Seoul uses Korea Standard Time (UTC+09:00), the same offset as Tokyo.
Detecting your timezone for a personal comparison…
Now
South Korea’s capital shares an offset with Japan but uses Asia/Seoul. There is no current daylight-saving change. US correspondents should still check Eastern or Pacific DST when converting from KST.
Seoul uses Asia/Seoul. The current offset is UTC+09:00. Clocks on this page update from that IANA zone rather than from the server’s local time.
Seoul, South Korea is in Korea Standard Time (Asia/Seoul). Seoul uses Korea Standard Time (UTC+09:00), the same offset as Tokyo.
This time zone does not observe daylight saving time South Korea does not currently observe daylight saving time.
At this moment the offset difference is +00:00 hours relative to UTC labels, meaning Seoul compared with Tokyo can be converted in the time zone converter using Asia/Seoul and Asia/Tokyo. Daylight saving on either side is applied automatically.