CST to GMT converter: Central time to UK time

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

Chicago12:00 PMSunday 11 Oct · CDT

London6:00 PMSunday 11 Oct · BST

London is 6 h ahead Chicago today.

Chicago

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London

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9 to 6 working hoursboth at workOverlap: 9 AM–12 PM in Chicago

Your result

Enter your values to see the result.

Daylight saving: local time and fixed CST and GMT

The converter starts with Chicago to London, using local clock rules. For the standard-time offsets all year, use the fixed CST and GMT 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 CST and GMT
2026-01-15 12:00	2026-01-15 18:00 (UTC+00:00)	2026-01-15 18:00
2026-07-15 12:00	2026-07-15 18:00 (UTC+01:00)	2026-07-15 18:00

12:00 PM Wednesday 15 Jul in Chicago is 6:00 PM Wednesday 15 Jul in London (BST, 6 h ahead).

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.