What is CET in AST?
Atlantic Time is 5 hours behind
Central European Time is on UTC+2:00 and Atlantic Time is on UTC−3:00 right now. Both are on daylight saving, so their clocks read CEST and ADT. The gap changes during the year — see below.
- Time in Paris
- 5:47 am
- Time in Halifax
- 12:47 am
- Difference
- −5 h
- Next clock change
- October 25, 2026
Convert a time
ADT — Atlantic Time
12:00 am
Wed
When the difference changes
Central European Time and Atlantic Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:
- Now – October 25, 2026Atlantic Time is 5 hours behind
- October 25, 2026 – November 1, 2026Atlantic Time is 4 hours behind
- November 1, 2026 – March 14, 2027Atlantic Time is 5 hours behind
- March 14, 2027 – March 28, 2027Atlantic Time is 4 hours behind
- March 28, 2027 – onwardsAtlantic Time is 5 hours behind
Periods shorter than a day are not listed: both zones change at 2am in their own local time, so there are a few hours on each transition date when the gap is briefly something else.
Daylight saving
Central European Time
Clocks go back one hour at 2am local time, becoming CET.
Atlantic Time
Clocks go back one hour at 2am local time, becoming AST.
CET to AST conversion table
Every hour of Wednesday, September 23, 2026, converted from Central European Time to Atlantic Time. 5 of the 24 hours fall on a different calendar day in Halifax, which is marked.
- 12:00 am CEST
- 7:00 pm ADT−1 day
- 1:00 am CEST
- 8:00 pm ADT−1 day
- 2:00 am CEST
- 9:00 pm ADT−1 day
- 3:00 am CEST
- 10:00 pm ADT−1 day
- 4:00 am CEST
- 11:00 pm ADT−1 day
- 5:00 am CEST
- 12:00 am ADT
- 6:00 am CEST
- 1:00 am ADT
- 7:00 am CEST
- 2:00 am ADT
- 8:00 am CEST
- 3:00 am ADT
- 9:00 am CEST
- 4:00 am ADT
- 10:00 am CEST
- 5:00 am ADT
- 11:00 am CEST
- 6:00 am ADT
- 12:00 pm CEST
- 7:00 am ADT
- 1:00 pm CEST
- 8:00 am ADT
- 2:00 pm CEST
- 9:00 am ADT
- 3:00 pm CEST
- 10:00 am ADT
- 4:00 pm CEST
- 11:00 am ADT
- 5:00 pm CEST
- 12:00 pm ADT
- 6:00 pm CEST
- 1:00 pm ADT
- 7:00 pm CEST
- 2:00 pm ADT
- 8:00 pm CEST
- 3:00 pm ADT
- 9:00 pm CEST
- 4:00 pm ADT
- 10:00 pm CEST
- 5:00 pm ADT
- 11:00 pm CEST
- 6:00 pm ADT
Scheduling between the two
Working hours overlap from 2:00 pm to 6:00 pm CEST, which is 9:00 am to 1:00 pm ADT. Anything inside that window falls in the normal working day at both ends.
A note on AST: it can also mean Arabia Standard Time (UTC+3). This page means Atlantic Time.
Central European Time (CEST) is used in Berlin, Madrid, Rome, Amsterdam, Warsaw and Stockholm
Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico