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DateAlmanac

What is MST in ACST?

Australian Central Time is 17 hours 30 minutes ahead

Mountain Time is on UTC−7:00 and Australian Central Time is on UTC+10:30 right now. Australian Central Time is on daylight saving, so its clocks read ACDT. The gap changes during the year — see below.

Convert a time

ACDT — Australian Central Time

6:30 pm

ACDT, Sat

Time in Denver
1:29:20 AM
Time in Adelaide
6:59:20 PM
Difference
+17:30 h
Next clock change
March 14, 2027

When the difference changes

Mountain Time and Australian Central 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, 2027Australian Central Time is 17 hours 30 minutes ahead
  2. March 14, 2027 – April 3, 2027Australian Central Time is 16 hours 30 minutes ahead
  3. April 3, 2027 – October 2, 2027Australian Central Time is 15 hours 30 minutes ahead
  4. October 2, 2027 – November 7, 2027Australian Central Time is 16 hours 30 minutes ahead
  5. November 7, 2027 – onwardsAustralian Central Time is 17 hours 30 minutes ahead

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

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.

Australian Central Time

Sunday, April 4, 2027

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

MST to ACST conversion table

Every hour of Saturday, November 7, 2026, converted from Mountain Time to Australian Central Time. 17 of the 24 hours fall on a different calendar day in Adelaide, which is marked.

12:00 am MST
5:30 pm ACDT
1:00 am MST
6:30 pm ACDT
2:00 am MST
7:30 pm ACDT
3:00 am MST
8:30 pm ACDT
4:00 am MST
9:30 pm ACDT
5:00 am MST
10:30 pm ACDT
6:00 am MST
11:30 pm ACDT
7:00 am MST
12:30 am ACDT+1 day
8:00 am MST
1:30 am ACDT+1 day
9:00 am MST
2:30 am ACDT+1 day
10:00 am MST
3:30 am ACDT+1 day
11:00 am MST
4:30 am ACDT+1 day
12:00 pm MST
5:30 am ACDT+1 day
1:00 pm MST
6:30 am ACDT+1 day
2:00 pm MST
7:30 am ACDT+1 day
3:00 pm MST
8:30 am ACDT+1 day
4:00 pm MST
9:30 am ACDT+1 day
5:00 pm MST
10:30 am ACDT+1 day
6:00 pm MST
11:30 am ACDT+1 day
7:00 pm MST
12:30 pm ACDT+1 day
8:00 pm MST
1:30 pm ACDT+1 day
9:00 pm MST
2:30 pm ACDT+1 day
10:00 pm MST
3:30 pm ACDT+1 day
11:00 pm MST
4:30 pm ACDT+1 day

Scheduling between the two

Working hours overlap from 4:00 pm to 6:00 pm MST, which is 9:30 am to 11:30 am ACDT. Anything inside that window falls in the normal working day at both ends.

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

Australian Central Time (ACDT) is used in South Australia and the Northern Territory, on a half-hour offset from the east coast

Other conversions