ACST to MST Converter
central Australia to US Mountain — a 16.5-hour gap with seasonal variation due to daylight saving. Coordination typically centers on trade, investment, and remote team management.
Time Zone Converter
Compare Times
| ACST | MST |
|---|---|
| 8:00 AM ACST | 3:30 PM MST |
| 9:00 AM ACST | 4:30 PM MST |
| 10:00 AM ACST | 5:30 PM MST |
| 11:00 AM ACST | 6:30 PM MST |
| 12:00 PM ACST | 7:30 PM MST |
| 1:00 PM ACST | 8:30 PM MST |
| 2:00 PM ACST | 9:30 PM MST |
| 3:00 PM ACST | 10:30 PM MST |
| 4:00 PM ACST | 11:30 PM MST |
| 5:00 PM ACST | 12:30 AM MST |
| 6:00 PM ACST | 1:30 AM MST |
| 7:00 PM ACST | 2:30 AM MST |
| 8:00 PM ACST | 3:30 AM MST |
Common Time Conversions
EST · New York →
CST · Chicago →
MST · Denver →
PST · Los Angeles →
AKST · Anchorage →
HST · Honolulu →
UTC · Universal →
GMT · London →
IST · New Delhi →
CET · Paris →
How Time Zone Conversion Works
Time zone conversion works by comparing the UTC offset of one location to another. Every city or region is measured relative to Coordinated Universal Time (UTC), which acts as the global reference point for civil time.
MST is 16 hours 30 minutes behind ACST (standard time).
Daylight Saving Time: ACST observes DST; MST does not. The offset between them shifts by 1 hour twice a year — in spring and autumn — when ACST changes its clocks.
Best Meeting Times: ACST & MST
ACST
20:00–21:00
Central Australia Time
MST
03:30–04:30
Mountain Time
Recommended time: 20:00 ACST / 03:30 MST
DST schedule for 2026
Current-year daylight saving start and end dates for the selected zones.
ACST · Central Australia Time
Standard offset +09:30
- Starts
- Oct 4, 2026 · 02:00 → 03:00
- first_sunday_of_october
- Ends
- Apr 5, 2026 · 03:00 → 02:00
- first_sunday_of_april
- Daylight time
- ACDT · +10:30
South Australia observes DST (ACDT, UTC+10:30); the Northern Territory remains on ACST year-round. SA has used the same Sunday transition dates as the eastern states since the 2008/09 DST season — older sources stating SA changes one week later are out of date.
MST · Mountain Time
Standard offset −07:00
- Starts
- Mar 8, 2026 · 02:00 → 03:00
- second_sunday_of_march
- Ends
- Nov 1, 2026 · 02:00 → 01:00
- first_sunday_of_november
- Daylight time
- MDT · −06:00
Most of Arizona stays on MST year-round (does not observe DST). The Navajo Nation within Arizona does observe DST.
Principal Cities
ACST — Central Australia Time
- AdelaideAustralia
- DarwinAustralia
- Alice SpringsAustralia
- PalmerstonAustralia
MST — Mountain Time
- PhoenixUnited States
- CalgaryCanada
- EdmontonCanada
- DenverUnited States