JST to MST converter

Japan Time (Tokyo, Osaka) to Mountain Time (Denver, Salt Lake City, Calgary).

JST9:07 AMSat 31 Oct 2026

→

MST6:07 PMFri 30 Oct 2026

MST is 15 h behind JST.

Pick a time in JST

⇄ MST to JST

9:00 AM JST = 6:00 PM MST previous day

Best time to meet

No hour falls inside 9 AM to 5 PM in both places. The least painful: around 7:00 AM JST, which is 4:00 PM MST.

JST to MST time table

For 31 Oct 2026. Green rows: both sides between 9 AM and 5 PM.

JST	MST
12:00 AM JST	9:00 AM MST previous day
1:00 AM JST	10:00 AM MST previous day
2:00 AM JST	11:00 AM MST previous day
3:00 AM JST	12:00 PM MST previous day
4:00 AM JST	1:00 PM MST previous day
5:00 AM JST	2:00 PM MST previous day
6:00 AM JST	3:00 PM MST previous day
7:00 AM JST	4:00 PM MST previous day
8:00 AM JST	5:00 PM MST previous day
9:00 AM JST	6:00 PM MST previous day
10:00 AM JST	7:00 PM MST previous day
11:00 AM JST	8:00 PM MST previous day
12:00 PM JST	9:00 PM MST previous day
1:00 PM JST	10:00 PM MST previous day
2:00 PM JST	11:00 PM MST previous day
3:00 PM JST	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	7:00 AM MST
11:00 PM JST	8:00 AM MST

Quick answers

9:00 AM JST = 6:00 PM MST (previous day)
12:00 PM JST = 9:00 PM MST (previous day)
3:00 PM JST = 12:00 AM MST
5:00 PM JST = 2:00 AM MST
9:00 AM MST = 12:00 AM JST (next day)
12:00 PM MST = 3:00 AM JST (next day)
5:00 PM MST = 8:00 AM JST (next day)

Does the gap change during the year?

Yes, because of daylight saving. Until 1 Nov 2026: MST is 15 h behind JST. From 1 Nov 2026 to 14 Mar 2027: MST is 16 h behind JST. From 14 Mar 2027 to 7 Nov 2027: MST is 15 h behind JST.

JST does not change its clocks. MST next changes its clocks on 1 Nov 2026 (back 1 h, to UTC−7), then on 14 Mar 2027 (forward 1 h, to UTC−6).

About JST and MST

JST here means Japan Time, the clock in Tokyo, Osaka. Right now it is UTC+9. It has no daylight saving.

MST here means Mountain Time, the clock in Denver, Salt Lake City, Calgary. Right now it is UTC−6. Strictly, MST is the winter name; in summer these places use MDT. This page follows their real clock all year.

Every city on your wrist

Meanwhile puts these times in your Mac menu bar, on your iPhone home screen and on your Apple Watch. Type “3pm Tokyo” and every city answers. Free for 3 cities. Unlock every city on every device once for $4.99, shared with your family. No subscription.

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