MST to JST Time Converter - Live World Clock

Convert time between Mountain Standard Time (MST) and Japan Standard Time (JST). See current time with live clocks.

United States (MST)

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11:27:45 AM
Thursday, August 20, 2026

Japan (JST)

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02:27:45 AM
Friday, August 21, 2026

Current Time Difference

MST is -16 hours behind JST

What is MST (Mountain Standard Time)?

Mountain Standard Time (MST) used in western North America, UTC-7:00.

Countries and Regions Using MST

Primary Country:

  • United States
  • States: Colorado, Arizona, Utah, New Mexico

Also Used By:

  • Canada - Alberta
  • Mexico

Key Facts about MST:

  • ✓ Arizona doesn't observe DST
  • ✓ Major mountain resort areas
  • ✓ Growing tech hub in Denver
  • ✓ Major Cities: Denver, Phoenix, Albuquerque, Salt Lake City
  • ✓ UTC Offset: -7:00 (-6:00 during MDT)

What is JST (Japan Standard Time)?

Japan Standard Time (JST) used in Japan, UTC+9:00.

Countries and Regions Using JST

Primary Country:

  • Japan

Also Used By:

  • South Korea

Key Facts about JST:

  • ✓ Third largest economy
  • ✓ Major tech center
  • ✓ No DST observed
  • ✓ Major Cities: Tokyo, Osaka, Yokohama, Nagoya
  • ✓ UTC Offset: +9:00

MST to JST Time Difference

Standard Time Difference:

MST is -16 hours behind

Common Use Cases:

  • • Business meetings between United States and Japan
  • • International collaboration across timezones
  • • Scheduling calls and conferences

Frequently Asked Questions

Which countries are in MST time zone?

United States is the primary country using MST (-7:00). Other countries include: Canada, Mexico.

Which countries are in JST time zone?

Japan is the primary country using JST (+9:00). Other countries include: South Korea.

How many hours is MST ahead of JST?

MST is -16 hours behind JST.

Does United States observe Daylight Saving Time?

Yes, United States observes Daylight Saving Time. During DST, MST changes to MDT (Mountain Daylight Time) with UTC offset of -6:00.