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Time difference between San Francisco and Seoul
San Francisco
—
Seoul
—
Seoul is 16 hours ahead of San Francisco right now.
Does the gap change?
The gap isn't fixed. San Francisco changes its clocks for daylight saving time and Seoul doesn't, so the difference moves during the year:
- From around November 2, 2026: Seoul ahead by 17 hours
- From around March 15, 2027: Seoul ahead by 16 hours
Best time to meet
Normal office hours in Seoul and San Francisco don't overlap. The most workable window is 3 PM to 10 PM in San Francisco, which is 7 AM to 2 PM in Seoul, with one side starting early or finishing late.
For a recurring meeting, it's fairest to rotate which city takes the inconvenient slot.
City details
San Francisco to Seoul, hour by hour
| San Francisco | Seoul | ||
|---|---|---|---|
| 12 AM | Night | 4 PM | Work hours |
| 1 AM | Night | 5 PM | Early or late |
| 2 AM | Night | 6 PM | Early or late |
| 3 AM | Night | 7 PM | Early or late |
| 4 AM | Night | 8 PM | Early or late |
| 5 AM | Night | 9 PM | Early or late |
| 6 AM | Night | 10 PM | Night |
| 7 AM | Early or late | 11 PM | Night |
| 8 AM | Early or late | 12 AM (Thu) | Night |
| 9 AM | Work hours | 1 AM (Thu) | Night |
| 10 AM | Work hours | 2 AM (Thu) | Night |
| 11 AM | Work hours | 3 AM (Thu) | Night |
| 12 PM | Work hours | 4 AM (Thu) | Night |
| 1 PM | Work hours | 5 AM (Thu) | Night |
| 2 PM | Work hours | 6 AM (Thu) | Night |
| 3 PM | Work hours | 7 AM (Thu) | Early or late |
| 4 PM | Work hours | 8 AM (Thu) | Early or late |
| 5 PM | Early or late | 9 AM (Thu) | Work hours |
| 6 PM | Early or late | 10 AM (Thu) | Work hours |
| 7 PM | Early or late | 11 AM (Thu) | Work hours |
| 8 PM | Early or late | 12 PM (Thu) | Work hours |
| 9 PM | Early or late | 1 PM (Thu) | Work hours |
| 10 PM | Night | 2 PM (Thu) | Work hours |
| 11 PM | Night | 3 PM (Thu) | Work hours |
Based on today's clocks. Work hours are 9 AM to 5 PM.