Sydney to MST
-17hSydney
AESTSOURCEMST
MSTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and MST on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and MST (Mountain Standard Time) timezone regions across the globe.
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.
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.
About Sydney
WikipediaSydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
Sydney is one of the first major cities to welcome the New Year.
Sydney vs MST: Offsets, DST and Best Call Times
Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. MST runs on Mountain Standard Time (MST) at UTC-07:00. That puts Sydney 17 hours behind MST — a difference of -17h at the current offsets.
In practice, when it is 9:00 AM in Sydney it is 4:00 PM in MST on the previous day. Midnight in Sydney is 7:00 AM in MST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sydney to MST time conversion table
| Sydney (AEST) | MST (MST) | Day |
|---|---|---|
| 12:00 AM | 7:00 AM | previous day |
| 6:00 AM | 1:00 PM | previous day |
| 7:00 AM | 2:00 PM | previous day |
| 8:00 AM | 3:00 PM | previous day |
| 9:00 AM | 4:00 PM | previous day |
| 12:00 PM | 7:00 PM | previous day |
| 3:00 PM | 10:00 PM | previous day |
| 5:00 PM | 12:00 AM | same day |
| 6:00 PM | 1:00 AM | same day |
| 9:00 PM | 4:00 AM | same day |
Why people convert Sydney to MST time
- Scheduling a call from Sydney to MST: a 10:00 AM start in Sydney lands at 5:00 PM in MST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -17h gap: Sydney and MST 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 MST is 4:00 PM in Sydney.
- Booking travel or deliveries: tracking MST local time against Sydney keeps pickup windows and arrival estimates honest across the -17h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEST" 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 Sydney takes the early slot, the next week MST does.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Re-check this page after that date because the offset changes and so does the -17h gap.
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.
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).
Best time to call between Sydney and MST
With a -17h offset there is no overlap inside a normal 9 AM – 5 PM day. MST opens at 9:00 AM MST, which is 4:00 PM in Sydney, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Sydney and MST have no shared working hours because of the -17h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Sydney is 17 hours behind MST (AEST UTC+10:00 → MST UTC-07:00). 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
Sydney
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
MST
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 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 Sydney and MST?
Sydney (AEST, UTC+10:00) is 17 hours behind MST (MST, UTC-07:00). The gap is currently -17h.
How do I convert Sydney time to MST time?
Add -17h to Sydney local time. For example, 9:00 AM in Sydney is 4:00 PM in MST (previous day).
What time is it in MST right now?
MST uses MST at UTC-07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -17h offset from Sydney.
What is the best time to call MST from Sydney?
There is no shared working-hours window because of the -17h gap. The closest option is 1:00 PM in Sydney, which is 8:00 PM in MST.
Which is behind, Sydney or MST?
Sydney is 17 hours behind MST. When it is 12:00 PM in Sydney it is 7:00 PM in MST.
Do Sydney and MST use different time zones?
Sydney (Australia) uses AEST at UTC+10:00, while MST uses MST at UTC-07:00. The IANA identifiers are Australia/Sydney and America/Denver.
Does daylight saving time affect the Sydney–MST difference?
Neither zone observes daylight saving time, so the -17h offset between Sydney and MST is fixed all year.
Which other cities share Sydney's time zone?
AEST also covers Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
Which countries use AEST, Sydney's zone?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Is there a day difference between Sydney and MST?
Sometimes. The -17h gap is large enough that 8:00 PM or later in Sydney already falls on the in MST.
What is the time difference between Sydney and MST?
MST is -17h from Sydney.
What timezone is Sydney in?
Sydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
What timezone is MST in?
MST operates on its local timezone.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
Which countries use AEST (Australian Eastern Standard Time)?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Does AEST observe daylight saving time?
Yes, AEST switches to AEDT during summer months.
What are some interesting facts about AEST?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
Which cities are in the MST timezone?
Major cities in the MST timezone include Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson.
What is the UTC offset for MST?
Mountain Standard Time (MST) is at UTC-07:00. During daylight saving time, it shifts to MDT.
What should I know about the MST timezone?
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.
When is it midnight in Sydney, what time is it in MST?
When it is 12:00 AM (midnight) in Sydney (AEST), it is -17h later in MST (MST).
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