What is AWST in AST?
Atlantic Time is 11 hours behind
Australian Western Standard Time is on UTC+8:00 and Atlantic Time is 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 Perth
- 8:03:55 PM
- Time in Halifax
- 9:03:55 AM
- Difference
- −11 h
- Next clock change
- November 1, 2026
Convert a time
ADT — Atlantic Time
9:00 am
ADT, Fri
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:
- Now – November 1, 2026Atlantic Time is 11 hours behind
- November 1, 2026 – March 14, 2027Atlantic Time is 12 hours behind
- March 14, 2027 – onwardsAtlantic Time is 11 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
Australian Western Standard Time stays on AWST all year, so its offset from UTC never moves.
Atlantic Time
Clocks go back one hour — 2:00 am becomes 1:00 am local time, and the zone is on AST after that.
AWST to AST conversion table
Every hour of Friday, September 25, 2026, converted from Australian Western Standard Time to Atlantic Time. 11 of the 24 hours fall on a different calendar day in Halifax, which is marked.
- 12:00 am AWST
- 1:00 pm ADT−1 day
- 1:00 am AWST
- 2:00 pm ADT−1 day
- 2:00 am AWST
- 3:00 pm ADT−1 day
- 3:00 am AWST
- 4:00 pm ADT−1 day
- 4:00 am AWST
- 5:00 pm ADT−1 day
- 5:00 am AWST
- 6:00 pm ADT−1 day
- 6:00 am AWST
- 7:00 pm ADT−1 day
- 7:00 am AWST
- 8:00 pm ADT−1 day
- 8:00 am AWST
- 9:00 pm ADT−1 day
- 9:00 am AWST
- 10:00 pm ADT−1 day
- 10:00 am AWST
- 11:00 pm ADT−1 day
- 11:00 am AWST
- 12:00 am ADT
- 12:00 pm AWST
- 1:00 am ADT
- 1:00 pm AWST
- 2:00 am ADT
- 2:00 pm AWST
- 3:00 am ADT
- 3:00 pm AWST
- 4:00 am ADT
- 4:00 pm AWST
- 5:00 am ADT
- 5:00 pm AWST
- 6:00 am ADT
- 6:00 pm AWST
- 7:00 am ADT
- 7:00 pm AWST
- 8:00 am ADT
- 8:00 pm AWST
- 9:00 am ADT
- 9:00 pm AWST
- 10:00 am ADT
- 10:00 pm AWST
- 11:00 am ADT
- 11:00 pm AWST
- 12:00 pm ADT
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 (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico
Other conversions
- AST to AWST
- AWST to UTC
- AWST to GMT
- AWST to EST
- AWST to CST
- AWST to MST
- AWST to PST
- AWST to AKST
- AWST to HST
- AWST to BST
- AWST to CET
- AWST to IST
- AWST to CST (China)
- AWST to JST
- AWST to AEST
- AWST to Mexico City
- AWST to BRT
- AWST to ART
- AWST to EET
- AWST to WET
- AWST to MSK
- AWST to TRT
- AWST to SAST
- AWST to WAT
- AWST to EAT
- AWST to GST
- AWST to PKT
- AWST to ICT
- AWST to WIB
- AWST to SGT
- AWST to HKT
- AWST to KST
- AWST to PHT
- AWST to ACST
- AWST to NZST
- All zones