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