Convert JST to KST
See the live JST to KST conversion, compare hours side by side, and schedule calls between Japan and South Korea with confidence.
How JST to KST Works
JST and KST both use UTC+9, so the time difference is 0 hours year-round. Convert times instantly between Japan Standard Time and Korea Standard Time with matching local hours.
Hour-by-Hour Conversion Table
Use the visual grid and hour-by-hour table to compare JST and KST across the day. Export selected times with ICS download or send them to Google Calendar and Gmail.
Schedule Meetings Accurately
Plan meetings between Japan and South Korea using automatically adjusted timezone data. DST tracking and historical accuracy are based on the IANA timezone database.
How to Convert JST to KST
Open the JST to KST converter: Visit https://www.xconvert.com/time-converter/jst-to-kst-converter to load a visual comparison page for Japan Standard Time and Korea Standard Time. You would use this page when scheduling a call between Tokyo and Seoul, coordinating a supplier update between Japan and South Korea, or confirming broadcast, gaming, logistics, or travel timings across the two countries.
Add comparison cities if you need a wider schedule view: Click + Add City and search for cities that matter to your workflow, such as Tokyo, Seoul, or Pyongyang, depending on whether you are coordinating with teams in Japan, South Korea, or North Korea. This is especially useful for regional operations teams, entertainment companies planning simultaneous releases, and manufacturers managing same-day communication across East Asia.
Select a time range on the grid: Click Select to enter selection mode, then drag across the colored timeline to highlight a meeting window in purple, such as 9:00 to 12:00 JST, which aligns exactly with 9:00 to 12:00 KST. You can drag the center of the highlighted block to move the meeting later in the day or use the left and right handles to resize it, which helps when comparing options like 15:00 JST = 15:00 KST or 18:00 JST = 18:00 KST for afternoon handoffs or evening coordination.
Export and share the selected schedule: Once a time range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is practical when sending a confirmed same-time meeting slot to a Tokyo client and a Seoul partner, because everyone receives the event in their local calendar without needing any manual adjustment.
Understanding the JST to KST Time Difference
JST and KST are the same time. Japan Standard Time is UTC+9, and Korea Standard Time is also UTC+9, so there is no offset to convert when moving between the two.
That means common business-hour examples stay identical across both time zones: 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. If a team in Tokyo starts a meeting at 9:00 in the morning, colleagues in Seoul or Pyongyang join at 9:00 on the same day.
Daylight saving time does not change this relationship. JST does not observe DST and KST does not observe DST, so the difference does not change in any month of the year. The time alignment remains the same in January, April, July, and October, which makes recurring scheduling between Japan and Korea straightforward for remote teams, airlines, media companies, and regional headquarters.
JST is used in Japan, while KST is used in North Korea and South Korea. For companies handling East Asian operations, this same-time relationship removes the usual friction of seasonal clock changes and makes it easier to set fixed support hours, trading coordination windows, and recurring project check-ins.
Best Times for Calls and Meetings Between JST and KST
Because JST and KST are the same time, the best meeting windows are usually the same local clock hours in both locations. A morning call at 9:00 JST is 9:00 KST, a lunch-hour checkpoint at 12:00 JST is 12:00 KST, and an afternoon review at 15:00 JST is 15:00 KST.
For standard office coordination, the clearest overlap is the normal daytime block shown directly on the grid. Teams in Japan and Korea can schedule standups, client reviews, operations calls, and product demos without translating the hour, which is useful for cross-border manufacturing, electronics supply chains, gaming companies, and media partnerships working on same-day deliverables.
The examples also show that later-day collaboration stays simple: 18:00 JST = 18:00 KST. That makes after-hours support escalations, release monitoring, and end-of-day reporting easier than in regions where one side shifts for daylight saving time and the other does not.
This same-time setup is particularly convenient for recurring meetings. If you set a weekly call for 9:00 JST, everyone on KST joins at 9:00 KST every week, with no seasonal rescheduling and no need to update calendar invites during the year.
Frequently Asked Questions
What is the time difference between JST and KST?
There is no time difference between JST and KST. JST is UTC+9 and KST is UTC+9, so both time zones show the same local time at the same moment.
This means you do not need to add or subtract hours when converting between them. If your Tokyo office sends a meeting invite for 15:00 JST, your contacts in Seoul or Pyongyang attend at 15:00 KST.
When is 9 AM JST in KST?
9:00 JST = 9:00 KST. The hour stays exactly the same because both time zones use UTC+9.
This is useful for morning business calls, school schedules, transport planning, and daily standups. A 9 AM start in Japan is also a 9 AM start in Korea, with no conversion step required.
Does the JST to KST difference change during DST?
No, the difference does not change during daylight saving time. JST does not observe DST and KST does not observe DST, so the relationship stays the same all year.
There are no months when Japan moves its clocks and Korea does not, or vice versa. As a result, recurring meetings and shared operating hours remain stable from January through December.
What is 12 PM JST in KST?
12:00 JST = 12:00 KST. Since the two time zones are the same, noon in Japan is also noon in Korea.
This makes midday coordination especially easy for lunch meetings, shipping updates, and regional management check-ins. Teams can use one shared schedule without maintaining separate time references.
What is 3 PM JST in KST?
15:00 JST = 15:00 KST. There is no shift, no date change, and no seasonal adjustment between the two time zones.
That consistency is helpful for afternoon reviews, handoff meetings, and customer support coordination. If a project milestone is set for 3 PM in Tokyo, the same 3 PM deadline applies in Korea.
What is 6 PM JST in KST?
18:00 JST = 18:00 KST. Evening schedules remain aligned because both JST and KST are UTC+9.
This is useful for end-of-day reporting, live event timing, and release management. A 6 PM status call in Japan appears as 6 PM in Korea without any manual conversion.
What is the best meeting time between JST and KST?
The best meeting time is usually any normal work-hour slot that suits both teams, because JST and KST are identical. Common examples include 9:00, 12:00, 15:00, and 18:00, and each one stays the same in both time zones.
This makes scheduling unusually simple for companies operating between Japan and Korea. You can choose the most convenient business window based on team availability rather than on time-zone math.
Is JST the same as KST all year?
Yes, JST and KST are the same all year. Both are UTC+9, and neither one observes daylight saving time.
That means the conversion does not change by season, month, or date. For recurring calendars, travel itineraries, and regional operations planning, the same local hour applies in both Japan and Korea throughout the year.