JST to MST Time Converter
Compare JST and MST instantly. The clocks below stay in sync with the IANA time-zone database, so daylight-saving transitions are handled automatically for both Tokyo and Denver.
24-Hour Comparison Timeline
Green = working hours · Yellow = early/late · Red = night
24-hour reference table
| JST (Tokyo) | MST (Denver) |
|---|---|
| 12:00 AM | 09:00 AM(Fri, Jul 24) |
| 01:00 AM | 10:00 AM(Fri, Jul 24) |
| 02:00 AM | 11:00 AM(Fri, Jul 24) |
| 03:00 AM | 12:00 PM(Fri, Jul 24) |
| 04:00 AM | 01:00 PM(Fri, Jul 24) |
| 05:00 AM | 02:00 PM(Fri, Jul 24) |
| 06:00 AM | 03:00 PM(Fri, Jul 24) |
| 07:00 AM | 04:00 PM(Fri, Jul 24) |
| 08:00 AM | 05:00 PM(Fri, Jul 24) |
| 09:00 AM | 06:00 PM(Fri, Jul 24) |
| 10:00 AM | 07:00 PM(Fri, Jul 24) |
| 11:00 AM | 08:00 PM(Fri, Jul 24) |
| 12:00 PM | 09:00 PM(Fri, Jul 24) |
| 01:00 PM | 10:00 PM(Fri, Jul 24) |
| 02:00 PM | 11:00 PM(Fri, Jul 24) |
| 03:00 PM | 12:00 AM |
| 04:00 PM | 01:00 AM |
| 05:00 PM | 02:00 AM |
| 06:00 PM | 03:00 AM |
| 07:00 PM | 04:00 AM |
| 08:00 PM | 05:00 AM |
| 09:00 PM | 06:00 AM |
| 10:00 PM | 07:00 AM |
| 11:00 PM | 08:00 AM |
Daylight saving time
Denver observes daylight saving time; Tokyo does not. Expect a one-hour swing when Denver starts or ends DST.
Working-hours overlap
Standard 9-to-5 hours in Tokyo and Denver do not overlap. Use an early or late slot on one side.
Frequently asked questions
What is the time difference between JST and MST?+
MST (UTC-06:00) is currently 15 hours behind JST (UTC+09:00). This page recalculates the offset live from the IANA time-zone database, including any daylight-saving transitions.
Does JST or MST observe daylight saving time?+
Denver observes daylight saving time; Tokyo does not, so the gap changes when Denver springs forward or falls back. Times on this page always reflect the current local rules.
What are the best meeting hours between Tokyo and Denver?+
Standard 9–5 working hours in Tokyo and Denver do not overlap. Pick an early or late slot for one side, or use the 24-hour table above to find a time that works.
How do I quickly convert JST to MST?+
Use the live clocks and 24-hour reference table above. Pick any hour on the JST row to see the matching MST time. The Event Planner also lets you pick a specific date and share it with attendees.