Time Difference Between San Francisco and Seoul
Seoul is 17h ahead of San Francisco in standard time, and 16h ahead while San Francisco is on daylight saving time.
San Francisco clocks move forward on the second Sunday of March and back on the first Sunday of November. Seoul keeps the same clock all year. The figures above cover each part of the year. They do not come from the offset on the day the site was built. The live clocks use the current time.
Working Hours Overlap
For each hour of San Francisco's working day (9:00-18:00), here is the corresponding local time in Seoul. Rows highlighted green fall within standard working hours (9:00-18:00) in both cities. Each block is one part of the year, so the table does not change with the day this page was built.
17h ahead (standard time)
| San Francisco | Seoul | Both working hours? |
|---|---|---|
| 9 AM | 2 AM | No |
| 10 AM | 3 AM | No |
| 11 AM | 4 AM | No |
| 12 PM | 5 AM | No |
| 1 PM | 6 AM | No |
| 2 PM | 7 AM | No |
| 3 PM | 8 AM | No |
| 4 PM | 9 AM | Yes |
| 5 PM | 10 AM | Yes |
| 6 PM | 11 AM | No |
16h ahead (daylight saving time in San Francisco, while Seoul is on standard time)
| San Francisco | Seoul | Both working hours? |
|---|---|---|
| 9 AM | 1 AM | No |
| 10 AM | 2 AM | No |
| 11 AM | 3 AM | No |
| 12 PM | 4 AM | No |
| 1 PM | 5 AM | No |
| 2 PM | 6 AM | No |
| 3 PM | 7 AM | No |
| 4 PM | 8 AM | No |
| 5 PM | 9 AM | Yes |
| 6 PM | 10 AM | No |
Best Time to Meet
17h ahead (standard time)
- 4 PM-6 PM in San Francisco (9 AM-11 AM in Seoul) works for both sides. It falls within 9 AM-6 PM in both time zones.
16h ahead (daylight saving time in San Francisco, while Seoul is on standard time)
- 5 PM-6 PM in San Francisco (9 AM-10 AM in Seoul) works for both sides. It falls within 9 AM-6 PM in both time zones.
How the Difference Changes
Only San Francisco changes its clocks, so the gap is not one number. The rules are above. The dates for the year you are reading this page load below.
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San Francisco
San Francisco uses the America/Los_Angeles time zone. Standard time is UTC-8, and daylight saving time is UTC-7.
Seoul
Seoul uses the Asia/Seoul time zone, at UTC+9 all year. This zone does not observe daylight saving time.