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DateAlmanac

What is AEST in MST?

Mountain Time is 18 hours behind

Australian Eastern Time is on UTC+11:00 and Mountain Time is on UTC−7:00 right now. Australian Eastern Time is on daylight saving, so its clocks read AEDT. The gap changes during the year — see below.

Convert a time

MST — Mountain Time

1:00 am

MST, Sat

Time in Sydney
7:29:37 PM
Time in Denver
1:29:37 AM
Difference
−18 h
Next clock change
March 14, 2027

When the difference changes

Australian Eastern Time and Mountain Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:

  1. Now – March 14, 2027Mountain Time is 18 hours behind
  2. March 14, 2027 – April 4, 2027Mountain Time is 17 hours behind
  3. April 4, 2027 – October 3, 2027Mountain Time is 16 hours behind
  4. October 3, 2027 – November 7, 2027Mountain Time is 17 hours behind
  5. November 7, 2027 – onwardsMountain Time is 18 hours behind

Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.

Daylight saving

Australian Eastern Time

Sunday, April 4, 2027

Clocks go back one hour — 3:00 am becomes 2:00 am local time, and the zone is on AEST after that.

Mountain Time

Sunday, March 14, 2027

Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on MDT after that.

AEST to MST conversion table

Every hour of Saturday, November 7, 2026, converted from Australian Eastern Time to Mountain Time. 18 of the 24 hours fall on a different calendar day in Denver, which is marked.

12:00 am AEDT
6:00 am MST−1 day
1:00 am AEDT
7:00 am MST−1 day
2:00 am AEDT
8:00 am MST−1 day
3:00 am AEDT
9:00 am MST−1 day
4:00 am AEDT
10:00 am MST−1 day
5:00 am AEDT
11:00 am MST−1 day
6:00 am AEDT
12:00 pm MST−1 day
7:00 am AEDT
1:00 pm MST−1 day
8:00 am AEDT
2:00 pm MST−1 day
9:00 am AEDT
3:00 pm MST−1 day
10:00 am AEDT
4:00 pm MST−1 day
11:00 am AEDT
5:00 pm MST−1 day
12:00 pm AEDT
6:00 pm MST−1 day
1:00 pm AEDT
7:00 pm MST−1 day
2:00 pm AEDT
8:00 pm MST−1 day
3:00 pm AEDT
9:00 pm MST−1 day
4:00 pm AEDT
10:00 pm MST−1 day
5:00 pm AEDT
11:00 pm MST−1 day
6:00 pm AEDT
12:00 am MST
7:00 pm AEDT
1:00 am MST
8:00 pm AEDT
2:00 am MST
9:00 pm AEDT
3:00 am MST
10:00 pm AEDT
4:00 am MST
11:00 pm AEDT
5:00 am MST

Scheduling between the two

Working hours overlap from 9:00 am to 12:00 pm AEDT, which is 3:00 pm to 6:00 pm MST. Anything inside that window falls in the normal working day at both ends.

Australian Eastern Time (AEDT) is used in Melbourne, Canberra and Brisbane. Queensland stays on AEST all year while the southern states move to AEDT.

Mountain Time (MST) is used in Salt Lake City, Albuquerque and Calgary. Arizona keeps MST all year and does not follow MDT.

Other conversions