Sydney to Denver
-16hSydney
AESTSOURCEDenver
MDTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and MDT on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and MDT (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.
About Denver
WikipediaDenver operates on Mountain Time (MST/MDT), 2 hours behind New York. As a tech and aerospace hub, Denver bridges West Coast and Central US business hours.
Denver International Airport is the largest airport in North America by land area.
Time Conversion Guide: Sydney to Denver
Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. Denver runs on Mountain Daylight Time (MDT) at UTC-06:00, also currently on daylight saving time. That puts Sydney 16 hours behind Denver — a difference of -16h at the current offsets.
In practice, when it is 9:00 AM in Sydney it is 5:00 PM in Denver on the previous day. Midnight in Sydney is 8:00 AM in Denver.Denver observes daylight saving time while Sydney does not, so the gap narrows or widens by an hour part of the year.
Sydney to Denver time conversion table
| Sydney (AEST) | Denver (MDT) | Day |
|---|---|---|
| 12:00 AM | 8:00 AM | previous day |
| 6:00 AM | 2:00 PM | previous day |
| 7:00 AM | 3:00 PM | previous day |
| 8:00 AM | 4:00 PM | previous day |
| 9:00 AM | 5:00 PM | previous day |
| 12:00 PM | 8:00 PM | previous day |
| 3:00 PM | 11:00 PM | previous day |
| 5:00 PM | 1:00 AM | same day |
| 6:00 PM | 2:00 AM | same day |
| 9:00 PM | 5:00 AM | same day |
Why people convert Sydney to Denver time
- Scheduling a call from Sydney to Denver: a 10:00 AM start in Sydney lands at 6:00 PM in Denver the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -16h gap: Sydney and Denver 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 Denver is 5:00 PM in Sydney.
- Booking travel or deliveries: tracking Denver local time against Sydney keeps pickup windows and arrival estimates honest across the -16h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEST" is unambiguous; "3 PM" across a -16h gap is not.
- With a -16h gap there is no shared 9-to-5 window, so alternate the early start: one week Sydney takes the early slot, the next week Denver 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 -16h gap.
- Denver: Clocks fall back on Sun, Nov 1, 2026. Any meeting series spanning that date will shift by an hour in local time.
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 Denver
With a -16h offset there is no overlap inside a normal 9 AM – 5 PM day. Denver opens at 9:00 AM MDT, which is 5:00 PM in Sydney, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Sydney and Denver have no shared working hours because of the -16h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Sydney is 16 hours behind Denver (AEST UTC+10:00 → MDT UTC-06:00). 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
Denver
☀ 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 Denver?
Sydney (AEST, UTC+10:00) is 16 hours behind Denver (MDT, UTC-06:00). The gap is currently -16h.
How do I convert Sydney time to Denver time?
Add -16h to Sydney local time. For example, 9:00 AM in Sydney is 5:00 PM in Denver (previous day).
What time is it in Denver right now?
Denver uses MDT at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -16h offset from Sydney.
What is the best time to call Denver from Sydney?
There is no shared working-hours window because of the -16h gap. The closest option is 1:00 PM in Sydney, which is 9:00 PM in Denver.
Which is behind, Sydney or Denver?
Sydney is 16 hours behind Denver. When it is 12:00 PM in Sydney it is 8:00 PM in Denver.
Do Sydney and Denver use different time zones?
Sydney (Australia) uses AEST at UTC+10:00, while Denver (USA) uses MDT at UTC-06:00. The IANA identifiers are Australia/Sydney and America/Denver.
Does daylight saving time affect the Sydney–Denver difference?
Yes at the moment: Denver is on daylight saving time and Sydney is not, so the -16h gap shifts by an hour when exactly one of them changes clocks.
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 Denver?
Sometimes. The -16h gap is large enough that 8:00 PM or later in Sydney already falls on the in Denver.
What is the time difference between Sydney and Denver?
Denver is -16h 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 Denver in?
Denver operates on Mountain Time (MST/MDT), 2 hours behind New York. As a tech and aerospace hub, Denver bridges West Coast and Central US business hours.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
What are the business hours in Denver?
Standard business hours in Denver are 8:00 AM - 5:00 PM MST.
What is the best time to schedule a call between Sydney and Denver?
The best overlap for a call is when both cities are in business hours. Sydney works 9:00 AM - 5:00 PM AEST and Denver works 8:00 AM - 5:00 PM MST (-16h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Sydney and Denver?
Sydney uses AUD (A$) while Denver uses USD ($). Check current exchange rates when planning travel or business between these cities.
How do Sydney and Denver compare in size?
Sydney has a population of approximately 5.4 million (metro: 5.4 million), while Denver has approximately 715,000 (metro: 2.9 million).
What are the major landmarks in Sydney and Denver?
Sydney is known for Sydney Opera House, Sydney Harbour Bridge, Bondi Beach. Denver is famous for Red Rocks Amphitheatre, Denver Art Museum, Union Station.
Do Sydney and Denver have stock exchanges?
Yes. Sydney has the ASX (Australian Securities Exchange) and Denver has the N/A (Uses NYSE/NASDAQ). The -16h time difference affects trading hour overlaps between these exchanges.
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 Denver?
When it is 12:00 AM (midnight) in Sydney (AEST), it is -16h later in Denver (MST).
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