Time zone converter
JST to KST
Convert Japan Time — Tokyo to Korea Time — Seoul — fast, accurate, and daylight-saving aware.
When it's 9:00 AM in Tokyo, it's 9:00 AM in Seoul. Seoul is in the same time as Tokyo. Use the converter above to turn any JST time into KST, or scan the hour-by-hour table below for the full day.
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Japan Time — Tokyo ·
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Korea Time — Seoul ·
Convert a specific timein Tokyo → — in Seoul
JST to KST at a glance
9:00 AM JST
9:00 AM
KST · Seoul
12:00 PM JST
12:00 PM
KST · Seoul
5:00 PM JST
5:00 PM
KST · Seoul
Planning a meeting between Tokyo and Seoul
Planning a call between Tokyo and Seoul? The best overlap during a standard 9-to-5 workday runs 9:00 AM–5:00 PM JST (9:00 AM–5:00 PM KST). Aim for that window to reach both sides during business hours.
Hour-by-hour: Tokyo to Seoul
A full day mapped from JST to KST.
Frequently asked
Is Seoul ahead of or behind Tokyo?
Seoul is in the same time as Tokyo.
What is 12:00 PM JST in KST?
12:00 PM in Tokyo is 12:00 PM in Seoul.
Does this converter account for daylight saving time?
Yes. Conversions use the IANA time zone database, so JST and KST automatically reflect the correct daylight-saving offset for the current date.