MST to AEST
+17hMST
MSTSOURCEAEST
AESTGreen rows indicate typical business hours (9 AM - 5 PM)
MST and AEST on the World Map
The map below highlights the MST (Mountain Standard Time) and AEST (Australian Eastern Standard Time) timezone regions across the globe.
MST – Mountain Standard Time
UTC-07:00Mountain Standard Time (MST) is the time zone for the Mountain region of North America, 7 hours behind UTC.
- •Arizona does not observe daylight saving time, staying on MST year-round.
- •The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
- •Denver, the 'Mile High City', is the largest city fully in MST.
- •MST covers 6 US states entirely and parts of several others.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •Queensland does not observe daylight saving time, staying on AEST year-round.
- •Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
- •The Australian Securities Exchange (ASX) operates on AEST/AEDT.
- •AEST is 15 hours ahead of EST during winter.
Everything You Need to Know About MST and AEST Time
MST runs on Mountain Standard Time (MST) at UTC-07:00. AEST runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts MST 17 hours ahead of AEST — a difference of +17h at the current offsets.
In practice, when it is 9:00 AM in MST it is 2:00 AM in AEST on the next day. Midnight in MST is 5:00 PM in AEST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
MST to AEST time conversion table
| MST (MST) | AEST (AEST) | Day |
|---|---|---|
| 12:00 AM | 5:00 PM | same day |
| 6:00 AM | 11:00 PM | same day |
| 7:00 AM | 12:00 AM | next day |
| 8:00 AM | 1:00 AM | next day |
| 9:00 AM | 2:00 AM | next day |
| 12:00 PM | 5:00 AM | next day |
| 3:00 PM | 8:00 AM | next day |
| 5:00 PM | 10:00 AM | next day |
| 6:00 PM | 11:00 AM | next day |
| 9:00 PM | 2:00 PM | next day |
Why people convert MST to AEST time
- Scheduling a call from MST to AEST: a 10:00 AM start in MST lands at 3:00 AM in AEST the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +17h gap: MST and AEST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in AEST is 2:00 AM in MST.
- Booking travel or deliveries: tracking AEST local time against MST keeps pickup windows and arrival estimates honest across the +17h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM MST" is unambiguous; "3 PM" across a +17h gap is not.
- With a +17h gap there is no shared 9-to-5 window, so alternate the early start: one week MST takes the early slot, the next week AEST does.
About MST (Mountain Standard Time)
Mountain Standard Time (MST) covers the Rocky Mountain region of the United States and Canada. Arizona is notable for not observing daylight saving time, staying on MST year-round (except the Navajo Nation). The time zone includes major cities like Denver, Phoenix, Calgary, and Salt Lake City. During summer, most areas switch to Mountain Daylight Time (MDT, UTC-06:00).
About AEST (Australian Eastern Standard Time)
Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.
Best time to call between MST and AEST
With a +17h offset there is no overlap inside a normal 9 AM – 5 PM day. AEST opens at 9:00 AM AEST, which is 2:00 AM in MST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
MST and AEST have no shared working hours because of the +17h gap. Teams need to alternate early starts or rely on asynchronous handovers.
MST is 17 hours ahead of AEST (MST UTC-07:00 → AEST UTC+10:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
MST
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 2026
AEST
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between MST and AEST?
MST (MST, UTC-07:00) is 17 hours ahead of AEST (AEST, UTC+10:00). The gap is currently +17h.
How do I convert MST time to AEST time?
Add +17h to MST local time. For example, 9:00 AM in MST is 2:00 AM in AEST (next day).
What time is it in AEST right now?
AEST uses AEST at UTC+10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +17h offset from MST.
What is the best time to call AEST from MST?
There is no shared working-hours window because of the +17h gap. The closest option is 1:00 PM in MST, which is 6:00 AM in AEST.
Which is ahead, MST or AEST?
MST is 17 hours ahead of AEST. When it is 12:00 PM in MST it is 5:00 AM in AEST.
Does daylight saving time affect the MST–AEST difference?
Neither zone observes daylight saving time, so the +17h offset between MST and AEST is fixed all year.
Which other cities share MST's time zone?
MST also covers Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson and 2 more.
Which countries use MST, MST's zone?
MST is used in United States (Mountain), Canada (Alberta), Mexico (Chihuahua, Sonora).
Is there a day difference between MST and AEST?
Sometimes. The +17h gap is large enough that 8:00 PM or later in MST already falls on the next day in AEST.
What is the time difference between MST and AEST?
AEST is +17h from MST.
What timezone is MST in?
MST operates on its local timezone.
What timezone is AEST in?
AEST operates on its local timezone.
Which countries use MST (Mountain Standard Time)?
MST is used in United States (Mountain), Canada (Alberta), Mexico (Chihuahua, Sonora).
Does MST observe daylight saving time?
Yes, MST switches to MDT during summer months.
What are some interesting facts about MST?
Arizona does not observe daylight saving time, staying on MST year-round. The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
Which cities are in the AEST timezone?
Major cities in the AEST timezone include Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
What is the UTC offset for AEST?
Australian Eastern Standard Time (AEST) is at UTC+10:00. During daylight saving time, it shifts to AEDT.
What should I know about the AEST timezone?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
When is it midnight in MST, what time is it in AEST?
When it is 12:00 AM (midnight) in MST (MST), it is +17h later in AEST (AEST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More MST time conversions
- mst to denver
- mst to mdt
- mst to new york
- mst to london
- mst to dubai
- mst to tokyo
- mst to singapore
- mst to sydney
- mst to los angeles
- mst to paris
- mst to delhi
- mst to mumbai
- mst to berlin
- mst to hong kong
- mst to toronto
- mst to kathmandu
- new york to mst
- london to mst
- dubai to mst
- tokyo to mst
- singapore to mst
- sydney to mst
- los angeles to mst
- paris to mst
- delhi to mst
- mumbai to mst
- berlin to mst
- hong kong to mst
- toronto to mst
- kathmandu to mst
See every conversion from MST →·See every conversion from AEST →