CET to AST
On Oct 23, 2026, Atlantic Time is 5 hours behind Central European Time: 9:00 AM CEST is 4:00 AM ADT. The gap changes during the year because of daylight saving time; the dates are below.
AST vs CET over the next 12 months
| Period | AST is | Example |
|---|---|---|
| Oct 23, 2026 to Oct 25, 2026 | 5 hours behind | 9:00 AM CEST = 4:00 AM ADT |
| Oct 25, 2026 to Nov 1, 2026 | 4 hours behind | 9:00 AM CET = 5:00 AM ADT |
| Nov 1, 2026 to Mar 14, 2027 | 5 hours behind | 9:00 AM CET = 4:00 AM AST |
| Mar 14, 2027 to Mar 28, 2027 | 4 hours behind | 9:00 AM CET = 5:00 AM ADT |
| Mar 28, 2027 onwards | 5 hours behind | 9:00 AM CEST = 4:00 AM ADT |
CET to AST conversion table
Every hour of a weekday around Oct 23, 2026, in both zones.
| Central European Time | Atlantic Time |
|---|---|
| 12:00 AM | 8:00 PM (previous day) |
| 1:00 AM | 9:00 PM (previous day) |
| 2:00 AM | 10:00 PM (previous day) |
| 3:00 AM | 11:00 PM (previous day) |
| 4:00 AM | 12:00 AM |
| 5:00 AM | 1:00 AM |
| 6:00 AM | 2:00 AM |
| 7:00 AM | 3:00 AM |
| 8:00 AM | 4:00 AM |
| 9:00 AM | 5:00 AM |
| 10:00 AM | 6:00 AM |
| 11:00 AM | 7:00 AM |
| 12:00 PM | 8:00 AM |
| 1:00 PM | 9:00 AM |
| 2:00 PM | 10:00 AM |
| 3:00 PM | 11:00 AM |
| 4:00 PM | 12:00 PM |
| 5:00 PM | 1:00 PM |
| 6:00 PM | 2:00 PM |
| 7:00 PM | 3:00 PM |
| 8:00 PM | 4:00 PM |
| 9:00 PM | 5:00 PM |
| 10:00 PM | 6:00 PM |
| 11:00 PM | 7:00 PM |
Best time for a meeting
Normal 9-to-5 working hours overlap for 4 hours on a weekday: 1:00 PM–5:00 PM CET, which is 9:00 AM–1:00 PM ADT.
Comparing more than two places? The meeting planner lines up working hours for up to six cities.
Daylight saving time
Central European Time (CET/CEST)
- Oct 25, 2026: clocks go back 1 hour at 3:00 AM (UTC+2 → UTC+1)
- Mar 28, 2027: clocks go forward 1 hour at 2:00 AM (UTC+1 → UTC+2)
Atlantic Time (AST/ADT)
- Nov 1, 2026: clocks go back 1 hour at 2:00 AM (UTC−3 → UTC−4)
- Mar 14, 2027: clocks go forward 1 hour at 2:00 AM (UTC−4 → UTC−3)
Where these clocks are used
- Central European Time (CET/CEST): Paris, Berlin, Madrid, Rome, Amsterdam, Stockholm. IANA zone
Europe/Paris. - Atlantic Time (AST/ADT): Nova Scotia, New Brunswick, Prince Edward Island. IANA zone
America/Halifax.
Questions
What time is it in AST when it is 9 AM CET?
On Oct 23, 2026, 9:00 AM CEST is 4:00 AM ADT. On other dates the answer can shift by an hour because of daylight saving time; the table of periods on this page gives each one.
How many hours behind CET is AST?
It depends on the date. Oct 23, 2026 to Oct 25, 2026: AST is 5 hours behind. Oct 25, 2026 to Nov 1, 2026: AST is 4 hours behind. Nov 1, 2026 to Mar 14, 2027: AST is 5 hours behind. Mar 14, 2027 to Mar 28, 2027: AST is 4 hours behind. Mar 28, 2027 onwards: AST is 5 hours behind.
Do CET and AST observe daylight saving time?
Central European Time switches to CEST (UTC+2) in summer and back to CET (UTC+1) in winter. Atlantic Time switches to ADT (UTC−3) in summer and back to AST (UTC−4) in winter.
What is the best time for a meeting between CET and AST?
Normal 9-to-5 working hours overlap for 4 hours on a weekday: 1:00 PM–5:00 PM CET, which is 9:00 AM–1:00 PM ADT.
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Related conversions
- AST to CET (reverse)
- CET to EST
- CET to CST
- CET to MST
- CET to PST
- CET to UTC
- CET to GMT
- CET to IST
- CET to SGT
- CET to JST
- CET to AEST
- CET to AKST
- All time zones
Computed from the IANA time zone database on Oct 23, 2026. Live clocks and the converter use your browser's copy of the same data.