GMT to CST converter: UK time to Central time

In 2026 Chicago is 6 hours behind London until 8 March, 5 hours behind from 8 to 29 March, 6 hours behind from 29 March to 25 October, 5 hours behind from 25 October to 1 November and 6 hours behind for the rest of the year, as the UK and the US change their clocks on different dates.

London12:00 PMSunday 11 Oct · BST

Chicago6:00 AMSunday 11 Oct · CDT

Chicago is 6 h behind London today.

London

01234567891011121314151617181920212223

Chicago

18192021222301234567891011121314151617

9 to 6 working hoursboth at workOverlap: 3 PM–6 PM in London

Your result

Enter your values to see the result.

Daylight saving: local time and fixed GMT and CST

The converter starts with London to Chicago, using local clock rules. For the standard-time offsets all year, use the fixed GMT and CST button.

These examples use noon on the dates shown. A converted date can be the previous or following day.

Starting date and time	Using local city rules	Using fixed GMT and CST
2026-01-15 12:00	2026-01-15 06:00 (UTC-06:00)	2026-01-15 06:00
2026-07-15 12:00	2026-07-15 06:00 (UTC-05:00)	2026-07-15 06:00

12:00 PM Wednesday 15 Jul in London is 6:00 AM Wednesday 15 Jul in Chicago (CDT, 6 h behind).

Why daylight saving conversions need a date explains skipped and repeated clock readings. The rules here come from the browser’s time zone data and can lag a government change.