Convert Japan Standard Time to Korea Standard Time - Quick & Accurate
Updates live every second
Hover over any hour to see corresponding time in both zones
To schedule a meeting between JST and KST:
Pro Tip: Schedule calls during the overlap window for optimal convenience for both time zones
| JST Time | KST Time | Context |
|---|---|---|
| 12:00 AM | 12:00 AM | Midnight JST |
| 01:00 AM | 01:00 AM | Late Night |
| 02:00 AM | 02:00 AM | Late Night |
| 03:00 AM | 03:00 AM | Late Night |
| 04:00 AM | 04:00 AM | Late Night |
| 05:00 AM | 05:00 AM | Late Night |
| 06:00 AM | 06:00 AM | Early Morning JST |
| 07:00 AM | 07:00 AM | Night Time |
| 08:00 AM | 08:00 AM | Night Time |
| 09:00 AM | 09:00 AM | Work Starts JST |
| 10:00 AM | 10:00 AM | Night Time |
| 11:00 AM | 11:00 AM | Night Time |
Tokyo
Asia/Tokyo
Seoul
Asia/Seoul
KST (Korea Standard Time) is 0 hours ahead of JST (Japan Standard Time). This means when it's 12:00 PM in Tokyo (JST), it's 12:00 PM in Seoul (KST).
The best time to call from JST to KST is during overlapping business hours. For JST callers, schedule between 9:00 AM - 12:00 PM JST to ensure both parties are within standard business hours.
The time difference may change during daylight saving transitions if one region observes DST while the other doesn't. Japan Standard Time (UTC+9) and Korea Standard Time (UTC+9) may have different DST schedules.
JST includes cities like Tokyo. KST includes cities like Seoul. Both time zones cover important business and cultural centers.
In 2025, DST in North America starts on March 9 at 2:00 AM and ends on November 2 at 2:00 AM. Other regions may have different DST schedules or not observe DST at all.