Highlighted rows fall within 09:00–18:00 in both places: 2 shared working hours.
How many hours is MST behind AEST?
As abbreviations, AEST is always 17 hours ahead of MST: MST is UTC−7 and AEST is UTC+10. To convert, add 17 hours.
When the MST to AEST time difference changes
For most of the year AEST is 16 hours ahead of MST. From 1 November to 31 December 2026, AEST is 17 hours ahead of MST instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
Dates
AEST vs MST
Length
1 November 2026 to 31 December 2026
17 hours ahead
61 days
1 January 2027 to 13 March 2027
17 hours ahead
72 days
14 March 2027 to 6 November 2027
16 hours ahead
238 days
7 November 2027 to 31 December 2027
17 hours ahead
55 days
Calling hours for MST and AEST
When AEST is 16 hours ahead of MST: no shared 09:00 to 17:00 hours; try 17:00 in MST (09:00 in AEST).
When AEST is 17 hours ahead of MST: no shared 09:00 to 17:00 hours; one side has to take the call outside office hours.
Frequently asked questions about MST and AEST time
How many hours ahead is AEST of MST?
AEST (UTC+10) is 17 hours ahead of MST (UTC−7).
Does the time difference between MST and AEST change?
Yes. It is usually 16 hours ahead, but changes when one side moves its clocks: 17 hours ahead from 1 November to 31 December 2026; 17 hours ahead from 1 January to 13 March 2027.