South Korea is in the Korea Standard Time zone; North Korea is also in this time zone. There is a difference of nine hours between KST and Universal Time Coordinated, which is the same as Greenwich Mean Time. KST is ahead of UTC.
KST is not the only world time zone that is nine hours ahead of UTC. Others time zones in this group include Japan Standard Time, or JST; Eastern Indonesian Time, or WIT; and Australian Western Daylight Time, or AWDT.
KST has been nine hours ahead of UTC since 1961. South Korea does not observe daylight savings time.