MST to JST — Time Zone Converter
Mountain Time (MST, UTC−7) covers the US Mountain states; Japan Standard Time (JST, UTC+9) covers Japan. In standard time, JST is 16 hours ahead of MST. Standard working days in the US Mountain states and Japan barely overlap, so most teams alternate who takes the early-morning or late-evening slot. Use the live converter below — it applies today's IANA time zone data, including daylight saving time, and gives you a meeting schedule you can paste straight into email or Slack.
MST to JST, hour by hour (today)
Frequently asked questions
What is the time difference between MST and JST?+
Mountain Time (MST) is UTC−7 and Japan Standard Time (JST) is UTC+9, so in standard time JST is 16 hours ahead of MST. The gap shifts by an hour around daylight saving transitions, so always check a live converter near the change dates in spring and autumn.
Does MST or JST observe daylight saving time?+
Mountain Time observes daylight saving time (MST in winter, MDT in summer). Japan Standard Time stays on UTC+9 all year — no daylight saving time.
What is the best time for a meeting between MST and JST?+
Standard working days in the US Mountain states and Japan barely overlap, so most teams alternate who takes the early-morning or late-evening slot. The converter above highlights office hours in green for both zones, so you can slide to a time that works for everyone.
How do I share a MST to JST meeting time by email?+
Pick a time in the converter, log it to the Smart Clipboard, and copy it as bullets, a formatted table, or a one-line question — with both MST and JST times spelled out so nobody has to do the math.