Seoul to Tokyo time
Seoul and Tokyo both sit on UTC+9 with a zero-hour time difference, and neither uses daylight saving, so their clocks stay perfectly in sync all year.
Enter a valid date and time.
🔒 Conversion runs only in your browser — it works offline and nothing is uploaded.
Seoul and Tokyo: exactly zero hours apart
Seoul (KST) and Tokyo (JST) both run on UTC+9, which means the two cities share the exact same wall-clock time. When it's 3 PM in Seoul, it's 3 PM in Tokyo — no adding or subtracting required. A zero-hour gap is rare among major world city pairs, and it happens here because Korea and Japan both anchor their standard time to the same meridian. On top of that, neither country observes daylight saving time, so no one springs clocks forward or falls them back. Whatever the month or season, Seoul and Tokyo stay in lockstep at a 0-hour difference.
Great for meetings, flights, and live streams
With no offset to juggle, scheduling between Seoul and Tokyo is about as easy as it gets. A 10 AM Seoul video call lands at 10 AM for your Tokyo colleagues too — same number, no conversion. Short hops like Incheon–Haneda take just over two hours, so you simply add the flight time to your departure clock without re-reading the arrival city's zone. Watching NPB baseball or J.League matches, catching a same-day anime simulcast, or checking a Japanese support line's hours? The Japanese time on screen is already your Seoul time. And the best moment to call family in Tokyo is whatever your own clock says right now.
Summer, winter, and automatic dates
Here's a worked example: at 9 AM in Seoul on a July summer morning, it's 9 AM in Tokyo. On a January winter morning, 9 AM in Seoul is still 9 AM in Tokyo — with no daylight saving in either country, the season never shifts the result. Pairs involving Europe or the US bounce by an hour between March and November, but Seoul–Tokyo has no such wrinkle. The converter above applies each location's DST automatically for the exact date you pick, so for these two cities you'll always see the same value no matter which day you choose. Book the time with confidence.
Frequently asked questions
What is the time difference between Seoul and Tokyo?
Zero hours. Seoul (KST) and Tokyo (JST) both use UTC+9, so their clocks are identical. When it's noon in Seoul, it's noon in Tokyo — neither city is ahead of or behind the other.
Does the difference change in summer or winter?
No. Neither South Korea nor Japan observes daylight saving time, so the gap stays fixed at 0 hours all year. Whether it's March or November, summer or winter, 9 AM in Seoul is always 9 AM in Tokyo.
Then why would I need this converter?
You don't need it to do the math, but it's handy for seeing both cities' current time side by side or lining up a meeting slot for a specific date. It also shines when you compare Seoul against cities that do use daylight saving — like New York or London — where it applies the correct offset automatically.