GMT to CDT Time Converter

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

London · Greenwich Mean Time
23:09:39
Wednesday, May 6, 2026
GMT+1 · UTC+01:00
Chicago · Central Daylight Time
17:09:39
Wednesday, May 6, 2026
CDT · UTC-05:00

Convert a specific time

From: GMT (London)
To: CDT (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
CDT (Central Daylight 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 CDT meet?

2 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 15:00–16:00 GMT (09:00–10:00 CDT).

Hour-by-hour GMT to CDT conversion table

GMT time (London)CDT time (Chicago)Status
00:00 Wed18:00 TueOff-hours both sides
01:00 Wed19:00 TueOff-hours both sides
02:00 Wed20:00 TueOff-hours both sides
03:00 Wed21:00 TueOff-hours both sides
04:00 Wed22:00 TueOff-hours both sides
05:00 Wed23:00 TueOff-hours both sides
06:00 Wed00:00 WedOff-hours both sides
07:00 Wed01:00 WedOff-hours both sides
08:00 Wed02:00 WedOff-hours both sides
09:00 Wed03:00 WedGMT working
10:00 Wed04:00 WedGMT working
11:00 Wed05:00 WedGMT working
12:00 Wed06:00 WedGMT working
13:00 Wed07:00 WedGMT working
14:00 Wed08:00 WedGMT working
15:00 Wed09:00 WedBoth at work
16:00 Wed10:00 WedBoth at work
17:00 Wed11:00 WedCDT working
18:00 Wed12:00 WedCDT working
19:00 Wed13:00 WedCDT working
20:00 Wed14:00 WedCDT working
21:00 Wed15:00 WedCDT working
22:00 Wed16:00 WedCDT working
23:00 Wed17:00 WedOff-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 Daylight Time (CDT)
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
05:24
Sunset
20:31
Solar noon
12:58
Daylight
15h 6m
Chicago
Sunrise
05:41
Sunset
19:55
Solar noon
12:48
Daylight
14h 13m

Related converters

CDT to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to ISTEST to CDTPST to CDTUTC to CDTCET to CDTIST to CDT
Looking for local time? See time in London or time in Chicago.

Frequently asked questions

What is the time difference between GMT and CDT right now?+
CDT (Central Daylight 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 CDT observe daylight saving time?+
GMT: observes daylight saving time. CDT: observes daylight saving time.
When is the best time to schedule a meeting between GMT and CDT?+
The strongest overlap is 15:00–16:00 GMT (09:00–10:00 CDT), 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 Wed in London (GMT), it is 06:00 Wed in Chicago (CDT).
Which IANA time zone identifiers are used for GMT and CDT?+
GMT maps to "Europe/London" in the IANA database. CDT maps to "America/Chicago". These identifiers are what most software libraries use to convert times accurately, including DST handling.