Time Difference Between Arizona Time and Mountain Time
As of 31 August 2026, Mountain Time is 1 hour ahead of Arizona Time. That number is not constant. Over the course of a year, because of daylight saving changes, Mountain Time, United States ranges from level with it to 1 hour ahead relative to Arizona Time, United States. The calculator below is always up to date.
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Arizona Time, United States
15:34
Mon, Aug 31, 2026
UTC-7 · MST · America/Phoenix
Mountain Time, United States
+1h16:34
Mon, Aug 31, 2026
UTC-6 · MDT · America/Denver
Mountain Time is 1 hour ahead of Arizona Time.
Time zone details
| Place | Local date | Time zone | UTC offset | Summer time |
|---|---|---|---|---|
| Arizona Time | Monday, August 31, 2026 | MSTAmerica/Phoenix | UTC-7 | Not observed |
| Mountain Time | Monday, August 31, 2026 | MDTAmerica/Denver | UTC-6 | Active now |
Arizona Time: Most of Arizona does not observe daylight saving time, so it stays at UTC-7 all year — the same clock as Mountain Standard Time in winter, but 1 hour behind Mountain Time in summer. The Navajo Nation in Arizona is the exception and does observe it.
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.
Hour by hour: Arizona Time to Mountain Time
Every hour of today in Arizona Time and what it is in Mountain Time. Highlighted rows fall inside Mountain Time working hours (09:00–18:00).
| Arizona Time | Mountain Time |
|---|---|
| 00:00 | 01:00 |
| 01:00 | 02:00 |
| 02:00 | 03:00 |
| 03:00 | 04:00 |
| 04:00 | 05:00 |
| 05:00 | 06:00 |
| 06:00 | 07:00 |
| 07:00 | 08:00 |
| 08:00 | 09:00 |
| 09:00 | 10:00 |
| 10:00 | 11:00 |
| 11:00 | 12:00 |
| Arizona Time | Mountain Time |
|---|---|
| 12:00 | 13:00 |
| 13:00 | 14:00 |
| 14:00 | 15:00 |
| 15:00 | 16:00 |
| 16:00 | 17:00 |
| 17:00 | 18:00 |
| 18:00 | 19:00 |
| 19:00 | 20:00 |
| 20:00 | 21:00 |
| 21:00 | 22:00 |
| 22:00 | 23:00 |
| 23:00 | 00:00next day |
Best time to call or meet
Overlapping working hours
09:00–17:00 in Arizona Time (10:00–18:00 in Mountain Time)
Both places are inside 09:00–18:00 for 8 hours a day. Anything in this window works without asking anyone to stay late.
Reasonable calling hours
08:00–20:00 in Arizona Time (09:00–21:00 in Mountain 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, Mountain Time is on the same time as Arizona Time — instead of 1 hour ahead, 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.
Arizona Time and Mountain Time: common questions
What is the time difference between Arizona Time and Mountain Time?
As of 31 August 2026, Mountain Time is 1 hour ahead of Arizona Time. The gap is not fixed: across the year, Mountain Time ranges from level with it to 1 hour ahead relative to Arizona Time, as clocks change. The calculator on this page always shows the difference for right now.
When it is 9:00 AM in Arizona Time, what time is it in Mountain Time?
It is 10:00 AM in Mountain Time, United States. Use the time field in the calculator above to check any other hour.
Is Mountain Time ahead of or behind Arizona Time?
Mountain Time is ahead of Arizona Time by 1 hour at the moment. In practical terms, the working day in Mountain Time starts and ends earlier in Arizona Time terms.
Do Arizona Time and Mountain Time observe daylight saving time?
Mountain Time changes its clocks twice a year; Arizona Time does not. The difference therefore shifts by an hour when Mountain Time switches: across the year, Mountain Time ranges from level with it to 1 hour ahead relative to Arizona Time.
What is the best time to call Mountain Time from Arizona Time?
Working hours overlap between 09:00 and 17:00 Arizona Time time, which is 10:00 to 18:00 in Mountain Time. Calls inside that window reach both sides during the normal working day.
Related comparisons
Local dates shown for Arizona Time, United States (UTC-7) and Mountain Time, United States (UTC-6) were generated on Monday, August 31, 2026 UTC and refresh in your browser.