GMT to CST Converter

Greenwich Mean Time → Central Standard Time · GMT is 6 hours ahead of CST

GMT
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CST
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GMT and CST are the same time

GMT to CST Conversion Table

GMTCST
12:00 AM12:00 AM
1:00 AM1:00 AM
2:00 AM2:00 AM
3:00 AM3:00 AM
4:00 AM4:00 AM
5:00 AM5:00 AM
6:00 AM6:00 AM
7:00 AM7:00 AM
8:00 AM8:00 AM
9:00 AM9:00 AM
10:00 AM10:00 AM
11:00 AM11:00 AM
12:00 PM12:00 PM
1:00 PM1:00 PM
2:00 PM2:00 PM
3:00 PM3:00 PM
4:00 PM4:00 PM
5:00 PM5:00 PM
6:00 PM6:00 PM
7:00 PM7:00 PM
8:00 PM8:00 PM
9:00 PM9:00 PM
10:00 PM10:00 PM
11:00 PM11:00 PM

Green rows = business hours overlap (9:00 AM – 6:00 PM GMT)

Major GMT Cities
  • London
  • Dublin
  • Lisbon
  • Reykjavik
  • Accra
  • Dakar
Major CST Cities
  • Chicago, IL
  • Houston, TX
  • Dallas, TX
  • Minneapolis, MN
  • Kansas City, MO
  • New Orleans, LA
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GMT vs CST — What You Need to Know

GMT (Greenwich Mean Time) is UTC+0. London uses GMT in winter and BST (UTC+1) in British Summer Time from late March to late October.

CST (Central Standard Time) is UTC-6, covering Illinois, Texas, and Minnesota. From March to November it shifts to CDT (UTC-5).

London–Chicago is a key financial corridor. The 6-hour gap in winter means a 2:00 PM GMT call reaches Chicago at 8:00 AM CST — a solid morning start for Central Time.

Frequently Asked Questions

How many hours is GMT ahead of CST?

GMT is 6 hours ahead of CST (Central Standard Time, UTC-6) in winter. During US Daylight Saving Time (CDT, UTC-5), GMT is 5 hours ahead. During UK summer (BST, UTC+1), BST is 7 hours ahead of CST.

What is 12:00 GMT in CST?

12:00 GMT is 6:00 AM CST (UTC-6) in winter, or 7:00 AM CDT (UTC-5) in summer. Subtract 6 hours from GMT to get CST, or subtract 5 hours for CDT.

What time is 9 AM CST in GMT?

9:00 AM CST is 15:00 GMT (3:00 PM). In CDT (US summer), 9:00 AM CDT is 14:00 GMT (2:00 PM).

What is the best overlap window for GMT and CST?

The best overlap window for London (GMT) and Chicago (CST) is 2:00–5:00 PM GMT, which is 8:00–11:00 AM CST. This gives both parties reasonable business hours — London is in mid-afternoon and Chicago is in the morning.