Convert JST to KST
See how Japan Standard Time compares with Korea Standard Time, check the hour-by-hour table, and plan meetings with confidence.
How Conversion Works
JST and KST both use UTC+9 year-round, so there is no time difference between Japan Standard Time and Korea Standard Time. Convert times instantly without DST offsets or seasonal changes.
Hour-by-Hour Time Table
Use the visual hour-by-hour table to compare JST and KST across the day. Scan matching hours quickly, then export results with ICS download or share via Google Calendar and Gmail.
Schedule Meetings Easily
Find suitable meeting times between Japan and South Korea using the comparison grid and calendar tools. Time data adjusts automatically from the IANA timezone database if rules ever change.
Japan Standard Time (JST) and Korea Standard Time (KST) both use UTC+9, so JST and KST are the same time year-round.
How to Convert JST to KST
Open the JST to KST converter: Go to https://www.xconvert.com/time-converter/jst-to-kst-converter to see the visual comparison grid with JST and KST aligned on a 24-hour timeline. This page is useful when you are scheduling a supplier call between Japan and South Korea, coordinating a gaming launch across Tokyo and Seoul, or planning travel where the local clock time stays identical.
Add comparison cities if your schedule includes other markets: Click + Add City and search for additional locations you need on the grid, such as Tokyo and Seoul for direct Japan–Korea coordination, or another office involved in the same workflow. This is especially helpful for electronics manufacturing, shipping, and regional headquarters teams that work across Japan and South Korea and need to confirm that local business hours match exactly.
Select a time range on the grid: Click Select, then drag across the colored timeline to highlight a meeting window in purple, such as 9:00 to 12:00 or 15:00 to 18:00. Because 9:00 JST = 9:00 KST, 12:00 JST = 12:00 KST, 15:00 JST = 15:00 KST, and 18:00 JST = 18:00 KST, the selected block appears at the same clock time on both rows, which makes it easy to confirm that a morning or afternoon meeting works equally well in Japan and Korea.
Export the selected schedule: After selecting a range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is practical for sending a confirmed meeting slot to teams in Tokyo and Seoul so everyone receives the same local time without any conversion errors.
Understanding the JST to KST Time Difference
JST is UTC+9 and KST is also UTC+9, so there is no time difference between them. No conversion is needed: 9:00 JST = 9:00 KST, 12:00 JST = 12:00 KST, 15:00 JST = 15:00 KST, and 18:00 JST = 18:00 KST.
This same-time relationship stays consistent throughout the entire year because neither Japan Standard Time nor Korea Standard Time observes daylight saving time. The difference does not change in any month, so a meeting scheduled for the same clock time in January will still match exactly in April, July, and November.
JST is used in Japan, while KST is used in South Korea and North Korea. For business coordination, this removes one of the most common scheduling problems in East Asia, since teams can share a single timetable for operations, customer support, product launches, and cross-border meetings.
Best Times for Calls and Meetings Between JST and KST
Because JST and KST are identical, any normal work-hour slot in Japan is the same work-hour slot in Korea. A 9:00 JST meeting starts at 9:00 KST, and a 15:00 JST project review starts at 15:00 KST, which makes same-day collaboration straightforward for companies with offices in Tokyo, Osaka, Seoul, or Busan.
The clearest overlap for standard business use is the daytime window shown directly on the grid, especially examples such as 9:00 to 12:00 and 15:00 to 18:00. Those periods work well for sales calls, logistics coordination, software standups, manufacturing updates, and media planning because both sides see the exact same local clock time.
This also helps with travel and event planning between Japan and Korea. If a flight, hotel check-in discussion, conference session, or partner meeting is arranged for 12:00 JST, it is also 12:00 KST, reducing the chance of missed arrivals or calendar mistakes.
Frequently Asked Questions
What is the time difference between JST and KST?
There is no time difference between JST and KST. Japan Standard Time and Korea Standard Time both use UTC+9, so the local clock time is the same in Japan, South Korea, and North Korea when comparing these two time zones.
When is 9 AM JST in KST?
9:00 JST is 9:00 KST. Since both time zones share the same UTC offset, the hour and minute stay unchanged, which is useful for morning meetings between teams in Japan and Korea.
Does the JST to KST difference change during DST?
No, the difference does not change during daylight saving time because neither JST nor KST observes DST. That means the relationship stays the same in every month of the year, with no seasonal shift and no need to update recurring schedules.
What is 12 PM JST in KST?
12:00 JST = 12:00 KST. Midday meetings, lunch appointments, and handoffs scheduled at noon can be copied directly between Japan and Korea without adjusting the time.
What is 3 PM JST in KST?
15:00 JST = 15:00 KST. This makes afternoon coordination simple for regional business teams, especially when sharing calendars across offices in Japan and South Korea.
What is 6 PM JST in KST?
18:00 JST = 18:00 KST. Evening calls, event timings, and travel plans remain aligned exactly, so there is no risk of being one hour early or late due to time-zone conversion.
What is the best meeting time between JST and KST?
The best meeting time is usually any standard business-hour block that fits both teams’ workdays, because JST and KST are identical. Practical examples include 9:00 to 12:00 and 15:00 to 18:00, since those windows appear at the same local time on both sides and are easy to schedule for operations, sales, and project meetings.
Do I need a converter for JST to KST?
A converter is still useful for visual confirmation, calendar sharing, and comparing JST and KST alongside other cities in a broader international schedule. Even though no conversion is needed between Japan and Korea, the grid helps teams select a meeting range, verify overlap, and export the result to calendar tools without manual errors.