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MT to AET time converter
Sydney is 16 hours ahead of US Mountain for 182 days of 2026, and 18 hours ahead of for the other 127 days, because daylight saving changes the gap.
MT to AET conversion table
Local time in US Mountain and the matching time in Sydney on two reference dates, one in winter and one in summer for the northern hemisphere.
| US Mountain (MT) | Sydney on 15 January | Sydney on 15 July |
|---|---|---|
| 08:00 | 02:00 (+1 day) | 00:00 (+1 day) |
| 09:00 | 03:00 (+1 day) | 01:00 (+1 day) |
| 10:00 | 04:00 (+1 day) | 02:00 (+1 day) |
| 12:00 | 06:00 (+1 day) | 04:00 (+1 day) |
| 15:00 | 09:00 (+1 day) | 07:00 (+1 day) |
| 17:00 | 11:00 (+1 day) | 09:00 (+1 day) |
| 18:00 | 12:00 (+1 day) | 10:00 (+1 day) |
| 21:00 | 15:00 (+1 day) | 13:00 (+1 day) |
Best meeting times between US Mountain and Sydney
- January: Inside both working days (09:00-17:00): 15:00-17:00 MT = 09:00-11:00 AET (+1 day).
- July: No overlap inside both working days. The closest flexible hours (07:00-21:00): 15:00-21:00 MT = 07:00-13:00 AET (+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 MT and AET
- US Mountain moves its clocks forward on 8 March and back on 1 November in 2026.
- Sydney moves its clocks back on 5 April and forward on 4 October in 2026.
- The gap is 16 hours for 182 days and 18 hours for 127 days of 2026.
About the two zones
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.
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.
Frequently asked questions
What time is 9 AM MT in AET?
On 15 January, 09:00 in US Mountain is 03:00 (+1 day) in Sydney. On 15 July it is 01:00 (+1 day).
What is the time difference between US Mountain and Sydney?
Sydney is 16 hours ahead of US Mountain for 182 days of 2026, and 18 hours ahead of for the other 127 days, because daylight saving changes the gap.
Does the time difference between MT and AET 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 US Mountain and Sydney?
Inside both working days (09:00-17:00): 15:00-17:00 MT = 09:00-11:00 AET (+1 day). In July: No overlap inside both working days. The closest flexible hours (07:00-21:00): 15:00-21:00 MT = 07:00-13:00 AET (+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.