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DateAlmanac

What is AWST in AST?

Atlantic Time is 12 hours behind

Australian Western Standard Time is on UTC+8:00 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 Perth
6:08:48 PM
Time in Halifax
6:08:48 AM
Difference
−12 h
Next clock change
March 14, 2027

When the difference changes

Australian Western 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 12 hours behind
  2. March 14, 2027 – November 7, 2027Atlantic Time is 11 hours behind
  3. November 7, 2027 – onwardsAtlantic Time is 12 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 Western Standard Time

No clock changes

Australian Western Standard Time stays on AWST 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.

AWST to AST conversion table

Every hour of Friday, November 13, 2026, converted from Australian Western Standard Time to Atlantic Time. 12 of the 24 hours fall on a different calendar day in Halifax, which is marked.

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

Scheduling between the two

There is no overlap between a nine-to-six working day in Perth and one in Halifax — the gap is too wide. A call has to sit early or late for one side. Early morning in Perth 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 Western Standard Time (AWST) is used in Western Australia, which does not observe daylight saving

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

Other conversions