Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

CET to ACST

+8h 30m

CET

CETSOURCE

UTC+02:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

ACST

UTC+09:30DST observed

HH08

MM30

20:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

CET

ACST

12:00 AM

7:30 AM

2:00 AM

9:30 AM

4:00 AM

11:30 AM

6:00 AM

1:30 PM

8:00 AM

3:30 PM

10:00 AM

5:30 PM

12:00 PM

7:30 PM

2:00 PM

9:30 PM

4:00 PM

11:30 PM

6:00 PM

1:30 AM+1

8:00 PM

3:30 AM+1

10:00 PM

5:30 AM+1

Green rows indicate typical business hours (9 AM - 5 PM)

CET and ACST on the World Map

The map below highlights the CET (Central European Time) and ACST (Australian Central Standard Time) timezone regions across the globe.

CET Zone

→

ACST Zone

Explore all world timezones interactively →

CET – Central European Time

UTC+01:00

Central European Time (CET) is used across most of Western and Central Europe, 1 hour ahead of UTC.

Countries in CET

GermanyFranceItalySpainNetherlandsBelgiumAustriaSwitzerlandPolandCzech RepublicSwedenNorwayDenmarkHungaryCroatiaSerbiaSlovakiaSloveniaBosnia and HerzegovinaNorth MacedoniaAlbaniaMontenegroLuxembourgMaltaTunisiaAlgeriaNigeria

Major Cities in CET

ParisBerlinRomeMadridAmsterdamBrusselsViennaWarsawZurichStockholmOsloCopenhagenPragueBudapestBarcelonaMunichMilanLagos

Key Facts about CET

•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.

Daylight Saving:Yes – switches to CEST

Learn more about CET on Wikipedia

ACST – Australian Central Standard Time

UTC+09:30

Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.

Countries in ACST

Australia (South Australia, Northern Territory)

Major Cities in ACST

AdelaideDarwinAlice SpringsMount Gambier

Key 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.
•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.

Daylight Saving:Yes – switches to ACDT

Learn more about ACST on Wikipedia

Everything You Need to Know About CET and ACST Time

CET runs on Central European Time (CET) at UTC+01:00. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts CET 8 hours 30 minutes ahead of ACST — a difference of +8h 30m at the current offsets.

In practice, when it is 9:00 AM in CET it is 5:30 PM in ACST. Midnight in CET is 8:30 AM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

CET to ACST time conversion table

CET (CET)	ACST (ACST)	Day
12:00 AM	8:30 AM	same day
6:00 AM	2:30 PM	same day
7:00 AM	3:30 PM	same day
8:00 AM	4:30 PM	same day
9:00 AM	5:30 PM	same day
12:00 PM	8:30 PM	same day
3:00 PM	11:30 PM	same day
5:00 PM	1:30 AM	next day
6:00 PM	2:30 AM	next day
9:00 PM	5:30 AM	next day

Why people convert CET to ACST time

Scheduling a call from CET to ACST: a 10:00 AM start in CET lands at 6:30 PM in ACST, so you can confirm the slot without doing the arithmetic yourself.
Handling a +8h 30m gap: CET and ACST 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 ACST is 5:30 PM in CET.
Watching a live event or market open: CET viewers need 5:30 PM in ACST to catch a 9:00 AM start there, and 3:30 PM if the event is anchored to CET.

Always state the zone abbreviation, not just the hour. "3:00 PM CET" 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 CET takes the early slot, the next week ACST does.

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 CET and ACST

With a +8h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. ACST opens at 9:00 AM ACST, which is 5:30 PM in CET, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

CET and ACST have no shared working hours because of the +8h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.

CET is 8 hours 30 minutes ahead of ACST (CET UTC+01:00 → ACST UTC+09:30). 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

CET

☀ 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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between CET and ACST?

CET (CET, UTC+01:00) is 8 hours 30 minutes ahead of ACST (ACST, UTC+09:30). The gap is currently +8h 30m.

How do I convert CET time to ACST time?

Add +8h 30m to CET local time. For example, 9:00 AM in CET is 5:30 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 +8h 30m offset from CET.