Convert London time to Chicago time

Hour by hour

The whole day mapped across: read down the left for London, across for Chicago.

Daylight saving time

London and Chicago both observe daylight saving. Where their change dates differ, so does the gap between them for the weeks in between.

When you can actually talk

You have 3 hours of shared working time: 15:00–18:00 in London, which is 09:00–12:00 in Chicago.

• London 15:00–18:00Chicago 09:00–12:00

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between London and Chicago?

Chicago is 6 hours behind London. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Chicago from London?

Between 15:00–18:00 in London, which is 09:00–12:00 in Chicago. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does London observe daylight saving time?

Yes. London runs on UTC+0 in winter and UTC+1 in summer. The next change is on 2026-10-25, when clocks go back by 60 minutes.

Does Chicago observe daylight saving time?

Yes. Chicago runs on UTC-6 in winter and UTC-5 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.

If it is midday in London, what time is it in Chicago?

It is 06:00 in Chicago, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do London and Chicago use?

London uses Europe/London, currently UTC+1 (BST), and Chicago uses America/Chicago, currently UTC-5 (CDT). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.