Korea Standard Time and cross-Pacific dates
Seoul currently uses Korea Standard Time, UTC+9, without daylight saving. Tokyo has the same current local time, while Beijing, Hong Kong and Singapore are one hour behind. Historical conversions still use each city's own time-zone rules.
A morning call from Seoul to the United States may fall on the previous date there. New York's seasonal changes also alter the time difference. Read the date alongside the hour before confirming an event, game session, or family call.
Upcoming clock changes in Seoul
No clock change is scheduled in the next 12 months according to the time-zone rules available when this page was opened. Other cities may still change their clocks, so check the date of an international meeting.
Calculated on Oct 19, 2026 from available IANA rules. Governments can revise future rules; refresh this page for an updated calculation.
When it is 09:00 in Seoul
These two dated examples show how the same morning appointment can translate across the year. Each cell includes the destination date, in 24-hour time.
| Destination | January 15, 2026 | July 15, 2026 |
|---|---|---|
| New York | 19:00Jan 14, 2026 | 20:00Jul 14, 2026 |
| Tokyo | 09:00Jan 15, 2026 | 09:00Jul 15, 2026 |
Convert your own date from Seoul. The examples are individual instants, not a fixed year-round difference or a recommendation of working hours.
Reference: IANA: Asian time-zone rules. Guide reviewed September 28, 2026. Method and accuracy.