9am in Australian Eastern Standard Time is 5pm in Mountain Daylight Time on the previous day.

Frequently asked

Quick answers about converting between Australian Eastern Standard Time and Mountain Daylight Time. Can't find what you need? Email [email protected].

What is the time difference between Australian Eastern Standard Time and Mountain Daylight Time?

Australian Eastern Standard Time is 16 hours ahead of Mountain Daylight Time right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.

When it's 9am in Australian Eastern Standard Time, what time is it in Mountain Daylight Time?

9am in Australian Eastern Standard Time is 5pm in Mountain Daylight Time on the previous day. That's already evening in Mountain Daylight Time, after the typical working day ends. Use the hour-by-hour table above to read any other time across.

What's the best time for a call between Australian Eastern Standard Time and Mountain Daylight Time?

There's no comfortable 9-to-5 overlap between Australian Eastern Standard Time and Mountain Daylight Time — they sit on opposite sides of the planet's working day. Plan for an early or late call on one side, or hand work off asynchronously.

Does this account for daylight saving time?

Yes. We track every clock change in both places, so the abbreviations you see — AEST and MDT — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.

Why is the date sometimes different on each side?

When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.