JST to MST Converter
Mountain Time (MST / MDT) is 15 hours behind Japan Time (JST).
Quick Reference
- Japan Time
- JST (GMT+9)
No Daylight Saving Time
- Mountain Time
- MDT (GMT-6)
MST starts on Nov 1, 2026
Cities in JST
Cities in MST
Frequently Asked Questions
- What is the difference between JST and MST?
- MST is 15 hours behind JST.
- How do I convert JST to MST?
- To convert from JST to MST, subtract 15 hours. Use the interactive converter on this page to convert specific times.
- What cities are in JST and MST?
- Cities in JST include Tokyo, Yokohama, Osaka, Nagoya, Sapporo. Cities in MST include Denver, El Paso, Albuquerque, Colorado Springs, Salt Lake City.