AEST to MST Converter & Meeting Planner
Quick answer: 9:00 AM AEST = 4:00 PM MST (fixed +10:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Australian Eastern Standard Time (AEST) and Mountain Standard Time (MST)? You need to account for the standard time difference. Mountain Standard Time is normally 17 hours behind Australian Eastern Standard Time. Whether you are coordinating between teams in Sydney and Melbourne and Denver and Phoenix, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM AEST = 7:00 AM MST. The full 24-hour AEST to MST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM AEST = 10:00 PM MST (-1 day).
| AEST Time | MST Time |
|---|---|
| 12:00 AM (00:00) | 7:00 AM (07:00)-1 day |
| 1:00 AM (01:00) | 8:00 AM (08:00)-1 day |
| 2:00 AM (02:00) | 9:00 AM (09:00)-1 day |
| 3:00 AM (03:00) | 10:00 AM (10:00)-1 day |
| 4:00 AM (04:00) | 11:00 AM (11:00)-1 day |
| 5:00 AM (05:00) | 12:00 PM (12:00)-1 day |
| 6:00 AM (06:00) | 1:00 PM (13:00)-1 day |
| 7:00 AM (07:00) | 2:00 PM (14:00)-1 day |
| 8:00 AM (08:00) | 3:00 PM (15:00)-1 day |
| 9:00 AM (09:00) | 4:00 PM (16:00)-1 day |
| 10:00 AM (10:00) | 5:00 PM (17:00)-1 day |
| 11:00 AM (11:00) | 6:00 PM (18:00)-1 day |
| 12:00 PM (12:00) | 7:00 PM (19:00)-1 day |
| 1:00 PM (13:00) | 8:00 PM (20:00)-1 day |
| 2:00 PM (14:00) | 9:00 PM (21:00)-1 day |
| 3:00 PM (15:00) | 10:00 PM (22:00)-1 day |
| 4:00 PM (16:00) | 11:00 PM (23:00)-1 day |
| 5:00 PM (17:00) | 12:00 AM (00:00) |
| 6:00 PM (18:00) | 1:00 AM (01:00) |
| 7:00 PM (19:00) | 2:00 AM (02:00) |
| 8:00 PM (20:00) | 3:00 AM (03:00) |
| 9:00 PM (21:00) | 4:00 AM (04:00) |
| 10:00 PM (22:00) | 5:00 AM (05:00) |
| 11:00 PM (23:00) | 6:00 AM (06:00) |
Best time to call Denver from Sydney
For most work calls, compare the normal business day in Sydney (AEST) with the business day in Denver (MST). AEST commonly covers Oceania, Australia, while MST is mainly associated with North America.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 1:00 AM AEST, which reaches 9:00 AM MST near the start of their workday.
- DST Safety: AEST or MST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Australian Securities Exchange (ASX): 10:00-16:00 local time in Sydney.
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Frequently Asked Questions
What is the time difference between AEST and MST?
During standard time, Mountain Standard Time is 17 hours behind Australian Eastern Standard Time.
Does all of eastern Australia observe Daylight Saving Time?
No — eastern Australia is split on DST. New South Wales (Sydney), Victoria (Melbourne), Tasmania (Hobart), and the ACT (Canberra) advance their clocks to AEDT (UTC+11) each October, while Queensland (Brisbane) opts out entirely and remains on AEST (UTC+10) year-round. This means Sydney and Brisbane run on the same clock for only part of the year.
What is the difference between AEST and AEDT?
AEST (Australian Eastern Standard Time) is the UTC+10:00 offset observed during the Southern Hemisphere winter months, roughly April through October. AEDT (Australian Eastern Daylight Time) is the UTC+11:00 offset applied during the Southern Hemisphere summer when clocks spring forward in October, observed by New South Wales, Victoria, Tasmania, and the ACT.
Does Arizona observe Daylight Saving Time?
Most of Arizona — including Phoenix, Tucson, and the state government — does not observe Daylight Saving Time, remaining on MST (UTC-7) year-round under a state law in effect since 1968. The significant exception is the Navajo Nation, which spans parts of northeastern Arizona, Utah, and New Mexico and does observe DST, creating one of the most complex intrastate time zone situations in the United States.
What is the difference between MST and MDT?
MST (Mountain Standard Time) is the winter offset at UTC-7:00, observed from the first Sunday in November through the second Sunday in March. MDT (Mountain Daylight Time) is the summer offset at UTC-6:00, applied when most Mountain Time regions advance their clocks by one hour during Daylight Saving Time.