TimeToZone

JST to MST Converter

MST is 16 hours behind JST. 9:00 AM JST = 5:00 PM MST (previous day).

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JSTfrom
Japan Standard Time
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MST
Mountain Standard Time
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MST is 16 hours behind JST at the moment. To convert JST to MST, subtract 16 hours from the JST time: 9:00 AM JST = 5:00 PM MST (previous day).

JST (Japan Time) is used in Japan. MST (Mountain Time) is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year.

Most of Arizona uses MST all year and does not switch to MDT.

JST to MST time conversion table

JST to MST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.

JSTMSTDay
12:00 AM JST8:00 AM MSTprevious day
1:00 AM JST9:00 AM MSTprevious day
2:00 AM JST10:00 AM MSTprevious day
3:00 AM JST11:00 AM MSTprevious day
4:00 AM JST12:00 PM MSTprevious day
5:00 AM JST1:00 PM MSTprevious day
6:00 AM JST2:00 PM MSTprevious day
7:00 AM JST3:00 PM MSTprevious day
8:00 AM JST4:00 PM MSTprevious day
9:00 AM JST5:00 PM MSTprevious day
10:00 AM JST6:00 PM MSTprevious day
11:00 AM JST7:00 PM MSTprevious day
12:00 PM JST8:00 PM MSTprevious day
1:00 PM JST9:00 PM MSTprevious day
2:00 PM JST10:00 PM MSTprevious day
3:00 PM JST11:00 PM MSTprevious day
4:00 PM JST12:00 AM MSTnight
5:00 PM JST1:00 AM MSTnight
6:00 PM JST2:00 AM MSTnight
7:00 PM JST3:00 AM MSTnight
8:00 PM JST4:00 AM MSTnight
9:00 PM JST5:00 AM MSTnight
10:00 PM JST6:00 AM MST—
11:00 PM JST7:00 AM MST—
  • Work rows — 9 AM–5 PM in both places
  • Night in the destination (10 PM–6 AM)

How to convert JST to MST

Subtract 16 hours from the JST time to get MST.

Example: 9:00 AM JST = 5:00 PM MST (previous day).

Across midnight: 1:00 AM JST = 9:00 AM MST (previous day). The date changes, so always check the day as well as the hour.

Time difference between JST and MST

The time difference between JST and MST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:

  • 1 Jan 2026 – 7 Mar 2026: MST is 16 hours behind of JST.
  • 8 Mar 2026 – 31 Oct 2026: MST is 15 hours behind of JST.
  • 1 Nov 2026 – 31 Dec 2026: MST is 16 hours behind of JST.

JST and MST during daylight saving time

  • JST does not observe daylight saving time; it stays on UTC+9 all year.
  • MST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from MST (UTC−7) to MDT (UTC−6).

Best time for a meeting between JST and MST

JST and MST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM JST, which is 3:00 PM MST.

Plan a meeting across more time zones.

JST to MST FAQ

What is the time difference between JST and MST?

Right now MST is 16 hours behind JST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.

What is 9 AM JST in MST?

9:00 AM JST is 5:00 PM MST (previous day).

What is 12 PM (noon) JST in MST?

12:00 PM JST is 8:00 PM MST (previous day).

Is MST ahead of or behind JST?

MST is 16 hours behind JST, so it is earlier in MST than in JST.

Does JST change for daylight saving time?

No. JST stays on the same offset all year, so conversions never shift for daylight saving time.

Does MST change for daylight saving time?

Yes. MST next changes on 14 Mar 2027, when clocks go forward one hour from MST to MDT.

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

JST and MST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM JST, which is 3:00 PM MST.

Is MT the same as MST?

MST is the winter (standard) name of Mountain Time (MT). From March to November the same clocks are called MDT. This converter always uses the one in force on the date you choose.

Related conversions

Convert MST to JST

Convert JST to other time zones

Convert other time zones to MST

Learn more

Updated 7 November 2026. Time zone data: IANA tz database.