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ACST to MST Time Converter

MST is 17 hours 30 minutes behind ACST right now. 9:00 AM in ACST is 3:30 PM in MST (the day before).

Time now: ACST and MST

🌐 Australian Central Time10:28 AMTuesday, November 10 · UTC+10:30
🌐 Mountain Time (US & Canada)4:58 PMMonday, November 9 · UTC-07:00

MST is 17 hours 30 minutes behind ACST right now. The gap is not fixed: it is 17 hours 30 minutes at some times of the year and 15 hours 30 minutes at others, because at least one of them changes its clocks for daylight saving time.

ACST to MST conversion table

Every hour of the day, using today's time difference.

ACSTMST
12:00 AM6:30 AMprevious day
1:00 AM7:30 AMprevious day
2:00 AM8:30 AMprevious day
3:00 AM9:30 AMprevious day
4:00 AM10:30 AMprevious day
5:00 AM11:30 AMprevious day
6:00 AM12:30 PMprevious day
7:00 AM1:30 PMprevious day
8:00 AM2:30 PMprevious day
9:00 AM3:30 PMprevious day
10:00 AM4:30 PMprevious day
11:00 AM5:30 PMprevious day
12:00 PM6:30 PMprevious day
1:00 PM7:30 PMprevious day
2:00 PM8:30 PMprevious day
3:00 PM9:30 PMprevious day
4:00 PM10:30 PMprevious day
5:00 PM11:30 PMprevious day
6:00 PM12:30 AM
7:00 PM1:30 AM
8:00 PM2:30 AM
9:00 PM3:30 AM
10:00 PM4:30 AM
11:00 PM5:30 AM

Best time to meet between ACST and MST

Working hours overlap (9 AM – 6 PM in both places):

  • 9:00 AM – 12:00 PM ACST = 3:30 PM – 6:30 PM MST

The time difference changes during the year because of daylight saving time, so these windows shift by an hour at other times.

Does the time difference between ACST and MST change?

Yes. Right now MST is 17 hours 30 minutes behind ACST. These are the dates in the next 12 months when the gap changes:

  • Sunday, 14 March 2027: MST moves its clocks forward. MST is 16 hours 30 minutes behind ACST from then (it was 17 hours 30 minutes before).
  • Sunday, 4 April 2027: ACST moves its clocks back. MST is 15 hours 30 minutes behind ACST from then (it was 16 hours 30 minutes before).
  • Sunday, 3 October 2027: ACST moves its clocks forward. MST is 16 hours 30 minutes behind ACST from then (it was 15 hours 30 minutes before).
  • Sunday, 7 November 2027: MST moves its clocks back. MST is 17 hours 30 minutes behind ACST from then (it was 16 hours 30 minutes before).

Office hours in each other's time

  • 9 AM to 6 PM in ACST is 3:30 PM (previous day) to 12:30 AM in MST.
  • 9 AM to 6 PM in MST is 2:30 AM (next day) to 11:30 AM (next day) in ACST.

Based on today's clock settings.

Frequently asked questions

What is the time difference between ACST and MST?

MST is 17 hours 30 minutes behind ACST right now. The gap is not fixed: it is 17 hours 30 minutes at some times of the year and 15 hours 30 minutes at others, because at least one of them changes its clocks for daylight saving time.

How do I convert ACST to MST?

Subtract 17 hours 30 minutes from the ACST time to get the MST time (at today's difference). 9:00 AM in ACST is 3:30 PM in MST (the day before). Or use the converter above and pick any date and time.

What is the current time in MST?

It is 4:58 PM in MST on Monday, November 9 (the converter above shows it live). At the same moment it is 10:28 AM in ACST.

Does the time difference between ACST and MST change during the year?

Yes. Right now MST is 17 hours 30 minutes behind ACST. Over the next 12 months the gap changes 4 times: Sunday, 14 March 2027: MST moves its clocks forward. MST is 16 hours 30 minutes behind ACST from then (it was 17 hours 30 minutes before). Sunday, 4 April 2027: ACST moves its clocks back. MST is 15 hours 30 minutes behind ACST from then (it was 16 hours 30 minutes before). Sunday, 3 October 2027: ACST moves its clocks forward. MST is 16 hours 30 minutes behind ACST from then (it was 15 hours 30 minutes before). Sunday, 7 November 2027: MST moves its clocks back. MST is 17 hours 30 minutes behind ACST from then (it was 16 hours 30 minutes before).

What is the best time for a meeting between ACST and MST?

Between 9 AM and 6 PM in both places you can meet at 9:00 AM – 12:00 PM ACST = 3:30 PM – 6:30 PM MST. Check the overlap section on this page for every option.

What does MST mean?

Mountain Time is MST (UTC-07:00) in winter and MDT (UTC-06:00) in summer. Arizona stays on MST all year.

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