London
Chicago
Convert GMT to CST
Greenwich Mean Time to Central Standard Time — Chicago is 6 hours behind London
Quick Facts
Time Difference
-6 hours
GMT Full Name
Greenwich Mean Time
CST Full Name
Central Standard Time
GMT to CST Conversion Table
Related Conversions
About GMT and CST Time Zones
GMT (Greenwich Mean Time) is UTC+0 and covers cities like London, Dublin, Lisbon. CST (Central Standard Time) is UTC-6 and covers cities like Chicago, Dallas, Houston.
When it's 12:00 PM (noon) in London (GMT), it's 6:00 AM in Chicago (CST). The time difference between GMT and CST is 6 hours — Chicago is behind London.
The best meeting window is 9:00 AM–11:00 AM GMT (3:00 PM–5:00 PM CST).
Daylight Saving Time
CST observes Daylight Saving Time and becomes CDT (Central Daylight Time) during summer months, shifting clocks forward by 1 hour to UTC-5.
During DST transitions, the time difference between GMT and CST may shift by ±1 hour. Always verify the current offset above for the most accurate conversion.
Use our world clock tool to compare London and Chicago with a visual timeline, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between GMT and CST?
Chicago (CST) is 6 hours behind London (GMT). The offset is -6 hours.
Is CST ahead or behind GMT?
CST is 6 hours behind GMT. GMT is UTC+1 and CST is UTC-5.
When it's 12:00 PM in London, what time is it in Chicago?
When it's 12:00 PM (noon) in London (GMT), it's 6:00 AM in Chicago (CST).
When it's 5:00 PM in London, what time is it in Chicago?
When it's 5:00 PM in London (GMT), it's 11:00 AM in Chicago (CST).
Does CST change for Daylight Saving Time?
Yes. CST (Central Standard Time, UTC-6) becomes CDT (Central Daylight Time, UTC-5) in summer, shifting clocks forward 1 hour.