MST to JST Converter and Time Difference
JST is 16 hours ahead of MST.
Best meeting time
No time works for everyone. Best compromise: 12:00 AM to 1:00 AM (Denver time), when 1 city is outside working hours.
Working hours are 9 AM to 5 PM in each city. Times are for Thursday, 5 November 2026.
MST 6 AM to 10 PM in JST
Each row is a time in Mountain Time (MST/MDT) and the matching time in Japan Standard Time.
| MST | JST | Day | Fit |
|---|---|---|---|
| 6:00 AM | 10:00 PM | Same day | Outside working hours |
| 7:00 AM | 11:00 PM | Same day | Outside working hours |
| 8:00 AM | 12:00 AM | +1 | Outside working hours |
| 9:00 AM | 1:00 AM | +1 | Outside working hours |
| 10:00 AM | 2:00 AM | +1 | Outside working hours |
| 11:00 AM | 3:00 AM | +1 | Outside working hours |
| 12:00 PM | 4:00 AM | +1 | Outside working hours |
| 1:00 PM | 5:00 AM | +1 | Outside working hours |
| 2:00 PM | 6:00 AM | +1 | Outside working hours |
| 3:00 PM | 7:00 AM | +1 | Early or late for one city |
| 4:00 PM | 8:00 AM | +1 | Early or late for one city |
| 5:00 PM | 9:00 AM | +1 | Early or late for one city |
| 6:00 PM | 10:00 AM | +1 | Early or late for one city |
| 7:00 PM | 11:00 AM | +1 | Early or late for one city |
| 8:00 PM | 12:00 PM | +1 | Early or late for one city |
| 9:00 PM | 1:00 PM | +1 | Outside working hours |
| 10:00 PM | 2:00 PM | +1 | Outside working hours |
Each row is a time in Mountain Time (MST/MDT) and the matching time in Japan Standard Time.
JST 6 AM to 10 PM in MST
The same comparison in the other direction: each row is a time in Japan Standard Time and the matching time in Mountain Time (MST/MDT).
| JST | MST | Day | Fit |
|---|---|---|---|
| 6:00 AM | 2:00 PM | -1 | Outside working hours |
| 7:00 AM | 3:00 PM | -1 | Early or late for one city |
| 8:00 AM | 4:00 PM | -1 | Early or late for one city |
| 9:00 AM | 5:00 PM | -1 | Early or late for one city |
| 10:00 AM | 6:00 PM | -1 | Early or late for one city |
| 11:00 AM | 7:00 PM | -1 | Early or late for one city |
| 12:00 PM | 8:00 PM | -1 | Early or late for one city |
| 1:00 PM | 9:00 PM | -1 | Outside working hours |
| 2:00 PM | 10:00 PM | -1 | Outside working hours |
| 3:00 PM | 11:00 PM | -1 | Outside working hours |
| 4:00 PM | 12:00 AM | Same day | Outside working hours |
| 5:00 PM | 1:00 AM | Same day | Outside working hours |
| 6:00 PM | 2:00 AM | Same day | Outside working hours |
| 7:00 PM | 3:00 AM | Same day | Outside working hours |
| 8:00 PM | 4:00 AM | Same day | Outside working hours |
| 9:00 PM | 5:00 AM | Same day | Outside working hours |
| 10:00 PM | 6:00 AM | Same day | Outside working hours |
Each row is a time in Japan Standard Time and the matching time in Mountain Time (MST/MDT).
Daylight saving and this time difference
Only MST uses daylight saving time, so the gap changes twice a year when its clocks move.
UTC offsets right now: MST is UTCUTC-7, and JST is UTCUTC+9 on Thursday, 5 November 2026. Check the date of your meeting in the planner, since the gap can change for a few weeks each year.
To compare more than two cities, open the meeting planner. To see the gap between any two cities, try the time difference calculator.
Related conversions
Frequently asked questions
What is the time difference between MST and JST?
JST is 16 hours ahead of MST. The comparison uses Thursday, 5 November 2026, so the result is correct for that date.
When is the best time for a meeting between MST and JST?
No time works for everyone. Best compromise: 12:00 AM to 1:00 AM (Denver time), when 1 city is outside working hours.
Does the time difference between MST and JST change with daylight saving?
Only MST uses daylight saving time, so the gap changes twice a year when its clocks move.