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JST to MST Time Converter

MST is 16 hours behind JST right now. 9:00 AM in JST is 5:00 PM in MST (the day before).

Time now: JST and MST

🌐 Japan Standard Time (JST)8:59 AMTuesday, November 10 · UTC+09:00
🌐 Mountain Time (US & Canada)4:59 PMMonday, November 9 · UTC-07:00

MST is 16 hours behind JST right now. The gap is not fixed: it is 16 hours at some times of the year and 15 hours at others, because at least one of them changes its clocks for daylight saving time.

JST to MST conversion table

Every hour of the day, using today's time difference.

JSTMST
12:00 AM8:00 AMprevious day
1:00 AM9:00 AMprevious day
2:00 AM10:00 AMprevious day
3:00 AM11:00 AMprevious day
4:00 AM12:00 PMprevious day
5:00 AM1:00 PMprevious day
6:00 AM2:00 PMprevious day
7:00 AM3:00 PMprevious day
8:00 AM4:00 PMprevious day
9:00 AM5:00 PMprevious day
10:00 AM6:00 PMprevious day
11:00 AM7:00 PMprevious day
12:00 PM8:00 PMprevious day
1:00 PM9:00 PMprevious day
2:00 PM10:00 PMprevious day
3:00 PM11:00 PMprevious day
4:00 PM12:00 AM
5:00 PM1:00 AM
6:00 PM2:00 AM
7:00 PM3:00 AM
8:00 PM4:00 AM
9:00 PM5:00 AM
10:00 PM6:00 AM
11:00 PM7:00 AM

Best time to meet between JST and MST

Working hours overlap (9 AM – 6 PM in both places):

  • 9:00 AM – 10:00 AM JST = 5:00 PM – 6:00 PM MST

The time difference changes during the year because of daylight saving time, so these windows shift by an hour at other times.

Does the time difference between JST and MST change?

Yes. Right now MST is 16 hours behind JST. These are the dates in the next 12 months when the gap changes:

  • Sunday, 14 March 2027: MST moves its clocks forward. MST is 15 hours behind JST from then (it was 16 hours before).
  • Sunday, 7 November 2027: MST moves its clocks back. MST is 16 hours behind JST from then (it was 15 hours before).

Office hours in each other's time

  • 9 AM to 6 PM in JST is 5:00 PM (previous day) to 2:00 AM in MST.
  • 9 AM to 6 PM in MST is 1:00 AM (next day) to 10:00 AM (next day) in JST.

Based on today's clock settings.

Frequently asked questions

What is the time difference between JST and MST?

MST is 16 hours behind JST right now. The gap is not fixed: it is 16 hours at some times of the year and 15 hours at others, because at least one of them changes its clocks for daylight saving time.

How do I convert JST to MST?

Subtract 16 hours from the JST time to get the MST time (at today's difference). 9:00 AM in JST is 5:00 PM in MST (the day before). Or use the converter above and pick any date and time.

What is the current time in MST?

It is 4:59 PM in MST on Monday, November 9 (the converter above shows it live). At the same moment it is 8:59 AM in JST.

Does the time difference between JST and MST change during the year?

Yes. Right now MST is 16 hours behind JST. Over the next 12 months the gap changes 2 times: Sunday, 14 March 2027: MST moves its clocks forward. MST is 15 hours behind JST from then (it was 16 hours before). Sunday, 7 November 2027: MST moves its clocks back. MST is 16 hours behind JST from then (it was 15 hours before).

What is the best time for a meeting between JST and MST?

Between 9 AM and 6 PM in both places you can meet at 9:00 AM – 10:00 AM JST = 5:00 PM – 6:00 PM MST. Check the overlap section on this page for every option.

What does MST mean?

Mountain Time is MST (UTC-07:00) in winter and MDT (UTC-06:00) in summer. Arizona stays on MST all year.

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