Most of the year, Seoul is 16 hours ahead of San Francisco. During Jan 1–Mar 7, Nov 1–Dec 31, Seoul is 17 hours ahead of San Francisco.
| San Francisco | Seoul Most of the year | Seoul Jan 1–Mar 7, Nov 1–Dec 31 |
|---|---|---|
| 12 AM | 4 PM | 5 PM |
| 1 AM | 5 PM | 6 PM |
| 2 AM | 6 PM | 7 PM |
| 3 AM | 7 PM | 8 PM |
| 4 AM | 8 PM | 9 PM |
| 5 AM | 9 PM | 10 PM |
| 6 AM | 10 PM | 11 PM |
| 7 AM | 11 PM | 12 AMnext day |
| 8 AM | 12 AMnext day | 1 AMnext day |
| 9 AM | 1 AMnext day | 2 AMnext day |
| 10 AM | 2 AMnext day | 3 AMnext day |
| 11 AM | 3 AMnext day | 4 AMnext day |
| 12 PM | 4 AMnext day | 5 AMnext day |
| 1 PM | 5 AMnext day | 6 AMnext day |
| 2 PM | 6 AMnext day | 7 AMnext day |
| 3 PM | 7 AMnext day | 8 AMnext day |
| 4 PM | 8 AMnext day | 9 AMnext day |
| 5 PM | 9 AMnext day | 10 AMnext day |
| 6 PM | 10 AMnext day | 11 AMnext day |
| 7 PM | 11 AMnext day | 12 PMnext day |
| 8 PM | 12 PMnext day | 1 PMnext day |
| 9 PM | 1 PMnext day | 2 PMnext day |
| 10 PM | 2 PMnext day | 3 PMnext day |
| 11 PM | 3 PMnext day | 4 PMnext day |
San Francisco observes daylight saving time from Mar 8, 2026 to Nov 1, 2026, when clocks move forward one hour.
Seoul does not observe daylight saving time (DST), so its offset stays the same all year.
Most of the year, Seoul is 16 hours ahead of San Francisco. During Jan 1–Mar 7, Nov 1–Dec 31, Seoul is 17 hours ahead of San Francisco.
San Francisco observes daylight saving time from Mar 8, 2026 to Nov 1, 2026, when clocks move forward one hour. Seoul does not observe daylight saving time (DST), so its offset stays the same all year.
Most of the year: Both cities are in business hours at San Francisco 5 PM–6 PM (Seoul 9 AM (next day)–10 AM). Jan 1–Mar 7, Nov 1–Dec 31: Both cities are in business hours at San Francisco 4 PM–6 PM (Seoul 9 AM (next day)–11 AM).