Convert time from JST to MDT. Enter any time to see the equivalent MDT time, compare current JST and MDT times side by side, and find overlapping business hours for calls and meetings.
Use this JST to MDT converter to compare Japan and US Mountain time, check the 15 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Find the best overlap for calls and meetings.
Converting between Japan Standard Time and Mountain Daylight Time means accounting for a 15 hours gap — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Japan Standard Time (UTC +9) that you want to convert. Hit "Now" to load the current jst time instantly, or use "+1h" to step forward and compare.
The equivalent Mountain Daylight Time (UTC -6) time appears immediately. Since mdt is 15 hours behind of jst, conversions often cross midnight — look for the date-change label.
Click "Copy Time" to grab the mdt result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — helpful for scheduling recurring Japan–United States calls.
With 15 hours between jst and mdt, business-hours overlap is limited. This tool instantly shows which hours work on both sides, so you can lock in a meeting without a chain of "does 3 PM work for you?" emails.
A jst evening at 9 PM is already the previous afternoon in mdt. This converter flags date changes beside the result — critical when booking flights, hitting deadlines, or scheduling across the Japan–United States corridor.
Daylight Saving adjustments can widen or narrow the jst–mdt gap by an hour. During transition weeks many people get it wrong. This converter pulls the current UTC offsets automatically, so the result is right even on the changeover day.
Product launches, sports matches, and webinars are often announced in jst. Convert the event time to mdt so you know exactly when to tune in — with a 15 hours difference, a morning event in Japan hits the evening in United States.
Quick-reference conversion table covering every hour of the day at a glance.
Japan Standard Time to Mountain Daylight Time full day schedule
| Japan Standard Time | Mountain Daylight Time |
|---|---|
| 12:00 AM |
9:00 AM
(previous day)
|
| 1:00 AM |
10:00 AM
(previous day)
|
| 2:00 AM |
11:00 AM
(previous day)
|
| 3:00 AM |
12:00 PM
(previous day)
|
| 4:00 AM |
1:00 PM
(previous day)
|
| 5:00 AM |
2:00 PM
(previous day)
|
| 6:00 AM |
3:00 PM
(previous day)
|
| 7:00 AM |
4:00 PM
(previous day)
|
| 8:00 AM |
5:00 PM
(previous day)
|
| 9:00 AM |
6:00 PM
(previous day)
|
| 10:00 AM |
7:00 PM
(previous day)
|
| 11:00 AM |
8:00 PM
(previous day)
|
| 12:00 PM |
9:00 PM
(previous day)
|
| 1:00 PM |
10:00 PM
(previous day)
|
| 2:00 PM |
11:00 PM
(previous day)
|
| 3:00 PM |
12:00 AM
|
| 4:00 PM |
1:00 AM
|
| 5:00 PM |
2:00 AM
|
| 6:00 PM |
3:00 AM
|
| 7:00 PM |
4:00 AM
|
| 8:00 PM |
5:00 AM
|
| 9:00 PM |
6:00 AM
|
| 10:00 PM |
7:00 AM
|
| 11:00 PM |
8:00 AM
|
Japan — one of the few large economies that has no DST, so JST is JST year-round (UTC+9). Business hours 9 AM – 6 PM JST with strong presence-based culture (staying past 7 PM is common). Same offset as Korean Standard Time (KST).
Explore more jst conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.
Find the time difference from any major zone into Mountain Daylight Time. Use these pages when scheduling with United States from a different region.
