KST: Korean Standard Time
Korea Standard Time (KST). South Korea, including Seoul and Busan. KST is UTC+9 all year.
No clock change is scheduled; the offset stays the same all year.
KST to AST: Korea Standard Time to Atlantic Time
13 hours behind KST
AST compared with KST, right now. Swap: AST to KST ⇄
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KST to AST conversion table
For Tuesday, November 3, 2026. Rows where both places are inside 9 AM–5 PM are highlighted.
| KST | AST |
|---|---|
| 12:00 AM | 11:00 AM (previous day) |
| 1:00 AM | 12:00 PM (previous day) |
| 2:00 AM | 1:00 PM (previous day) |
| 3:00 AM | 2:00 PM (previous day) |
| 4:00 AM | 3:00 PM (previous day) |
| 5:00 AM | 4:00 PM (previous day) |
| 6:00 AM | 5:00 PM (previous day) |
| 7:00 AM | 6:00 PM (previous day) |
| 8:00 AM | 7:00 PM (previous day) |
| 9:00 AM | 8:00 PM (previous day) |
| 10:00 AM | 9:00 PM (previous day) |
| 11:00 AM | 10:00 PM (previous day) |
| 12:00 PM | 11:00 PM (previous day) |
| 1:00 PM | 12:00 AM |
| 2:00 PM | 1:00 AM |
| 3:00 PM | 2:00 AM |
| 4:00 PM | 3:00 AM |
| 5:00 PM | 4:00 AM |
| 6:00 PM | 5:00 AM |
| 7:00 PM | 6:00 AM |
| 8:00 PM | 7:00 AM |
| 9:00 PM | 8:00 AM |
| 10:00 PM | 9:00 AM |
| 11:00 PM | 10:00 AM |
About these time zones
AST: Atlantic Standard Time
Atlantic Time (AST/ADT). Nova Scotia, New Brunswick and Prince Edward Island (with daylight saving), plus Puerto Rico and much of the Caribbean, which stay on AST (UTC−4) all year.
Sunday, March 14, 2027: clocks go forward 1 hour at 2:00 AM local time (UTC−4 → UTC−3).
Questions about KST and AST time
What is the time difference between KST and AST?
The current difference is shown at the top of this page. KST uses Korean Standard Time (KST, UTC+9) all year; AST uses Atlantic Standard Time (AST, UTC−4) as standard time and Atlantic Daylight Time (ADT, UTC−3) during daylight saving time. The difference can change if only one side observes daylight saving time or if their clocks change on different dates. Choose your meeting date in the converter to check the applicable offset.
When it is 9:00 AM in KST, what time is it in AST?
On Tuesday, November 3, 2026, 9:00 AM in KST was 8:00 PM (previous day) in AST. The conversion table above shows today’s values.
Do the clocks change in KST or AST?
KST does not change its clocks. AST: Sunday, March 14, 2027: clocks go forward 1 hour at 2:00 AM local time (UTC−4 → UTC−3).
Is KST the same as KST?
Korea Standard Time does not use daylight saving time, so KST applies all year.
Related conversions
- 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 EET
- KST to PKT
- KST to IST
- KST to SGT
- KST to PHT
- KST to JST
- KST to AEST
- KST to NZST
- UTC to AST
- GMT to AST
- EST to AST
- CST to AST
- MST to AST
- PST to AST
- AKST to AST
- HST to AST
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