What is AEST in AST?
Atlantic Time is 13 hours behind
Australian Eastern Time is on UTC+10:00 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 Sydney
- 10:52:29 PM
- Time in Halifax
- 9:52:29 AM
- Difference
- −13 h
- Next clock change
- October 4, 2026
Convert a time
ADT — Atlantic Time
9:00 am
ADT, Fri
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:
- Now – October 4, 2026Atlantic Time is 13 hours behind
- October 4, 2026 – November 1, 2026Atlantic Time is 14 hours behind
- November 1, 2026 – March 14, 2027Atlantic Time is 15 hours behind
- March 14, 2027 – April 4, 2027Atlantic Time is 14 hours behind
- April 4, 2027 – October 3, 2027Atlantic Time is 13 hours behind
- October 3, 2027 – onwardsAtlantic Time is 14 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
Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on AEDT after that.
Atlantic Time
Clocks go back one hour — 2:00 am becomes 1:00 am local time, and the zone is on AST after that.
AEST to AST conversion table
Every hour of Friday, September 25, 2026, converted from Australian Eastern Time to Atlantic Time. 13 of the 24 hours fall on a different calendar day in Halifax, which is marked.
- 12:00 am AEST
- 11:00 am ADT−1 day
- 1:00 am AEST
- 12:00 pm ADT−1 day
- 2:00 am AEST
- 1:00 pm ADT−1 day
- 3:00 am AEST
- 2:00 pm ADT−1 day
- 4:00 am AEST
- 3:00 pm ADT−1 day
- 5:00 am AEST
- 4:00 pm ADT−1 day
- 6:00 am AEST
- 5:00 pm ADT−1 day
- 7:00 am AEST
- 6:00 pm ADT−1 day
- 8:00 am AEST
- 7:00 pm ADT−1 day
- 9:00 am AEST
- 8:00 pm ADT−1 day
- 10:00 am AEST
- 9:00 pm ADT−1 day
- 11:00 am AEST
- 10:00 pm ADT−1 day
- 12:00 pm AEST
- 11:00 pm ADT−1 day
- 1:00 pm AEST
- 12:00 am ADT
- 2:00 pm AEST
- 1:00 am ADT
- 3:00 pm AEST
- 2:00 am ADT
- 4:00 pm AEST
- 3:00 am ADT
- 5:00 pm AEST
- 4:00 am ADT
- 6:00 pm AEST
- 5:00 am ADT
- 7:00 pm AEST
- 6:00 am ADT
- 8:00 pm AEST
- 7:00 am ADT
- 9:00 pm AEST
- 8:00 am ADT
- 10:00 pm AEST
- 9:00 am ADT
- 11:00 pm AEST
- 10:00 am ADT
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 (AEST) is used in Melbourne, Canberra and Brisbane. Queensland stays on AEST all year while the southern states move to AEDT.
Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico
Other conversions
- AST to AEST
- AEST to UTC
- AEST to GMT
- AEST to EST
- AEST to CST
- AEST to MST
- AEST to PST
- AEST to AKST
- AEST to HST
- AEST to BST
- AEST to CET
- AEST to IST
- AEST to CST (China)
- AEST to JST
- AEST to Mexico City
- AEST to BRT
- AEST to ART
- AEST to EET
- AEST to WET
- AEST to MSK
- AEST to TRT
- AEST to SAST
- AEST to WAT
- AEST to EAT
- AEST to GST
- AEST to PKT
- AEST to ICT
- AEST to WIB
- AEST to SGT
- AEST to HKT
- AEST to KST
- AEST to PHT
- AEST to AWST
- AEST to ACST
- AEST to NZST
- All zones