Seoul to New York time
Convert times between Seoul (KST) and New York (EST/EDT) with daylight saving handled automatically by date, and line up meetings and calls at a glance.
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How many hours apart are Seoul and New York?
Seoul runs on KST (UTC+9) and observes no daylight saving time, so its clock never moves. New York switches twice a year: Eastern Standard Time (EST, UTC-5) in winter and Eastern Daylight Time (EDT, UTC-4) in summer. That makes Seoul 13 hours ahead in summer and 14 hours ahead in winter. The gap isn't a fixed number — because Korea stays put while the US springs forward and falls back, the difference shifts by one hour each time American clocks change. Seoul is always the city that's ahead, so it's already tomorrow there while New York is still on the previous day.
Worked examples: 9 AM in each city
Here's how it plays out. 9 AM in Seoul is 8 PM the previous day in New York during summer (EDT), or 7 PM the previous day in winter (EST). Going the other way, 9 AM in New York lands at 10 PM the same day in Seoul in summer, and 11 PM in winter. Translate a New York workday (9 AM to 5 PM) into Seoul time and you get roughly 10 PM to 6 AM in summer, or 11 PM to 7 AM in winter — so a late Seoul evening is usually your best shot at a live overlap.
Planning calls, flights, and live streams
Once you know the gap, it's far easier to book a video call, estimate when a nonstop Incheon–JFK flight actually lands, catch a US sports game or live stream at the right moment, or reach family and support desks while they're awake. The converter above reads the exact date you choose, checks whether New York is on daylight time that day, and applies the correct 13- or 14-hour offset for you. That matters most in the early-March and early-November changeover weeks, when doing the math by hand is easy to get wrong by an hour.
Frequently asked questions
How many hours ahead is Seoul of New York?
Seoul is ahead. It's 13 hours ahead in summer, when the US is on daylight time, and 14 hours ahead in winter, when New York is on standard time.
Why does the difference switch between 13 and 14 hours?
Because the US observes daylight saving time and Korea does not. From the second Sunday in March to the first Sunday in November (March 8 to November 1 in 2026), New York is on EDT and the gap is 13 hours; the rest of the year it's on EST and the gap is 14 hours.
What time is 9 AM in Seoul over in New York?
It's 8 PM the previous day in summer (EDT) and 7 PM the previous day in winter (EST). Since it depends on the date's DST status, check the exact day with the converter above.