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Location 1 UTC offset
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Location 2 UTC offset
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Time Difference Table
| Location 1 | Location 2 |
|---|
Sydney is 9–11 hours ahead of London depending on the time of year. Both cities observe DST — but in opposite hemispheres, so their DST seasons are inverted. This creates three possible gaps: 9h, 10h, or 11h across the year.
Dec–Mar difference
+11h
GMT vs AEDT
Apr–Sep difference
+9h
BST vs AEST
London timezone
GMT / BST
UTC+0 / UTC+1
Sydney timezone
AEST / AEDT
UTC+10 / UTC+11
Best Times to Schedule a Meeting
With a 9–11 hour gap, overlap is very limited. The only workable window is 07:00–09:00 London time, which falls in Sydney late afternoon (16:00–20:00 depending on season).
| London time | Sydney time | Season | Suitability |
|---|---|---|---|
| 07:00–09:00 | 16:00–18:00 (summer BST/AEST) | Apr–Sep | Marginal |
| 07:00–09:00 | 18:00–20:00 (winter GMT/AEDT) | Oct–Mar | Marginal |
Time Difference by Month
Highlighted months indicate when a DST transition changes the difference.
Jan
11h
Feb
11h
Mar
11h
Apr
9h
May
9h
Jun
9h
Jul
9h
Aug
9h
Sep
9h
Oct
10h
Nov
11h
Dec
11h
Daylight Saving Time Schedule
Both cities observe DST in opposite seasons. Sydney is AEDT (UTC+11) Oct–Apr and AEST (UTC+10) Apr–Oct. London is BST (UTC+1) Mar–Oct. Three possible gaps: 9h, 10h, or 11h.
| Event | London | Sydney | Effect |
|---|---|---|---|
| Sydney springs forward (AEST→AEDT) | First Sunday of October, 02:00 | — | varies |
| London springs forward (GMT→BST) | Last Sunday of March, 01:00 | — | 9h Apr–Oct |
| Sydney falls back (AEDT→AEST) | First Sunday of April, 03:00 | — | varies |
| London falls back (BST→GMT) | Last Sunday of October, 02:00 | — | 11h Nov–Mar |
Frequently Asked Questions
How many hours ahead is Sydney compared to London?
Sydney is 11 hours ahead in northern winter/Australian summer (Dec–Mar), 9 hours ahead in northern summer/Australian winter (Apr–Sep), and 10 hours ahead during brief transitions. Both cities observe DST in opposite seasons.
Do both London and Sydney observe Daylight Saving Time?
Yes — but in opposite hemispheres. Sydney observes AEDT (UTC+11) Oct–Apr and AEST (UTC+10) Apr–Oct. London observes BST (UTC+1) from late March to late October.
What is the best time to call Sydney from London?
The only workable window is 07:00–09:00 London time (approx 16:00–20:00 in Sydney depending on season).
If it is noon in London, what time is it in Sydney?
Noon in London (GMT) = 23:00 in Sydney (AEDT). Noon in London (BST) = 21:00 in Sydney (AEST).
When does the London–Sydney time difference change?
Four times a year: Sydney springs forward (first Sunday October), London springs forward (last Sunday March), Sydney falls back (first Sunday April), London falls back (last Sunday October). Possible gaps: 9h, 10h, or 11h.
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