This simple JST to MDT time zone converter allows you to quickly and visually understand the time difference between JST (JST) and MDT (MDT).
12:31 AM MDT
JST: UTC+09:00 · MDT: UTC-06:00
Just hover over the colored hour tiles, and you’ll instantly see the corresponding time in both zones. The time difference between JST and MDT is 15 hours 0 minutes, with JST being ahead. For example, if it is 3:31 PM JST, the equivalent time in MDT will be 12:31 AM MDT.
| Japan Standard Time | Mountain Daylight Time |
|---|---|
| 00:00 JST | 09:00 (-1) MDT |
| 00:30 JST | 09:30 (-1) MDT |
| 01:00 JST | 10:00 (-1) MDT |
| 01:30 JST | 10:30 (-1) MDT |
| 02:00 JST | 11:00 (-1) MDT |
| 02:30 JST | 11:30 (-1) MDT |
| 03:00 JST | 12:00 (-1) MDT |
| 03:30 JST | 12:30 (-1) MDT |
| 04:00 JST | 13:00 (-1) MDT |
| 04:30 JST | 13:30 (-1) MDT |
| 05:00 JST | 14:00 (-1) MDT |
| 05:30 JST | 14:30 (-1) MDT |
| 06:00 JST | 15:00 (-1) MDT |
| 06:30 JST | 15:30 (-1) MDT |
| 07:00 JST | 16:00 (-1) MDT |
| 07:30 JST | 16:30 (-1) MDT |
| 08:00 JST | 17:00 (-1) MDT |
| 08:30 JST | 17:30 (-1) MDT |
| 09:00 JST | 18:00 (-1) MDT |
| 09:30 JST | 18:30 (-1) MDT |
| 10:00 JST | 19:00 (-1) MDT |
| 10:30 JST | 19:30 (-1) MDT |
| 11:00 JST | 20:00 (-1) MDT |
| 11:30 JST | 20:30 (-1) MDT |
| 12:00 JST | 21:00 (-1) MDT |
| 12:30 JST | 21:30 (-1) MDT |
| 13:00 JST | 22:00 (-1) MDT |
| 13:30 JST | 22:30 (-1) MDT |
| 14:00 JST | 23:00 (-1) MDT |
| 14:30 JST | 23:30 (-1) MDT |
| 15:00 JST | 00:00 MDT |
| 15:30 JST | 00:30 MDT |
| 16:00 JST | 01:00 MDT |
| 16:30 JST | 01:30 MDT |
| 17:00 JST | 02:00 MDT |
| 17:30 JST | 02:30 MDT |
| 18:00 JST | 03:00 MDT |
| 18:30 JST | 03:30 MDT |
| 19:00 JST | 04:00 MDT |
| 19:30 JST | 04:30 MDT |
| 20:00 JST | 05:00 MDT |
| 20:30 JST | 05:30 MDT |
| 21:00 JST | 06:00 MDT |
| 21:30 JST | 06:30 MDT |
| 22:00 JST | 07:00 MDT |
| 22:30 JST | 07:30 MDT |
| 23:00 JST | 08:00 MDT |
| 23:30 JST | 08:30 MDT |
UTC+09:00
Fixed UTC offset. For seasonal local time, select a city or ET, CT, MT, PT.
JST · UTC+09:00
UTC-06:00
Fixed UTC offset. For seasonal local time, select a city or ET, CT, MT, PT.
MDT · UTC-06:00
2026-10-19 · JST ahead of MDT: 15 hours 0 minutes. JST: UTC+09:00; MDT: UTC-06:00.
2026-10-19 · 15:31 JST → 00:31 MDT.
Weekday overlap (Mon–Fri, 09:00–17:00 in both places): No overlapping working hours on this source date.
JST ahead of MDT: 15 hours 0 minutes
Date → Select range → .ics. 2026-10-19 · 15:31 JST → 00:31 MDT.
JST: Fixed UTC offset. For seasonal local time, select a city or ET, CT, MT, PT. MDT: Fixed UTC offset. For seasonal local time, select a city or ET, CT, MT, PT.