AEST to London
-9hAEST
AESTSOURCELondon
BSTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and BST on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and BST (Greenwich Mean Time) timezone regions across the globe.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •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.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •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.
About London
WikipediaLondon, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.
AEST to London Time Difference – Complete Guide
AEST runs on Australian Eastern Standard Time (AEST) at UTC+10:00. London runs on British Summer Time (BST) at UTC+01:00, also currently on daylight saving time. That puts AEST 9 hours behind London — a difference of -9h at the current offsets.
In practice, when it is 9:00 AM in AEST it is 12:00 AM in London. Midnight in AEST is 3:00 PM in London.London observes daylight saving time while AEST does not, so the gap narrows or widens by an hour part of the year.
AEST to London time conversion table
| AEST (AEST) | London (BST) | Day |
|---|---|---|
| 12:00 AM | 3:00 PM | previous day |
| 6:00 AM | 9:00 PM | previous day |
| 7:00 AM | 10:00 PM | previous day |
| 8:00 AM | 11:00 PM | previous day |
| 9:00 AM | 12:00 AM | same day |
| 12:00 PM | 3:00 AM | same day |
| 3:00 PM | 6:00 AM | same day |
| 5:00 PM | 8:00 AM | same day |
| 6:00 PM | 9:00 AM | same day |
| 9:00 PM | 12:00 PM | same day |
Why people convert AEST to London time
- Scheduling a call from AEST to London: a 10:00 AM start in AEST lands at 1:00 AM in London, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -9h gap: AEST and London 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 London is 12:00 AM in AEST.
- Coordinating a AEST-based team with London contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEST" is unambiguous; "3 PM" across a -9h gap is not.
- With a -9h gap there is no shared 9-to-5 window, so alternate the early start: one week AEST takes the early slot, the next week London does.
- London: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
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 London
With a -9h offset there is no overlap inside a normal 9 AM – 5 PM day. London opens at 9:00 AM BST, which is 12:00 AM in AEST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AEST and London have no shared working hours because of the -9h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AEST is 9 hours behind London (AEST UTC+10:00 → BST UTC+01:00). 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
London
☀ 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:
Frequently Asked Questions
What is the time difference between AEST and London?
AEST (AEST, UTC+10:00) is 9 hours behind London (BST, UTC+01:00). The gap is currently -9h.
How do I convert AEST time to London time?
Add -9h to AEST local time. For example, 9:00 AM in AEST is 12:00 AM in London.
What time is it in London right now?
London uses BST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -9h offset from AEST.
What is the best time to call London from AEST?
There is no shared working-hours window because of the -9h gap. The closest option is 1:00 PM in AEST, which is 4:00 AM in London.
Which is behind, AEST or London?
AEST is 9 hours behind London. When it is 12:00 PM in AEST it is 3:00 AM in London.
Do AEST and London use different time zones?
AEST uses AEST at UTC+10:00, while London (UK) uses BST at UTC+01:00. The IANA identifiers are Australia/Sydney and Europe/London.
Does daylight saving time affect the AEST–London difference?
Yes at the moment: London is on daylight saving time and AEST is not, so the -9h gap shifts by an hour when exactly one of them changes clocks.
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 London?
Not normally. The -9h gap only pushes the date over the previous day.
What is the time difference between AEST and London?
London is -9h from AEST.
What timezone is AEST in?
AEST operates on its local timezone.
What timezone is London in?
London, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
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.
When is it midnight in AEST, what time is it in London?
When it is 12:00 AM (midnight) in AEST (AEST), it is -9h later in London (GMT).
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