Tokyo to Seoul time
Tokyo and Seoul keep the exact same clock — both sit on UTC+9, so whatever time it is in one city is the very same time in the other.
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Tokyo and Seoul: a zero-hour difference
Tokyo runs on Japan Standard Time (JST) and Seoul on Korea Standard Time (KST), yet both are fixed at UTC+9. That makes this one of the rare city pairs with no time difference at all: the hour, the minute, and even the calendar date line up perfectly. There is nothing to add or subtract — 3 PM in Shibuya is 3 PM in Gangnam. You simply read the time as shown, with no risk of booking a meeting an hour off because you misjudged the zones.
No daylight saving, so the gap never moves
Neither Japan nor South Korea observes daylight saving time, so the zero-hour offset holds every single day of the year. Take 9 AM in Tokyo: in the middle of July it is 9 AM in Seoul, and in the depth of January it is still 9 AM in Seoul. That is unlike Tokyo–London or Tokyo–New York, where the gap shifts by an hour twice a year. This pair has no changeover dates and no seasonal exceptions to remember at all.
Why you'd still use the converter
Even with no offset, this tool earns its place. Confirm the difference really is zero for an exact date, and watch both live clocks tick side by side in the moment before a call. Add a third city — say Los Angeles — to the same plan, and its daylight saving is applied automatically for that date. It's also handy for scheduling a roughly 2h15m Haneda–Gimpo flight, or for catching a Seoul livestream or match from Tokyo without second-guessing the date.
Frequently asked questions
If it's 9 AM in Tokyo, what time is it in Seoul?
9 AM the same day. Because both cities are permanently on UTC+9, the time and the calendar date always match, with nothing to add or subtract. The answer is identical in summer and in winter.
Does summer time (DST) ever create a gap?
No. Neither Japan nor South Korea uses daylight saving time, so Tokyo and Seoul stay in perfect sync all year. Unlike a pair such as Tokyo–London, the difference between these two never becomes 1 hour in summer.
If the difference is zero, why use the tool at all?
To be certain. It applies each zone's real rules for the exact date you choose, shows both live clocks side by side, and lets you add other cities whose DST it adjusts automatically — so a Tokyo–Seoul–LA meeting still lines up correctly.