Best Meeting Time: New York to Seoul
🕐 Live Timezone Overlap: New York & Seoul
New York and Seoul sit 13 hours apart, and their standard working days share zero overlap. A 9am start in New York lands at 10pm in Seoul. That single fact shapes every scheduling decision between the two cities: one side will always be outside office hours, and someone will need to compromise.
Working Across New York and Seoul
The pairing of New York and Seoul is most common in finance, technology, consumer electronics, and entertainment. South Korean conglomerates with US listings or investor relations teams in Manhattan need regular contact with headquarters in Seoul. Fund managers on Wall Street who hold positions in Korean equities, or who trade on the Korea Exchange, regularly coordinate with counterparts who are already well into their afternoon by the time the NYSE opens at 9:30am ET. On the technology side, hardware suppliers, semiconductor manufacturers, and platform companies based in Seoul maintain product and partnership teams that report into New York offices. The Korean Wave has also pulled entertainment lawyers, talent agencies, and streaming platform teams based in New York into frequent calls with Korean labels and production houses in Seoul. At the office level, Seoul firms commonly run 9am to 6pm, though many extend beyond that in practice. Working hours are legally capped at 52 per week since 2018, but the culture in many firms still runs long. New York's rhythm is set by the NYSE open at 9:30am ET; finance teams are typically at their desks early, and the 4 to 6pm window is often consumed by client calls that bridge into European time zones. Neither city has much slack in its core day for the other.
Time Difference: New York and Seoul
Seoul is currently 13 hours ahead of New York. The live offsets are New York UTC-4 and Seoul UTC+9. New York observes daylight saving and Seoul does not, so the offset shifts twice a year if both sides aren't already aligned.
Seoul runs UTC+9 year-round. South Korea does not observe DST. New York observes DST, moving from UTC-5 in standard time to UTC-4 in summer. That means the gap between New York and Seoul is not fixed. In standard time (roughly November to March), New York is 14 hours behind Seoul. When the US shifts to EDT in spring, the gap narrows to 13 hours, because New York moves one hour closer to Seoul. When the US reverts to EST in autumn, the gap widens back to 14 hours. The changeover dates matter: the US typically moves its clocks forward on the second Sunday in March and back on the first Sunday in November. Because Seoul never moves, the gap shifts on those exact weekends. A recurring weekly call set at a fixed Seoul time will arrive one hour earlier in New York for the summer months. Anyone with a standing meeting should audit their calendar invites at both changeover weekends to avoid a silent one-hour drift.
Best Times to Meet
There is no overlap between New York business hours (9am to 6pm ET) and Seoul business hours (9am to 6pm KST). Every meeting requires one side to step outside its working day. The most common compromise is early morning in New York paired with evening in Seoul. An 8am call in New York corresponds to 9pm or 10pm in Seoul depending on the season: 9pm in summer (EDT, 13-hour gap) and 10pm in winter (EST, 14-hour gap). Seoul-side participants should expect to be home or finishing dinner before dialling in. The reverse is also used: a 7am New York call is 8pm or 9pm in Seoul, which is less disruptive for the Seoul side. Late-afternoon New York slots, say 5pm or 6pm ET, land at 6am or 7am the following morning in Seoul, which many professionals find more manageable than late-night calls. For the Seoul team, early morning the following calendar day is often preferable to staying online past 9pm. The day boundary always needs to be stated explicitly in invites for this pair.
These examples use current offsets: EDT (UTC-4) and KST (UTC+9), a 13-hour gap. 8am Monday in New York = 9pm Monday in Seoul. 12pm (noon) Monday in New York = 1am Tuesday in Seoul. This crosses midnight and is rarely practical for the Seoul side. 6pm Monday in New York = 7am Tuesday in Seoul. This is one of the cleaner options: end of business in New York, early morning in Seoul before the office fills. In standard time (EST, UTC-5), add one hour to each Seoul result: 8am Monday New York becomes 10pm Monday Seoul.
Working Hours Overlap Explained
New York operates on America/New_York (currently UTC-4). Seoul operates on Asia/Seoul (currently UTC+9). The table below maps a standard 9:00 AM–6:00 PM day in New York to Seoul's local time.
| New York time | Seoul time | Status |
|---|---|---|
| 9:00 AM | 10:00 PM | Seoul outside hours |
| 10:00 AM | 11:00 PM | Seoul outside hours |
| 11:00 AM | 12:00 AM | Seoul outside hours |
| 12:00 PM | 1:00 AM | Seoul outside hours |
| 1:00 PM | 2:00 AM | Seoul outside hours |
| 2:00 PM | 3:00 AM | Seoul outside hours |
| 3:00 PM | 4:00 AM | Seoul outside hours |
| 4:00 PM | 5:00 AM | Seoul outside hours |
| 5:00 PM | 6:00 AM | Seoul outside hours |
| 6:00 PM | 7:00 AM | Seoul outside hours |
Tips for Scheduling Across New York and Seoul
- Seoul is always ahead: a Tuesday morning call in New York is Tuesday evening or even Wednesday morning in Seoul, so confirm the calendar day explicitly.
- The gap narrows from 14 hours to 13 when New York enters EDT each March; update any recurring Seoul calls on the second Sunday in March.
- Seollal and Chuseok shift dates every year with the lunar calendar; check the exact Korean holiday dates before scheduling Q1 or autumn series calls.
- A 6pm ET slot lands at 7am KST the following day, the least disruptive option for Seoul if the New York side can hold the call at day's end.
- Late Friday Seoul time is off-limits by convention; New York's Thursday afternoon proposals often land on a Friday evening in Seoul, so push to Thursday morning ET instead.
The 13-hour gap means that a meeting date in New York and a meeting date in Seoul are almost never the same calendar day. If the call is set for Tuesday at 7am New York time, Seoul's calendar shows Wednesday. This creates a persistent source of confusion in meeting invites. Always state both the local day and the local time for each city in the invite subject line or description: 'Tuesday 7am ET / Wednesday 8pm KST' removes ambiguity. Calendar tools that auto-convert times will show the correct hour but will not flag the day change in the way a human reads it. One missed day offset has derailed more than a few calls between these two cities.
Public Holidays and Working Weeks
Seoul's working week runs Monday through Friday, with Friday evenings often reserved for hoesik, the team dinner tradition that extends social ties within Korean firms. Business meetings scheduled late on a Friday in Seoul are uncommon, a point worth noting when the New York side proposes a Thursday-afternoon slot that lands Friday evening in Seoul. New York's finance-driven calendar means the 4 to 6pm ET window is typically busy with domestic and transatlantic calls; adding a Seoul call into that slot is possible but competes with existing commitments. On public holidays: Seoul shuts for Seollal (Lunar New Year, January or February) and Chuseok (September or October), both of which bring three to four days of national closures. The exact dates shift each year with the lunar calendar, so they need checking annually. New York's heaviest out-of-office periods are Independence Day on 4 July, Thanksgiving on the fourth Thursday in November, and the stretch from 24 December through 2 January. A Seoul team trying to reach New York in late November or late December should expect slow responses. Conversely, New York teams should not assume Seoul is fully operational during Seollal or Chuseok without confirming in advance.
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