What is the time difference between AEST and GMT?

Greenwich Mean Time (GMT) is 11 hours behind Australian Eastern Standard Time (AEST). AEST uses a UTC offset of UTC+11, while GMT uses UTC. For example, when it's 9:00 AM in AEST, it's 10:00 PM in GMT. 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 AEST to GMT?

To convert AEST to GMT, subtract 11 hours from the AEST time. For example, 9:00 AM AEST is 10:00 PM GMT, and 5:00 PM AEST is 6:00 AM GMT. 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 GMT when it's noon in AEST?

When it's 12:00 PM (noon) in AEST, it's 1:00 AM in GMT. This is because GMT is 11 hours behind AEST. Similarly, when it's 6:00 PM in AEST, it's 7:00 AM in GMT. 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 behind is GMT from AEST?

GMT is 11 hours behind AEST. This means when it's 9:00 AM in AEST, it's 10:00 PM in GMT, and when it's midnight in AEST, it's 1:00 PM in GMT. 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 GMT ahead or behind AEST?

GMT is behind AEST by 11 hours. Clocks in GMT show an earlier time than AEST, meaning the day starts later in GMT relative to AEST. For example, when it's noon in AEST, it's still 1:00 AM in GMT. This gap may change by one hour during DST transitions.

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 AEST to GMT conversions.

Does GMT observe daylight saving time?

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

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

The best time for a call between AEST and GMT is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in GMT during their work day, call between 8:00 PM and 4:00 AM your AEST time. Avoid calling too early or late, as the 11 hours difference means your evening could be their early morning. 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 AEST?

Daylight saving time transitions vary by year and region. Australian Eastern 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 AEST and GMT 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 AEST and GMT ever have the same time?

No, AEST and GMT are always 11 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 11 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.

AEST to GMT Converter

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

Upcoming DST Change

UK Time (BST) will fall back on October 25. Clocks will shift by 1 hour (BST → GMT).

View all DST changes

Timezone Details

Australian Eastern Standard Time

12:48 PM

Sunday, October 25, 2026

AEDT (UTC+11:00)

Greenwich Mean Time

1:48 AM

Sunday, October 25, 2026

GMT (UTC+00:00)

Difference: -11 hours

AEDT DST: Yes (AEDT)

GMT DST: Yes (BST)

24-Hour Overview

AEDT — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

GMT — 24-hour overview

2p2p

5p5p

8p8p

10p

11p11p

12a

1a1a

4a4a

7a7a

10a10a

11a

12p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

GMT to AEST EST to GMT GMT to EST PST to GMT GMT to PST GMT to IST IST to GMT GMT to CET CET to GMT

Cities in These Timezones

AEST Cities

Sydney Canberra

GMT Cities

London Manchester Edinburgh

More Tools

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

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Australian Eastern Standard Time on Wikipedia Greenwich Mean Time on Wikipedia IANA Time Zone Database