Working-hour overlap
When both cities are at work
15:00–17:00 in London overlaps with 9:00–11:00 in Chicago.
Time converter
London to Chicago
United Kingdom
London
12:5832
Wednesday, 29 July 2026BST · UTC+1
United States
Chicago
6:5832
Wednesday, 29 July 2026GMT-5 · UTC−5
Outside usual working hours
3:00GMT-5
Wednesday, 29 July 2026 in Chicago
6 hours behind London
Working together
The useful part of the difference
A major central-US to UK business and travel route.
Calendar boundary
Check the date, not just the hour
At 09:00 in London, Chicago is on the same calendar date.
Daylight saving time
The gap can move during the year
The usual gap is stable in the January and July reference dates at 6 hours behind.