JST to MDT time
When it is 3:40 PM in JST (GMT+9), it is 12:40 AM in MDT (GMT-6).
JST is usually 15 hours ahead of MDT. From 1 November 2026 to 14 March 2027 the gap widens to 16 hours. From 7 November 2027 to 12 March 2028 the gap widens to 16 hours.
Good meeting window (08:00-18:00 both sides): 08:00-09:00 in JST = 17:00-18:00 in MDT.
JST to MDT
| JST | MDT |
|---|---|
| 00:00 | 09:00 (prev day) |
| 01:00 | 10:00 (prev day) |
| 02:00 | 11:00 (prev day) |
| 03:00 | 12:00 (prev day) |
| 04:00 | 13:00 (prev day) |
| 05:00 | 14:00 (prev day) |
| 06:00 | 15:00 (prev day) |
| 07:00 | 16:00 (prev day) |
| 08:00 | 17:00 (prev day) |
| 09:00 | 18:00 (prev day) |
| 10:00 | 19:00 (prev day) |
| 11:00 | 20:00 (prev day) |
| 12:00 | 21:00 (prev day) |
| 13:00 | 22:00 (prev day) |
| 14:00 | 23:00 (prev day) |
| 15:00 | 00:00 |
| 16:00 | 01:00 |
| 17:00 | 02:00 |
| 18:00 | 03:00 |
| 19:00 | 04:00 |
| 20:00 | 05:00 |
| 21:00 | 06:00 |
| 22:00 | 07:00 |
| 23:00 | 08:00 |
MDT to JST
| MDT | JST |
|---|---|
| 00:00 | 15:00 |
| 01:00 | 16:00 |
| 02:00 | 17:00 |
| 03:00 | 18:00 |
| 04:00 | 19:00 |
| 05:00 | 20:00 |
| 06:00 | 21:00 |
| 07:00 | 22:00 |
| 08:00 | 23:00 |
| 09:00 | 00:00 (next day) |
| 10:00 | 01:00 (next day) |
| 11:00 | 02:00 (next day) |
| 12:00 | 03:00 (next day) |
| 13:00 | 04:00 (next day) |
| 14:00 | 05:00 (next day) |
| 15:00 | 06:00 (next day) |
| 16:00 | 07:00 (next day) |
| 17:00 | 08:00 (next day) |
| 18:00 | 09:00 (next day) |
| 19:00 | 10:00 (next day) |
| 20:00 | 11:00 (next day) |
| 21:00 | 12:00 (next day) |
| 22:00 | 13:00 (next day) |
| 23:00 | 14:00 (next day) |
Open JST and MDT in the live time-zone app
Time zone rules: IANA tzdb 2026b (pages); the live app uses your device's own rules. About accuracy