JST to MST
Convert Japan Standard Time to Mountain Time: the current time on both sides, how far apart they are right now, and an hour-by-hour conversion table.
When it is GMT+9, it is MDT.
MST is 15 hours behind JST.
Conversion table
| JST | MST |
|---|---|
| 12:00 AM | 09:00 AMprevious day |
| 01:00 AM | 10:00 AMprevious day |
| 02:00 AM | 11:00 AMprevious day |
| 03:00 AM | 12:00 PMprevious day |
| 04:00 AM | 01:00 PMprevious day |
| 05:00 AM | 02:00 PMprevious day |
| 06:00 AM | 03:00 PMprevious day |
| 07:00 AM | 04:00 PMprevious day |
| 08:00 AM | 05:00 PMprevious day |
| 09:00 AM | 06:00 PMprevious day |
| 10:00 AM | 07:00 PMprevious day |
| 11:00 AM | 08:00 PMprevious day |
| 12:00 PM | 09:00 PMprevious day |
| 01:00 PM | 10:00 PMprevious day |
| 02:00 PM | 11:00 PMprevious day |
| 03:00 PM | 12:00 AM |
| 04:00 PM | 01:00 AM |
| 05:00 PM | 02:00 AM |
| 06:00 PM | 03:00 AM |
| 07:00 PM | 04:00 AM |
| 08:00 PM | 05:00 AM |
| 09:00 PM | 06:00 AM |
| 10:00 PM | 07:00 AM |
| 11:00 PM | 08:00 AM |
About daylight saving
These abbreviations name a zone, not a fixed offset. JST is Asia/Tokyo and is currently on GMT+9; MST is America/Denver and is currently on MDT. The gap between them changes on the days each side switches, which is why this page converts through the zones rather than through a stored offset.
Other conversions
Frequently asked questions
Noon in JST is 09:00 PM MST. The live times are at the top of this page and in the table above.
MST is 15 hours behind JST.
Yes, whenever one side starts or ends daylight saving and the other has not yet. The times on this page are computed from the live time-zone rules, so they follow those changes.
MST follows the America/Denver zone, currently MDT.
Planning across these zones?
Create a countdown in either zone, or open the meeting planner to compare several at once.