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DateAlmanac

What is ART in AST?

Atlantic Time is 1 hour behind

Argentina Time is on UTC−3:00 and Atlantic Time is on UTC−4:00 right now. The gap changes during the year — see below.

Convert a time

AST — Atlantic Time

6:00 am

AST, Fri

Time in Buenos Aires
7:00:46 AM
Time in Halifax
6:00:46 AM
Difference
−1 h
Next clock change
March 14, 2027

When the difference changes

Argentina 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 – March 14, 2027Atlantic Time is 1 hour behind
  2. March 14, 2027 – November 7, 2027Atlantic Time is the same time
  3. November 7, 2027 – onwardsAtlantic Time is 1 hour 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

Argentina Time

No clock changes

Argentina Time stays on ART all year, so its offset from UTC never moves.

Atlantic Time

Sunday, March 14, 2027

Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on ADT after that.

ART to AST conversion table

Every hour of Friday, November 13, 2026, converted from Argentina Time to Atlantic Time. 1 of the 24 hours fall on a different calendar day in Halifax, which is marked.

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

Scheduling between the two

Working hours overlap from 10:00 am to 6:00 pm ART, which is 9:00 am to 5:00 pm AST. 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.

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

Other conversions