From
JST
Time Converter
JST to MST Time Converter
Convert Japan Time to Mountain Time with a live clock and clean permalinks.
To
MST / MDT
When it is 7:30 AM in Japan Time, it is 4:30 PM in Mountain Time.
JST to MST at a glance
Mountain Time is 15 hours behind Japan Time. If someone gives you a time in Japan Time, move the clock by 15 hours to read it in Mountain Time. A 9:00 AM start in Tokyo becomes 6:00 PM in Denver.
What Japan Time covers
Japan Time is used throughout Japan. Tokyo follows it year-round without daylight saving changes. It is helpful for manufacturing, gaming, and business coordination with Japan-based teams.
What Mountain Time covers
Mountain Time is used across the US and Canada in cities such as Denver and Calgary. It is useful when you work with logistics, field teams, or regional teams across the western half of North America.
Quick answers
What is the time difference between JST and MST?
Mountain Time is 15 hours behind Japan Time.
What happens to a 3:00 PM meeting in JST?
It lands at 12:00 AM in MST.
Does daylight saving time matter for JST to MST?
Japan Time and Mountain Time are shown using the offsets that are active right now, so the result already reflects any daylight saving change in effect today.