AEST to MT Time Converter
MT is 17 hours behind AEST. Eastern Australia is currently on AEDT (UTC+11:00), and The US Mountain states are currently on MDT (UTC-6:00).
Best Time to Call Between AEST and MT
Both zones are inside normal business hours between 9:00 AM and 10:00 AM AEST — that's 4:00 PM to 5:00 PM MT. That's a 1-hour window.
both at work AEST only MT only neither — hours along the strip are AEST.
Common Times Converted
AEST on the left, MT on the right.
AEST to MT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| AEST | MT | Working hours |
|---|---|---|
| 12:00 AM | 7:00 AM prev day | — |
| 1:00 AM | 8:00 AM prev day | — |
| 2:00 AM | 9:00 AM prev day | MT only |
| 3:00 AM | 10:00 AM prev day | MT only |
| 4:00 AM | 11:00 AM prev day | MT only |
| 5:00 AM | 12:00 PM prev day | MT only |
| 6:00 AM | 1:00 PM prev day | MT only |
| 7:00 AM | 2:00 PM prev day | MT only |
| 8:00 AM | 3:00 PM prev day | MT only |
| 9:00 AM | 4:00 PM prev day | Both zones |
| 10:00 AM | 5:00 PM prev day | AEST only |
| 11:00 AM | 6:00 PM prev day | AEST only |
| 12:00 PM | 7:00 PM prev day | AEST only |
| 1:00 PM | 8:00 PM prev day | AEST only |
| 2:00 PM | 9:00 PM prev day | AEST only |
| 3:00 PM | 10:00 PM prev day | AEST only |
| 4:00 PM | 11:00 PM prev day | AEST only |
| 5:00 PM | 12:00 AM | — |
| 6:00 PM | 1:00 AM | — |
| 7:00 PM | 2:00 AM | — |
| 8:00 PM | 3:00 AM | — |
| 9:00 PM | 4:00 AM | — |
| 10:00 PM | 5:00 AM | — |
| 11:00 PM | 6:00 AM | — |
What AEST and MT Actually Are
AEST — Australian Eastern Standard Time
Sydney, Melbourne, Brisbane, Canberra, Hobart. Standing at UTC+10:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, April 4, 2027, to AEST. Sydney and Melbourne move to AEDT (UTC+11) for the southern summer; Brisbane does not change at all.
Queensland abandoned daylight saving after a 1992 referendum, so for five months a year Brisbane and Sydney read different clocks despite sharing a zone.
MT — Mountain Time
Denver, Salt Lake City, Calgary, Edmonton — and Phoenix, which does not change its clocks. Standing at UTC-7:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to MST.
Mountain Time contains the most conspicuous daylight saving exception in North America: Arizona, which has opted out since 1968.
What This Means in Practice
The date changes mid-working-day
For 8 of the eight hours in a normal AEST working day, the equivalent MT time falls on a different calendar date. Anything scheduled in that stretch needs the date checked as well as the time, or a Tuesday call quietly becomes a Wednesday one at the other end.
Both sides change clocks, on different dates
Both regions observe daylight saving but do not switch on the same day, so for a week or two each spring and fall the gap between them is an hour different from the rest of the year. Those short windows are where recurring invitations quietly break.
Nearly opposite sides of the clock
At 17 hours apart, one side's morning is the other side's night. Handing work over at the end of a shift usually beats trying to get both parties in the same call.
Major Cities in Each Zone
Cities on AEST
Cities on MT
Frequently Asked Questions
What is the time difference between AEST and MT?
MT is 17 hours behind AEST.
What is 9:00 AM AEST in MT?
9:00 AM AEST is 4:00 PM the previous day MT.
What are the best hours to schedule a call between AEST and MT?
Between 9:00 AM and 10:00 AM AEST, which is 4:00 PM to 5:00 PM MT. Both sides are inside normal business hours through that window.
Does the difference between AEST and MT change during the year?
Yes. Both regions observe daylight saving, and they do not switch on the same dates, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, April 4, 2027.
Does AEST always mean Australian Eastern Standard Time?
Sydney and Melbourne move to AEDT (UTC+11) for the southern summer; Brisbane does not change at all.