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MT to JST time converter
Japan is 15 hours ahead of US Mountain for 238 days of 2026, and 16 hours ahead of for the other 127 days, because daylight saving changes the gap.
MT to JST conversion table
Local time in US Mountain and the matching time in Japan on two reference dates, one in winter and one in summer for the northern hemisphere.
| US Mountain (MT) | Japan on 15 January | Japan on 15 July |
|---|---|---|
| 08:00 | 00:00 (+1 day) | 23:00 |
| 09:00 | 01:00 (+1 day) | 00:00 (+1 day) |
| 10:00 | 02:00 (+1 day) | 01:00 (+1 day) |
| 12:00 | 04:00 (+1 day) | 03:00 (+1 day) |
| 15:00 | 07:00 (+1 day) | 06:00 (+1 day) |
| 17:00 | 09:00 (+1 day) | 08:00 (+1 day) |
| 18:00 | 10:00 (+1 day) | 09:00 (+1 day) |
| 21:00 | 13:00 (+1 day) | 12:00 (+1 day) |
Best meeting times between US Mountain and Japan
- January: No overlap inside both working days. The closest flexible hours (07:00-21:00): 15:00-21:00 MT = 07:00-13:00 JST (+1 day).
- July: No overlap inside both working days. The closest flexible hours (07:00-21:00): 16:00-21:00 MT = 07:00-12:00 JST (+1 day).
Want to add more people? The meeting planner starts with these two zones and lets you add up to four more.
Daylight saving between MT and JST
- US Mountain moves its clocks forward on 8 March and back on 1 November in 2026.
- Japan does not change its clocks in 2026.
- The gap is 15 hours for 238 days and 16 hours for 127 days of 2026.
About the two zones
US Mountain. US Mountain Time is UTC-7 in winter (MST) and UTC-6 in summer (MDT). Arizona is the notable exception and stays on MST all year.
Japan. Japan Standard Time is UTC+9 all year with no daylight saving.
Frequently asked questions
What time is 9 AM MT in JST?
On 15 January, 09:00 in US Mountain is 01:00 (+1 day) in Japan. On 15 July it is 00:00 (+1 day).
What is the time difference between US Mountain and Japan?
Japan is 15 hours ahead of US Mountain for 238 days of 2026, and 16 hours ahead of for the other 127 days, because daylight saving changes the gap.
Does the time difference between MT and JST change during the year?
Yes. US Mountain changes its clocks and Japan does not, so the gap moves between 15 and 16 hours. Always convert with the actual date.
When is the best time for a meeting between US Mountain and Japan?
No overlap inside both working days. The closest flexible hours (07:00-21:00): 15:00-21:00 MT = 07:00-13:00 JST (+1 day). In July: No overlap inside both working days. The closest flexible hours (07:00-21:00): 16:00-21:00 MT = 07:00-12:00 JST (+1 day).
More conversions
Need the time in a scheduler? Convert a local-time cron schedule to UTC, or see which jobs a clock change affects with the DST collision simulator.