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MST to JST converter
Mountain Time
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Japan Standard Time
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Japan Standard Time is 15 hours ahead of Mountain Time for most of the year, and 16 hours ahead of for part of it, because the two change their clocks on different dates (or only one of them changes at all).
When does the difference change?
In 2026:
- January 1 to March 7: Japan Standard Time is 16 hours ahead of Mountain Time
- March 8 to October 31: Japan Standard Time is 15 hours ahead of Mountain Time
- November 1 to December 31: Japan Standard Time is 16 hours ahead of Mountain Time
Questions
What time is 9 AM MST in JST?
For most of the year, 9 AM Mountain Time is 12 AM the next day Japan Standard Time. For part of the year it is 1 AM the next day, because of daylight saving time.
How many hours ahead or behind is JST from MST?
Japan Standard Time is 15 hours ahead of Mountain Time for most of the year, and 16 hours ahead of for part of it, because the two change their clocks on different dates (or only one of them changes at all).
Does the MST to JST difference change?
Yes. It changes 2 times in 2026 because of daylight saving time.
About these time zones
MST to JST, hour by hour
| Mountain Time | Japan Standard Time |
|---|---|
| 12 AM | 3 PM |
| 1 AM | 4 PM |
| 2 AM | 5 PM |
| 3 AM | 6 PM |
| 4 AM | 7 PM |
| 5 AM | 8 PM |
| 6 AM | 9 PM |
| 7 AM | 10 PM |
| 8 AM | 11 PM |
| 9 AM | 12 AM (next day) |
| 10 AM | 1 AM (next day) |
| 11 AM | 2 AM (next day) |
| 12 PM | 3 AM (next day) |
| 1 PM | 4 AM (next day) |
| 2 PM | 5 AM (next day) |
| 3 PM | 6 AM (next day) |
| 4 PM | 7 AM (next day) |
| 5 PM | 8 AM (next day) |
| 6 PM | 9 AM (next day) |
| 7 PM | 10 AM (next day) |
| 8 PM | 11 AM (next day) |
| 9 PM | 12 PM (next day) |
| 10 PM | 1 PM (next day) |
| 11 PM | 2 PM (next day) |
Based on the clocks on Monday, October 12, 2026. Use the converter above for another date.