What is AST in KST?
Korea Standard Time is 12 hours ahead
Atlantic Time is on UTC−3:00 and Korea Standard Time is on UTC+9:00 right now. Atlantic Time is on daylight saving, so its clocks read ADT. The gap changes during the year — see below.
- Time in Halifax
- 9:52:25 AM
- Time in Seoul
- 9:52:25 PM
- Difference
- +12 h
- Next clock change
- November 1, 2026
Convert a time
KST — Korea Standard Time
9:00 pm
KST, Fri
When the difference changes
Atlantic Time and Korea Standard 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, 2026Korea Standard Time is 12 hours ahead
- November 1, 2026 – March 14, 2027Korea Standard Time is 13 hours ahead
- March 14, 2027 – onwardsKorea Standard Time is 12 hours ahead
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
Atlantic Time
Clocks go back one hour — 2:00 am becomes 1:00 am local time, and the zone is on AST after that.
Korea Standard Time
Korea Standard Time stays on KST all year, so its offset from UTC never moves.
AST to KST conversion table
Every hour of Friday, September 25, 2026, converted from Atlantic Time to Korea Standard Time. 12 of the 24 hours fall on a different calendar day in Seoul, which is marked.
- 12:00 am ADT
- 12:00 pm KST
- 1:00 am ADT
- 1:00 pm KST
- 2:00 am ADT
- 2:00 pm KST
- 3:00 am ADT
- 3:00 pm KST
- 4:00 am ADT
- 4:00 pm KST
- 5:00 am ADT
- 5:00 pm KST
- 6:00 am ADT
- 6:00 pm KST
- 7:00 am ADT
- 7:00 pm KST
- 8:00 am ADT
- 8:00 pm KST
- 9:00 am ADT
- 9:00 pm KST
- 10:00 am ADT
- 10:00 pm KST
- 11:00 am ADT
- 11:00 pm KST
- 12:00 pm ADT
- 12:00 am KST+1 day
- 1:00 pm ADT
- 1:00 am KST+1 day
- 2:00 pm ADT
- 2:00 am KST+1 day
- 3:00 pm ADT
- 3:00 am KST+1 day
- 4:00 pm ADT
- 4:00 am KST+1 day
- 5:00 pm ADT
- 5:00 am KST+1 day
- 6:00 pm ADT
- 6:00 am KST+1 day
- 7:00 pm ADT
- 7:00 am KST+1 day
- 8:00 pm ADT
- 8:00 am KST+1 day
- 9:00 pm ADT
- 9:00 am KST+1 day
- 10:00 pm ADT
- 10:00 am KST+1 day
- 11:00 pm ADT
- 11:00 am KST+1 day
Scheduling between the two
There is no overlap between a nine-to-six working day in Halifax and one in Seoul — the gap is too wide. A call has to sit early or late for one side. Early morning in Halifax is the usual compromise, since that is late afternoon or evening in Seoul.
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
- KST to AST
- AST to UTC
- AST to GMT
- AST to EST
- AST to CST
- AST to MST
- AST to PST
- AST to AKST
- AST to HST
- AST to BST
- AST to CET
- AST to IST
- AST to CST (China)
- AST to JST
- AST to AEST
- AST to Mexico City
- AST to BRT
- AST to ART
- AST to EET
- AST to WET
- AST to MSK
- AST to TRT
- AST to SAST
- AST to WAT
- AST to EAT
- AST to GST
- AST to PKT
- AST to ICT
- AST to WIB
- AST to SGT
- AST to HKT
- AST to PHT
- AST to AWST
- AST to ACST
- AST to NZST
- All zones