KST (Korean Standard Time) is UTC+9, all year. It is used in Seoul and Pyongyang.
Who uses KST
| IANA time zone | Uses KST | Main cities |
|---|---|---|
| Asia/Seoul | All year | Seoul, Busan, Incheon |
| Asia/Pyongyang | All year | Pyongyang, Hamhung, Nampo |
KST to UTC, GMT and other zones
KST is a fixed offset, so these conversions do not change with the seasons. What changes is which abbreviation a region is using on a given date.
| Zone | UTC offset | When it is 12:00 KST |
|---|---|---|
| UTC | UTC+0 | 3:00 AM |
| GMT | UTC+0 | 3:00 AM |
| EST | UTC−5 | 10:00 PM (previous day) |
| EDT | UTC−4 | 11:00 PM (previous day) |
| CST | UTC−6 | 9:00 PM (previous day) |
| MST | UTC−7 | 8:00 PM (previous day) |
| PST | UTC−8 | 7:00 PM (previous day) |
| CET | UTC+1 | 4:00 AM |
| CEST | UTC+2 | 5:00 AM |
| EET | UTC+2 | 5:00 AM |
| MSK | UTC+3 | 6:00 AM |
| GST | UTC+4 | 7:00 AM |
| IST | UTC+5:30 | 8:30 AM |
| ICT | UTC+7 | 10:00 AM |
| JST | UTC+9 | 12:00 PM |
| AEST | UTC+10 | 1:00 PM |
| AEDT | UTC+11 | 2:00 PM |
Plan around the time in KST
- Convert a time to or from KST: pick a date and time and see it in every city on your list.
- Add Seoul to your world clock to keep it next to your own time.
- Find a meeting time that falls inside office hours in KST and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What is KST in UTC?
KST is UTC+9. To get UTC, subtract 9 hours from KST time.
What time is 12:00 KST in UTC?
12:00 KST is 3:00 AM UTC.
Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.