AST to CET
+5hAST
ASTSOURCECET
CETGreen rows indicate typical business hours (9 AM - 5 PM)
AST and CET on the World Map
The map below highlights the AST (Atlantic Standard Time) and CET (Central European Time) timezone regions across the globe.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •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.
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.
Understanding the +5h Gap: AST vs CET
AST runs on Atlantic Standard Time (AST) at UTC-04:00. CET runs on Central European Time (CET) at UTC+01:00. That puts AST 5 hours ahead of CET — a difference of +5h at the current offsets.
In practice, when it is 9:00 AM in AST it is 2:00 PM in CET. Midnight in AST is 5:00 AM in CET. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to CET time conversion table
| AST (AST) | CET (CET) | Day |
|---|---|---|
| 12:00 AM | 5:00 AM | same day |
| 6:00 AM | 11:00 AM | same day |
| 7:00 AM | 12:00 PM | same day |
| 8:00 AM | 1:00 PM | same day |
| 9:00 AM | 2:00 PM | same day |
| 12:00 PM | 5:00 PM | same day |
| 3:00 PM | 8:00 PM | same day |
| 5:00 PM | 10:00 PM | same day |
| 6:00 PM | 11:00 PM | same day |
| 9:00 PM | 2:00 AM | next day |
Why people convert AST to CET time
- Scheduling a call from AST to CET: a 10:00 AM start in AST lands at 3:00 PM in CET, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and CET are inside the 9-to-5 working day between 9:00 AM and 12:00 PM AST time (2:00 PM–5:00 PM CET). That is roughly 3 hours of usable overlap.
- Watching a live event or market open: AST viewers need 2:00 PM in CET to catch a 9:00 AM start there, and 7:00 PM if the event is anchored to AST.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +5h gap is not.
- Block 9:00 AM–12:00 PM AST as the recurring meeting window if you work primarily from AST and need CET colleagues present.
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.
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 AST and CET
Both AST and CET sit inside the 9 AM – 5 PM working day between 9:00 AM–12:00 PM AST, which is 2:00 PM–5:00 PM CET. That gives roughly 3 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and CET overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
AST is 5 hours ahead of CET (AST UTC-04:00 → CET UTC+01:00). The shared working window is 9:00 AM–12:00 PM AST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
CET
☀ Currently in DST
Standard: UTC+01:00 · DST: UTC+02:00
Clocks fall back on Sun, Oct 25, 2026
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 AST and CET?
AST (AST, UTC-04:00) is 5 hours ahead of CET (CET, UTC+01:00). The gap is currently +5h.
How do I convert AST time to CET time?
Add +5h to AST local time. For example, 9:00 AM in AST is 2:00 PM 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 +5h offset from AST.
What is the best time to call CET from AST?
Call between 9:00 AM and 12:00 PM AST — that maps to 2:00 PM–5:00 PM CET and keeps both parties inside the working day.
Which is ahead, AST or CET?
AST is 5 hours ahead of CET. When it is 12:00 PM in AST it is 5:00 PM in CET.
Does daylight saving time affect the AST–CET difference?
Neither zone observes daylight saving time, so the +5h offset between AST and CET is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and CET?
Not normally. The +5h gap only pushes the date over for late-evening times.
What is the time difference between AST and CET?
CET is +5h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is CET in?
CET operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
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 AST, what time is it in CET?
When it is 12:00 AM (midnight) in AST (AST), it is +5h later in CET (CET).
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See every conversion from AST →·See every conversion from CET →