Do not miss the previous date
A Seoul morning can still be the previous afternoon in San Francisco. Write the weekday and date beside each local time, especially when coordinating a Monday meeting. Pacific seasonal changes also move the difference, so a saved screenshot is not a replacement for a dated invitation.
Seoul, KR: Asia/Seoul (city ID: seoul).
San Francisco, US: America/Los_Angeles (city ID: san-francisco).
Does the difference change?
The destination-minus-source differences sampled on the 15th of each month in 2027 are −17h, −16h. These are dated examples, not a promise of fixed offsets or a complete historical range. A different reference date may have different rules.
| Source date | Seoul | San Francisco |
|---|---|---|
| 2027-01-16 | 10:00 Korean Standard Time | 2027-01-15 · 17:00 -1 day · Pacific Standard Time |
| 2027-07-16 | 10:00 Korean Standard Time | 2027-07-15 · 18:00 -1 day · Pacific Daylight Time |
Daylight-saving rules depend on the city and date. When a local hour is missing or repeated, the converter rejects it or asks which occurrence you mean. Rules can change politically; reconfirm far-future meetings.