MST to JST converter
Mountain Time (MST) is typically 16 hours behind Japan Standard Time (JST).
Mountain Time → Japan Standard Time, hour by hour below.
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Mountain Time (MST) is UTC−7 and observes daylight saving (MDT, UTC−6, roughly March–November). It covers Denver, Salt Lake City and Calgary.
Japan Standard Time (JST) is UTC+9 with no daylight saving. It covers Tokyo, Osaka and Sapporo (Seoul shares the same clock).
Japan Standard Time is typically 16 hours ahead of Mountain Time, though daylight saving can shift the difference by an hour at some times of year.
Time difference between Mountain Time and Japan Standard Time
Japan Standard Time is typically 16 hours ahead of Mountain Time, though daylight saving can shift the difference by an hour at some times of year. Put the other way around: japan Standard Time (JST) is typically 16 hours ahead of Mountain Time (MST). The table above shows the difference hour by hour using today's actual offsets.
Best time to call Japan Standard Time from Mountain Time
There's no 9-to-5 overlap between Mountain Time and Japan Standard Time, so one side always has to flex. The practical slots: 6:00 PM in Mountain Time is 10:00 AM in Japan Standard Time. Daylight saving can shift these times by an hour at some points in the year.
MST to JST, hour by hour
Today's actual offsets. Rows where both zones are inside 9am–5pm working hours are highlighted.