Denver is typically 16 hours behind Tokyo. When it's 11:00 PM in Tokyo, it's 7:00 AM in Denver. Japan does not observe daylight saving time, but Denver 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: 5:00 AM - 7:00 AM Denver time (8:00 PM - 10:00 PM Tokyo, or 9:00 PM - 11:00 PM in winter). Very early morning Denver catches evening Tokyo.
Denver's tech and outdoor equipment companies coordinate with Japanese manufacturers during these challenging hours.