Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

AEST to GMT

-10h

AEST

AESTSOURCE

UTC+10:00DST observed

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

GMT

UTC+01:00☀ DST active

HH02

MM00

02:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

AEST

GMT

12:00 AM

3:00 PM-1

2:00 AM

5:00 PM-1

4:00 AM

7:00 PM-1

6:00 AM

9:00 PM-1

8:00 AM

11:00 PM-1

10:00 AM

1:00 AM

12:00 PM

3:00 AM

2:00 PM

5:00 AM

4:00 PM

7:00 AM

6:00 PM

9:00 AM

8:00 PM

11:00 AM

10:00 PM

1:00 PM

Green rows indicate typical business hours (9 AM - 5 PM)

AEST and GMT on the World Map

The map below highlights the AEST (Australian Eastern Standard Time) and GMT (Greenwich Mean Time) timezone regions across the globe.

AEST Zone

→

GMT Zone

Explore all world timezones interactively →

AEST – Australian Eastern Standard Time

UTC+10:00

Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.

Countries in AEST

Australia (NSW, VIC, QLD, TAS, ACT)Papua New Guinea

Major Cities in AEST

SydneyMelbourneBrisbaneCanberraHobartGold Coast

Key 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.
•The Australian Securities Exchange (ASX) operates on AEST/AEDT.
•AEST is 15 hours ahead of EST during winter.

Daylight Saving:Yes – switches to AEDT

Learn more about AEST on Wikipedia

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key Facts about GMT

•GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
•The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
•GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
•Iceland uses GMT year-round and never observes daylight saving time.
•The UK switches from GMT to BST (British Summer Time) in late March each year.

Daylight Saving:Yes – switches to BST

Learn more about GMT on Wikipedia

Everything You Need to Know About AEST and GMT Time

AEST runs on Australian Eastern Standard Time (AEST) at UTC+10:00. GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. That puts AEST 10 hours behind GMT — a difference of -10h at the current offsets.

In practice, when it is 9:00 AM in AEST it is 11:00 PM in GMT on the previous day. Midnight in AEST is 2:00 PM in GMT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

AEST to GMT time conversion table

AEST (AEST)	GMT (GMT)	Day
12:00 AM	2:00 PM	previous day
6:00 AM	8:00 PM	previous day
7:00 AM	9:00 PM	previous day
8:00 AM	10:00 PM	previous day
9:00 AM	11:00 PM	previous day
12:00 PM	2:00 AM	same day
3:00 PM	5:00 AM	same day
5:00 PM	7:00 AM	same day
6:00 PM	8:00 AM	same day
9:00 PM	11:00 AM	same day

Why people convert AEST to GMT time

Scheduling a call from AEST to GMT: a 10:00 AM start in AEST lands at 12:00 AM in GMT, so you can confirm the slot without doing the arithmetic yourself.
Handling a -10h gap: AEST and GMT 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 GMT is 11:00 PM in AEST.
Keeping family and friends in sync: knowing that 8:00 PM in AEST is 10:00 AM in GMT makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM AEST" is unambiguous; "3 PM" across a -10h gap is not.
With a -10h gap there is no shared 9-to-5 window, so alternate the early start: one week AEST takes the early slot, the next week GMT does.

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 GMT (Greenwich Mean Time)

Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.

Best time to call between AEST and GMT

With a -10h offset there is no overlap inside a normal 9 AM – 5 PM day. GMT opens at 9:00 AM GMT, which is 11:00 PM in AEST, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

AEST and GMT have no shared working hours because of the -10h gap. Teams need to alternate early starts or rely on asynchronous handovers.

AEST is 10 hours behind GMT (AEST UTC+10:00 → GMT UTC+00:00). 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

AEST

❄ Currently in Standard Time

Standard: UTC+10:00 · DST: UTC+11:00

Clocks spring forward on Sat, Oct 3, 2026

GMT

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between AEST and GMT?

AEST (AEST, UTC+10:00) is 10 hours behind GMT (GMT, UTC+00:00). The gap is currently -10h.

How do I convert AEST time to GMT time?

Add -10h to AEST local time. For example, 9:00 AM in AEST is 11:00 PM in GMT (previous day).

What time is it in GMT right now?

GMT uses GMT at UTC+00:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -10h offset from AEST.

What is the best time to call GMT from AEST?

There is no shared working-hours window because of the -10h gap. The closest option is 1:00 PM in AEST, which is 3:00 AM in GMT.

Which is behind, AEST or GMT?

AEST is 10 hours behind GMT. When it is 12:00 PM in AEST it is 2:00 AM in GMT.

Does daylight saving time affect the AEST–GMT difference?

Neither zone observes daylight saving time, so the -10h offset between AEST and GMT is fixed all year.

Which other cities share AEST's time zone?

AEST also covers Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.

Which countries use AEST, AEST's zone?

AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.

Is there a day difference between AEST and GMT?

Not normally. The -10h gap only pushes the date over the previous day.

What is the time difference between AEST and GMT?

GMT is -10h from AEST.

What timezone is AEST in?

AEST operates on its local timezone.

What timezone is GMT in?

GMT operates on its local timezone.

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 GMT timezone?

Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.

What is the UTC offset for GMT?

Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.

What should I know about the GMT timezone?

GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.