Offset
The time difference between Mountain Time and Perth is 14 hours.
Mountain Time (MDT) is behind Perth (AWST).
MDT: UTC-6
AWST: UTC+8
Mountain Time is currently observing daylight saving time; Perth is not.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Mountain Time and Perth don't overlap on the same weekday. Perth is 14 hours ahead of Mountain Time.
With some flexibility, there’s a workable window outside standard hours:
- 5 PM–8 PM in Mountain Time (7 AM–10 AM the next day in Perth) — suggest 6:00 PM Mountain Time (8:00 AM Perth).
This means an early start or late finish for one side, but it’s a reasonable slot for a one-off meeting.
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
United States
- New Year's DayThu, Jan 1
- Martin Luther King, Jr. DayMon, Jan 19
- Presidents DayMon, Feb 16
- Memorial DayMon, May 25
- Juneteenth National Independence DayFri, Jun 19
- Independence DayFri, Jul 3
- Labour DayMon, Sep 7
- Columbus DayMon, Oct 12
- Veterans DayWed, Nov 11
- Thanksgiving DayThu, Nov 26
- Christmas DayFri, Dec 25
Australia
- New Year's DayThu, Jan 1
- Australia DayMon, Jan 26
- Good FridayFri, Apr 3
- Easter MondayMon, Apr 6
- Christmas DayFri, Dec 25
- St. Stephen's DayMon, Dec 28
About these zones
Mountain Time is also known as MST, or MDT. To call United States, dial +1.
Perth uses Australian Western Time (AWST). To call Australia, dial +61.
Perth is approximately 10,100 miles west of Mountain Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| MST | Perth | Day |
|---|---|---|
| 12:00 am | 2:00 pm | Same day |
| 1:00 am | 3:00 pm | Same day |
| 2:00 am | 4:00 pm | Same day |
| 3:00 am | 5:00 pm | Same day |
| 4:00 am | 6:00 pm | Same day |
| 5:00 am | 7:00 pm | Same day |
| 6:00 am | 8:00 pm | Same day |
| 7:00 am | 9:00 pm | Same day |
| 8:00 am | 10:00 pm | Same day |
| 9:00 am | 11:00 pm | Same day |
| 10:00 am | 12:00 am | +1 day |
| 11:00 am | 1:00 am | +1 day |
| 12:00 pm | 2:00 am | +1 day |
| 1:00 pm | 3:00 am | +1 day |
| 2:00 pm | 4:00 am | +1 day |
| 3:00 pm | 5:00 am | +1 day |
| 4:00 pm | 6:00 am | +1 day |
| 5:00 pm | 7:00 am | +1 day |
| 6:00 pm | 8:00 am | +1 day |
| 7:00 pm | 9:00 am | +1 day |
| 8:00 pm | 10:00 am | +1 day |
| 9:00 pm | 11:00 am | +1 day |
| 10:00 pm | 12:00 pm | +1 day |
| 11:00 pm | 1:00 pm | +1 day |
Daylight saving time
Mountain Time observes daylight saving time; Perth does not. The offset between the two zones changes when Mountain Time transitions: on Sunday, November 1, 2026, clocks fall back from MDT to MST.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:33 AM
- Sunset
- 8:28 PM
- Day length
- 14h 56m
- Sunrise
- 7:14 AM
- Sunset
- 5:20 PM
- Day length
- 10h 6m
Cities in these zones
Cities in Mountain Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Mountain Time
- BJC
- DEN
- OGD
- SLC
Airports in Australian Western Time
- PER
Related conversions
Common conversions
- What is 9:00 am MST in Perth?
- 9:00 am MST is 11:00 pm Perth.
- What is 12:00 pm MST in Perth?
- 12:00 pm MST is 2:00 am Perth, the next day.
- What is 12:30 pm MST in Perth?
- 12:30 pm MST is 2:30 am Perth, the next day.
- What is 2:00 pm MST in Perth?
- 2:00 pm MST is 4:00 am Perth, the next day.
- What is 5:00 pm MST in Perth?
- 5:00 pm MST is 7:00 am Perth, the next day.
- What is 11:30 pm MST in Perth?
- 11:30 pm MST is 1:30 pm Perth, the next day.