JST to KST Time Converter
Convert Japan Standard Time to Korea Standard Time instantly.
Scroll the timeline to check any hour of the day.
Japan Standard Time
JST
5:25
Korea Standard Time
KST
5:25
Search any city, build a custom world clock, and plan across more time zones and options in the FlutterTime app. Free.
How the JST to KST time difference works
KST is the same time as JST. Japan Standard Time (JST) is the time zone of Japan. Korea Standard Time (KST) is the time zone of South Korea. For example, 9:00 AM JST is 9:00 AM KST. Scroll the timeline above to convert any moment, or use the chart below for a quick reference.
Time difference
None
Daylight saving
Neither
JST offset
UTC+9
KST offset
UTC+9
JST to KST conversion chart
| Japan Standard Time (JST) | Korea Standard Time (KST) |
|---|---|
| 12:00 AM | 12:00 AM |
| 1:00 AM | 1:00 AM |
| 2:00 AM | 2:00 AM |
| 3:00 AM | 3:00 AM |
| 4:00 AM | 4:00 AM |
| 5:00 AM | 5:00 AM |
| 6:00 AM | 6:00 AM |
| 7:00 AM | 7:00 AM |
| 8:00 AM | 8:00 AM |
| 9:00 AM | 9:00 AM |
| 10:00 AM | 10:00 AM |
| 11:00 AM | 11:00 AM |
| 12:00 PM | 12:00 PM |
| 1:00 PM | 1:00 PM |
| 2:00 PM | 2:00 PM |
| 3:00 PM | 3:00 PM |
| 4:00 PM | 4:00 PM |
| 5:00 PM | 5:00 PM |
| 6:00 PM | 6:00 PM |
| 7:00 PM | 7:00 PM |
| 8:00 PM | 8:00 PM |
| 9:00 PM | 9:00 PM |
| 10:00 PM | 10:00 PM |
| 11:00 PM | 11:00 PM |
Best time to meet
A standard 9 to 5 workday overlaps from 9:00 AM to 5:00 PM JST (9:00 AM to 5:00 PM KST). Schedule inside that window to catch both coasts during business hours.
Cities in each time zone
Japan Standard Time (JST)
TokyoOsakaYokohamaNagoyaSapporo
Korea Standard Time (KST)
SeoulBusanIncheonDaeguDaejeon
JST to KST questions
Is KST ahead of or behind JST?
KST is the same time as JST. So 9:00 AM JST is 9:00 AM KST, and 5:00 PM JST is 5:00 PM KST.
What time is it in KST when it is 12:00 PM JST?
When it is 12:00 PM (noon) JST in Japan Standard Time, it is 12:00 PM KST in Korea Standard Time.
How many hours difference is there between JST and KST?
JST and KST are in the same time zone, so there is no time difference.
Do JST and KST observe daylight saving time?
Neither Japan Standard Time nor Korea Standard Time observes daylight saving time, and they share the same offset, so they stay in sync all year.
What is the best time to schedule a meeting between JST and KST?
A standard 9-to-5 workday overlaps from 9:00 AM to 5:00 PM JST (9:00 AM to 5:00 PM KST). Scheduling inside that window keeps the call during business hours in both Japan Standard Time and Korea Standard Time.
Which cities use JST and KST?
Japan Standard Time (JST) covers cities such as Tokyo, Osaka, Yokohama, Nagoya, Sapporo. Korea Standard Time (KST) covers cities such as Seoul, Busan, Incheon, Daegu, Daejeon.