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Time zonesLive · DST-aware

GMT to CST Converter

See the current time in GMT (Greenwich) and CST (Chicago) side by side, the exact time difference right now, and convert any time between the two zones.

Quick presets

GMT to CST Converter

GMT
Greenwich
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CST
Chicago
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Uses your browser's built-in, DST-aware time-zone data.

ToolFeather · Intl API

About converting GMT to CST

Greenwich Mean Time (Greenwich) and Central Time (Chicago) are in different time zones, so a meeting, call or stream that's convenient in one may be early or late in the other. The clocks above update live and account for daylight saving automatically, so the time difference you see is the real one for today — not a fixed number that goes stale twice a year.

To plan across the two, type a time into the GMT box (or tap a quick preset) and read the CST equivalent, including a "next day" or "previous day" note when the conversion crosses midnight. For any other pair of zones or cities, use the full timezone converter.

GMT vs CST: the time difference through the year

The gap between GMT and CST changes during the year because only one of them uses daylight saving.

PeriodDifference
Oct 23, 2026 – Oct 31, 2026CST 5 h behind GMT
Nov 1, 2026 – Mar 13, 2027CST 6 h behind GMT
Mar 14, 2027 – Oct 23, 2027CST 5 h behind GMT

Daylight-saving changes in the next year

ZoneDateOffsetChange
CSTNov 1, 2026UTC−5 → UTC−6Clocks go back 1 hour
CSTMar 14, 2027UTC−6 → UTC−5Clocks go forward 1 hour
CSTNov 7, 2027UTC−5 → UTC−6Clocks go back 1 hour

GMT to CST conversion table

GMTCST (when 5 h behind)CST (when 6 h behind)
12:00 AM7:00 PM (previous day)6:00 PM (previous day)
1:00 AM8:00 PM (previous day)7:00 PM (previous day)
2:00 AM9:00 PM (previous day)8:00 PM (previous day)
3:00 AM10:00 PM (previous day)9:00 PM (previous day)
4:00 AM11:00 PM (previous day)10:00 PM (previous day)
5:00 AM12:00 AM11:00 PM (previous day)
6:00 AM1:00 AM12:00 AM
7:00 AM2:00 AM1:00 AM
8:00 AM3:00 AM2:00 AM
9:00 AM4:00 AM3:00 AM
10:00 AM5:00 AM4:00 AM
11:00 AM6:00 AM5:00 AM
12:00 PM7:00 AM6:00 AM
1:00 PM8:00 AM7:00 AM
2:00 PM9:00 AM8:00 AM
3:00 PM10:00 AM9:00 AM
4:00 PM11:00 AM10:00 AM
5:00 PM12:00 PM11:00 AM
6:00 PM1:00 PM12:00 PM
7:00 PM2:00 PM1:00 PM
8:00 PM3:00 PM2:00 PM
9:00 PM4:00 PM3:00 PM
10:00 PM5:00 PM4:00 PM
11:00 PM6:00 PM5:00 PM

Best time to meet

The two zones

GMT · Greenwich Mean Time

Greenwich Mean Time is UTC+0 all year. It is the base for world time; the UK uses GMT only in winter and switches to BST in summer.

CST · Central Time

Central Time is UTC−6 in winter (CST) and UTC−5 in summer (CDT). It covers Chicago, Dallas, Houston, Mexico City (which no longer uses DST) and Winnipeg. US daylight saving runs from the second Sunday in March to the first Sunday in November.

Frequently asked questions

6 answers
What is the time difference between GMT and CST?
It's shown live at the top of this page (and it can change with daylight saving). The converter uses the current, DST-aware difference between Greenwich Mean Time and Central Time, so the time you see is always right for right now.
How do I convert GMT to CST?
Enter a time in the GMT box and the equivalent CST time appears instantly, adjusted for the current offset between the two zones — including a note if it lands on the previous or next day.
Is this GMT to CST converter accurate with daylight saving?
Yes. It uses your browser's built-in time-zone database (the IANA zones behind Greenwich and Chicago), which tracks daylight-saving changes automatically, so the current times and difference are correct.
What time is it in Chicago right now?
The live clock above shows the current time in Chicago (CST), updating every second, alongside GMT.
Does the GMT to CST time difference change?
Yes. Over the next 12 months it is 5 h behind or 6 h behind, depending on the date — see the table of periods on this page.
What is a good meeting time for GMT and CST?
Office hours overlap from 2:00 PM to 5:00 PM GMT (9:00 AM to 12:00 PM CST).