GMT vs CST
Greenwich Mean Time / UK (GMT/BST) is UTC+0 in winter and UTC+1 in summer. Central Time (US & Canada) (CST/CDT) is UTC−6 in winter and UTC−5 in summer.
The difference is a constant 6 hours behind — both zones switch to daylight saving on the same dates.
GMT to CST conversion table
Applies all year:
| GMT/BST | CST/CDT |
|---|---|
| 12:00 AM | 6:00 PM (−1 day) |
| 6:00 AM | 12:00 AM |
| 8:00 AM | 2:00 AM |
| 9:00 AM | 3:00 AM |
| 10:00 AM | 4:00 AM |
| 12:00 PM | 6:00 AM |
| 2:00 PM | 8:00 AM |
| 3:00 PM | 9:00 AM |
| 5:00 PM | 11:00 AM |
| 6:00 PM | 12:00 PM |
| 8:00 PM | 2:00 PM |
| 10:00 PM | 4:00 PM |
Scheduling between GMT and CST
The working-day overlap is a few hours: morning in the zone that's behind matches afternoon in the zone that's ahead. For example, 9 AM GMT is 3:00 AM CST. Always write the city alongside the abbreviation in invites — several abbreviations (CST, IST, AST) are used by more than one region.
Related conversions
CST to EST · EST to CST · PST to CST · CST to PST · UTC to CST · CST to UTC · GMT to EST · EST to GMT · GMT to PST · PST to GMT · all zones