Convert JST to KST — Time Difference Between Japan Standard Time and Korea Standard Time
Drag the slider or click the time display to type a specific hour and instantly convert JST to KST — Korea Standard Time and Japan Standard Time are in the same timezone. Scroll down to browse the full JST to KST conversion table, check what time 9 AM, 10 AM, 11 AM, or 12 PM in Tokyo is in Seoul, and use the date picker to compare times on any day for accurate scheduling.
JST
Japan Standard Time
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KST
Korea Standard Time
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JST to KST Time Zone Difference — Hour-by-Hour Conversion Table
Scan each row to find what time any hour in Tokyo is in Seoul — tap the arrows to jump between days, click "Today" to reset, and use the color-coded bands to quickly spot overlapping work hours, early mornings, and late nights at a glance.
| JST (Tokyo) | KST (Seoul) |
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How to Convert JST to KST
Drag the slider on the JST timeline to pick your time — the KST time updates instantly. You can also click the time display to type a specific hour or pick one from the 15-minute interval dropdown, and use the date picker to check a different day.
What Is the Time Difference Between JST and KST?
Japan Standard Time (JST) and Korea Standard Time (KST) share the same UTC offset (UTC+9:00), so there is no time difference between Tokyo and Seoul.
What Time Is It Now in Tokyo?
What Time Is It Now in Seoul?
JST to KST Meeting Planner
Use the color-coded table above to find overlapping work hours between Tokyo and Seoul. Amber rows mark daytime hours — pick a slot that falls in amber on both sides for a meeting that works for everyone.
Why Trust This JST to KST Converter?
Timezoney uses the IANA Time Zone Database — the same source that powers your phone and computer — so every conversion handles daylight saving transitions and half-hour offsets automatically.
Japan Standard Time
- Abbreviation
- JST
- UTC Offset
- UTC+9:00
- City
- Tokyo
- Country
- Japan
Korea Standard Time
- Abbreviation
- KST
- UTC Offset
- UTC+9:00
- City
- Seoul
- Country
- South Korea