CT to GMT Time Converter

Convert Central Time (CT) to Greenwich Mean Time (GMT). Both time zones are shown live below; current offset between them is 6 hours ahead.

Chicago · Central Time
01:10:55
Monday, May 11, 2026
CDT · UTC-05:00
London · Greenwich Mean Time
07:10:55
Monday, May 11, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: CT (Chicago)
To: GMT (London)
--:--

Daylight Saving status right now

CT (Central Time)
Observes DST
Yes
In DST right now
Yes
Next fall back
2026-11-01
Offset shift
UTC-05:00 → UTC-06:00
GMT (Greenwich Mean Time)
Observes DST
Yes
In DST right now
Yes
Next fall back
2026-10-25
Offset shift
UTC+01:00 → UTC+00:00

When can CT and GMT meet?

00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
CT
GMT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Chicago (CT). Each row shows the local working-hours state in that zone for the same moment in time.
2 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 09:00–10:00 CT (15:00–16:00 GMT).

Hour-by-hour CT to GMT conversion table

CT time (Chicago)GMT time (London)Status
00:00 Mon06:00 MonOff-hours both sides
01:00 Mon07:00 MonOff-hours both sides
02:00 Mon08:00 MonOff-hours both sides
03:00 Mon09:00 MonGMT working
04:00 Mon10:00 MonGMT working
05:00 Mon11:00 MonGMT working
06:00 Mon12:00 MonGMT working
07:00 Mon13:00 MonGMT working
08:00 Mon14:00 MonGMT working
09:00 Mon15:00 MonBoth at work
10:00 Mon16:00 MonBoth at work
11:00 Mon17:00 MonCT working
12:00 Mon18:00 MonCT working
13:00 Mon19:00 MonCT working
14:00 Mon20:00 MonCT working
15:00 Mon21:00 MonCT working
16:00 Mon22:00 MonCT working
17:00 Mon23:00 MonOff-hours both sides
18:00 Mon00:00 TueOff-hours both sides
19:00 Mon01:00 TueOff-hours both sides
20:00 Mon02:00 TueOff-hours both sides
21:00 Mon03:00 TueOff-hours both sides
22:00 Mon04:00 TueOff-hours both sides
23:00 Mon05:00 TueOff-hours both sides

Times computed for today in each zone using the IANA time zone database. The conversion accounts for daylight saving time wherever applicable.

About these time zones

Central Time (CT)
IANA identifier
America/Chicago
Current UTC offset
UTC-05:00
Current abbreviation
CDT
Major cities in this zone
ChicagoHoustonDallasAustinNew Orleans
Greenwich Mean Time (GMT)
IANA identifier
Europe/London
Current UTC offset
UTC+01:00
Current abbreviation
GMT+1
Major cities in this zone
LondonManchesterEdinburghBirmingham

Sun today in Chicago and London

Chicago
Sunrise
05:35
Sunset
20:00
Solar noon
12:48
Daylight
14h 24m
London
Sunrise
05:16
Sunset
20:39
Solar noon
12:58
Daylight
15h 23m

Related converters

GMT to CT (reverse)CT to ESTCT to PSTCT to UTCCT to CETCT to ISTEST to GMTPST to GMTUTC to GMTCET to GMTIST to GMT
Looking for local time? See time in Chicago or time in London.

Frequently asked questions

What is the time difference between CT and GMT right now?+
GMT (Greenwich Mean Time) is currently 6 hours ahead CT (Central Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does CT or GMT observe daylight saving time?+
CT: observes daylight saving time. GMT: observes daylight saving time.
When is the best time to schedule a meeting between CT and GMT?+
The strongest overlap is 09:00–10:00 CT (15:00–16:00 GMT), giving 2 hours when both sides are within standard 9am-5pm working hours.
What time is it in London when it is 12:00 noon in Chicago?+
When it is 12:00 Mon in Chicago (CT), it is 18:00 Mon in London (GMT).
Which IANA time zone identifiers are used for CT and GMT?+
CT maps to "America/Chicago" in the IANA database. GMT maps to "Europe/London". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Chicago ahead of or behind London?+
Whether Chicago (CT) is ahead of or behind London (GMT) depends on the current UTC offsets. Right now GMT is 6 hours ahead CT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for CT and GMT?+
CT is UTC-05:00 (CDT) and GMT is UTC+01:00 (GMT+1). Both offsets shift by one hour when the corresponding region enters or exits daylight saving time, so the live values on this page are the source of truth.
Can I schedule meetings during business hours for both CT and GMT?+
Yes. There are 2 hours of overlap during standard 9am-5pm working hours, with the strongest window at 09:00–10:00 CT.