JST → MST Converter
Japan to Mountain West — manufacturing and tech coordination.
JST → MST
3:40 AM
Japan Standard Time (GMT+9)
Friday, June 12, 2026
UTC+9 (DST active)
12:40 PM
Mountain Daylight Time (MDT)
Thursday, June 11, 2026
UTC-6 (DST active)
Time Zone Converter
JST·Tokyo
3:40 AM
Friday, June 12, 2026
MST·Denver
12:40 PM
Thursday, June 11, 2026
Compare Times
| JST | MST |
|---|
Morning
| JST | MST |
|---|---|
| 12:00 AM JST | 8:00 AM MST |
| 1:00 AM JST | 9:00 AM MST |
| 2:00 AM JST | 10:00 AM MST |
| 3:00 AM JST | 11:00 AM MST |
| 4:00 AM JST | 12:00 PM MST |
| 5:00 AM JST | 1:00 PM MST |
| 6:00 AM JST | 2:00 PM MST |
| 7:00 AM JST | 3:00 PM MST |
| 8:00 AM JST | 4:00 PM MST |
| 9:00 AM JST | 5:00 PM MST |
| 10:00 AM JST | 6:00 PM MST |
| 11:00 AM JST | 7:00 PM MST |
Afternoon
| JST | MST |
|---|---|
| 12:00 PM JST | 8:00 PM MST |
| 1:00 PM JST | 9:00 PM MST |
| 2:00 PM JST | 10:00 PM MST |
| 3:00 PM JST | 11:00 PM MST |
| 4:00 PM JST | 12:00 AM MST |
Evening
| JST | MST |
|---|---|
| 5:00 PM JST | 1:00 AM MST |
| 6:00 PM JST | 2:00 AM MST |
| 7:00 PM JST | 3:00 AM MST |
| 8:00 PM JST | 4:00 AM MST |
| 9:00 PM JST | 5:00 AM MST |
| 10:00 PM JST | 6:00 AM MST |
| 11:00 PM JST | 7:00 AM MST |
Frequently Asked Questions: JST to MST
What is the time difference between Japan Standard Time and Mountain Time?
MST is 16 hours behind JST (standard time).
What time is midnight in JST in MST?
Midnight (12:00 AM) in Japan Standard Time translates to 8:00 AM MST in Mountain Time.
When do business hours overlap between JST and MST?
Standard 9–5 business hours do not overlap between Japan Standard Time and Mountain Time. The closest scheduling window is 20:00–21:00 JST (04:00–05:00 MST).
Common Time Conversions
EST · New York →
CST · Chicago →
MST · Denver →
PST · Los Angeles →
AKST · Anchorage →
HST · Honolulu →
UTC · Universal →
GMT · London →
IST · New Delhi →
CET · Paris →
How Time Zone Conversion Works
Time zone conversion works by comparing the UTC offset of one location to another. Every city or region is measured relative to Coordinated Universal Time (UTC), which acts as the global reference point for civil time.
MST is 16 hours behind JST (standard time).
Daylight Saving Time: MST observes DST; JST does not. The offset between them shifts by 1 hour twice a year — in spring and autumn — when MST changes its clocks.
Best time to call Denver from Tokyo
Planning a remote meeting or international call? The optimal business hours overlap between Tokyo and Denver is challenging, with few shared business hours between the two zones.
Try Meeting Planner for multi-city group scheduling →JST
20:00–21:00
Japan Time
MST
04:00–05:00
Mountain Time
Recommended time: 20:00 JST / 04:00 MST
DST schedule for 2026
Current-year daylight saving start and end dates for the selected zones.
JST · Japan Time
Standard offset +09:00
Japan Time remains on a constant standard offset for the year.
Japan has not observed daylight saving time since 1951.
MST · Mountain Time
Standard offset −07:00
- Starts
- Mar 8, 2026 · 02:00 → 03:00
- second_sunday_of_march
- Ends
- Nov 1, 2026 · 02:00 → 01:00
- first_sunday_of_november
- Daylight time
- MDT · −06:00
Most of Arizona stays on MST year-round (does not observe DST). The Navajo Nation within Arizona does observe DST.
Principal Cities
JST — Japan Time
- TokyoJapan
- YokohamaJapan
- OsakaJapan
- NagoyaJapan
MST — Mountain Time
- PhoenixUnited States
- CalgaryCanada
- EdmontonCanada
- DenverUnited States