Convert MST to JST — Time Difference Between Mountain Standard Time and Japan Standard Time

How to Convert MST to JST

Drag the slider on the MST timeline to pick your time — the JST time updates instantly. You can also click the time display to type a specific hour or pick one from the 15-minute interval dropdown, and use the date picker to check a different day.

What Is the Time Difference Between MST and JST?

Japan Standard Time (JST) is 16 hours ahead of Mountain Standard Time (MST). To convert, add 16 hours — for example, 9:00 AM MST is 1:00 AM (next day) JST.

MST to JST Quick Reference

MST to JST Meeting Planner

Use the color-coded table above to find overlapping work hours between Phoenix and Tokyo. Amber rows mark daytime hours — pick a slot that falls in amber on both sides for a meeting that works for everyone.

Why Trust This MST to JST Converter?

Timezoney uses the IANA Time Zone Database — the same source that powers your phone and computer — so every conversion handles daylight saving transitions and half-hour offsets automatically.