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DateAlmanac

What is GST in AST?

Atlantic Time is 8 hours behind

Gulf Standard Time is on UTC+4:00 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 Dubai
2:00:48 PM
Time in Halifax
6:00:48 AM
Difference
−8 h
Next clock change
March 14, 2027

When the difference changes

Gulf Standard 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 8 hours behind
  2. March 14, 2027 – November 7, 2027Atlantic Time is 7 hours behind
  3. November 7, 2027 – onwardsAtlantic Time is 8 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

Gulf Standard Time

No clock changes

Gulf Standard Time stays on GST 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.

GST to AST conversion table

Every hour of Friday, November 13, 2026, converted from Gulf Standard Time to Atlantic Time. 8 of the 24 hours fall on a different calendar day in Halifax, which is marked.

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

Scheduling between the two

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

Gulf Standard Time (GST) is used in the UAE and Oman

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

Other conversions