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AET to MT time converter
US Mountain is 16 hours behind Sydney for 182 days of 2026, and 18 hours behind for the other 127 days, because daylight saving changes the gap.
AET to MT conversion table
Local time in Sydney and the matching time in US Mountain on two reference dates, one in winter and one in summer for the northern hemisphere.
| Sydney (AET) | US Mountain on 15 January | US Mountain on 15 July |
|---|---|---|
| 08:00 | 14:00 (-1 day) | 16:00 (-1 day) |
| 09:00 | 15:00 (-1 day) | 17:00 (-1 day) |
| 10:00 | 16:00 (-1 day) | 18:00 (-1 day) |
| 12:00 | 18:00 (-1 day) | 20:00 (-1 day) |
| 15:00 | 21:00 (-1 day) | 23:00 (-1 day) |
| 17:00 | 23:00 (-1 day) | 01:00 |
| 18:00 | 00:00 | 02:00 |
| 21:00 | 03:00 | 05:00 |
Best meeting times between Sydney and US Mountain
- January: Inside both working days (09:00-17:00): 09:00-11:00 AET = 15:00-17:00 MT (-1 day).
- July: No overlap inside both working days. The closest flexible hours (07:00-21:00): 07:00-13:00 AET = 15:00-21:00 MT (-1 day).
Want to add more people? The meeting planner starts with these two zones and lets you add up to four more.
Daylight saving between AET and MT
- Sydney moves its clocks back on 5 April and forward on 4 October in 2026.
- US Mountain moves its clocks forward on 8 March and back on 1 November in 2026.
- The gap is 16 hours for 182 days and 18 hours for 127 days of 2026.
About the two zones
Sydney. Sydney is on AEST (UTC+10) in winter and AEDT (UTC+11) in summer. Because it is in the southern hemisphere, its summer time runs from October to April, the opposite of Europe and North America.
US Mountain. US Mountain Time is UTC-7 in winter (MST) and UTC-6 in summer (MDT). Arizona is the notable exception and stays on MST all year.
Frequently asked questions
What time is 9 AM AET in MT?
On 15 January, 09:00 in Sydney is 15:00 (-1 day) in US Mountain. On 15 July it is 17:00 (-1 day).
What is the time difference between Sydney and US Mountain?
US Mountain is 16 hours behind Sydney for 182 days of 2026, and 18 hours behind for the other 127 days, because daylight saving changes the gap.
Does the time difference between AET and MT change during the year?
Yes. Both zones change their clocks, on different dates, so the gap moves between 16 and 18 hours. Always convert with the actual date.
When is the best time for a meeting between Sydney and US Mountain?
Inside both working days (09:00-17:00): 09:00-11:00 AET = 15:00-17:00 MT (-1 day). In July: No overlap inside both working days. The closest flexible hours (07:00-21:00): 07:00-13:00 AET = 15:00-21:00 MT (-1 day).
More conversions
Need the time in a scheduler? Convert a local-time cron schedule to UTC, or see which jobs a clock change affects with the DST collision simulator.