GMT to CST converter

GMT to CST quick reference

GMT or BST, CST or CDT? Daylight saving explained

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).

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.

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

How the gap changes during the year

Chicago is 6 hours behind London 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 London. Green means that side is inside a 9–5 working day. There is 2 h of shared 9–5 time; the easiest window is 1 PM–10 PM GMT (7 AM–4 PM CST).

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

Example conversions

Questions people ask

What is the time difference between GMT and CST?

Chicago is 6 h behind London 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 GMT to CST 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 GMT to CST?

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

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

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

What time is 9 PM CST in GMT?

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

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).

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.

Is MeetETA free?

Yes. MeetETA is free, shows no ads and needs no account. Your cities and settings stay in your browser, and where consent is required, analytics only load after you accept cookies.