What is the time difference between MST and AEST?

Australian Eastern Standard Time (AEST) is 17 hours ahead of Mountain Standard Time (MST). MST uses a UTC offset of UTC-6, while AEST uses UTC+11. For example, when it's 9:00 AM in MST, it's 2:00 AM in AEST. Note that this difference may shift by one hour during daylight saving time transitions if the two zones change on different dates. Use the conversion table above to see the exact time for each hour of the day.

How do I convert MST to AEST?

To convert MST to AEST, add 17 hours to the MST time. For example, 9:00 AM MST is 2:00 AM AEST, and 5:00 PM MST is 10:00 AM AEST. Keep in mind that during daylight saving time transitions, the offset between these timezones may temporarily change by one hour. You can also use the interactive converter above for quick, accurate results.

What time is it in AEST when it's noon in MST?

When it's 12:00 PM (noon) in MST, it's 5:00 AM in AEST. This is because AEST is 17 hours ahead of MST. Similarly, when it's 6:00 PM in MST, it's 11:00 AM in AEST. During daylight saving time transitions, these times may shift by one hour, so always verify the current offset. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours ahead is AEST from MST?

AEST is 17 hours ahead of MST. This means when it's 9:00 AM in MST, it's 2:00 AM in AEST, and when it's midnight in MST, it's 5:00 PM in AEST. The exact difference can vary by one hour during daylight saving time transitions. The conversion table above provides a complete hour-by-hour mapping.

Is AEST ahead or behind MST?

AEST is ahead of MST by 17 hours. Clocks in AEST show a later time than MST, meaning the day starts earlier in AEST relative to MST. For example, when it's morning in MST, it's already afternoon or evening in AEST. This gap may change by one hour during DST transitions.

Does MST observe daylight saving time?

Yes, Mountain Standard Time observes daylight saving time. During DST, the abbreviation changes to MDT and clocks move forward by one hour, typically in spring. Clocks then fall back in autumn, returning to standard MST time. This means the UTC offset for MST shifts between two values depending on the season. Check our DST change calendar for exact transition dates that may affect your MST to AEST conversions.

Does AEST observe daylight saving time?

Yes, Australian Eastern Standard Time observes daylight saving time. During DST, the abbreviation changes to AEDT and clocks move forward by one hour, typically in spring. Clocks then fall back in autumn, returning to standard AEST time. This means the UTC offset for AEST shifts between two values depending on the season. Check our DST change calendar for exact transition dates that may affect your MST to AEST conversions.

What is the best time to call from MST to AEST?

The best time for a call between MST and AEST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in AEST during their work day, call between 4:00 PM and 12:00 AM your MST time. Avoid calling too early or late, as the 17 hours difference means your evening could be their late night. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

When does daylight saving time change in MST?

Daylight saving time transitions vary by year and region. Mountain Standard Time observes DST, which typically shifts clocks forward by one hour in spring ("spring forward") and back in fall ("fall back"). During these transition periods, the time difference between MST and AEST may temporarily change by one hour, which can cause confusion for scheduled meetings or calls. It's important to double-check your conversions around transition dates, especially if the two timezones switch on different dates. Check our DST change calendar for exact transition dates in the current year.

Do MST and AEST ever have the same time?

No, MST and AEST are always 17 hours apart and never display the same clock time simultaneously. Both timezones observe DST and typically transition around the same period, so the standard difference remains consistent throughout the year. The 17 hours offset is determined by their fixed positions relative to the Prime Meridian (UTC). You can always rely on this consistent difference when planning across these timezones.

MST to AEST Converter

Convert Mountain Standard Time to Australian Eastern Standard Time. See the hour-by-hour conversion table below.

Timezone Details

Mountain Standard Time

3:34 AM

Monday, October 19, 2026

MDT (UTC-06:00)

Australian Eastern Standard Time

8:34 PM

Monday, October 19, 2026

AEDT (UTC+11:00)

Difference: +17 hours

MDT DST: Yes (MDT)

AEDT DST: Yes (AEDT)

24-Hour Overview

MDT — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

AEDT — 24-hour overview

5p5p

8p8p

10p

11p11p

12a

2a2a

5a5a

8a8a

10a

11a11a

12p

2p2p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

AEST to MST GMT to AEST AEST to GMT IST to AEST AEST to IST MST to GMT GMT to MST EST to AEST AEST to EST

Cities in These Timezones

MST Cities

Denver

AEST Cities

Sydney Canberra

More Tools

Compare MST & AEST Plan a Meeting (MST & AEST)See on Map

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Mountain Standard Time on Wikipedia Australian Eastern Standard Time on Wikipedia IANA Time Zone Database