Japan Standard Time to US Mountain Time
Convert times between Japan Standard Time (JST, UTC+9:00) and US Mountain Time (MST, UTC-7:00). US Mountain Time is 16 hours behind Japan Standard Time in standard time. During daylight saving time this difference changes to 15 hours.
UTC+9:00→UTC-7:00 / -6:00
Live timezone converterUTC Offset Reference
| Timezone | Abbreviation | Standard offset | DST offset | Country |
|---|---|---|---|---|
| Japan Standard Time | JST | UTC+9:00 | — | Japan |
| US Mountain Time | MST / MDT | UTC-7:00 | UTC-6:00 | United States |
* DST offset applies during summer months. Exact transition dates vary by year.
Standard Time Conversion (JST → MST)
| Japan Standard Time | US Mountain Time |
|---|---|
| 12:00 AM JST | 8:00 AM (prev day) MST |
| 6:00 AM JST | 2:00 PM (prev day) MST |
| 9:00 AM JST | 5:00 PM (prev day) MST |
| 12:00 PM JST | 8:00 PM (prev day) MST |
| 3:00 PM JST | 11:00 PM (prev day) MST |
| 6:00 PM JST | 2:00 AM MST |
| 9:00 PM JST | 5:00 AM MST |
Summer (DST) Conversion (JST → MDT)
| Japan Standard Time (summer) | US Mountain Time (summer) |
|---|---|
| 12:00 AM JST | 9:00 AM (prev day) MDT |
| 6:00 AM JST | 3:00 PM (prev day) MDT |
| 9:00 AM JST | 6:00 PM (prev day) MDT |
| 12:00 PM JST | 9:00 PM (prev day) MDT |
| 3:00 PM JST | 12:00 AM MDT |
| 6:00 PM JST | 3:00 AM MDT |
| 9:00 PM JST | 6:00 AM MDT |
Daylight Saving Time (DST) Notes
- US Mountain Time observes DST. Clocks advance 1 hour to MDT (UTC-6:00) roughly from month 3 to 11.
- The offset difference shifts between 16h (standard) and 15h (DST season). Always verify the current offset using the live converter below.
Frequently Asked Questions
How do I convert JST to MST?
Add (-16) hours to the JST time to get MST. For example, 9:00 AM JST = 5:00 PM MST.
What is the current UTC offset for Japan Standard Time?
Japan Standard Time is always UTC+9:00 (JST) — it does not observe DST.
Is US Mountain Time ahead or behind Japan Standard Time?
US Mountain Time is 16 hours behind Japan Standard Time in standard time.
When is a good time to schedule a meeting between JST and MST?
A good overlap window is around 9:00 AM JST / 5:00 PM (prev day) MST, which falls within business hours for both timezones.
Related Timezone Conversions
Japan Standard Time → US Eastern TimeJST / ESTJapan Standard Time → US Central TimeJST / CSTJapan Standard Time → US Pacific TimeJST / PSTJapan Standard Time → US Alaska TimeJST / AKSTJapan Standard Time → Hawaii TimeJST / HSTJapan Standard Time → Canada Atlantic TimeJST / ASTJapan Standard Time → China Standard TimeJST / CSTJapan Standard Time → Hong Kong TimeJST / HKT
Need the exact current time?
Use the live ToolsHub timezone converter to see current times, DST status, and schedule across time zones.