KST to UTC
Coordinated Universal Time is 9 hours behind Korea Standard Time, all year round.
KST to UTC conversion table
Every hour of the day, Korea Standard Time to Coordinated Universal Time. The gap never changes, so this table holds on every date.
| KST | UTC |
|---|---|
| 12:00 AM | 3:00 PM −1 day |
| 1:00 AM | 4:00 PM −1 day |
| 2:00 AM | 5:00 PM −1 day |
| 3:00 AM | 6:00 PM −1 day |
| 4:00 AM | 7:00 PM −1 day |
| 5:00 AM | 8:00 PM −1 day |
| 6:00 AM | 9:00 PM −1 day |
| 7:00 AM | 10:00 PM −1 day |
| 8:00 AM | 11:00 PM −1 day |
| 9:00 AM | 12:00 AM |
| 10:00 AM | 1:00 AM |
| 11:00 AM | 2:00 AM |
| KST | UTC |
|---|---|
| 12:00 PM | 3:00 AM |
| 1:00 PM | 4:00 AM |
| 2:00 PM | 5:00 AM |
| 3:00 PM | 6:00 AM |
| 4:00 PM | 7:00 AM |
| 5:00 PM | 8:00 AM |
| 6:00 PM | 9:00 AM |
| 7:00 PM | 10:00 AM |
| 8:00 PM | 11:00 AM |
| 9:00 PM | 12:00 PM |
| 10:00 PM | 1:00 PM |
| 11:00 PM | 2:00 PM |
Shared working hours
They do not overlap at all. A 09:00–17:00 working day in Korea Standard Time ends 1 hour before the Coordinated Universal Time one begins, so any live call sits outside somebody's working hours.
The shortest reach is the edges: early morning in KST against late evening in UTC, or the other way round.
When the difference changes
It doesn't. Coordinated Universal Time is 9 hours behind Korea Standard Time on every date of the year. Korea Standard Time runs at UTC+09:00; Coordinated Universal Time runs at UTC+00:00.
About Korea Standard Time
Korea is a fixed UTC+9, the same clock as Japan. Daylight saving was last used for the 1988 Olympics and has not returned.
Cities on this clock: Tokyo, Osaka, Seoul.
About Coordinated Universal Time
UTC never shifts. It is the reference every other zone is defined against, which is why logs, flight schedules and protocol timestamps use it. GMT is the same clock for every civil purpose, so a query for one is answered by the other.
Cities on this clock: Reykjavik, Accra, Abidjan, Dakar.
Watch out: GMT is also used loosely to mean "UK time", and those are not the same thing for seven months of the year — the United Kingdom moves to BST (UTC+1) while UTC stays put.
How the difference is worked out
Neither Korea Standard Time nor Coordinated Universal Time moves its clock relative to the other, so coordinated universal time is 9 hours behind korea standard time is a rule rather than a fact about one particular year. The hour-by-hour table above holds on every date.
With both zones on their own standard time — daylight saving not in force anywhere — Coordinated Universal Time is 9 hours behind Korea Standard Time. That figure never changes; everything else on this page follows from it plus whichever clocks have moved.
Every figure here comes from the IANA time zone database via your browser's own Intl engine, using the zone ids Asia/Seoul and UTC. Nothing is looked up on a server and nothing about your visit is recorded.
Is UTC ahead of or behind KST?
Coordinated Universal Time is 9 hours behind Korea Standard Time, all year round. Korea Standard Time runs at UTC+09:00; Coordinated Universal Time runs at UTC+00:00. Because neither zone changes its clock, the gap never moves.
What time is 9 AM KST in UTC?
9:00 AM KST is 12:00 AM UTC.
When can Korea Standard Time and Coordinated Universal Time meet?
They do not overlap. A 09:00–17:00 working day in Korea Standard Time ends 1 hour before the Coordinated Universal Time one begins, so a call has to sit outside someone's working hours — early morning in Korea Standard Time or late evening in Coordinated Universal Time is usually the shortest reach.
What does KST stand for?
KST is Korea Standard Time, also written Seoul time, Korea time. Korea is a fixed UTC+9, the same clock as Japan. Daylight saving was last used for the 1988 Olympics and has not returned.