CET to AST Time Converter
AST is 5 hours behind CET. Continental western Europe is currently on CEST (UTC+2:00), and Atlantic Canada and the Caribbean are currently on ADT (UTC-3:00).
Best Time to Call Between CET and AST
Both zones are inside normal business hours between 2:00 PM and 5:00 PM CET — that's 9:00 AM to 12:00 PM AST. That's a 3-hour window.
both at work CET only AST only neither — hours along the strip are CET.
Common Times Converted
CET on the left, AST on the right.
CET to AST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| CET | AST | Working hours |
|---|---|---|
| 12:00 AM | 7:00 PM prev day | — |
| 1:00 AM | 8:00 PM prev day | — |
| 2:00 AM | 9:00 PM prev day | — |
| 3:00 AM | 10:00 PM prev day | — |
| 4:00 AM | 11:00 PM prev day | — |
| 5:00 AM | 12:00 AM | — |
| 6:00 AM | 1:00 AM | — |
| 7:00 AM | 2:00 AM | — |
| 8:00 AM | 3:00 AM | — |
| 9:00 AM | 4:00 AM | CET only |
| 10:00 AM | 5:00 AM | CET only |
| 11:00 AM | 6:00 AM | CET only |
| 12:00 PM | 7:00 AM | CET only |
| 1:00 PM | 8:00 AM | CET only |
| 2:00 PM | 9:00 AM | Both zones |
| 3:00 PM | 10:00 AM | Both zones |
| 4:00 PM | 11:00 AM | Both zones |
| 5:00 PM | 12:00 PM | AST only |
| 6:00 PM | 1:00 PM | AST only |
| 7:00 PM | 2:00 PM | AST only |
| 8:00 PM | 3:00 PM | AST only |
| 9:00 PM | 4:00 PM | AST only |
| 10:00 PM | 5:00 PM | — |
| 11:00 PM | 6:00 PM | — |
What CET and AST Actually Are
CET — Central European Time
Paris, Berlin, Madrid, Rome, Amsterdam, Vienna, Warsaw, Stockholm. Standing at UTC+1:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, October 25, 2026, to CET. Most of continental Europe moves to CEST (UTC+2) for the summer.
Central European Time spans a remarkable stretch of longitude — from Spain's Atlantic coast to Poland's eastern border — so solar noon in Madrid arrives nearly two hours later than in Warsaw.
AST — Atlantic Standard Time
Halifax, San Juan, Santo Domingo, Bermuda. Standing at UTC-4:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to AST. AST also stands for Arabia Standard Time (UTC+3), used in Saudi Arabia, Iraq and Kuwait.
Atlantic Standard Time is the only North American zone whose name is more commonly associated, worldwide, with a completely different zone — Arabia Standard Time.
What This Means in Practice
Both sides change clocks, on different dates
Both regions observe daylight saving but do not switch on the same day, so for a week or two each spring and fall the gap between them is an hour different from the rest of the year. Those short windows are where recurring invitations quietly break.
Major Cities in Each Zone
Cities on CET
Cities on AST
Frequently Asked Questions
What is the time difference between CET and AST?
AST is 5 hours behind CET.
What is 9:00 AM CET in AST?
9:00 AM CET is 4:00 AM AST.
What are the best hours to schedule a call between CET and AST?
Between 2:00 PM and 5:00 PM CET, which is 9:00 AM to 12:00 PM AST. Both sides are inside normal business hours through that window.
Does the difference between CET and AST change during the year?
Yes. Both regions observe daylight saving, and they do not switch on the same dates, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, October 25, 2026.
Does CET always mean Central European Time?
Most of continental Europe moves to CEST (UTC+2) for the summer.
Does AST always mean Atlantic Standard Time?
AST also stands for Arabia Standard Time (UTC+3), used in Saudi Arabia, Iraq and Kuwait.