Time in JST and MDT
The time difference between Japan Standard Time (JST) and Mountain Daylight Time (MDT) is 15 hours. Mountain Daylight Time is 15 hours behind Japan Standard Time.
This means 9am JST is 6pm MDT (previous day) and 5pm JST is 2am MDT.
Japan Standard Time
- The current local time in JST is 4:07 am (July 9, 2026)
- JST time zone offset is UTC+09:00
Mountain Daylight Time
- The current local time in MDT is 1:07 am (July 9, 2026)
- MDT time zone offset is UTC-06:00
How to convert Japan Standard Time to Mountain Daylight Time?
Subtract 15 hours from Japan Standard Time to get Mountain Daylight Time.
Time in JST
00:00
Time in MDT
00:00
Use the slider above to convert Japan Standard Time to Mountain Daylight Time and view the day and night map at different times.
Day–night colors on the map:
Day
Civil twilight
Nautical twilight
Astronomical twilight
NightTime Conversion Chart
| JST | MDT |
|---|---|
| 12am | 9am |
| 1am | 10am |
| 2am | 11am |
| 3am | 12pm |
| 4am | 1pm |
| 5am | 2pm |
| 6am | 3pm |
| 7am | 4pm |
| 8am | 5pm |
| 9am | 6pm |
| 10am | 7pm |
| 11am | 8pm |
| 12pm | 9pm |
| 1pm | 10pm |
| 2pm | 11pm |
| 3pm | 12am |
| 4pm | 1am |
| 5pm | 2am |
| 6pm | 3am |
| 7pm | 4am |
| 8pm | 5am |
| 9pm | 6am |
| 10pm | 7am |
| 11pm | 8am |