AEST to MST Converter
MST is 18 hours behind AEDT. 9:00 AM AEDT = 3:00 PM MST (previous day).
MST is 18 hours behind AEDT at the moment. To convert AEST to MST, subtract 18 hours from the AEST time: 9:00 AM AEDT = 3:00 PM MST (previous day).
AEST (Australian Eastern Time) is used in New South Wales, Victoria, Tasmania, ACT; Queensland (Brisbane) all year. MST (Mountain Time) is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year.
Queensland stays on AEST all year. Most of Arizona uses MST all year and does not switch to MDT. AEST (Australian Eastern Standard Time) is not in force right now: New South Wales is currently on AEDT. This page uses whichever name applies on the date you pick, so the numbers below say AEDT.
AEST to MST time conversion table
AEST to MST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| AEST | MST | Day |
|---|---|---|
| 12:00 AM AEDT | 6:00 AM MST | previous day |
| 1:00 AM AEDT | 7:00 AM MST | previous day |
| 2:00 AM AEDT | 8:00 AM MST | previous day |
| 3:00 AM AEDT | 9:00 AM MST | previous day |
| 4:00 AM AEDT | 10:00 AM MST | previous day |
| 5:00 AM AEDT | 11:00 AM MST | previous day |
| 6:00 AM AEDT | 12:00 PM MST | previous day |
| 7:00 AM AEDT | 1:00 PM MST | previous day |
| 8:00 AM AEDT | 2:00 PM MST | previous day |
| 9:00 AM AEDT | 3:00 PM MST | work hours |
| 10:00 AM AEDT | 4:00 PM MST | work hours |
| 11:00 AM AEDT | 5:00 PM MST | previous day |
| 12:00 PM AEDT | 6:00 PM MST | previous day |
| 1:00 PM AEDT | 7:00 PM MST | previous day |
| 2:00 PM AEDT | 8:00 PM MST | previous day |
| 3:00 PM AEDT | 9:00 PM MST | previous day |
| 4:00 PM AEDT | 10:00 PM MST | previous day |
| 5:00 PM AEDT | 11:00 PM MST | previous day |
| 6:00 PM AEDT | 12:00 AM MST | night |
| 7:00 PM AEDT | 1:00 AM MST | night |
| 8:00 PM AEDT | 2:00 AM MST | night |
| 9:00 PM AEDT | 3:00 AM MST | night |
| 10:00 PM AEDT | 4:00 AM MST | night |
| 11:00 PM AEDT | 5:00 AM MST | night |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert AEST to MST
Subtract 18 hours from the AEST time to get MST.
Example: 9:00 AM AEDT = 3:00 PM MST (previous day).
Across midnight: 1:00 AM AEDT = 7:00 AM MST (previous day). The date changes, so always check the day as well as the hour.
Time difference between AEST and MST
The time difference between AEST and MST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 1 Jan 2026 – 7 Mar 2026: MST is 18 hours behind of AEST.
- 8 Mar 2026 – 4 Apr 2026: MST is 17 hours behind of AEST.
- 5 Apr 2026 – 3 Oct 2026: MST is 16 hours behind of AEST.
- 4 Oct 2026 – 31 Oct 2026: MST is 17 hours behind of AEST.
- 1 Nov 2026 – 31 Dec 2026: MST is 18 hours behind of AEST.
AEST and MST during daylight saving time
- AEST next changes on 4 Apr 2027: clocks go back one hour at 02:59 local time, from AEDT (UTC+11) to AEST (UTC+10).
- MST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from MST (UTC−7) to MDT (UTC−6).
Best time for a meeting between AEST and MST
AEST and MST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM AEDT, which is 1:00 PM MST.
AEST to MST FAQ
What is the time difference between AEST and MST?
Right now MST is 18 hours behind AEDT. The gap changes 5 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM AEST in MST?
9:00 AM AEDT is 3:00 PM MST (previous day).
What is 12 PM (noon) AEST in MST?
12:00 PM AEDT is 6:00 PM MST (previous day).
Is MST ahead of or behind AEST?
MST is 18 hours behind AEDT, so it is earlier in MST than in AEST.
Does AEST change for daylight saving time?
Yes. AEST next changes on 4 Apr 2027, when clocks go back one hour from AEDT to AEST.
Does MST change for daylight saving time?
Yes. MST next changes on 14 Mar 2027, when clocks go forward one hour from MST to MDT.
What is the best time for a meeting between AEST and MST?
AEST and MST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM AEDT, which is 1:00 PM MST.
Is MT the same as MST?
MST is the winter (standard) name of Mountain Time (MT). From March to November the same clocks are called MDT. This converter always uses the one in force on the date you choose.
Related conversions
Convert MST to AEST
Convert AEST to other time zones
Convert other time zones to MST
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.