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DateAlmanac

What is AEST in AST?

Atlantic Time is 15 hours behind

Australian Eastern Time is on UTC+11:00 and Atlantic Time is on UTC−4:00 right now. Australian Eastern Time is on daylight saving, so its clocks read AEDT. The gap changes during the year — see below.

Convert a time

AST — Atlantic Time

6:00 am

AST, Fri

Time in Sydney
9:00:45 PM
Time in Halifax
6:00:45 AM
Difference
−15 h
Next clock change
March 14, 2027

When the difference changes

Australian Eastern 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 15 hours behind
  2. March 14, 2027 – April 4, 2027Atlantic Time is 14 hours behind
  3. April 4, 2027 – October 3, 2027Atlantic Time is 13 hours behind
  4. October 3, 2027 – November 7, 2027Atlantic Time is 14 hours behind
  5. November 7, 2027 – onwardsAtlantic Time is 15 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

Australian Eastern Time

Sunday, April 4, 2027

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

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.

AEST to AST conversion table

Every hour of Friday, November 13, 2026, converted from Australian Eastern Time to Atlantic Time. 15 of the 24 hours fall on a different calendar day in Halifax, which is marked.

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

Scheduling between the two

There is no overlap between a nine-to-six working day in Sydney and one in Halifax — the gap is too wide. A call has to sit early or late for one side. Early morning in Sydney is the usual compromise, since that is late afternoon or evening in Halifax.

A note on AST: it can also mean Arabia Standard Time (UTC+3). This page means Atlantic Time.

Australian Eastern Time (AEDT) is used in Melbourne, Canberra and Brisbane. Queensland stays on AEST all year while the southern states move to AEDT.

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

Other conversions