Results
12:02 PM MST in JST
Japan Standard Time · next day · right now JST is 15 hours ahead of MST
Times follow Denver for MST and Tokyo for JST, using the IANA time zone database.
MST to JST time difference
JST is 15 hours ahead of MST for most of 2026, and 16 hours ahead of MST for about 127 days, because daylight saving time changes on different dates.
In 2026, Mountain Time switches to MDT on March 8 and back to MST on November 1. Japan Standard Time does not use daylight saving time.
MST to JST conversion table
Every hour on 2026-09-28. Highlighted rows fall inside 9 AM–5 PM in both zones.
| MST (Mountain Time) | JST (Japan Standard Time) |
|---|---|
| 12:00 AM | 3:00 PM |
| 1:00 AM | 4:00 PM |
| 2:00 AM | 5:00 PM |
| 3:00 AM | 6:00 PM |
| 4:00 AM | 7:00 PM |
| 5:00 AM | 8:00 PM |
| 6:00 AM | 9:00 PM |
| 7:00 AM | 10:00 PM |
| 8:00 AM | 11:00 PM |
| 9:00 AM | 12:00 AM · next day |
| 10:00 AM | 1:00 AM · next day |
| 11:00 AM | 2:00 AM · next day |
| 12:00 PM | 3:00 AM · next day |
| 1:00 PM | 4:00 AM · next day |
| 2:00 PM | 5:00 AM · next day |
| 3:00 PM | 6:00 AM · next day |
| 4:00 PM | 7:00 AM · next day |
| 5:00 PM | 8:00 AM · next day |
| 6:00 PM | 9:00 AM · next day |
| 7:00 PM | 10:00 AM · next day |
| 8:00 PM | 11:00 AM · next day |
| 9:00 PM | 12:00 PM · next day |
| 10:00 PM | 1:00 PM · next day |
| 11:00 PM | 2:00 PM · next day |
Working hours overlap
On 2026-09-28, 9 AM–5 PM workdays in MST and JST don't overlap. Try an early start in one zone and a late finish in the other, or use the meeting planner.
Convert MST to other time zones
How to use
Follow these steps to get a result
Pick a date and a time in Mountain Time (MST).
Read the matching JST time, including whether it falls on the next or previous day.
Scan the 24-hour table to see every hour at once, with shared working hours highlighted.
Features
What this tool includes
Live clocks for both time zones
Daylight saving time handled automatically
24-hour conversion table
Working-hours overlap
FAQ
Common questions about this tool
Related tools
Continue with something nearby