The time difference between Seoul and San Francisco is 17 hours. When it is 12:00 noon in Seoul, it is 19:00 in San Francisco. Seoul uses the Asia/Seoul time zone (UTC+9), while San Francisco uses America/Los_Angeles (UTC-8).
| Detail | Seoul | San Francisco |
|---|---|---|
| Time Zone ID | Asia/Seoul | America/Los_Angeles |
| UTC Offset | UTC+9 | UTC-8 |
| Abbreviation | KST | PST |
| DST Active | No | No |
| Country | South Korea | United States |
| Region | Asia | North America |
With a 17 hours gap, there is no standard business-hours overlap between Seoul and San Francisco. One party will need to adjust their schedule. Early mornings in Seoul or late evenings in San Francisco tend to be the most practical compromise.
Use this table to quickly convert any hour from Seoul time to San Francisco time. Rows highlighted in green indicate overlapping business hours in both cities.
| Seoul | San Francisco | |
|---|---|---|
| 00:00 | 07:00 (-1 day) | Night |
| 01:00 | 08:00 (-1 day) | Night |
| 02:00 | 09:00 (-1 day) | Night |
| 03:00 | 10:00 (-1 day) | Night |
| 04:00 | 11:00 (-1 day) | Night |
| 05:00 | 12:00 (-1 day) | Night |
| 06:00 | 13:00 (-1 day) | |
| 07:00 | 14:00 (-1 day) | |
| 08:00 | 15:00 (-1 day) | |
| 09:00 | 16:00 (-1 day) | Overlap |
| 10:00 | 17:00 (-1 day) | |
| 11:00 | 18:00 (-1 day) | |
| 12:00 | 19:00 (-1 day) | |
| 13:00 | 20:00 (-1 day) | |
| 14:00 | 21:00 (-1 day) | |
| 15:00 | 22:00 (-1 day) | |
| 16:00 | 23:00 (-1 day) | |
| 17:00 | 00:00 | |
| 18:00 | 01:00 | |
| 19:00 | 02:00 | |
| 20:00 | 03:00 | |
| 21:00 | 04:00 | |
| 22:00 | 05:00 | Night |
| 23:00 | 06:00 | Night |
Neither Seoul nor San Francisco is currently observing daylight saving time. If either city observes DST, the time difference will change by 1 hour when DST begins or ends. Always double-check before scheduling across these time zones during March–April and October–November.
The time difference is 17 hours. San Francisco is 17 hours behind Seoul.
It can. If either Seoul or San Francisco observes daylight saving time, the gap will shift by 1 hour during the transition periods (typically March–April and October–November).
There is no ideal window during standard business hours. Consider scheduling at the edges — early morning for the city that is ahead and late afternoon for the city that is behind.
Subtract 17 hours from Seoul time to get San Francisco time. Use the hour-by-hour table above for a quick reference.
For sunrise and sunset data, visit TheSunsetTimes.com. For detailed DST schedules, see DaylightSavingTime.info.