KST to JST Time Converter
Convert Korea Standard Time to Japan Standard Time instantly.
Scroll the timeline to check any hour of the day.
Korea Standard Time
KST
5:25
Japan Standard Time
JST
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 KST to JST time difference works
JST is the same time as KST. Korea Standard Time (KST) is the time zone of South Korea. Japan Standard Time (JST) is the time zone of Japan. For example, 9:00 AM KST is 9:00 AM JST. Scroll the timeline above to convert any moment, or use the chart below for a quick reference.
Time difference
None
Daylight saving
Neither
KST offset
UTC+9
JST offset
UTC+9
KST to JST conversion chart
| Korea Standard Time (KST) | Japan Standard Time (JST) |
|---|---|
| 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 KST (9:00 AM to 5:00 PM JST). Schedule inside that window to catch both coasts during business hours.
Cities in each time zone
Korea Standard Time (KST)
SeoulBusanIncheonDaeguDaejeon
Japan Standard Time (JST)
TokyoOsakaYokohamaNagoyaSapporo
KST to JST questions
Is JST ahead of or behind KST?
JST is the same time as KST. So 9:00 AM KST is 9:00 AM JST, and 5:00 PM KST is 5:00 PM JST.
What time is it in JST when it is 12:00 PM KST?
When it is 12:00 PM (noon) KST in Korea Standard Time, it is 12:00 PM JST in Japan Standard Time.
How many hours difference is there between KST and JST?
KST and JST are in the same time zone, so there is no time difference.
Do KST and JST observe daylight saving time?
Neither Korea Standard Time nor Japan 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 KST and JST?
A standard 9-to-5 workday overlaps from 9:00 AM to 5:00 PM KST (9:00 AM to 5:00 PM JST). Scheduling inside that window keeps the call during business hours in both Korea Standard Time and Japan Standard Time.
Which cities use KST and JST?
Korea Standard Time (KST) covers cities such as Seoul, Busan, Incheon, Daegu, Daejeon. Japan Standard Time (JST) covers cities such as Tokyo, Osaka, Yokohama, Nagoya, Sapporo.