GMT to AEST Converter & Meeting Planner
Quick answer: 9:00 AM GMT = 7:00 PM AEST (fixed +00:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Greenwich Mean Time (GMT) and Australian Eastern Standard Time (AEST)? You need to account for the standard time difference. Australian Eastern Standard Time is normally 10 hours ahead of Greenwich Mean Time. Whether you are coordinating between teams in London and Dublin and Sydney and Melbourne, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM GMT = 10:00 AM AEST. The full 24-hour GMT to AEST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM GMT = 1:00 AM AEST (+1 day).
| GMT Time | AEST Time |
|---|---|
| 12:00 AM (00:00) | 10:00 AM (10:00) |
| 1:00 AM (01:00) | 11:00 AM (11:00) |
| 2:00 AM (02:00) | 12:00 PM (12:00) |
| 3:00 AM (03:00) | 1:00 PM (13:00) |
| 4:00 AM (04:00) | 2:00 PM (14:00) |
| 5:00 AM (05:00) | 3:00 PM (15:00) |
| 6:00 AM (06:00) | 4:00 PM (16:00) |
| 7:00 AM (07:00) | 5:00 PM (17:00) |
| 8:00 AM (08:00) | 6:00 PM (18:00) |
| 9:00 AM (09:00) | 7:00 PM (19:00) |
| 10:00 AM (10:00) | 8:00 PM (20:00) |
| 11:00 AM (11:00) | 9:00 PM (21:00) |
| 12:00 PM (12:00) | 10:00 PM (22:00) |
| 1:00 PM (13:00) | 11:00 PM (23:00) |
| 2:00 PM (14:00) | 12:00 AM (00:00)+1 day |
| 3:00 PM (15:00) | 1:00 AM (01:00)+1 day |
| 4:00 PM (16:00) | 2:00 AM (02:00)+1 day |
| 5:00 PM (17:00) | 3:00 AM (03:00)+1 day |
| 6:00 PM (18:00) | 4:00 AM (04:00)+1 day |
| 7:00 PM (19:00) | 5:00 AM (05:00)+1 day |
| 8:00 PM (20:00) | 6:00 AM (06:00)+1 day |
| 9:00 PM (21:00) | 7:00 AM (07:00)+1 day |
| 10:00 PM (22:00) | 8:00 AM (08:00)+1 day |
| 11:00 PM (23:00) | 9:00 AM (09:00)+1 day |
Best time to call Sydney from London
For most work calls, compare the normal business day in London (GMT) with the business day in Sydney (AEST). GMT commonly covers Europe, Africa, while AEST is mainly associated with Oceania, Australia.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 12:00 AM GMT, which reaches 9:00 AM AEST near the start of their workday.
- DST Safety: GMT or AEST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- London Stock Exchange: 08:00-16:30 local time in London.
- Australian Securities Exchange (ASX): 10:00-16:00 local time in Sydney.
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Frequently Asked Questions
What is the time difference between GMT and AEST?
During standard time, Australian Eastern Standard Time is 10 hours ahead of Greenwich Mean Time.
What is the difference between GMT and BST?
GMT (Greenwich Mean Time) is the UK's standard winter offset at UTC+0, observed from the last Sunday in October through the last Sunday in March. BST (British Summer Time) is the daylight saving offset at UTC+1, applied each summer when clocks advance one hour.
Is GMT the same as UTC?
GMT and UTC share exactly the same numerical offset — both represent UTC+00:00 — but they are fundamentally different in nature. UTC is an atomic-clock-based international time standard used as the global reference, while GMT is a geographic time zone legally observed by specific countries including the United Kingdom and Ireland during winter months.
Does all of eastern Australia observe Daylight Saving Time?
No — eastern Australia is split on DST. New South Wales (Sydney), Victoria (Melbourne), Tasmania (Hobart), and the ACT (Canberra) advance their clocks to AEDT (UTC+11) each October, while Queensland (Brisbane) opts out entirely and remains on AEST (UTC+10) year-round. This means Sydney and Brisbane run on the same clock for only part of the year.
What is the difference between AEST and AEDT?
AEST (Australian Eastern Standard Time) is the UTC+10:00 offset observed during the Southern Hemisphere winter months, roughly April through October. AEDT (Australian Eastern Daylight Time) is the UTC+11:00 offset applied during the Southern Hemisphere summer when clocks spring forward in October, observed by New South Wales, Victoria, Tasmania, and the ACT.