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HST to MST converter
Hawaii Time
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Mountain Time
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Mountain Time is 4 hours ahead of Hawaii Time for most of the year, and 3 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: Mountain Time is 3 hours ahead of Hawaii Time
- March 8 to October 31: Mountain Time is 4 hours ahead of Hawaii Time
- November 1 to December 31: Mountain Time is 3 hours ahead of Hawaii Time
Questions
What time is 9 AM HST in MST?
For most of the year, 9 AM Hawaii Time is 1 PM Mountain Time. For part of the year it is 12 PM, because of daylight saving time.
How many hours ahead or behind is MST from HST?
Mountain Time is 4 hours ahead of Hawaii Time for most of the year, and 3 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 HST to MST difference change?
Yes. It changes 2 times in 2026 because of daylight saving time.
About these time zones
HST to MST, hour by hour
| Hawaii Time | Mountain Time |
|---|---|
| 12 AM | 4 AM |
| 1 AM | 5 AM |
| 2 AM | 6 AM |
| 3 AM | 7 AM |
| 4 AM | 8 AM |
| 5 AM | 9 AM |
| 6 AM | 10 AM |
| 7 AM | 11 AM |
| 8 AM | 12 PM |
| 9 AM | 1 PM |
| 10 AM | 2 PM |
| 11 AM | 3 PM |
| 12 PM | 4 PM |
| 1 PM | 5 PM |
| 2 PM | 6 PM |
| 3 PM | 7 PM |
| 4 PM | 8 PM |
| 5 PM | 9 PM |
| 6 PM | 10 PM |
| 7 PM | 11 PM |
| 8 PM | 12 AM (next day) |
| 9 PM | 1 AM (next day) |
| 10 PM | 2 AM (next day) |
| 11 PM | 3 AM (next day) |
Based on the clocks on Monday, October 12, 2026. Use the converter above for another date.