GMT to CT Time Converter

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

London · Greenwich Mean Time
07:11:04
Monday, May 11, 2026
GMT+1 · UTC+01:00
Chicago · Central Time
01:11:04
Monday, May 11, 2026
CDT · UTC-05:00

Convert a specific time

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

Daylight Saving status right now

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
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

When can GMT and CT 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
GMT
CT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in London (GMT). 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: 15:00–16:00 GMT (09:00–10:00 CT).

Hour-by-hour GMT to CT conversion table

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

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

Sun today in London and Chicago

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

Related converters

CT to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to ISTEST to CTPST to CTUTC to CTCET to CTIST to CT
Looking for local time? See time in London or time in Chicago.

Frequently asked questions

What is the time difference between GMT and CT right now?+
CT (Central Time) is currently 6 hours behind GMT (Greenwich Mean Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does GMT or CT observe daylight saving time?+
GMT: observes daylight saving time. CT: observes daylight saving time.
When is the best time to schedule a meeting between GMT and CT?+
The strongest overlap is 15:00–16:00 GMT (09:00–10:00 CT), giving 2 hours when both sides are within standard 9am-5pm working hours.
What time is it in Chicago when it is 12:00 noon in London?+
When it is 12:00 Mon in London (GMT), it is 06:00 Mon in Chicago (CT).
Which IANA time zone identifiers are used for GMT and CT?+
GMT maps to "Europe/London" in the IANA database. CT maps to "America/Chicago". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is London ahead of or behind Chicago?+
Whether London (GMT) is ahead of or behind Chicago (CT) depends on the current UTC offsets. Right now CT is 6 hours behind GMT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for GMT and CT?+
GMT is UTC+01:00 (GMT+1) and CT is UTC-05:00 (CDT). 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 GMT and CT?+
Yes. There are 2 hours of overlap during standard 9am-5pm working hours, with the strongest window at 15:00–16:00 GMT.