Seoul is 13 hours ahead of United States. When Seoul clocks hit noon, United States reads 23:00.
Seoul observes Asia/Seoul and United States observes America/New_York — a 13 hours gap between them.
Shared working hours
When Seoul is in standard working hours, United States is not — and vice versa. There is no mutual business window between these two locations.
Optimal meeting slots
No business hours overlap exists between Seoul and United States. Showing the most balanced options with minimal inconvenience for both locations.
05:00 Seoul / 16:00 New York⚡ One side off-hours
⚠️ 4h before working hours in Seoul
09:00 Seoul / 20:00 New York⚡ One side off-hours
⚠️ 4h after working hours in New York
04:00 Seoul / 15:00 New York⚡ One side off-hours
⚠️ 5h before working hours in Seoul
Assumes a standard 9 AM–5 PM workday in each location's local timezone.
Holiday calendar for both locations
⚡ Both locations have upcoming holidays, check availability before scheduling.
Seoul6 holidays
Sep 24Chuseok
Sep 25Chuseok
Sep 26Chuseok
Oct 3National Foundation Day
Oct 9Hangul Day
United States6 holidays
Sep 7Labour Day
Oct 12Columbus Day
Oct 12Indigenous Peoples' Day
Nov 11Veterans Day
Nov 26Thanksgiving Day
Working across Seoul and United States
A 13-hour difference separates Seoul (South Korea) and United States (USA) — wide enough that standard business hours don't align at all. Scheduling requires deliberate compromise from both sides.
💡 Best practice for cross-timezone meetings
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05:00–06:00 in Seoul corresponds to 16:00–17:00 in United States (4h before working hours in Seoul).
⚡
09:00–10:00 in Seoul corresponds to 20:00–21:00 in United States (4h after working hours in New York).
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04:00–05:00 in Seoul corresponds to 15:00–16:00 in United States (5h before working hours in Seoul).
Since there is no natural overlap, the options above represent the most balanced compromise, minimizing out-of-hours inconvenience for both sides.
Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.
Drag the slider at the top to convert any Seoul time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.
