What is the time difference between MST and JST?

MST is 16 hours ahead JST. MST is UTC-7 and JST is UTC+9.

What is 9 AM MST in JST?

9 AM MST is 12 AM JST (next day).

What is 12 PM MST in JST?

12 PM MST (noon) is 3 AM JST (next day).

What are the best meeting times between MST and JST?

There is no standard business hours overlap between MST and JST.

MST to JST Time Converter

Mountain Standard Time → Japan Standard Time

MST

UTC-7

Mountain Standard Time

offset

+16h

JST is 16h ahead

JST

UTC+9

Japan Standard Time

MST observes DST — offset shifts ±1h during transitions

Mountain Standard Time (MST) is 16 hours ahead Japan Standard Time (JST). When it is noon in MST, it is 3 AM in JST. This offset may change during Daylight Saving Time transitions.

Meeting planner tool Reverse: JST to MST

Cities in MST

🇺🇸Phoenix 🇺🇸Denver 🇨🇦Calgary

Cities in JST

🇯🇵Tokyo 🇯🇵Osaka

All 24 Hours — MST to JST

Click any row to see the full detail page. Current hour in MST is highlighted.

Both business hoursPartial overlap

12 AM6 AM12 PM6 PM11 PM

Best Meeting Times — MST & JST

No standard business-hours overlap between MST and JST. Consider early morning or evening calls.

Challenging overlap

MST and JST are 16 hours apart with no shared business-hours window. Try scheduling at 8 AM in the earlier timezone or 6 PM in the later one.

8 AM→11 PM 9 AM→12 AM+1d 10 AM→1 AM+1d 11 AM→2 AM+1d 12 PM→3 AM+1d 1 PM→4 AM+1d 2 PM→5 AM+1d 3 PM→6 AM+1d 4 PM→7 AM+1d 5 PM→8 AM+1d

Related Time Zone Conversions

Frequently Asked Questions — MST to JST

Mountain Standard Time (MST) is 16 hours ahead of Japan Standard Time (JST). MST is UTC-7 and JST is UTC+9. This offset may shift by ±1 hour during Daylight Saving Time transitions.