Time Difference Between Mountain Time and Japan
As of 31 August 2026, Japan is 15 hours ahead of Mountain Time. That number is not constant. Over the course of a year, because of daylight saving changes, Tokyo, Japan ranges from 15 hours ahead to 16 hours ahead relative to Mountain Time, United States. The calculator below is always up to date.
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Mountain Time, United States
16:34
Mon, Aug 31, 2026
UTC-6 · MDT · America/Denver
Tokyo, Japan
+15h07:34
Tue, Sep 1, 2026
UTC+9 · Asia/Tokyo
Japan is 15 hours ahead of Mountain Time.
When it is 16:34 in Mountain Time, it is already the next day in Japan.
Time zone details
| Place | Local date | Time zone | UTC offset | Summer time |
|---|---|---|---|---|
| Mountain Time | Monday, August 31, 2026 | MDTAmerica/Denver | UTC-6 | Active now |
| Japan | Tuesday, September 1, 2026 | Asia/Tokyo | UTC+9 | Not observed |
Mountain Time: Covers Denver and most of the Rocky Mountain states. Switches between MST (UTC-7) and MDT (UTC-6) with daylight saving — unlike Arizona, which stays on MST year-round.
Hour by hour: Mountain Time to Japan
Every hour of today in Mountain Time and what it is in Japan. Highlighted rows fall inside Japan working hours (09:00–18:00).
| Mountain Time | Japan |
|---|---|
| 00:00 | 15:00 |
| 01:00 | 16:00 |
| 02:00 | 17:00 |
| 03:00 | 18:00 |
| 04:00 | 19:00 |
| 05:00 | 20:00 |
| 06:00 | 21:00 |
| 07:00 | 22:00 |
| 08:00 | 23:00 |
| 09:00 | 00:00next day |
| 10:00 | 01:00next day |
| 11:00 | 02:00next day |
| Mountain Time | Japan |
|---|---|
| 12:00 | 03:00next day |
| 13:00 | 04:00next day |
| 14:00 | 05:00next day |
| 15:00 | 06:00next day |
| 16:00 | 07:00next day |
| 17:00 | 08:00next day |
| 18:00 | 09:00next day |
| 19:00 | 10:00next day |
| 20:00 | 11:00next day |
| 21:00 | 12:00next day |
| 22:00 | 13:00next day |
| 23:00 | 14:00next day |
Best time to call or meet
Overlapping working hours
No overlap
Standard working hours in Mountain Time and Japan never overlap. Someone has to start early or finish late — the calling window below is the practical compromise.
Reasonable calling hours
17:00–21:00 in Mountain Time (08:00–12:00 in Japan)
Both people are awake and available between 08:00 and 21:00 local time during this window.
When this difference changes
Mountain Time puts its clocks back on Sunday, November 1, 2026
The local offset moves from UTC-6 to UTC-7. After that date, Japan is 16 hours ahead of Mountain Time — instead of 15 hours ahead, as it is today.
Planning something with more than two places?
Adding a third city usually kills the obvious answer. The Meeting Time Finder takes up to five cities at once and shows only the hours that work for everybody.
Mountain Time and Japan: common questions
What is the time difference between Mountain Time and Japan?
As of 31 August 2026, Japan is 15 hours ahead of Mountain Time. The gap is not fixed: across the year, Japan ranges from 15 hours ahead to 16 hours ahead relative to Mountain Time, as clocks change. The calculator on this page always shows the difference for right now.
When it is 9:00 AM in Mountain Time, what time is it in Japan?
It is 12:00 AM in Tokyo, Japan. Use the time field in the calculator above to check any other hour.
Is Japan ahead of or behind Mountain Time?
Japan is ahead of Mountain Time by 15 hours at the moment. In practical terms, the working day in Japan starts and ends earlier in Mountain Time terms.
Do Mountain Time and Japan observe daylight saving time?
Mountain Time changes its clocks twice a year; Japan does not. The difference therefore shifts by an hour when Mountain Time switches: across the year, Japan ranges from 15 hours ahead to 16 hours ahead relative to Mountain Time.
What is the best time to call Japan from Mountain Time?
Standard working hours in Mountain Time and Japan do not overlap at all, so one side has to take the call outside office hours. Early morning in Mountain Time or late evening is usually the least disruptive option.
Related comparisons
Local dates shown for Mountain Time, United States (UTC-6) and Tokyo, Japan (UTC+9) were generated on Monday, August 31, 2026 UTC and refresh in your browser.