Working-hour overlap
When both cities are at work
There is no full hour when both cities are inside a standard 09:00–17:00 working day. Use an early start in one city or an evening call in the other.
Time converter
London to Sydney
United Kingdom
London
8:5140
Sunday, 18 October 2026BST · UTC+1
Australia
Sydney
18:5140
Sunday, 18 October 2026GMT+11 · UTC+11
Outside usual working hours
19:00GMT+11
Sunday, 18 October 2026 in Sydney
10 hours ahead of London
Working together
The useful part of the difference
A difficult but important UK–Australia calling corridor.
Calendar boundary
Check the date, not just the hour
At 09:00 in London, Sydney is on the same calendar date.
Daylight saving time
The gap can move during the year
Seasonal clock changes alter the gap: it is 11 hours ahead on the January reference date and 9 hours ahead on the July reference date. Transition weeks can differ again, so check the exact date.