ACST/ACDT to MST/MDT time converter

MST/MDT is 15 hours 30 minutes behind ACST/ACDT. When it is 9:00 AM in ACST/ACDT, it is 5:30 PM (Fri, Oct 16) in MST/MDT.

ACST/ACDT ACST

Saturday, October 17, 2026

MST/MDT MDT

Friday, October 16, 2026

ACST/ACDT
Australian Central Standard Time
Sat, Oct 17
ACSTUTC+9:30
MST/MDT
Mountain Standard Time
Fri, Oct 16
MDTUTC-6-15h 30m
Finding your time zone…
Shared working hours (9:00–18:00)

ACST/ACDT to MST/MDT conversion table

Every hour of today in ACST/ACDT and the matching time in MST/MDT. Light rows are typical working hours (9:00–18:00).

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

Best time to call or meet

Working hours don't overlap fully. The closest fit is 7:00 AM – 1:30 PM in ACST/ACDT (3:30 PM – 10:00 PM in MST/MDT): working hours on one side, early or late on the other.

Daylight saving time and the difference

The difference changes during the year because ACST/ACDT and MST/MDT switch clocks on different dates:

  • Oct 17, 2026 – Nov 1, 2026: -15h 30m
  • Nov 1, 2026 – Mar 14, 2027: -16h 30m
  • Mar 14, 2027 – Oct 17, 2027: -15h 30m

More conversions

MST to ACSTACST to UTCACST to GMTACST to ESTACST to CSTACST to PSTACST to CETACST to MSKACST to GSTACST to PKTACST to ISTACST to SGTACST to PHT
UTC to MSTGMT to MSTEST to MSTCST to MSTPST to MSTCET to MSTMSK to MSTGST to MSTPKT to MSTIST to MSTSGT to MSTPHT to MST

Questions and answers

What is the time difference between ACST/ACDT and MST/MDT?

MST/MDT is 15 hours 30 minutes behind ACST/ACDT.

What time is it in MST/MDT when it is 9 AM in ACST/ACDT?

When it is 9:00 AM in ACST/ACDT, it is 5:30 PM (Fri, Oct 16) in MST/MDT.

When is the best time to call MST/MDT from ACST/ACDT?

Working hours don't overlap fully. The closest fit is 7:00 AM – 1:30 PM in ACST/ACDT (3:30 PM – 10:00 PM in MST/MDT): working hours on one side, early or late on the other.

Does the time difference between ACST/ACDT and MST/MDT change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.