Time Difference Between Australia and Mountain Time
As of 12 October 2026, Mountain Time is 17 hours behind Australia. That number is not constant. Over the course of a year, because of daylight saving changes, Mountain Time, United States ranges from 18 hours behind to 16 hours behind relative to Sydney, Australia. The calculator below is always up to date.
Comparing other zones inside the country? See all seven US time zones side by side.
Tap either box to search any country or city.
Sydney, Australia
23:45
Mon, Oct 12, 2026
UTC+11 · Australia/Sydney
Mountain Time, United States
-17h
06:45
Mon, Oct 12, 2026
UTC-6 · MDT · America/Denver
Mountain Time is 17 hours behind Australia.
Time zone details
| Place | Local date | Time zone | UTC offset | Summer time |
|---|---|---|---|---|
| Australia | Monday, October 12, 2026 | Australia/Sydney | UTC+11 | Active now |
| Mountain Time | Monday, October 12, 2026 | MDTAmerica/Denver | UTC-6 | Active now |
Australia: Australia has several time zones and only some states use daylight saving. This page uses Eastern Time (Sydney, Melbourne); Perth is 2 to 3 hours behind.
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: Australia to Mountain Time
Every hour of today in Australia and what it is in Mountain Time. Highlighted rows fall inside Mountain Time working hours (09:00–18:00).
| Australia | Mountain Time |
|---|---|
| 00:00 | 07:00prev day |
| 01:00 | 08:00prev day |
| 02:00 | 09:00prev day |
| 03:00 | 10:00prev day |
| 04:00 | 11:00prev day |
| 05:00 | 12:00prev day |
| 06:00 | 13:00prev day |
| 07:00 | 14:00prev day |
| 08:00 | 15:00prev day |
| 09:00 | 16:00prev day |
| 10:00 | 17:00prev day |
| 11:00 | 18:00prev day |
| Australia | Mountain Time |
|---|---|
| 12:00 | 19:00prev day |
| 13:00 | 20:00prev day |
| 14:00 | 21:00prev day |
| 15:00 | 22:00prev day |
| 16:00 | 23:00prev day |
| 17:00 | 00:00 |
| 18:00 | 01:00 |
| 19:00 | 02:00 |
| 20:00 | 03:00 |
| 21:00 | 04:00 |
| 22:00 | 05:00 |
| 23:00 | 06:00 |
Best time to call or meet
Overlapping working hours
09:00–11:00 in Australia (16:00–18:00 in Mountain Time)
Both places are inside 09:00–18:00 for 2 hours a day. Anything in this window works without asking anyone to stay late.
Reasonable calling hours
08:00–14:00 in Australia (15:00–21:00 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 18 hours behind Australia — instead of 17 hours behind, as it is today.
Australia puts its clocks back on Sunday, April 4, 2027
The local offset moves from UTC+11 to UTC+10. After that date, Mountain Time is 16 hours behind Australia — instead of 17 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.
Australia and Mountain Time: common questions
What is the time difference between Australia and Mountain Time?
As of 12 October 2026, Mountain Time is 17 hours behind Australia. The gap is not fixed: across the year, Mountain Time ranges from 18 hours behind to 16 hours behind relative to Australia, as clocks change. The calculator on this page always shows the difference for right now.
When it is 9:00 AM in Australia, what time is it in Mountain Time?
It is 04:00 PM 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 Australia?
Mountain Time is behind Australia by 17 hours at the moment. In practical terms, the working day in Mountain Time starts and ends later in Australia terms.
Do Australia and Mountain Time observe daylight saving time?
Both Australia and Mountain Time change their clocks, but not on the same dates. That is why the gap is not fixed: across the year, Mountain Time ranges from 18 hours behind to 16 hours behind relative to Australia.
What is the best time to call Mountain Time from Australia?
Working hours overlap between 09:00 and 11:00 Australia time, which is 16:00 to 18:00 in Mountain Time. Calls inside that window reach both sides during the normal working day.
Related comparisons
Local dates shown for Sydney, Australia (UTC+11) and Mountain Time, United States (UTC-6) were generated on Monday, October 12, 2026 UTC and refresh in your browser.