Time in South Korea — regions, cities and time zones

Current time in Seoul

South Korea uses Korea Standard Time, UTC+9, for the entire year. Seoul, the capital, shares it with every province and with Jeju Island. There is no daylight saving, so the offset is the same in every season.

One zone, mainland and islands alike

South Korea is compact — a peninsula plus offshore islands — and it uses a single time zone throughout. Busan in the southeast, Incheon on the west coast, Gangneung on the east and Jeju in the southern sea all read the same clock as Seoul. The IANA identifier is Asia/Seoul.

The peninsula's north also currently keeps UTC+9, so the two Koreas are on the same offset, though the border is not one anyone crosses casually.

Nine hours ahead, and what that does to your calendar

UTC+9 places South Korea firmly in the group of economies that finish their working day before Western Europe has properly started. This shapes practical scheduling more than any other fact about Korean time:

Same clock as Japan — Seoul and Tokyo read identically, which is unusual for two countries this significant to each other's trade. One hour ahead of China, which uses UTC+8 nationwide, and of Hong Kong, Taipei and Singapore.

Eight hours ahead of Central Europe in the European winter, seven in the European summer. Thirteen or fourteen hours ahead of New York, depending on US daylight saving — meaning the Korean morning is the previous evening in America.

One or two hours behind Sydney, depending on Australian daylight saving. Seoul and Tokyo share a clock but not a sunrise: Korea sits west of Japan inside the same offset, so Seoul's sun comes up later and its evenings run longer.

Daylight saving: tried, and not in force

South Korea does not currently observe daylight saving time. It has been used in the country's past, and it has been discussed since, but no seasonal change applies now. Anyone reading old records should be aware that historical Korean timestamps may not follow today's simple rule — which is exactly why the Asia/Seoul identifier is preferable to a hard-coded "+9". The identifier carries the country's offset history; the number does not.

The absence of daylight saving means the gap between Korea and Europe or North America changes twice a year through their transitions. A weekly call with London will move by an hour when Britain switches, even though nothing in Seoul has changed.

Living by the Korean clock

South Korea sits well north of the tropics, so day length varies substantially: summer brings early sunrises and long light, winter brings early darkness. Because the country is in the western part of its zone, sunset falls later on the clock than the offset alone would suggest, which softens winter afternoons a little.

Some practical notes: Write "15:00 KST (UTC+9)". KST is widely used and understood, but the offset removes doubt. For markets and business, expect the Korean day to overlap Australia's afternoon, Europe's early morning, and none of the American working day.

When scheduling across the date line to the Americas, name the date explicitly — Tuesday morning in Seoul is Monday afternoon in California. In software, use Asia/Seoul and store instants in UTC.