Time Difference Between Mountain Time and Hawaii Time
As of 31 August 2026, Hawaii Time is 4 hours behind Mountain Time. That number is not constant. Over the course of a year, because of daylight saving changes, Hawaii Time, United States ranges from 4 hours behind to 3 hours behind relative to Mountain Time, United States. The calculator below is always up to date.
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Mountain Time, United States
16:34
Mon, Aug 31, 2026
UTC-6 · MDT · America/Denver
Hawaii Time, United States
-4h12:34
Mon, Aug 31, 2026
UTC-10 · HST · Pacific/Honolulu
Hawaii Time is 4 hours behind Mountain Time.
Time zone details
| Place | Local date | Time zone | UTC offset | Summer time |
|---|---|---|---|---|
| Mountain Time | Monday, August 31, 2026 | MDTAmerica/Denver | UTC-6 | Active now |
| Hawaii Time | Monday, August 31, 2026 | HSTPacific/Honolulu | UTC-10 | Not observed |
Mountain Time: Covers Denver and most of the Rocky Mountain states. Switches between MST (UTC-7) and MDT (UTC-6) with daylight saving — unlike Arizona, which stays on MST year-round.
Hawaii Time: Covers Hawaii. Stays at UTC-10 all year — Hawaii does not observe daylight saving time.
Hour by hour: Mountain Time to Hawaii Time
Every hour of today in Mountain Time and what it is in Hawaii Time. Highlighted rows fall inside Hawaii Time working hours (09:00–18:00).
| Mountain Time | Hawaii Time |
|---|---|
| 00:00 | 20:00prev day |
| 01:00 | 21:00prev day |
| 02:00 | 22:00prev day |
| 03:00 | 23:00prev day |
| 04:00 | 00:00 |
| 05:00 | 01:00 |
| 06:00 | 02:00 |
| 07:00 | 03:00 |
| 08:00 | 04:00 |
| 09:00 | 05:00 |
| 10:00 | 06:00 |
| 11:00 | 07:00 |
| Mountain Time | Hawaii Time |
|---|---|
| 12:00 | 08:00 |
| 13:00 | 09:00 |
| 14:00 | 10:00 |
| 15:00 | 11:00 |
| 16:00 | 12:00 |
| 17:00 | 13:00 |
| 18:00 | 14:00 |
| 19:00 | 15:00 |
| 20:00 | 16:00 |
| 21:00 | 17:00 |
| 22:00 | 18:00 |
| 23:00 | 19:00 |
Best time to call or meet
Overlapping working hours
13:00–18:00 in Mountain Time (09:00–14:00 in Hawaii Time)
Both places are inside 09:00–18:00 for 5 hours a day. Anything in this window works without asking anyone to stay late.
Reasonable calling hours
12:00–21:00 in Mountain Time (08:00–17:00 in Hawaii Time)
Both people are awake and available between 08:00 and 21:00 local time during this window.
When this difference changes
Mountain Time puts its clocks back on Sunday, November 1, 2026
The local offset moves from UTC-6 to UTC-7. After that date, Hawaii Time is 3 hours behind Mountain Time — instead of 4 hours behind, as it is today.
Planning something with more than two places?
Adding a third city usually kills the obvious answer. The Meeting Time Finder takes up to five cities at once and shows only the hours that work for everybody.
Mountain Time and Hawaii Time: common questions
What is the time difference between Mountain Time and Hawaii Time?
As of 31 August 2026, Hawaii Time is 4 hours behind Mountain Time. The gap is not fixed: across the year, Hawaii Time ranges from 4 hours behind to 3 hours behind relative to Mountain Time, as clocks change. The calculator on this page always shows the difference for right now.
When it is 9:00 AM in Mountain Time, what time is it in Hawaii Time?
It is 05:00 AM in Hawaii Time, United States. Use the time field in the calculator above to check any other hour.
Is Hawaii Time ahead of or behind Mountain Time?
Hawaii Time is behind Mountain Time by 4 hours at the moment. In practical terms, the working day in Hawaii Time starts and ends later in Mountain Time terms.
Do Mountain Time and Hawaii Time observe daylight saving time?
Mountain Time changes its clocks twice a year; Hawaii Time does not. The difference therefore shifts by an hour when Mountain Time switches: across the year, Hawaii Time ranges from 4 hours behind to 3 hours behind relative to Mountain Time.
What is the best time to call Hawaii Time from Mountain Time?
Working hours overlap between 13:00 and 18:00 Mountain Time time, which is 09:00 to 14:00 in Hawaii Time. Calls inside that window reach both sides during the normal working day.
Related comparisons
Local dates shown for Mountain Time, United States (UTC-6) and Hawaii Time, United States (UTC-10) were generated on Monday, August 31, 2026 UTC and refresh in your browser.