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BlogHow it works

KST to PST Converter

Pick a date and a Seoul time to see the clock in Los Angeles, San Francisco or Seattle. The converter knows when the West Coast is on PST or PDT.

Korea Standard Time

KSTKorea Standard Time

PSTPacific Time

––:––

Seoul runs 17 hours ahead of the US West Coast in winter and 16 hours ahead in summer, so a Korean morning is the Californian afternoon before.

Seoul to Pacific Time table

KST timeKST · PSTKST · PDT
12:00 AM7:00 AM−1 previous day8:00 AM−1 previous day
1:00 AM8:00 AM−1 previous day9:00 AM−1 previous day
2:00 AM9:00 AM−1 previous day10:00 AM−1 previous day
3:00 AM10:00 AM−1 previous day11:00 AM−1 previous day
4:00 AM11:00 AM−1 previous day12:00 PM−1 previous day
5:00 AM12:00 PM−1 previous day1:00 PM−1 previous day
6:00 AM1:00 PM−1 previous day2:00 PM−1 previous day
7:00 AM2:00 PM−1 previous day3:00 PM−1 previous day
8:00 AM3:00 PM−1 previous day4:00 PM−1 previous day
9:00 AM4:00 PM−1 previous day5:00 PM−1 previous day
10:00 AM5:00 PM−1 previous day6:00 PM−1 previous day
11:00 AM6:00 PM−1 previous day7:00 PM−1 previous day
12:00 PM7:00 PM−1 previous day8:00 PM−1 previous day
1:00 PM8:00 PM−1 previous day9:00 PM−1 previous day
2:00 PM9:00 PM−1 previous day10:00 PM−1 previous day
3:00 PM10:00 PM−1 previous day11:00 PM−1 previous day
4:00 PM11:00 PM−1 previous day12:00 AM
5:00 PM12:00 AM1:00 AM
6:00 PM1:00 AM2:00 AM
7:00 PM2:00 AM3:00 AM
8:00 PM3:00 AM4:00 AM
9:00 PM4:00 AM5:00 AM
10:00 PM5:00 AM6:00 AM
11:00 PM6:00 AM7:00 AM
Each Seoul hour with the Pacific time in both US seasons. Most rows carry −1 because California is still on the previous day.

Daylight saving on one side only

South Korea has kept Korea Standard Time, UTC+9, without summer time since 1988. Pacific Time is UTC−8 as PST and UTC−7 as PDT. The US Department of Transportation oversees the switch at 2:00 AM local time on the second Sunday of March and the first Sunday of November.

The periods below show the exact stretches with a 17-hour and a 16-hour gap for this year and next. A meeting fixed in Seoul time therefore moves by an hour in California twice a year, while one fixed in California time moves in Seoul.

  1. Jan 1, 2026 – Mar 8, 2026KST UTC+9 · PST UTC−8Difference: −17 h
  2. Mar 8, 2026 – Nov 1, 2026KST UTC+9 · PDT UTC−7Difference: −16 h
  3. Nov 1, 2026 – Mar 14, 2027KST UTC+9 · PST UTC−8Difference: −17 h
  4. Mar 14, 2027 – Nov 7, 2027KST UTC+9 · PDT UTC−7Difference: −16 h
  5. Nov 7, 2027 – Jan 1, 2028KST UTC+9 · PST UTC−8Difference: −17 h

Offsets in 2026 – 2027, from the IANA time zone data in your browser's engine

Working across the Pacific

There is no shared daytime, so one side takes an early or late slot. The common choice is the Seoul morning: 8:00 AM KST is 3:00 PM the day before in Los Angeles on PST, or 4:00 PM on PDT. Engineering teams in the Bay Area often hand work to Seoul at the end of their day and pick up answers the next morning.

Mind the weekend: Monday 9:00 AM in Seoul is still Sunday afternoon in California. The Seoul, Seattle and Vancouver clocks show both sides now, and KST to EST covers the East Coast.

Do

  • Write the weekday for each city: Mon 9:00 AM KST / Sun 4:00 PM PDT.
  • Expect the Seoul slot to move an hour later after the November change.

Avoid

  • Sending a Friday-afternoon Pacific request and expecting a Saturday reply in Korea.
  • Using PST in July. California is on PDT then.

KST to PST questions

How far ahead of Los Angeles is Seoul?

Seoul is 17 hours ahead of Los Angeles on PST and 16 hours ahead on PDT, which runs from the second Sunday in March to the first Sunday in November.

What time is it in California at 10:00 AM in Seoul?

It is 5:00 PM the previous day on PST and 6:00 PM the previous day on PDT.

When can Seoul and San Francisco teams talk?

Most use the Seoul morning, 8:00–10:00 AM, which is the previous afternoon or early evening in California.

Why does the Seoul–LA gap change?

California moves its clocks forward in March and back in November. Korea keeps UTC+9 all year.

Is Tokyo to Los Angeles the same as Seoul to Los Angeles?

Yes. Japan and Korea share UTC+9, so the JST to PST numbers are identical.