GMT → CST Converter
London to Chicago — UK financial markets coordinating with CME (Chicago Mercantile Exchange), the world's largest derivatives exchange.
GMT → CST
7:40 PM
British Summer Time (GMT+1)
Thursday, June 11, 2026
UTC+1 (DST active)
1:40 PM
Central Daylight Time (CDT)
Thursday, June 11, 2026
UTC-5 (DST active)
Time Zone Converter
GMT·London
7:40 PM
Thursday, June 11, 2026
CST·Chicago
1:40 PM
Thursday, June 11, 2026
Compare Times
| GMT | CST |
|---|
Morning
| GMT | CST |
|---|---|
| 12:00 AM GMT | 6:00 PM CST |
| 1:00 AM GMT | 7:00 PM CST |
| 2:00 AM GMT | 8:00 PM CST |
| 3:00 AM GMT | 9:00 PM CST |
| 4:00 AM GMT | 10:00 PM CST |
| 5:00 AM GMT | 11:00 PM CST |
| 6:00 AM GMT | 12:00 AM CST |
| 7:00 AM GMT | 1:00 AM CST |
| 8:00 AM GMT | 2:00 AM CST |
| 9:00 AM GMT | 3:00 AM CST |
| 10:00 AM GMT | 4:00 AM CST |
| 11:00 AM GMT | 5:00 AM CST |
Afternoon
| GMT | CST |
|---|---|
| 12:00 PM GMT | 6:00 AM CST |
| 1:00 PM GMT | 7:00 AM CST |
| 2:00 PM GMT | 8:00 AM CST |
| 3:00 PM GMT | 9:00 AM CST |
| 4:00 PM GMT | 10:00 AM CST |
Evening
| GMT | CST |
|---|---|
| 5:00 PM GMT | 11:00 AM CST |
| 6:00 PM GMT | 12:00 PM CST |
| 7:00 PM GMT | 1:00 PM CST |
| 8:00 PM GMT | 2:00 PM CST |
| 9:00 PM GMT | 3:00 PM CST |
| 10:00 PM GMT | 4:00 PM CST |
| 11:00 PM GMT | 5:00 PM CST |
Frequently Asked Questions: GMT to CST
What is the time difference between UK Time and Central Time?
CST is 6 hours behind GMT (standard time).
What time is midnight in GMT in CST?
Midnight (12:00 AM) in UK Time translates to 6:00 PM CST in Central Time.
When do business hours overlap between GMT and CST?
The business hours overlap window is 15:00–17:00 GMT (09:00–11:00 CST). The shared window is limited; aim for the earlier part of this range when possible.
Common Time Conversions
EST · New York →
CST · Chicago →
MST · Denver →
PST · Los Angeles →
AKST · Anchorage →
HST · Honolulu →
UTC · Universal →
GMT · London →
IST · New Delhi →
CET · Paris →
How Time Zone Conversion Works
Time zone conversion works by comparing the UTC offset of one location to another. Every city or region is measured relative to Coordinated Universal Time (UTC), which acts as the global reference point for civil time.
CST is 6 hours behind GMT (standard time).
Daylight Saving Time: Both GMT and CST observe DST, but switch on different dates. For a few weeks each spring and autumn, the gap shifts by 1 hour — a common source of missed meetings and calendar tool errors.
Best time to call Chicago from London
Planning a remote meeting or international call? The optimal business hours overlap between London and Chicago is moderate, with a limited shared window to work with.
Try Meeting Planner for multi-city group scheduling →GMT
15:00–17:00
Greenwich Time
CST
09:00–11:00
Central Time
Recommended time: 16:00 GMT / 10:00 CST
DST schedule for 2026
Current-year daylight saving start and end dates for the selected zones.
GMT · Greenwich Time
Standard offset +00:00
- Starts
- Mar 29, 2026 · 01:00 → 02:00
- last_sunday_of_march
- Ends
- Oct 25, 2026 · 02:00 → 01:00
- last_sunday_of_october
- Daylight time
- BST · +01:00
GMT countries vary. The UK, Ireland, and Portugal observe summer time; Iceland and most of West Africa remain on GMT year-round.
CST · Central Time
Standard offset −06:00
- Starts
- Mar 8, 2026 · 02:00 → 03:00
- second_sunday_of_march
- Ends
- Nov 1, 2026 · 02:00 → 01:00
- first_sunday_of_november
- Daylight time
- CDT · −05:00
Most of Mexico no longer observes DST as of 2022; only a few border-state municipalities still do.
Principal Cities
GMT — Greenwich Time
- LondonUnited Kingdom
- DublinIreland
- LisbonPortugal
- CasablancaMorocco
CST — Central Time
- Mexico CityMexico
- ChicagoUnited States
- HoustonUnited States
- GuadalajaraMexico
Flight Information
Route
LHR ↔ ORD
Avg. flight time
8h
Direct flights
Available
~8h direct flight.