AEDT to MDT
-17hAEDT
AEDTSOURCEMDT
MDTGreen rows indicate typical business hours (9 AM - 5 PM)
AEDT and MDT on the World Map
The map below highlights the AEDT (Australian Eastern Daylight Time) and MDT (Mountain Daylight Time) timezone regions across the globe.
AEDT – Australian Eastern Daylight Time
UTC+11:00Australian Eastern Daylight Time (AEDT, UTC+11:00) is the daylight saving period in south-eastern Australia, from October to April.
- •AEDT runs from the first Sunday in October to the first Sunday in April.
- •AEDT is one hour ahead of Australian Eastern Standard Time (AEST).
- •Queensland does not observe daylight saving, so Brisbane stays on AEST.
- •During AEDT, Sydney is 16 hours ahead of New York and 11 hours ahead of UTC.
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.
AEDT to MDT Time Difference – Complete Guide
AEDT runs on Australian Eastern Daylight Time (AEDT) at UTC+11:00. MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. That puts AEDT 17 hours behind MDT — a difference of -17h at the current offsets.
In practice, when it is 9:00 AM in AEDT it is 4:00 PM in MDT on the previous day. Midnight in AEDT is 7:00 AM in MDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AEDT to MDT time conversion table
| AEDT (AEDT) | MDT (MDT) | 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 AEDT to MDT time
- Scheduling a call from AEDT to MDT: a 10:00 AM start in AEDT lands at 5:00 PM in MDT the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -17h gap: AEDT 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 4:00 PM in AEDT.
- Watching a live event or market open: AEDT viewers need 4:00 PM in MDT to catch a 9:00 AM start there, and 5:00 PM if the event is anchored to AEDT.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEDT" 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 AEDT takes the early slot, the next week MDT does.
About AEDT (Australian Eastern Daylight Time)
Australian Eastern Daylight Time (AEDT) is the daylight saving period in south-eastern Australia, one hour ahead of Australian Eastern Standard Time (AEST, UTC+10:00). Because Australia is in the southern hemisphere, AEDT runs through the summer — from the first Sunday in October to the first Sunday in April — which is almost exactly the reverse of the European and North American schedules. New South Wales, Victoria, Tasmania and the Australian Capital Territory observe it; Queensland and the Northern Territory do not, so Brisbane stays on AEST year round while Sydney moves to AEDT. During AEDT, Sydney is 11 hours ahead of UTC and 16 hours ahead of New York.
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 AEDT and MDT
With a -17h offset there is no overlap inside a normal 9 AM – 5 PM day. MDT opens at 9:00 AM MDT, which is 4:00 PM in AEDT, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AEDT and MDT have no shared working hours because of the -17h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AEDT is 17 hours behind MDT (AEDT UTC+11:00 → 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
AEDT
❄ 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 AEDT and MDT?
AEDT (AEDT, UTC+11:00) is 17 hours behind MDT (MDT, UTC-06:00). The gap is currently -17h.
How do I convert AEDT time to MDT time?
Add -17h to AEDT local time. For example, 9:00 AM in AEDT is 4:00 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 -17h offset from AEDT.
What is the best time to call MDT from AEDT?
There is no shared working-hours window because of the -17h gap. The closest option is 1:00 PM in AEDT, which is 8:00 PM in MDT.
Which is behind, AEDT or MDT?
AEDT is 17 hours behind MDT. When it is 12:00 PM in AEDT it is 7:00 PM in MDT.
Does daylight saving time affect the AEDT–MDT difference?
Neither zone observes daylight saving time, so the -17h offset between AEDT and MDT is fixed all year.
Which other cities share AEDT's time zone?
AEDT also covers Sydney, Melbourne, Canberra, Hobart, Newcastle.
Which countries use AEDT, AEDT's zone?
AEDT is used in Australia (NSW, Victoria, Tasmania, ACT).
Is there a day difference between AEDT and MDT?
Sometimes. The -17h gap is large enough that 8:00 PM or later in AEDT already falls on the in MDT.
What is the time difference between AEDT and MDT?
MDT is -17h from AEDT.
What timezone is AEDT in?
AEDT operates on its local timezone.
What timezone is MDT in?
MDT operates on its local timezone.
Which countries use AEDT (Australian Eastern Daylight Time)?
AEDT is used in Australia (NSW, Victoria, Tasmania, ACT).
Does AEDT observe daylight saving time?
Yes, AEDT switches to AEDT during summer months.
What are some interesting facts about AEDT?
AEDT runs from the first Sunday in October to the first Sunday in April. AEDT is one hour ahead of Australian Eastern Standard Time (AEST).
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 AEDT, what time is it in MDT?
When it is 12:00 AM (midnight) in AEDT (AEDT), it is -17h later in MDT (MDT).
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- new york to aedt
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- los angeles to aedt
- paris to aedt
- delhi to aedt
- mumbai to aedt
- berlin to aedt
- hong kong to aedt
- toronto to aedt
- kathmandu to aedt
See every conversion from AEDT →·See every conversion from MDT →