JST to MST Converter
MST is 16 hours behind JST
JST to MST Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in MST
| JST | MST |
|---|---|
| 12:00 AM | 8:00 AM -1d |
| 1:00 AM | 9:00 AM -1d |
| 2:00 AM | 10:00 AM -1d |
| 3:00 AM | 11:00 AM -1d |
| 4:00 AM | 12:00 PM -1d |
| 5:00 AM | 1:00 PM -1d |
| 6:00 AM | 2:00 PM -1d |
| 7:00 AM | 3:00 PM -1d |
| 8:00 AM | 4:00 PM -1d |
| 9:00 AM | 5:00 PM -1d |
| 10:00 AM | 6:00 PM -1d |
| 11:00 AM | 7:00 PM -1d |
| 12:00 PM | 8:00 PM -1d |
| 1:00 PM | 9:00 PM -1d |
| 2:00 PM | 10:00 PM -1d |
| 3:00 PM | 11:00 PM -1d |
| 4:00 PM | 12:00 AM |
| 5:00 PM | 1:00 AM |
| 6:00 PM | 2:00 AM |
| 7:00 PM | 3:00 AM |
| 8:00 PM | 4:00 AM |
| 9:00 PM | 5:00 AM |
| 10:00 PM | 6:00 AM |
| 11:00 PM | 7:00 AM |
Converting Japan Standard Time to Mountain Standard Time
Japan Standard Time (JST) and Mountain Standard Time (MST) are separated by a 16 hours time difference. MST is 16 hours behind JST. JST is UTC+9, used in Japan, while MST is UTC-7, used in United States, Canada.
When converting from JST to MST, the key reference points to remember are: 9:00 AM JST equals 5:00 PM MST, 12:00 PM noon JST equals 8:00 PM MST, and 5:00 PM JST equals 1:00 AM MST. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across JST and MST
For professionals scheduling meetings between JST and MST, finding overlapping business hours is essential. Standard business hours are typically 9:00 AM to 5:00 PM in each time zone. Given the 16 hours difference, the window of overlap may be limited, making early morning or late evening calls necessary for one party. Use the highlighted working hours in the conversion table above to quickly identify suitable meeting times.
Daylight Saving Time Considerations
JST does not observe Daylight Saving Time, maintaining UTC+9 year-round. MST observes DST, switching to MDT (UTC-6). During DST transitions, the time difference between these zones may temporarily change by 1 hour. Always verify the current offset during spring and fall transition periods.