The time difference between San Jose and Seoul is 17 hours. When it is 12:00 noon in San Jose, it is 05:00 in Seoul. San Jose uses the America/Los_Angeles time zone (UTC-8), while Seoul uses Asia/Seoul (UTC+9).
With a 17 hours gap, there is no standard business-hours overlap between San Jose and Seoul. One party will need to adjust their schedule. Early mornings in Seoul or late evenings in San Jose tend to be the most practical compromise.
Use this table to quickly convert any hour from San Jose time to Seoul time. Rows highlighted in green indicate overlapping business hours in both cities.
| San Jose | Seoul | |
|---|---|---|
| 00:00 | 17:00 | Night |
| 01:00 | 18:00 | Night |
| 02:00 | 19:00 | Night |
| 03:00 | 20:00 | Night |
| 04:00 | 21:00 | Night |
| 05:00 | 22:00 | Night |
| 06:00 | 23:00 | |
| 07:00 | 00:00 (+1 day) | |
| 08:00 | 01:00 (+1 day) | |
| 09:00 | 02:00 (+1 day) | |
| 10:00 | 03:00 (+1 day) | |
| 11:00 | 04:00 (+1 day) | |
| 12:00 | 05:00 (+1 day) | |
| 13:00 | 06:00 (+1 day) | |
| 14:00 | 07:00 (+1 day) | |
| 15:00 | 08:00 (+1 day) | |
| 16:00 | 09:00 (+1 day) | Overlap |
| 17:00 | 10:00 (+1 day) | |
| 18:00 | 11:00 (+1 day) | |
| 19:00 | 12:00 (+1 day) | |
| 20:00 | 13:00 (+1 day) | |
| 21:00 | 14:00 (+1 day) | |
| 22:00 | 15:00 (+1 day) | Night |
| 23:00 | 16:00 (+1 day) | Night |
Neither San Jose nor Seoul 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. Seoul is 17 hours ahead of San Jose.
It can. If either San Jose or Seoul 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.
Add 17 hours to San Jose 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.