Инструменты Intosoft

CET to AST

-5h

CET

CETSOURCE
UTC+02:00☀ DST active
HH12
:
MM00
  
12:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM

AST

AST
UTC-03:00☀ DST active
HH07
:
MM00
  
07:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM
CET
AST
12:00 AM
7:00 PM-1
2:00 AM
9:00 PM-1
4:00 AM
11:00 PM-1
6:00 AM
1:00 AM
8:00 AM
3:00 AM
10:00 AM
5:00 AM
12:00 PM
7:00 AM
2:00 PM
9:00 AM
4:00 PM
11:00 AM
6:00 PM
1:00 PM
8:00 PM
3:00 PM
10:00 PM
5:00 PM

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

CET and AST on the World Map

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

CETASTParisBerlinRomeMadridHalifaxSan JuanSanto DomingoCaracas
CET Zone
→
AST 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

AST – Atlantic Standard Time

UTC-04:00

Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.

Countries in AST
Canada (Atlantic provinces)Puerto RicoUS Virgin IslandsDominican RepublicVenezuelaBoliviaBarbadosTrinidad and Tobago
Major Cities in AST
HalifaxSan JuanSanto DomingoCaracasLa PazFrederictonCharlottetown
Key Facts about AST
  • •Puerto Rico uses AST year-round and does not observe DST.
  • •AST is 1 hour ahead of EST.
  • •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
Daylight Saving:Yes – switches to ADT
Learn more about AST on Wikipedia

CET vs AST: Offsets, DST and Best Call Times

CET runs on Central European Time (CET) at UTC+01:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts CET 5 hours behind AST — a difference of -5h at the current offsets.

In practice, when it is 9:00 AM in CET it is 4:00 AM in AST. Midnight in CET is 7:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

CET to AST time conversion table

CET (CET)AST (AST)Day
12:00 AM7:00 PMprevious day
6:00 AM1:00 AMsame day
7:00 AM2:00 AMsame day
8:00 AM3:00 AMsame day
9:00 AM4:00 AMsame day
12:00 PM7:00 AMsame day
3:00 PM10:00 AMsame day
5:00 PM12:00 PMsame day
6:00 PM1:00 PMsame day
9:00 PM4:00 PMsame day

Why people convert CET to AST time

  • Scheduling a call from CET to AST: a 10:00 AM start in CET lands at 5:00 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
  • Finding shared working hours: both CET and AST are inside the 9-to-5 working day between 2:00 PM and 5:00 PM CET time (9:00 AM–12:00 PM AST). That is roughly 3 hours of usable overlap.
  • Booking travel or deliveries: tracking AST local time against CET keeps pickup windows and arrival estimates honest across the -5h offset.
  • Always state the zone abbreviation, not just the hour. "3:00 PM CET" is unambiguous; "3 PM" across a -5h gap is not.
  • Block 2:00 PM–5:00 PM CET as the recurring meeting window if you work primarily from CET and need AST colleagues present.

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 AST (Atlantic Standard Time)

Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.

Best time to call between CET and AST

Both CET and AST sit inside the 9 AM – 5 PM working day between 2:00 PM–5:00 PM CET, which is 9:00 AM–12:00 PM AST. That gives roughly 3 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

CET and AST overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.

CET is 5 hours behind AST (CET UTC+01:00 → AST UTC-04:00). The shared working window is 2:00 PM–5:00 PM CET. 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

AST

☀ Currently in DST

Standard: UTC-04:00 · DST: UTC-03:00

Clocks fall back on Sun, Nov 1, 2026

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 AST?

CET (CET, UTC+01:00) is 5 hours behind AST (AST, UTC-04:00). The gap is currently -5h.

How do I convert CET time to AST time?

Add -5h to CET local time. For example, 9:00 AM in CET is 4:00 AM in AST.

What time is it in AST right now?

AST uses AST at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -5h offset from CET.

What is the best time to call AST from CET?

Call between 2:00 PM and 5:00 PM CET — that maps to 9:00 AM–12:00 PM AST and keeps both parties inside the working day.

Which is behind, CET or AST?

CET is 5 hours behind AST. When it is 12:00 PM in CET it is 7:00 AM in AST.

Does daylight saving time affect the CET–AST difference?

Neither zone observes daylight saving time, so the -5h offset between CET and AST is fixed all year.

Which other cities share CET's time zone?

CET also covers Paris, Berlin, Rome, Madrid, Amsterdam, Brussels, Vienna, Warsaw and 10 more.

Which countries use CET, CET's zone?

CET is used in Germany, France, Italy, Spain, Netherlands, Belgium, Austria, Switzerland and 19 more.

Is there a day difference between CET and AST?

Not normally. The -5h gap only pushes the date over the previous day.

What is the time difference between CET and AST?

AST is -5h from CET.

What timezone is CET in?

CET operates on its local timezone.

What timezone is AST in?

AST operates on its local timezone.

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 AST timezone?

Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.

What is the UTC offset for AST?

Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.

What should I know about the AST timezone?

Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.

When is it midnight in CET, what time is it in AST?

When it is 12:00 AM (midnight) in CET (CET), it is -5h later in AST (AST).

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