ACST from Vienna?
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, Vienna or ACST?
Vienna is 7 hours 30 minutes ahead of ACST. When it is 12:00 PM in Vienna it is 7:30 PM in ACST.
Do Vienna and ACST use different time zones?
Vienna (Austria) uses CEST at UTC+02:00, while ACST uses ACST at UTC+09:30. The IANA identifiers are Europe/Vienna and Australia/Adelaide.
Does daylight saving time affect the Vienna–ACST difference?
Yes at the moment: Vienna is on daylight saving time and ACST is not, so the +7h 30m gap shifts by an hour when exactly one of them changes clocks.
Which other cities share Vienna's time zone?
CEST also covers Paris, Berlin, Rome, Madrid, Amsterdam, Brussels, Vienna, Warsaw and 10 more.
Which countries use CEST, Vienna's zone?
CEST is used in Germany, France, Italy, Spain, Netherlands, Belgium, Austria, Switzerland and 19 more.
Is there a day difference between Vienna and ACST?
Not normally. The +7h 30m gap only pushes the date over for late-evening times.
What is the time difference between Vienna and ACST?
ACST is +7h 30m from Vienna.
What timezone is Vienna in?
Vienna operates on Central European Time (CET/CEST). As a major EU hub and headquarters for international organizations, Vienna coordinates Central European business.
What timezone is ACST in?
ACST operates on its local timezone.
What are the business hours in Vienna?
Standard business hours in Vienna are 8:00 AM - 5:00 PM CET.
Which countries use CET (Central European Time)?
CET is used in Germany, France, Italy, Spain, Netherlands, Belgium, and 21 more countries.
Does CET observe daylight saving time?
Yes, CET switches to CEST during summer months.
What are some interesting facts about CET?
CET covers more European countries than any other time zone. Spain uses CET despite being geographically aligned with GMT/WET.
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 Vienna, what time is it in ACST?
When it is 12:00 AM (midnight) in Vienna (CET), it is +7h 30m later in ACST (ACST).
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