Best Meeting Time: Seoul to New York
🕐 Live Timezone Overlap: Seoul & New York
Seoul and New York sit 13 hours apart, which means the two cities share no overlap within standard 9am-6pm working hours. Every meeting between them requires at least one side to start early or finish late. That constraint is not occasional. It is permanent, and anyone scheduling across these two cities regularly needs a clear system for managing it.
Working Across Seoul and New York
The Seoul-New York corridor is active across several sectors. South Korean conglomerates, known as chaebol, have long-standing ties with US capital markets: Samsung, Hyundai, LG, and SK all have investor relations, treasury, or legal functions that require regular contact with New York counterparts. The NYSE opens at 9:30am ET, which is 10:30pm Seoul time, meaning Korean teams tracking US equity listings often work into the night during earnings seasons or roadshows. Beyond large corporates, the entertainment and intellectual property sector has grown significantly. Korean media companies and their US distribution or licensing partners in New York routinely coordinate contracts, release schedules, and rights negotiations across the time gap. Fashion and retail buying also brings Seoul designers and New York showrooms into regular contact, particularly around seasonal collection timelines. On the financial side, Korean asset managers and pension funds with US dollar-denominated holdings need to speak with New York brokers and custodians. That conversation almost always happens at the edges of one city's day. In Seoul, the working week pattern is 9am-6pm by the common standard, though many firms extend hours well beyond that, particularly in finance and tech. New York's business rhythm is set in large part by the NYSE open at 9:30am ET. The practical result: Seoul teams that need to reach New York during New York business hours are doing so between roughly 10pm and 7am Seoul time.
Time Difference: Seoul and New York
New York is currently 13 hours behind Seoul. The live offsets are Seoul UTC+9 and New York UTC-4. Seoul does not observe daylight saving and New York observes daylight saving, 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 daylight saving time, so the offset never changes. New York observes US DST, moving from UTC-5 in standard time to UTC-4 in summer. During Eastern Standard Time (November to mid-March), the gap between Seoul and New York is 14 hours: Seoul is 14 hours ahead. During Eastern Daylight Time (mid-March to early November), that gap narrows to 13 hours, because New York moves its clocks forward by one hour. The changeover weekend matters. When the US switches to EDT in mid-March, the gap narrows from 14 to 13 hours overnight. In early November, when the US reverts to EST, it widens again from 13 to 14 hours. Seoul is unaffected either time. There is no equivalent European complication here because neither city aligns its schedule to the EU clock change. The practical effect: a standing meeting booked for 9am New York time will shift by one local Seoul hour twice a year, even though nothing changes on the Seoul calendar.
Best Times to Meet
With zero hours of standard overlap between Seoul and New York, every meeting requires a compromise. The most common workable slot is early morning in New York paired with late evening in Seoul. An 8am or 9am New York start during EDT corresponds to 9pm or 10pm in Seoul. During EST, those same New York times land at 10pm or 11pm Seoul time, which is harder to sustain regularly. For Seoul-side teams, the slightly more tolerable direction is late afternoon: a 6pm Seoul meeting lands at 4am or 5am in New York, which is not realistic for most New York counterparts. The asymmetry means New York generally carries less burden, as early morning is easier to schedule than late night. A 7am New York start is unconventional but achievable for finance teams, given that some desks are active before the 9:30am NYSE open. That 7am ET slot corresponds to 8pm Seoul time during EDT, or 9pm during EST. Of those, 8pm Seoul is the more sustainable ask. Build the recurring slot around EDT periods where possible.
These conversions use the current UTC offset: Seoul UTC+9, New York UTC-4 (EDT). 9am Monday in Seoul = 8pm Sunday in New York. A morning start in Seoul falls on the prior evening in New York. 1pm Monday in Seoul = 12am (midnight) Sunday/Monday in New York. A Seoul lunch meeting is the middle of the night in New York. 6pm Monday in Seoul = 5am Monday in New York. End of the Seoul working day is before sunrise in New York. During EST (UTC-5), add one additional hour to all New York times: 9am Seoul becomes 7pm New York (Sunday), and 6pm Seoul becomes 4am New York.
Working Hours Overlap Explained
Seoul operates on Asia/Seoul (currently UTC+9). New York operates on America/New_York (currently UTC-4). The table below maps a standard 9:00 AM–6:00 PM day in Seoul to New York's local time.
| Seoul time | New York time | Status |
|---|---|---|
| 9:00 AM | 8:00 PM | New York outside hours |
| 10:00 AM | 9:00 PM | New York outside hours |
| 11:00 AM | 10:00 PM | New York outside hours |
| 12:00 PM | 11:00 PM | New York outside hours |
| 1:00 PM | 12:00 AM | New York outside hours |
| 2:00 PM | 1:00 AM | New York outside hours |
| 3:00 PM | 2:00 AM | New York outside hours |
| 4:00 PM | 3:00 AM | New York outside hours |
| 5:00 PM | 4:00 AM | New York outside hours |
| 6:00 PM | 5:00 AM | New York outside hours |
Tips for Scheduling Across Seoul and New York
- Seoul's Seollal and Chuseok each close offices for three to four days; check lunar calendar dates before booking January, February, or September meetings.
- New York reverts to EST in early November, adding one hour to the Seoul-New York gap overnight. Update recurring invites before that weekend.
- A 7am ET start during EDT lands at 8pm Seoul time, the most sustainable regular slot for both sides without requiring anyone to work past midnight.
- Seoul teams tracking NYSE-listed Korean stocks often work past 10pm local time; mid-evening Seoul calls are less disruptive than they appear on paper.
- Avoid booking New York counterparts the fourth Thursday of November or any date between 24 December and 2 January; out-of-office rates are high across that stretch.
Because Seoul never changes its clocks and New York changes twice a year, a recurring meeting set during EDT will silently become one hour harder for Seoul when November arrives and New York reverts to EST. A Seoul-side participant who accepted an 8pm standing slot in summer will find it becomes 9pm after the US clock change, without any calendar prompt flagging the shift. The practical fix: when setting up a recurring series, agree explicitly which city's local time is fixed, and send a calendar update in late October so the Seoul side is not surprised by the shift on the first Monday of November.
Public Holidays and Working Weeks
Seoul's working week runs Monday to Friday, with 9am-6pm as the formal pattern under South Korea's 52-hour weekly cap introduced in 2018. In practice, many firms, particularly in finance and technology, extend hours further. Friday evenings often feature hoesik, team social dinners that build relationships outside the office. This makes late Friday afternoon a poor time to schedule cross-city calls from the Seoul side, as attendance may be inconsistent. New York's rhythm tracks the NYSE open at 9:30am ET. Finance teams are typically at their desks before that, and the afternoon window from 4pm to 6pm ET is often used for calls with European partners. That same 4-6pm New York window corresponds to 5am-7am Seoul time the following day during EDT, and 6am-8am during EST. Neither is comfortable. On the holiday calendar, Seoul observes Seollal, the Lunar New Year, and Chuseok, both of which carry three to four days of national closure. Dates shift annually. Anyone with standing Seoul meetings in late January, February, or late September should verify dates well in advance. New York's major absences are Independence Day on 4 July, Thanksgiving on the fourth Thursday of November, and the stretch from 24 December through 2 January. Booking meetings in late November or the final two weeks of December from the Seoul side is likely to produce low New York attendance.
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