The World Clock Converter
Event Planner

CST to GMT Time Converter

Compare CST and GMT instantly. The clocks below stay in sync with the IANA time-zone database, so daylight-saving transitions are handled automatically for both Chicago and GMT.

Saturday, Jul 25
01:33
:16AM
Today
Saturday, Jul 25
07:33
:16AM
Today

24-Hour Comparison Timeline

Green = working hours · Yellow = early/late · Red = night

● Best window: 9 AM–12 PM (Chicago)
🇺🇸Chicago
7PM
8PM
9PM
10PM
11PM
12AM
1AM
2AM
3AM
4AM
5AM
6AM
7AM
8AM
9AM
10AM
11AM
12PM
1PM
2PM
3PM
4PM
5PM
6PM
🇬🇧London
12AM
1AM
2AM
3AM
4AM
5AM
6AM
7AM
8AM
9AM
10AM
11AM
12PM
1PM
2PM
3PM
4PM
5PM
6PM
7PM
8PM
9PM
10PM
11PM

24-hour reference table

CST (Chicago)GMT (GMT)
12:00 AM05:00 AM
01:00 AM06:00 AM
02:00 AM07:00 AM
03:00 AM08:00 AM
04:00 AM09:00 AM
05:00 AM10:00 AM
06:00 AM11:00 AM
07:00 AM12:00 PM
08:00 AM01:00 PM
09:00 AM02:00 PM
10:00 AM03:00 PM
11:00 AM04:00 PM
12:00 PM05:00 PM
01:00 PM06:00 PM
02:00 PM07:00 PM
03:00 PM08:00 PM
04:00 PM09:00 PM
05:00 PM10:00 PM
06:00 PM11:00 PM
07:00 PM12:00 AM(Sun, Jul 26)
08:00 PM01:00 AM(Sun, Jul 26)
09:00 PM02:00 AM(Sun, Jul 26)
10:00 PM03:00 AM(Sun, Jul 26)
11:00 PM04:00 AM(Sun, Jul 26)

Daylight saving time

Chicago observes daylight saving time; GMT does not. Expect a one-hour swing when Chicago starts or ends DST.

Working-hours overlap

9 AM–12 PM CST (2 PM–5 PM GMT) — the shared 9-to-5 window for meetings.

Frequently asked questions

What is the time difference between CST and GMT?+

GMT (UTC+00:00) is currently 5 hours ahead of CST (UTC-05:00). This page recalculates the offset live from the IANA time-zone database, including any daylight-saving transitions.

Does CST or GMT observe daylight saving time?+

Chicago observes daylight saving time; GMT does not, so the gap changes when Chicago springs forward or falls back. Times on this page always reflect the current local rules.

What are the best meeting hours between Chicago and GMT?+

Standard 9–5 working hours in Chicago and GMT overlap from 9 AM to 12 PM CST (2 PM–5 PM GMT). Schedule calls inside this window to keep both sides in normal business hours.

How do I quickly convert CST to GMT?+

Use the live clocks and 24-hour reference table above. Pick any hour on the CST row to see the matching GMT time. The Event Planner also lets you pick a specific date and share it with attendees.

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