What is ART in AST?

Atlantic Time is the same time

Argentina Time and Atlantic Time are both 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 Buenos Aires: 9:52:37 AM
Time in Halifax: 9:52:37 AM
Difference: None
Next clock change: November 1, 2026

Convert a time

ART — Argentina Time

ADT — Atlantic Time

9:00 am

ADT, Fri

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:

Now – November 1, 2026Atlantic Time is the same time
November 1, 2026 – March 14, 2027Atlantic Time is 1 hour behind
March 14, 2027 – onwardsAtlantic Time is the same time

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, 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.

ART to AST conversion table

Every hour of Friday, September 25, 2026, converted from Argentina Time to Atlantic Time.

12:00 am ART: 12:00 am ADT
1:00 am ART: 1:00 am ADT
2:00 am ART: 2:00 am ADT
3:00 am ART: 3:00 am ADT
4:00 am ART: 4:00 am ADT
5:00 am ART: 5:00 am ADT
6:00 am ART: 6:00 am ADT
7:00 am ART: 7:00 am ADT
8:00 am ART: 8:00 am ADT
9:00 am ART: 9:00 am ADT
10:00 am ART: 10:00 am ADT
11:00 am ART: 11:00 am ADT

12:00 pm ART: 12:00 pm ADT
1:00 pm ART: 1:00 pm ADT
2:00 pm ART: 2:00 pm ADT
3:00 pm ART: 3:00 pm ADT
4:00 pm ART: 4:00 pm ADT
5:00 pm ART: 5:00 pm ADT
6:00 pm ART: 6:00 pm ADT
7:00 pm ART: 7:00 pm ADT
8:00 pm ART: 8:00 pm ADT
9:00 pm ART: 9:00 pm ADT
10:00 pm ART: 10:00 pm ADT
11:00 pm ART: 11:00 pm ADT

Scheduling between the two

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

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