Tokyo to Boulder time converter

Boulder is 15 hours behind Tokyo. When it is 9:00 AM in Tokyo, it is 6:00 PM (Fri, Oct 16) in Boulder.

Tokyo JST

Saturday, October 17, 2026

Boulder MDT

Friday, October 16, 2026

Tokyo
Japan
Sat, Oct 17
JSTUTC+9
Boulder
Colorado, United States
Fri, Oct 16
MDTUTC-6-15h
Finding your time zone…
Shared working hours (9:00–18:00)

Tokyo to Boulder conversion table

Every hour of today in Tokyo and the matching time in Boulder. Light rows are typical working hours (9:00–18:00).

TokyoBoulder
12:00 AM9:00 AM−1 day
1:00 AM10:00 AM−1 day
2:00 AM11:00 AM−1 day
3:00 AM12:00 PM−1 day
4:00 AM1:00 PM−1 day
5:00 AM2:00 PM−1 day
6:00 AM3:00 PM−1 day
7:00 AM4:00 PM−1 day
8:00 AM5:00 PM−1 day
9:00 AM6:00 PM−1 day
10:00 AM7:00 PM−1 day
11:00 AM8:00 PM−1 day
12:00 PM9:00 PM−1 day
1:00 PM10:00 PM−1 day
2:00 PM11:00 PM−1 day
3:00 PM12:00 AM
4:00 PM1:00 AM
5:00 PM2:00 AM
6:00 PM3:00 AM
7:00 PM4:00 AM
8:00 PM5:00 AM
9:00 PM6:00 AM
10:00 PM7:00 AM
11:00 PM8:00 AM

Best time to call or meet

Working hours don't overlap fully. The closest fit is 7:00 AM – 9:00 AM in Tokyo (4:00 PM – 6:00 PM in Boulder): working hours on one side, early or late on the other.

Daylight saving time and the difference

The difference changes during the year because Tokyo and Boulder switch clocks on different dates:

  • Oct 17, 2026 – Nov 1, 2026: -15h
  • Nov 1, 2026 – Mar 14, 2027: -16h
  • Mar 14, 2027 – Oct 17, 2027: -15h

Distance

Tokyo and Boulder are 9,293 km (5,774 miles) apart in a straight line.

More conversions

Boulder to TokyoTokyo to New YorkTokyo to LondonTokyo to Los AngelesTokyo to ChicagoTokyo to TorontoTokyo to São PauloTokyo to ParisTokyo to BerlinTokyo to MoscowTokyo to DubaiTokyo to New DelhiTokyo to Bangkok
New York to BoulderLondon to BoulderLos Angeles to BoulderChicago to BoulderToronto to BoulderSão Paulo to BoulderParis to BoulderBerlin to BoulderMoscow to BoulderDubai to BoulderNew Delhi to BoulderBangkok to Boulder

Questions and answers

What is the time difference between Tokyo and Boulder?

Boulder is 15 hours behind Tokyo.

What time is it in Boulder when it is 9 AM in Tokyo?

When it is 9:00 AM in Tokyo, it is 6:00 PM (Fri, Oct 16) in Boulder.

When is the best time to call Boulder from Tokyo?

Working hours don't overlap fully. The closest fit is 7:00 AM – 9:00 AM in Tokyo (4:00 PM – 6:00 PM in Boulder): working hours on one side, early or late on the other.

Does the time difference between Tokyo and Boulder change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.