TimezoneToolbox

MST to JST converter

JST is usually 15 h ahead of MST. It is 16 h ahead of MST 1 Jan–8 Mar and 1 Nov–31 Dec 2026, because of daylight saving time.

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MST to JST table

For 5 July 2026, when JST is 15 h ahead of MST. Other dates: see the table on the right.

MSTJST24-hour
12:00 AM3:00 PM 0:00 → 15:00
1:00 AM4:00 PM 1:00 → 16:00
2:00 AM5:00 PM 2:00 → 17:00
3:00 AM6:00 PM 3:00 → 18:00
4:00 AM7:00 PM 4:00 → 19:00
5:00 AM8:00 PM 5:00 → 20:00
6:00 AM9:00 PM 6:00 → 21:00
7:00 AM10:00 PM 7:00 → 22:00
8:00 AM11:00 PM 8:00 → 23:00
9:00 AM12:00 AM next day9:00 → 0:00
10:00 AM1:00 AM next day10:00 → 1:00
11:00 AM2:00 AM next day11:00 → 2:00
12:00 PM3:00 AM next day12:00 → 3:00
1:00 PM4:00 AM next day13:00 → 4:00
2:00 PM5:00 AM next day14:00 → 5:00
3:00 PM6:00 AM next day15:00 → 6:00
4:00 PM7:00 AM next day16:00 → 7:00
5:00 PM8:00 AM next day17:00 → 8:00
6:00 PM9:00 AM next day18:00 → 9:00
7:00 PM10:00 AM next day19:00 → 10:00
8:00 PM11:00 AM next day20:00 → 11:00
9:00 PM12:00 PM next day21:00 → 12:00
10:00 PM1:00 PM next day22:00 → 13:00
11:00 PM2:00 PM next day23:00 → 14:00

When the difference changes

Computed from the IANA tz database (release 2026c). Governments can change these rules; the live converter uses your browser’s own copy of the database.

2026: from (UTC)until (UTC)JST vs MST
1 January 20268 March 202616 h ahead of
8 March 20261 November 202615 h ahead of
1 November 202631 December 202616 h ahead of
2027: from (UTC)until (UTC)JST vs MST
1 January 202714 March 202716 h ahead of
14 March 20277 November 202715 h ahead of
7 November 202731 December 202716 h ahead of

MST: Mountain Time · MST time now
Arizona (America/Phoenix) stays on MST all year, so for part of the year it matches Pacific Time instead of Denver.

JST: Japan Standard Time · JST time now
Japan

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Questions

What is the time difference between MST and JST?

JST is usually 15 h ahead of MST. It is 16 h ahead of MST 1 Jan–8 Mar and 1 Nov–31 Dec 2026, because of daylight saving time.

What is 9 am MST in JST?

9:00 am MST is 12:00 AM JST the next day, on dates when the usual difference applies. Use the converter above for any specific date.

Which MST does this page use?

Arizona (America/Phoenix) stays on MST all year, so for part of the year it matches Pacific Time instead of Denver.

Which JST does this page use?

Japan Standard Time, the clock time in Japan (IANA zone Asia/Tokyo).