Sydney to London Time Difference

Sydney to London Time Difference — Live Calculator & Conversion Table

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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. Sydney observes AEDT (UTC+11) in its summer (October–April) and AEST (UTC+10) in its winter. London observes BST (UTC+1) from late March to late October. This creates three possible gaps: 9h, 10h, or 11h.

London behind (Dec–Mar)

−11h

GMT vs AEDT

London behind (Apr–Sep)

−9h

BST vs AEST

Sydney timezone

AEST / AEDT

UTC+10 / UTC+11

London timezone

GMT / BST

UTC+0 / UTC+1

Best Times to Schedule a Meeting

With a 9–11 hour gap, business overlap is very limited. The only workable window is 17:00–19:00 Sydney time, which falls in London early morning (07:00–09:00).

Sydney time	London time	Season	Suitability
17:00–19:00 Sydney	07:00–09:00 (winter, GMT/AEDT)	Oct–Mar	Marginal
17:00–19:00 Sydney	08:00–10:00 (summer, BST/AEST)	Apr–Sep	Marginal

Time Difference by Month

Highlighted months indicate when a DST transition changes the difference.

Jan

11h

Feb

11h

Mar

11h

Apr

May

Jun

Jul

Aug

Sep

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 and GMT (UTC+0) Oct–Mar. The overlap of their DST calendars creates three possible gaps.

Event	Sydney	London	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 behind London is Sydney?

London is 11 hours behind Sydney in the Australian summer/northern winter (Dec–Mar), 9 hours behind in the Australian winter/northern summer (Apr–Sep), and 10 hours behind during brief transitions. Both cities observe DST but in opposite seasons.

What time is it in London when it is noon in Sydney?

When it is 12:00 noon in Sydney (AEDT, summer), it is 01:00 in London (GMT). When it is noon in Sydney (AEST, winter), it is 03:00 in London (BST). The answer varies because both cities observe DST.

What is the best time to call London from Sydney?

The best window is 17:00–19:00 Sydney time (07:00–09:00 London in winter, 08:00–10:00 in summer). There is virtually no overlap during standard business hours.

Do both Sydney and London observe Daylight Saving Time?

Yes — but in opposite hemispheres. Sydney observes AEDT (UTC+11) in its summer (October–April). London observes BST (UTC+1) from late March to late October. Their opposite DST seasons create varying gaps of 9h, 10h, or 11h throughout the year.

When does the Sydney–London 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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