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BlogHow it works

KST to EST Converter

Choose a date and a Seoul time to see the time in New York, Atlanta, Washington or Toronto. The converter applies EST or EDT depending on the date.

Korea Standard Time

KSTKorea Standard Time

ESTEastern Time

––:––

14 h

How far Seoul is ahead of New York in the US winter

From the second Sunday of March to the first Sunday of November the East Coast is on EDT and the gap is 13 h. Korea's clock stays the same all year.

Seoul to New York, hour by hour

KST timeKST · ESTKST · EDT
12:00 AM10:00 AM−1 previous day11:00 AM−1 previous day
1:00 AM11:00 AM−1 previous day12:00 PM−1 previous day
2:00 AM12:00 PM−1 previous day1:00 PM−1 previous day
3:00 AM1:00 PM−1 previous day2:00 PM−1 previous day
4:00 AM2:00 PM−1 previous day3:00 PM−1 previous day
5:00 AM3:00 PM−1 previous day4:00 PM−1 previous day
6:00 AM4:00 PM−1 previous day5:00 PM−1 previous day
7:00 AM5:00 PM−1 previous day6:00 PM−1 previous day
8:00 AM6:00 PM−1 previous day7:00 PM−1 previous day
9:00 AM7:00 PM−1 previous day8:00 PM−1 previous day
10:00 AM8:00 PM−1 previous day9:00 PM−1 previous day
11:00 AM9:00 PM−1 previous day10:00 PM−1 previous day
12:00 PM10:00 PM−1 previous day11:00 PM−1 previous day
1:00 PM11:00 PM−1 previous day12:00 AM
2:00 PM12:00 AM1:00 AM
3:00 PM1:00 AM2:00 AM
4:00 PM2:00 AM3:00 AM
5:00 PM3:00 AM4:00 AM
6:00 PM4:00 AM5:00 AM
7:00 PM5:00 AM6:00 AM
8:00 PM6:00 AM7:00 AM
9:00 PM7:00 AM8:00 AM
10:00 PM8:00 AM9:00 AM
11:00 PM9:00 AM10:00 AM
Every Seoul hour with the US Eastern time in both seasons. Times marked −1 are on the previous day in New York.

Korea's single, fixed offset

South Korea uses Korea Standard Time, UTC+9, across the whole country. It tried daylight saving several times, most recently in 1987 and 1988 around the Seoul Olympics, and has not used it since. Korea's longitude, about 127° east, would suggest a clock closer to UTC+8:30, and Korea did use that offset for some years before returning to UTC+9.

The US side moves twice a year under the rules overseen by the US Department of Transportation, so the whole change in this pair comes from America.

  1. Jan 1, 2026 – Mar 8, 2026KST UTC+9 · EST UTC−5Difference: −14 h
  2. Mar 8, 2026 – Nov 1, 2026KST UTC+9 · EDT UTC−4Difference: −13 h
  3. Nov 1, 2026 – Mar 14, 2027KST UTC+9 · EST UTC−5Difference: −14 h
  4. Mar 14, 2027 – Nov 7, 2027KST UTC+9 · EDT UTC−4Difference: −13 h
  5. Nov 7, 2027 – Jan 1, 2028KST UTC+9 · EST UTC−5Difference: −14 h

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

Calls between Seoul and the East Coast

The two working days do not overlap. Most teams settle on the Seoul evening and the New York morning: 9:00 PM KST is 7:00 AM EST or 8:00 AM EDT on the same day. The opposite choice, a Seoul early morning, is the New York evening of the previous day.

Live clocks for Seoul, Washington, DC and Toronto help when you need the time right now. For Los Angeles, see KST to PST.

Before you send a Seoul–New York invite

  • Add the weekday for both cities; they often differ.
  • Use EDT, not EST, between March and November.
  • Check recurring events after both US clock changes; the Seoul time of a fixed New York slot moves by one hour.
  • Say ET if you are not sure which season the meeting falls in.
  • Japan's numbers are the same: JST to EST.

KST to EST questions

What is the time difference between Seoul and New York?

Seoul is 14 hours ahead of New York while the US East Coast is on EST and 13 hours ahead while it is on EDT.

What time is it in New York at 8:00 PM in Seoul?

It is 6:00 AM the same day on EST and 7:00 AM on EDT.

Has Korea ever used summer time?

Not today. Korea used summer time in 1987 and 1988 but has kept UTC+9 all year since then.

How do I convert KST to EST quickly?

Subtract 14 hours (13 during US summer). If the result is negative, add 24 and move back one day.

Is Korea on the same time as Japan?

Yes. Korea Standard Time and Japan Standard Time are both UTC+9, so the Tokyo and Seoul clocks always match.