In the graph below you see the time zone difference between Korea Standard Time and Greenwich Mean Time. Drag the bubble to adjust the time and to see the corresponding time in the other time zone.
Korea Standard Time is the time zone of Korea, including cities like Seoul and Busan. Greenwich Mean Time is the time zone of the 0 meridian, located in London, United Kingdom, with places like London, Lisbon and Dublin (in the winter).
Usually it is preferable to schedule meetings in the late afternoon for the person in KST and before lunch for the person in GMT.
Korean Standard Time, or KST for short, is the standard time zone for South Korea. It is 9 hours ahead of UTC. North Korea was on KST until 2015 when they introduced their own Pyongyang Standard Time, which is 30 minutes behind Korean Standard Time.
South Korea is the only country using Korean Standard Time. It is however the same time as JST – Japan Standard Time and AWDT – Australian Western Daylight Time (i.e. when Western Australia applies Daylight Saving Time). As noted above, North Korea are since 2015 using their own time zone.
All cities in Korea applies KST, including Seoul, Busan, Incheon, Daegu, Daejeon, Suwon and Gwangju.
DST (Daylight Saving Time) is currently not applied in South Korea, although there were experiments during the 1988 Olympics.
GMT, or Greenwich Mean Time, is the zero when it comes to time zones – they are all counted from the zero meridian that runs through the village of Greenwich.
While both the UK and Portugal are officially on GMT you need to pay attention to whether they are actually observing it or are using their own. Britain in the summer for example use British Summer Time – which is different than GMT.
London, Lisbon, Dublin, Edinburgh
GMT does not observe DST as it is the zero hour time zone – it never changes.