JST to MST time difference
MST is 15 hours behind JST right now. The difference changes between 16 hours and 15 hours during the year because of daylight saving time.
Quick examples: 9:00 AM JST = 6:00 PM MST · 12:00 PM JST = 9:00 PM MST · 5:00 PM JST = 2:00 AM MST
JST to MST conversion table
| Japan Standard Time (JST) | Mountain Time (MST) |
|---|---|
| 12:00 AM JST | 9:00 AM MST (previous day) |
| 1:00 AM JST | 10:00 AM MST (previous day) |
| 2:00 AM JST | 11:00 AM MST (previous day) |
| 3:00 AM JST | 12:00 PM MST (previous day) |
| 4:00 AM JST | 1:00 PM MST (previous day) |
| 5:00 AM JST | 2:00 PM MST (previous day) |
| 6:00 AM JST | 3:00 PM MST (previous day) |
| 7:00 AM JST | 4:00 PM MST (previous day) |
| 8:00 AM JST | 5:00 PM MST (previous day) |
| 9:00 AM JST | 6:00 PM MST (previous day) |
| 10:00 AM JST | 7:00 PM MST (previous day) |
| 11:00 AM JST | 8:00 PM MST (previous day) |
| 12:00 PM JST | 9:00 PM MST (previous day) |
| 1:00 PM JST | 10:00 PM MST (previous day) |
| 2:00 PM JST | 11:00 PM MST (previous day) |
| 3:00 PM JST | 12:00 AM MST |
| 4:00 PM JST | 1:00 AM MST |
| 5:00 PM JST | 2:00 AM MST |
| 6:00 PM JST | 3:00 AM MST |
| 7:00 PM JST | 4:00 AM MST |
| 8:00 PM JST | 5:00 AM MST |
| 9:00 PM JST | 6:00 AM MST |
| 10:00 PM JST | 7:00 AM MST |
| 11:00 PM JST | 8:00 AM MST |
How to convert JST to MST
- Pick a date and time in Japan Standard Time.
- The matching Mountain Time time appears instantly on the right.
- Use the ⇄ button to convert MST to JST instead.
About Japan Standard Time and Mountain Time
Japan Standard Time (JST) is used in Tokyo, Osaka and all of Japan. Mountain Time (MST) is used in Denver, Salt Lake City and Calgary.
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Frequently asked questions
What is the time difference between JST and MST?
MST is 15 hours behind JST right now. The difference changes between 16 hours and 15 hours during the year because of daylight saving time.
How do I convert JST to MST?
Subtract 15 hours to the JST time. For example, 12:00 PM JST is 9:00 PM MST.
Where is JST used?
Japan Standard Time is used in Tokyo, Osaka and all of Japan.
Where is MST used?
Mountain Time is used in Denver, Salt Lake City and Calgary.
Does this converter handle daylight saving time?
Yes. The converter uses the official time zone database, so it automatically applies daylight saving time for the date you pick.