TimezoneToolbox

JST to MST converter

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

Loading converter…

JST to MST table

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

JSTMST24-hour
12:00 AM9:00 AM prev. day0:00 → 9:00
1:00 AM10:00 AM prev. day1:00 → 10:00
2:00 AM11:00 AM prev. day2:00 → 11:00
3:00 AM12:00 PM prev. day3:00 → 12:00
4:00 AM1:00 PM prev. day4:00 → 13:00
5:00 AM2:00 PM prev. day5:00 → 14:00
6:00 AM3:00 PM prev. day6:00 → 15:00
7:00 AM4:00 PM prev. day7:00 → 16:00
8:00 AM5:00 PM prev. day8:00 → 17:00
9:00 AM6:00 PM prev. day9:00 → 18:00
10:00 AM7:00 PM prev. day10:00 → 19:00
11:00 AM8:00 PM prev. day11:00 → 20:00
12:00 PM9:00 PM prev. day12:00 → 21:00
1:00 PM10:00 PM prev. day13:00 → 22:00
2:00 PM11:00 PM prev. day14:00 → 23:00
3:00 PM12:00 AM 15:00 → 0:00
4:00 PM1:00 AM 16:00 → 1:00
5:00 PM2:00 AM 17:00 → 2:00
6:00 PM3:00 AM 18:00 → 3:00
7:00 PM4:00 AM 19:00 → 4:00
8:00 PM5:00 AM 20:00 → 5:00
9:00 PM6:00 AM 21:00 → 6:00
10:00 PM7:00 AM 22:00 → 7:00
11:00 PM8:00 AM 23:00 → 8:00

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

JST: Japan Standard Time · JST time now
Japan

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.

Related converters

Questions

What is the time difference between JST and MST?

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

What is 9 am JST in MST?

9:00 am JST is 6:00 PM MST the previous day, on dates when the usual difference applies. Use the converter above for any specific date.

Which JST does this page use?

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

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.