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DateAlmanac

What is WAT in AST?

Atlantic Time is 4 hours behind

West Africa Time is on UTC+1:00 and Atlantic Time is on UTC−3:00 right now. Atlantic Time is on daylight saving, so its clocks read ADT. The gap changes during the year — see below.

Time in Lagos
1:03:41 PM
Time in Halifax
9:03:41 AM
Difference
−4 h
Next clock change
November 1, 2026

Convert a time

ADT — Atlantic Time

9:00 am

ADT, Fri

When the difference changes

West Africa 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:

  1. Now – November 1, 2026Atlantic Time is 4 hours behind
  2. November 1, 2026 – March 14, 2027Atlantic Time is 5 hours behind
  3. March 14, 2027 – onwardsAtlantic Time is 4 hours behind

Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.

Daylight saving

West Africa Time

No clock changes

West Africa Time stays on WAT all year, so its offset from UTC never moves.

Atlantic Time

Sunday, November 1, 2026

Clocks go back one hour — 2:00 am becomes 1:00 am local time, and the zone is on AST after that.

WAT to AST conversion table

Every hour of Friday, September 25, 2026, converted from West Africa Time to Atlantic Time. 4 of the 24 hours fall on a different calendar day in Halifax, which is marked.

12:00 am WAT
8:00 pm ADT−1 day
1:00 am WAT
9:00 pm ADT−1 day
2:00 am WAT
10:00 pm ADT−1 day
3:00 am WAT
11:00 pm ADT−1 day
4:00 am WAT
12:00 am ADT
5:00 am WAT
1:00 am ADT
6:00 am WAT
2:00 am ADT
7:00 am WAT
3:00 am ADT
8:00 am WAT
4:00 am ADT
9:00 am WAT
5:00 am ADT
10:00 am WAT
6:00 am ADT
11:00 am WAT
7:00 am ADT
12:00 pm WAT
8:00 am ADT
1:00 pm WAT
9:00 am ADT
2:00 pm WAT
10:00 am ADT
3:00 pm WAT
11:00 am ADT
4:00 pm WAT
12:00 pm ADT
5:00 pm WAT
1:00 pm ADT
6:00 pm WAT
2:00 pm ADT
7:00 pm WAT
3:00 pm ADT
8:00 pm WAT
4:00 pm ADT
9:00 pm WAT
5:00 pm ADT
10:00 pm WAT
6:00 pm ADT
11:00 pm WAT
7:00 pm ADT

Scheduling between the two

Working hours overlap from 1:00 pm to 6:00 pm WAT, which is 9:00 am to 2:00 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.

West Africa Time (WAT) is used in Nigeria, Algeria, Angola and Cameroon

Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico

Other conversions