Boulder to Tokyo Time Difference
Tokyo is 15 hours ahead of Boulder. When it is noon in Boulder, it is 03:00 in Tokyo.
Denver (UTC-6) → Tokyo (UTC+9)
🕐 Interactive Time Explorer
When it's 17:00 in Boulder, it's 08:00 in Tokyo
Drag the slider to see corresponding times in both cities
🤝 Best Meeting Times
Boulder & Tokyo◐ Extended Hours (5 hours)
✈️ Travel Information
Distance
9,294 km
Est. Flight Time
~11.9h
Time Difference
+15h
Work Hours Overlap
0h
None
🔴 Office Closed
No overlap available
No overlap
⏰ Quick Conversion
06:00
Boulder
21:00
Tokyo
09:00
Boulder
00:00
Tokyo (+1)
12:00
Boulder
03:00
Tokyo (+1)
15:00
Boulder
06:00
Tokyo (+1)
18:00
Boulder
09:00
Tokyo (+1)
21:00
Boulder
12:00
Tokyo (+1)
00:00
Boulder
15:00
Tokyo
03:00
Boulder
18:00
Tokyo
Frequently Asked Questions
How many hours is Boulder behind Tokyo?
Tokyo is 15 hours ahead of Boulder. When it is 12:00 noon in Boulder, it is 03:00 in Tokyo. Boulder operates on America/Denver (UTC-6), while Tokyo uses Asia/Tokyo (UTC+9).
What is the best time to call Tokyo from Boulder?
Standard business hours (9 AM–5 PM) do not overlap between Boulder and Tokyo due to the 15 hours difference. Consider early morning or late evening calls, or use async communication.
Does the Boulder to Tokyo time difference change throughout the year?
The time difference can shift by up to one hour when either city observes Daylight Saving Time (DST). DST transition dates differ between countries — typically March/April in the Northern Hemisphere and October in the Southern Hemisphere. Always verify the live difference above when scheduling important meetings near DST changeover dates.
Flying between Boulder and Tokyo
The distance between Boulder and Tokyo is approximately 9,294 km. A direct flight typically takes around 11.9 hours. Your arrival clock will show local Tokyo time — use our Flight Time Calculator to predict exact arrival times.