London to Sydney Time Converter
Sydney is usually 11 hours ahead from roughly November to March (GMT vs AEDT), and 9 hours ahead from roughly April to September (BST vs AEST). Brief 10-hour gaps occur during transition weeks.
Daylight saving note: Varies 9–11h: 11h from roughly November to March (GMT vs AEDT), 9h from roughly April to September (BST vs AEST), and 10h during short transition weeks when both are on daylight time.
GMT/BST to AEST/AEDT Conversion Table
Full 24-hour reference table. Use the live clocks above for the exact current offset.
| 🇬🇧 GMT/BST | 🇦🇺 GMT → AEDTUTC+0 to UTC+11 (roughly Nov–Mar) | 🇦🇺 BST → AESTUTC+1 to UTC+10 (roughly Apr–Sep) | 🇦🇺 BST → AEDTUTC+1 to UTC+11 transition weeks | Note |
|---|---|---|---|---|
| 00:00 | 11:00 AM | 9:00 AM | 10:00 AM | |
| 01:00 | 12:00 PM | 10:00 AM | 11:00 AM | |
| 02:00 | 1:00 PM | 11:00 AM | 12:00 PM | |
| 03:00 | 2:00 PM | 12:00 PM | 1:00 PM | |
| 04:00 | 3:00 PM | 1:00 PM | 2:00 PM | |
| 05:00 | 4:00 PM | 2:00 PM | 3:00 PM | |
| 06:00 | 5:00 PM | 3:00 PM | 4:00 PM | |
| 07:00 | 6:00 PM | 4:00 PM | 5:00 PM | |
| 08:00 | 7:00 PM | 5:00 PM | 6:00 PM | |
| 09:00 | 8:00 PM | 6:00 PM | 7:00 PM | |
| 10:00 | 9:00 PM | 7:00 PM | 8:00 PM | |
| 11:00 | 10:00 PM | 8:00 PM | 9:00 PM | |
| 12:00 | 11:00 PM | 9:00 PM | 10:00 PM | |
| 13:00 | 12:00 AM | 10:00 PM | 11:00 PM | next day |
| 14:00 | 1:00 AM | 11:00 PM | 12:00 AM | next day |
| 15:00 | 2:00 AM | 12:00 AM | 1:00 AM | next day |
| 16:00 | 3:00 AM | 1:00 AM | 2:00 AM | next day |
| 17:00 | 4:00 AM | 2:00 AM | 3:00 AM | next day |
| 18:00 | 5:00 AM | 3:00 AM | 4:00 AM | next day |
| 19:00 | 6:00 AM | 4:00 AM | 5:00 AM | next day |
| 20:00 | 7:00 AM | 5:00 AM | 6:00 AM | next day |
| 21:00 | 8:00 AM | 6:00 AM | 7:00 AM | next day |
| 22:00 | 9:00 AM | 7:00 AM | 8:00 AM | next day |
| 23:00 | 10:00 AM | 8:00 AM | 9:00 AM | next day |
* "next day" = converted time falls on the following calendar day.
Best Hours to Schedule London–Sydney Calls
The viable London–Sydney overlap is early morning in London. From roughly April to September, 7:00–9:00 AM London is 4:00–6:00 PM in Sydney; from roughly November to March, the same slot is 6:00–8:00 PM in Sydney, after the Sydney workday. An 8:00 AM London call is 5:00 PM (April–September) or 7:00 PM (November–March) in Sydney.
About London (GMT/BST)
London (GMT/BST) and Sydney (AEST/AEDT) both observe daylight saving, but in opposite seasons. While London is on BST and Sydney on AEST (roughly April to September) the gap is 9 hours; while London is on GMT and Sydney on AEDT (roughly November to March) it is 11 hours; in the short transition weeks when both are on daylight time it is 10. Each DST shift by either city changes the conversion.
About Sydney (AEST/AEDT)
Sydney uses AEST (UTC+10) from April to October and AEDT (UTC+11) from October to April, the opposite season to London's daylight saving, so the London–Sydney gap moves between 9 and 11 hours across the year.
How to Avoid London–Sydney Conversion Mistakes
Sydney is already on the next calendar day from these GMT/BST times onward: 1:00 PM for GMT → AEDT, 3:00 PM for BST → AEST, 2:00 PM for BST → AEDT. For example, 11:00 PM GMT/BST is 10:00 AM in Sydney on the next day (GMT → AEDT).
Abbreviations can be ambiguous here: London switches between GMT and BST across the year, while Sydney switches between AEST and AEDT. City names and IANA time zones (Europe/London and Australia/Sydney) are safer for exact scheduling if you're automating anything, since they resolve the right abbreviation automatically instead of needing a manual seasonal check.
Frequently Asked Questions
How many hours ahead is Sydney from London?
Sydney is usually 11 hours ahead from roughly November to March (GMT vs AEDT), and 9 hours ahead from roughly April to September (BST vs AEST). Brief 10-hour gaps occur during transition weeks.
What time is 8 AM London in Sydney?
8:00 AM London is 7:00 PM in Sydney from roughly November to March (GMT vs AEDT) and 5:00 PM from roughly April to September (BST vs AEST).
What is the best overlap for London-Sydney calls?
Early morning in London. From roughly April to September, 7:00–9:00 AM London is 4:00–6:00 PM in Sydney, inside both workdays. From roughly November to March the same slot is 6:00–8:00 PM in Sydney, so keep calls as early as London allows.
Does Australia observe daylight saving?
Yes, but in the Southern Hemisphere summer (October–April). Sydney (NSW) switches to AEDT (UTC+11) in October and reverts to AEST (UTC+10) in April — the inverse of the UK schedule.