Seattle and Seoul share no standard 9–5 working hours; the least disruptive option is 3:00 PM PDT (7:00 AM GMT+9).
Plan a meeting →| Detail | Value |
|---|---|
| Time difference | 16h (Seoul is ahead) |
| Seattle 9–5 in Seoul time | 1:00 AM–9:00 AM GMT+9 |
| Seoul 9–5 in Seattle time | 5:00 PM–1:00 AM PDT |
| Overlap window | None during standard 9–5 hours |
| Least disruptive slot | 3:00 PM PDT = 7:00 AM GMT+9 |
| DST transitions (this year) | Seattle: March 8 / November 1 |
A 16h time gap separates Seattle (UTC-7) and Seoul (UTC+9). When you pick up your morning coffee in Seattle, your counterpart in Seoul is already deep into their afternoon. Getting a meeting right means understanding exactly where those working days intersect.
No working-hours overlap means async-first is not optional — it's the architecture. Set up structured daily handoffs: a written summary at end-of-day in each timezone, a shared task board both sides update, and a weekly call at a mutually acceptable off-hours time. The rotation matters: don't let one region always take the 7 AM or the 10 PM slot.
For any recurring sync between Seattle and Seoul, set the calendar invite in one canonical timezone and confirm the other side sees the correct local time. DST transitions can silently shift the effective meeting time by an hour for several weeks without either party noticing until someone is waiting alone on the call.
For truly zero-overlap pairs, the most important investment is async infrastructure: a written daily digest each team can read at the start of their day, a shared decision log so nothing critical gets blocked waiting for a live reply, and a clear escalation path for genuine emergencies. With those in place, most distributed teams find they need far fewer live calls than they assumed.
Seattle is UTC-7 and Seoul is UTC+9, a difference of 16h. This gap may shift by 1 hour during DST transitions.
There is no overlap during standard 9–17 hours. Consider a rotating schedule or an early/late meeting. TimeSync's standup planner can find the least-painful slot.
Yes, partially. Seattle observes daylight saving time; Seoul does not. Seattle's clocks change around March 8 and November 1, shifting the gap between the two cities by 1 hour for part of the year.
Seattle and Seoul have no overlap during standard 9 AM–5 PM business hours.
Under standard 9–5 schedules, no. The 16h gap means the two cities' business days do not overlap. Teams that need synchronous collaboration typically shift one side's hours, rotate the inconvenient slot fairly, or rely on async-first workflows with structured handoffs.