AST to KST Converter
KST is 13 hours ahead of AST. 9:00 AM AST = 10:00 PM KST.
KST is 13 hours ahead of AST at the moment. To convert AST to KST, add 13 hours to the AST time: 9:00 AM AST = 10:00 PM KST.
AST (Atlantic Time) is used in Nova Scotia, New Brunswick, PEI; Puerto Rico and the Eastern Caribbean (all year). KST (Korea Time) is used in South Korea.
AST here is Atlantic Standard Time, not Arabia Standard Time.
AST to KST time conversion table
AST to KST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| AST | KST | Day |
|---|---|---|
| 12:00 AM AST | 1:00 PM KST | — |
| 1:00 AM AST | 2:00 PM KST | — |
| 2:00 AM AST | 3:00 PM KST | — |
| 3:00 AM AST | 4:00 PM KST | — |
| 4:00 AM AST | 5:00 PM KST | — |
| 5:00 AM AST | 6:00 PM KST | — |
| 6:00 AM AST | 7:00 PM KST | — |
| 7:00 AM AST | 8:00 PM KST | — |
| 8:00 AM AST | 9:00 PM KST | — |
| 9:00 AM AST | 10:00 PM KST | night |
| 10:00 AM AST | 11:00 PM KST | night |
| 11:00 AM AST | 12:00 AM KST | next day |
| 12:00 PM AST | 1:00 AM KST | next day |
| 1:00 PM AST | 2:00 AM KST | next day |
| 2:00 PM AST | 3:00 AM KST | next day |
| 3:00 PM AST | 4:00 AM KST | next day |
| 4:00 PM AST | 5:00 AM KST | next day |
| 5:00 PM AST | 6:00 AM KST | next day |
| 6:00 PM AST | 7:00 AM KST | next day |
| 7:00 PM AST | 8:00 AM KST | next day |
| 8:00 PM AST | 9:00 AM KST | next day |
| 9:00 PM AST | 10:00 AM KST | next day |
| 10:00 PM AST | 11:00 AM KST | next day |
| 11:00 PM AST | 12:00 PM KST | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert AST to KST
Add 13 hours to the AST time to get KST.
Example: 9:00 AM AST = 10:00 PM KST.
Across midnight: 10:00 PM AST = 11:00 AM KST (next day). The date changes, so always check the day as well as the hour.
Time difference between AST and KST
The time difference between AST and KST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 31 Dec 2025 – 7 Mar 2026: KST is 13 hours ahead of AST.
- 8 Mar 2026 – 31 Oct 2026: KST is 12 hours ahead of AST.
- 1 Nov 2026 – 30 Dec 2026: KST is 13 hours ahead of AST.
AST and KST during daylight saving time
- AST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from AST (UTC−4) to ADT (UTC−3).
- KST does not observe daylight saving time; it stays on UTC+9 all year.
Best time for a meeting between AST and KST
AST and KST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM AST, which is 8:00 PM KST.
AST to KST FAQ
What is the time difference between AST and KST?
Right now KST is 13 hours ahead of AST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM AST in KST?
9:00 AM AST is 10:00 PM KST.
What is 12 PM (noon) AST in KST?
12:00 PM AST is 1:00 AM KST (next day).
Is KST ahead of or behind AST?
KST is 13 hours ahead of AST, so it is later in KST than in AST.
Does AST change for daylight saving time?
Yes. AST next changes on 14 Mar 2027, when clocks go forward one hour from AST to ADT.
Does KST change for daylight saving time?
No. KST stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between AST and KST?
AST and KST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM AST, which is 8:00 PM KST.
Related conversions
Convert KST to AST
Convert AST to other time zones
Convert other time zones to KST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.