MST to JST Time Converter
Convert Mountain Time to Japan Standard Time instantly.
Scroll the timeline to check any hour of the day.
Mountain Time
MST
2:25
Japan Standard Time
JST
5:25
MST is on daylight savings (MDT), while JST is on standard time (JST) right now.
Search any city, build a custom world clock, and plan across more time zones and options in the FlutterTime app. Free.
How the MST to JST time difference works
JST is 15 hours ahead of MST. Mountain Time (MST) is the US Mountain time zone. Japan Standard Time (JST) is the time zone of Japan. For example, 9:00 AM MST is 12:00 AM JST. Scroll the timeline above to convert any moment, or use the chart below for a quick reference.
Time difference
15 hours
Daylight saving
MST only
MST offset
UTC-7
JST offset
UTC+9
MST to JST conversion chart
| Mountain Time (MST) | Japan Standard Time (JST) |
|---|---|
| 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 +1 day |
| 10:00 AM | 1:00 AM +1 day |
| 11:00 AM | 2:00 AM +1 day |
| 12:00 PM | 3:00 AM +1 day |
| 1:00 PM | 4:00 AM +1 day |
| 2:00 PM | 5:00 AM +1 day |
| 3:00 PM | 6:00 AM +1 day |
| 4:00 PM | 7:00 AM +1 day |
| 5:00 PM | 8:00 AM +1 day |
| 6:00 PM | 9:00 AM +1 day |
| 7:00 PM | 10:00 AM +1 day |
| 8:00 PM | 11:00 AM +1 day |
| 9:00 PM | 12:00 PM +1 day |
| 10:00 PM | 1:00 PM +1 day |
| 11:00 PM | 2:00 PM +1 day |
Cities in each time zone
Mountain Time (MST)
DenverSalt Lake CityAlbuquerqueBoiseColorado Springs
Japan Standard Time (JST)
TokyoOsakaYokohamaNagoyaSapporo
MST to JST questions
Is JST ahead of or behind MST?
JST is 15 hours ahead of MST. So 9:00 AM MST is 12:00 AM JST, and 5:00 PM MST is 8:00 AM JST.
What time is it in JST when it is 12:00 PM MST?
When it is 12:00 PM (noon) MST in Mountain Time, it is 3:00 AM JST in Japan Standard Time.
How many hours difference is there between MST and JST?
There is a 15 hours difference. Japan Standard Time (JST) runs 15 hours ahead of Mountain Time (MST).
Do MST and JST observe daylight saving time?
Mountain Time observes daylight saving time but Japan Standard Time does not, so the difference between them changes by an hour twice a year.
What is the best time to schedule a meeting between MST and JST?
A standard 9-to-5 workday in Mountain Time and Japan Standard Time does not overlap, so pick the early morning in the later zone or the late evening in the earlier zone.
Which cities use MST and JST?
Mountain Time (MST) covers cities such as Denver, Salt Lake City, Albuquerque, Boise, Colorado Springs. Japan Standard Time (JST) covers cities such as Tokyo, Osaka, Yokohama, Nagoya, Sapporo.