Quick answer
A practical time to call South Korea from California is about 4:00 PM–8:00 PM California time while California is on daylight saving time. That corresponds to about 8:00 AM–12:00 PM in South Korea the next day.
| California (PDT) | South Korea (KST) |
|---|---|
| 4:00 PM | 8:00 AM next day |
| 5:00 PM | 9:00 AM next day |
| 6:00 PM | 10:00 AM next day |
| 7:00 PM | 11:00 AM next day |
| 8:00 PM | 12:00 PM next day |
This table applies while California is on Pacific Daylight Time (PDT, UTC−7). South Korea remains on Korea Standard Time (KST, UTC+9) year-round.
How many hours ahead is South Korea?
South Korea does not currently change its clocks for daylight saving time, but California does. Therefore the time difference changes during the year.
- California on PDT (UTC−7): South Korea is 16 hours ahead.
- California on PST (UTC−8): South Korea is 17 hours ahead.
What changes during California standard time?
When California returns to Pacific Standard Time, the same Korean morning occurs one hour earlier in California.
| California (PST) | South Korea (KST) |
|---|---|
| 3:00 PM | 8:00 AM next day |
| 4:00 PM | 9:00 AM next day |
| 5:00 PM | 10:00 AM next day |
| 6:00 PM | 11:00 AM next day |
| 7:00 PM | 12:00 PM next day |
Best time for family and friends
If the person in South Korea is comfortable receiving a morning call, California late afternoon or early evening is usually convenient. A simple rule to remember is:
California afternoon/evening → Korea next morning.
If the person in Korea prefers an evening call instead, the California caller would usually need to call very early in the morning, which is less convenient for many people.
Best time for business calls
For business calls, targeting roughly 9:00 AM–12:00 PM in South Korea usually means approximately 5:00 PM–8:00 PM California time during PDT, or 4:00 PM–7:00 PM during PST.
For a specific date, use the calculator below because California's daylight-saving status affects the answer.
Try the Best Time to Call Calculator
Frequently asked questions
Is South Korea ahead of California?
Yes. South Korea is generally 16 hours ahead when California is on PDT and 17 hours ahead when California is on PST.
Does South Korea use daylight saving time?
No. South Korea currently uses Korea Standard Time (UTC+9) throughout the year.
If it is 6:00 PM in California, what time is it in South Korea?
When California is on PDT, 6:00 PM in California is 10:00 AM the next day in South Korea. When California is on PST, it is 11:00 AM the next day.
Is Seoul the same time as the rest of South Korea?
Yes. South Korea uses one national time zone, Korea Standard Time (KST, UTC+9).
What is the easiest rule to remember?
During California daylight time, add 16 hours. During California standard time, add 17 hours. Because the date often changes, use a date-specific calculator for important calls or meetings.