Historically distinct IANA time zone
Asia/Seoul
Local time now
KST · current offset
- Countries
- South Korea
- GPS reference
- 37.55° N, 126.97° E
- Data source
- IANA asia
- Aliases
- ROK
- Rule groups
South KoreaGeographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 37.55° N, 126.97° E. Associated countries: KR.
The Wikipedia link provides additional context; it is not evidence for a historical claim. Transition data comes from the IANA source file.
A shared present
Same clock today, different past
These nearby zones follow the same current annual pattern, yet retain their own historical record.
North Korea · 195 km from the reference location · Same annual clock since 2019Civil-time record
Recorded changes over time
From 1908 to 1988 · 29 recorded transitions
Recurring daylight-saving changes are grouped separately when JavaScript is available.
Notable changes
One-off changes and transitions outside the recurring seasonal rhythm.
- +08:30 · KSTStandard time applies
- +09:00 · JSTStandard time applies
- +09:00 · KSTStandard time applies
- +10:00 · KDTDaylight saving time begins
- +09:00 · KSTStandard time applies
- +10:00 · KDTDaylight saving time begins
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1908-04-01 00:02 | +08:30 | KST | Standard time |
| 1912-01-01 00:30 | +09:00 | JST | Standard time |
| 1945-09-08 00:00 | +09:00 | KST | Standard time |
| 1948-06-01 01:00 | +10:00 | KDT | Daylight saving time |
| 1948-09-12 23:00 | +09:00 | KST | Standard time |
| 1949-04-03 01:00 | +10:00 | KDT | Daylight saving time |
| 1949-09-10 23:00 | +09:00 | KST | Standard time |
| 1950-04-01 01:00 | +10:00 | KDT | Daylight saving time |
| 1950-09-09 23:00 | +09:00 | KST | Standard time |
| 1951-05-06 01:00 | +10:00 | KDT | Daylight saving time |
| 1951-09-08 23:00 | +09:00 | KST | Standard time |
| 1954-03-20 23:30 | +08:30 | KST | Standard time |
| 1955-05-05 01:00 | +09:30 | KDT | Daylight saving time |
| 1955-09-08 23:00 | +08:30 | KST | Standard time |
| 1956-05-20 01:00 | +09:30 | KDT | Daylight saving time |
| 1956-09-29 23:00 | +08:30 | KST | Standard time |
| 1957-05-05 01:00 | +09:30 | KDT | Daylight saving time |
| 1957-09-21 23:00 | +08:30 | KST | Standard time |
| 1958-05-04 01:00 | +09:30 | KDT | Daylight saving time |
| 1958-09-20 23:00 | +08:30 | KST | Standard time |
| 1959-05-03 01:00 | +09:30 | KDT | Daylight saving time |
| 1959-09-19 23:00 | +08:30 | KST | Standard time |
| 1960-05-01 01:00 | +09:30 | KDT | Daylight saving time |
| 1960-09-17 23:00 | +08:30 | KST | Standard time |
| 1961-08-10 00:30 | +09:00 | KST | Standard time |
| 1987-05-10 03:00 | +10:00 | KDT | Daylight saving time |
| 1987-10-11 02:00 | +09:00 | KST | Standard time |
| 1988-05-08 03:00 | +10:00 | KDT | Daylight saving time |
| 1988-10-09 02:00 | +09:00 | KST | Standard time |