CST to GMT converter

CST to GMT quick reference

CST or CDT, GMT or BST? Daylight saving explained

CST (UTC−6) is the winter name and CDT (UTC−5) the summer name. “CST” usually means local Central time (Chicago, Dallas, Houston) whatever the season, so MeetETA reads it that way and handles daylight saving for the date you pick.

GMT (UTC+0) is UK winter time; from late March to late October the UK is on BST (UTC+1). People who say “GMT” for a London meeting usually mean UK time, so this page uses London time. If you mean GMT as a fixed UTC+0 all year, it is the same as UTC (and that is how the type-a-time box reads the word “GMT”; type “London” for UK time).

Right now Chicago is on CDT, UTC−5 and London is on BST, UTC+1 (the clocks at the top of the page always show the live values).

How the gap changes during the year

London is 6 hours ahead of Chicago for most of the year. For a few weeks it is 5 h, because the two sides change their clocks on different dates.

Working-day overlap, hour by hour

Each row is an hour in Chicago. Green means that side is inside a 9–5 working day. There is 2 h of shared 9–5 time; the easiest window is 7 AM–4 PM CST (1 PM–10 PM GMT).

Shows Chicago 5 AM to 10 PM. Times on the London side may fall on the next day.

Example conversions

Questions people ask

What is the time difference between CST and GMT?

London is 6 h ahead of Chicago for most of the year. For a few weeks in spring and autumn it is 5 h, because the two sides change their clocks on different dates. Right now it is 6 h.

Does the CST to GMT difference change with daylight saving?

Both sides use daylight saving, so the gap only changes when they switch on different dates (see the table above).

How do I convert 3 PM CST to GMT?

3 PM CST is 9 PM GMT. Or just type “3 PM CST” in the converter at the top of this page.

When can US Central time and the UK meet during work hours?

There is 2 h of shared 9–5 time; the most comfortable window is 7 AM–4 PM CST (1 PM–10 PM GMT).

What time is 9 PM GMT in CST?

9 PM GMT is 3 PM CST. For other times, type something like “9 PM GMT” in the converter.

Should I write CST or CDT?

CST (UTC−6) is the winter name and CDT (UTC−5) the summer name. “CST” usually means local Central time (Chicago, Dallas, Houston) whatever the season, so MeetETA reads it that way and handles daylight saving for the date you pick.

Should I write GMT or BST?

GMT (UTC+0) is UK winter time; from late March to late October the UK is on BST (UTC+1). People who say “GMT” for a London meeting usually mean UK time, so this page uses London time. If you mean GMT as a fixed UTC+0 all year, it is the same as UTC (and that is how the type-a-time box reads the word “GMT”; type “London” for UK time).

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