What is KST in AST?
Atlantic Time is 12 hours behind
Korea Standard Time is on UTC+9:00 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 Seoul
- 9:52:28 PM
- Time in Halifax
- 9:52:28 AM
- Difference
- −12 h
- Next clock change
- November 1, 2026
Convert a time
ADT — Atlantic Time
9:00 am
ADT, Fri
When the difference changes
Korea 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 12 hours behind
- November 1, 2026 – March 14, 2027Atlantic Time is 13 hours behind
- March 14, 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
Korea Standard Time
Korea Standard Time stays on KST 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.
KST to AST conversion table
Every hour of Friday, September 25, 2026, converted from Korea Standard Time to Atlantic Time. 12 of the 24 hours fall on a different calendar day in Halifax, which is marked.
- 12:00 am KST
- 12:00 pm ADT−1 day
- 1:00 am KST
- 1:00 pm ADT−1 day
- 2:00 am KST
- 2:00 pm ADT−1 day
- 3:00 am KST
- 3:00 pm ADT−1 day
- 4:00 am KST
- 4:00 pm ADT−1 day
- 5:00 am KST
- 5:00 pm ADT−1 day
- 6:00 am KST
- 6:00 pm ADT−1 day
- 7:00 am KST
- 7:00 pm ADT−1 day
- 8:00 am KST
- 8:00 pm ADT−1 day
- 9:00 am KST
- 9:00 pm ADT−1 day
- 10:00 am KST
- 10:00 pm ADT−1 day
- 11:00 am KST
- 11:00 pm ADT−1 day
- 12:00 pm KST
- 12:00 am ADT
- 1:00 pm KST
- 1:00 am ADT
- 2:00 pm KST
- 2:00 am ADT
- 3:00 pm KST
- 3:00 am ADT
- 4:00 pm KST
- 4:00 am ADT
- 5:00 pm KST
- 5:00 am ADT
- 6:00 pm KST
- 6:00 am ADT
- 7:00 pm KST
- 7:00 am ADT
- 8:00 pm KST
- 8:00 am ADT
- 9:00 pm KST
- 9:00 am ADT
- 10:00 pm KST
- 10:00 am ADT
- 11:00 pm KST
- 11:00 am ADT
Scheduling between the two
There is no overlap between a nine-to-six working day in Seoul and one in Halifax — the gap is too wide. A call has to sit early or late for one side. Early morning in Seoul 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.
Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico
Other conversions
- AST to KST
- KST to UTC
- KST to GMT
- KST to EST
- KST to CST
- KST to MST
- KST to PST
- KST to AKST
- KST to HST
- KST to BST
- KST to CET
- KST to IST
- KST to CST (China)
- KST to JST
- KST to AEST
- KST to Mexico City
- KST to BRT
- KST to ART
- KST to EET
- KST to WET
- KST to MSK
- KST to TRT
- KST to SAST
- KST to WAT
- KST to EAT
- KST to GST
- KST to PKT
- KST to ICT
- KST to WIB
- KST to SGT
- KST to HKT
- KST to PHT
- KST to AWST
- KST to ACST
- KST to NZST
- All zones