Seattle is typically 16 hours behind Hong Kong. When it's midnight in Hong Kong, it's 8:00 AM the previous day in Seattle. Hong Kong does not observe daylight saving time, but Seattle does.
During US daylight saving time (March to November), the difference is 15 hours. During US standard time (November to March), the difference increases to 16 hours.
Optimal meeting window: 4:00 AM - 6:00 AM Seattle time (7:00 PM - 9:00 PM Hong Kong, or 8:00 PM - 10:00 PM in winter). Very early morning Seattle catches evening Hong Kong.
Seattle's tech giants like Microsoft and Amazon have significant operations in Hong Kong, and the city serves as a gateway for Pacific Northwest trade with Asia.