Denver
Tokyo
Convert MST to JST
Mountain Standard Time to Japan Standard Time — Tokyo is 15 hours ahead of Denver
Quick Facts
Time Difference
+15 hours
MST Full Name
Mountain Standard Time
JST Full Name
Japan Standard Time
MST to JST Conversion Table
Related Conversions
About MST and JST Time Zones
MST (Mountain Standard Time) is UTC-7 and covers cities like Denver, Phoenix, Salt Lake City. JST (Japan Standard Time) is UTC+9 and covers cities like Tokyo, Osaka, Kyoto.
When it's 12:00 PM (noon) in Denver (MST), it's 3:00 AM in Tokyo (JST). The time difference between MST and JST is 15 hours — Tokyo is ahead of Denver.
With a 16-hour gap, scheduling overlap is very limited. Early morning in Denver (6–8 AM) corresponds to evening or late night in Tokyo.
Daylight Saving Time
MST observes Daylight Saving Time and becomes MDT (Mountain Daylight Time) during summer months, shifting clocks forward by 1 hour to UTC-6.
During DST transitions, the time difference between MST and JST may shift by ±1 hour. Always verify the current offset above for the most accurate conversion.
Use our world clock tool to compare Denver and Tokyo with a visual timeline, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between MST and JST?
Tokyo (JST) is 15 hours ahead of Denver (MST). The offset is +15 hours.
Is JST ahead or behind MST?
JST is 15 hours ahead of MST. MST is UTC-6 and JST is UTC+9.
When it's 12:00 PM in Denver, what time is it in Tokyo?
When it's 12:00 PM (noon) in Denver (MST), it's 3:00 AM in Tokyo (JST).
When it's 5:00 PM in Denver, what time is it in Tokyo?
When it's 5:00 PM in Denver (MST), it's 8:00 AM in Tokyo (JST).
Does MST change for Daylight Saving Time?
Yes. MST (Mountain Standard Time, UTC-7) becomes MDT (Mountain Daylight Time, UTC-6) in summer, shifting clocks forward 1 hour.