Seoul to San Francisco Time Conversion
Master the 16-hour transpacific leap between Asia's tech capital and Silicon Valley with intelligent time coordination
Start in Seoul Time
Enter "Seoul" or Asia/Seoul as your origin. The tool pre-fills with Korea Standard Time (KST) for immediate use.
Add San Francisco
Type "San Francisco" or America/Los_Angeles to see the dramatic 16-hour time difference and plan across the date line.
Select Time Perspective
Use Live mode for real-time tracking or Custom mode to schedule meetings across the "yesterday-today" time gap.
Coordinate Your Team
Generate shareable links for global teams or copy specific times for calendar invites across this challenging time zone pair.
Essential Features for Seoul-SF Planning
- Date Line Intelligence Automatically handles the unique situation where Seoul is already in tomorrow while San Francisco remains in today.
- Bidirectional Planning Quickly swap to see San Francisco to Seoul timing for callback scheduling and reverse-perspective planning.
- Transpacific Flight Recovery Plan sleep schedules for the long-haul flight between Incheon and SFO, minimizing 16-hour time zone jet lag.
- Seasonal Adjustment Tracking Monitor when the time difference shifts between 16-17 hours due to different DST observance schedules.
Smart Coordination Strategies
Tech Industry Overlap Strategy
Maximize the brief 2-hour window (Seoul 09:00-11:00 = San Francisco 16:00-18:00 previous day) for real-time collaboration between tech teams.
Historical Time Context
Korea standardized to GMT+9 in 1912 during Japanese occupation, creating this consistent time relationship with Pacific Time that has endured for over a century.
Asynchronous Work Advantage
Use Seoul's workday to prepare deliverables that San Francisco team can review and continue working on the same calendar day.
Seoul-San Francisco Time Questions
Why does Seoul feel like "tomorrow" compared to San Francisco?
Seoul is 16-17 hours ahead, meaning when it's morning in Seoul, it's still afternoon/evening of the previous day in San Francisco.
What's the best day for weekly team syncs between these cities?
Friday mornings in Seoul (connecting with Thursday afternoon in SF) allow both teams to wrap up the week and plan for Monday.
How do I schedule urgent issues across this time gap?
Use the tool to find when Seoul evening (18:00-21:00) overlaps with San Francisco early morning (02:00-05:00) for emergency contacts.
Asian Hubs to Global Destinations
Precision Time Calculation
- Converts between Asia/Seoul (KST - GMT+9) and America/Los_Angeles (PST/PDT - GMT-8/GMT-7) IANA time zones
- Handles the 16-hour standard difference and 17-hour difference during US daylight saving time
- Manages date line crossing automatically, showing correct day relationships
- Processes time calculations using precise UTC offsets accounting for seasonal changes
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