MST to JST Converter
JST is 16 hours ahead of MST. 9:00 AM MST = 1:00 AM JST (next day).
JST is 16 hours ahead of MST at the moment. To convert MST to JST, add 16 hours to the MST time: 9:00 AM MST = 1:00 AM JST (next day).
MST (Mountain Time) is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year. JST (Japan Time) is used in Japan.
Most of Arizona uses MST all year and does not switch to MDT.
MST to JST time conversion table
MST to JST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| MST | JST | Day |
|---|---|---|
| 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 | night |
| 7:00 AM MST | 11:00 PM JST | night |
| 8:00 AM MST | 12:00 AM JST | next day |
| 9:00 AM MST | 1:00 AM JST | next day |
| 10:00 AM MST | 2:00 AM JST | next day |
| 11:00 AM MST | 3:00 AM JST | next day |
| 12:00 PM MST | 4:00 AM JST | next day |
| 1:00 PM MST | 5:00 AM JST | next day |
| 2:00 PM MST | 6:00 AM JST | next day |
| 3:00 PM MST | 7:00 AM JST | next day |
| 4:00 PM MST | 8:00 AM JST | next day |
| 5:00 PM MST | 9:00 AM JST | next day |
| 6:00 PM MST | 10:00 AM JST | next day |
| 7:00 PM MST | 11:00 AM JST | next day |
| 8:00 PM MST | 12:00 PM JST | next day |
| 9:00 PM MST | 1:00 PM JST | next day |
| 10:00 PM MST | 2:00 PM JST | next day |
| 11:00 PM MST | 3:00 PM JST | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert MST to JST
Add 16 hours to the MST time to get JST.
Example: 9:00 AM MST = 1:00 AM JST (next day).
Across midnight: 10:00 PM MST = 2:00 PM JST (next day). The date changes, so always check the day as well as the hour.
Time difference between MST and JST
The time difference between MST and JST 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:
- 31 Dec 2025 – 7 Mar 2026: JST is 16 hours ahead of MST.
- 8 Mar 2026 – 31 Oct 2026: JST is 15 hours ahead of MST.
- 1 Nov 2026 – 30 Dec 2026: JST is 16 hours ahead of MST.
MST and JST during daylight saving time
- 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).
- JST does not observe daylight saving time; it stays on UTC+9 all year.
Best time for a meeting between MST and JST
MST and JST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 3:00 PM MST, which is 7:00 AM JST.
MST to JST FAQ
What is the time difference between MST and JST?
Right now JST is 16 hours ahead of MST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM MST in JST?
9:00 AM MST is 1:00 AM JST (next day).
What is 12 PM (noon) MST in JST?
12:00 PM MST is 4:00 AM JST (next day).
Is JST ahead of or behind MST?
JST is 16 hours ahead of MST, so it is later in JST than in MST.
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.
Does JST change for daylight saving time?
No. JST stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between MST and JST?
MST and JST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 3:00 PM MST, which is 7:00 AM JST.
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 JST to MST
Convert MST to other time zones
Convert other time zones to JST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.