Sydney to MDT
-16hSydney
AESTSOURCEMDT
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 Daylight 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.
MDT – Mountain Daylight Time
UTC-06:00Mountain Daylight Time (MDT) is the daylight saving offset in the Mountain Time Zone, 6 hours behind UTC.
- •MDT shares the same offset as CST (UTC-06:00).
- •Arizona does not switch to MDT, remaining on MST.
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.
Comparing Time Zones: Sydney and MDT
Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. That puts Sydney 16 hours behind MDT — a difference of -16h at the current offsets.
In practice, when it is 9:00 AM in Sydney it is 5:00 PM in MDT on the previous day. Midnight in Sydney is 8:00 AM in MDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sydney to MDT time conversion table
| Sydney (AEST) | MDT (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 MDT time
- Scheduling a call from Sydney to MDT: a 10:00 AM start in Sydney lands at 6:00 PM in MDT the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -16h gap: Sydney and MDT 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 MDT is 5:00 PM in Sydney.
- Coordinating a Sydney-based team with MDT contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- 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 MDT 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.
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 MDT (Mountain Daylight Time)
Mountain Daylight Time (MDT) is observed during summer months in the Mountain Time Zone, except in Arizona which stays on MST year-round. MDT aligns with Central Standard Time (CST) at UTC-06:00.
Best time to call between Sydney and MDT
With a -16h offset there is no overlap inside a normal 9 AM – 5 PM day. MDT 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 MDT 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 MDT (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
MDT
☀ 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 MDT?
Sydney (AEST, UTC+10:00) is 16 hours behind MDT (MDT, UTC-06:00). The gap is currently -16h.
How do I convert Sydney time to MDT time?
Add -16h to Sydney local time. For example, 9:00 AM in Sydney is 5:00 PM in MDT (previous day).
What time is it in MDT right now?
MDT 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 MDT 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 MDT.
Which is behind, Sydney or MDT?
Sydney is 16 hours behind MDT. When it is 12:00 PM in Sydney it is 8:00 PM in MDT.
Do Sydney and MDT use different time zones?
Sydney (Australia) uses AEST at UTC+10:00, while MDT uses MDT at UTC-06:00. The IANA identifiers are Australia/Sydney and America/Denver.
Does daylight saving time affect the Sydney–MDT difference?
Neither zone observes daylight saving time, so the -16h offset between Sydney and MDT 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 MDT?
Sometimes. The -16h gap is large enough that 8:00 PM or later in Sydney already falls on the in MDT.
What is the time difference between Sydney and MDT?
MDT 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 MDT in?
MDT 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 MDT timezone?
Major cities in the MDT timezone include Denver, Calgary, Edmonton, Salt Lake City, Boise.
What is the UTC offset for MDT?
Mountain Daylight Time (MDT) is at UTC-06:00. During daylight saving time, it shifts to MST.
What should I know about the MDT timezone?
MDT shares the same offset as CST (UTC-06:00). Arizona does not switch to MDT, remaining on MST.
When is it midnight in Sydney, what time is it in MDT?
When it is 12:00 AM (midnight) in Sydney (AEST), it is -16h later in MDT (MDT).
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