Seoul time explained
South Korea sits nine hours ahead of UTC with no daylight saving, sharing a clock with Japan. The country briefly moved to a half-hour offset in 2015 — a symbolic realignment — before reverting, and last used summer time for the 1988 Seoul Olympics.
Seoul does not observe daylight saving. Its offset from UTC is the same all year round, which makes scheduling with it noticeably simpler.
Reaching Seoul
Seoul keeps exactly the same clock as Tokyo, so the two cities schedule as one. Europe is a late-afternoon call at best, and the Americas fall outside the working day entirely.
How this page works
The time above is calculated on your own device from the IANA time zone
database that ships with your browser, using the zone
Asia/Seoul. Nothing is fetched from a server, and the offset
shown is whatever is currently in force rather than a
number typed into the page — so when a country changes its rules, this
page changes with it.
The difference from your own clock is worked out the same way, comparing Seoul's current offset against your device's. If your computer's clock is wrong, so is that comparison.