The time difference between San Francisco and Seoul is 16 hours. When it is 12:00 noon in San Francisco, it is 04:00 in Seoul. San Francisco uses the America/Los_Angeles time zone (UTC-7), while Seoul uses Asia/Seoul (UTC+9).
| Detail | San Francisco | Seoul |
|---|---|---|
| Time Zone ID | America/Los_Angeles | Asia/Seoul |
| UTC Offset | UTC-7 | UTC+9 |
| Abbreviation | PDT | KST |
| DST Active | Yes — currently observing | No |
| Country | United States | South Korea |
| Region | North America | Asia |
With a 16 hours gap, there is no standard business-hours overlap between San Francisco and Seoul. 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 San Francisco time to Seoul time. Rows highlighted in green indicate overlapping business hours in both cities.
| San Francisco | Seoul | |
|---|---|---|
| 00:00 | 16:00 | Night |
| 01:00 | 17:00 | Night |
| 02:00 | 18:00 | Night |
| 03:00 | 19:00 | Night |
| 04:00 | 20:00 | Night |
| 05:00 | 21:00 | Night |
| 06:00 | 22:00 | |
| 07:00 | 23:00 | |
| 08:00 | 00:00 (+1 day) | |
| 09:00 | 01:00 (+1 day) | |
| 10:00 | 02:00 (+1 day) | |
| 11:00 | 03:00 (+1 day) | |
| 12:00 | 04:00 (+1 day) | |
| 13:00 | 05:00 (+1 day) | |
| 14:00 | 06:00 (+1 day) | |
| 15:00 | 07:00 (+1 day) | |
| 16:00 | 08:00 (+1 day) | |
| 17:00 | 09:00 (+1 day) | |
| 18:00 | 10:00 (+1 day) | |
| 19:00 | 11:00 (+1 day) | |
| 20:00 | 12:00 (+1 day) | |
| 21:00 | 13:00 (+1 day) | |
| 22:00 | 14:00 (+1 day) | Night |
| 23:00 | 15:00 (+1 day) | Night |
San Francisco is currently observing daylight saving time, while Seoul is on standard time. When San Francisco switches back to standard time, the difference between these two cities will shift by 1 hour.
The time difference is 16 hours. Seoul is 16 hours ahead of San Francisco.
Yes. One of these cities observes DST while the other does not, so the difference shifts by 1 hour when DST begins or ends.
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.
Add 16 hours to San Francisco time to get Seoul 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.