Convert Central Time to Greenwich Mean Time
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CST · UTC−6 → GMT · UTC+0
CST is 6 hours behind GMT
Chicago · CDT
Wednesday, 7 October 2026
London · BST
Wednesday, 7 October 2026
When are both sides at work?Each column is one hour of the day in the first city; the second row shows the same moment in the other city. Gold means office hours (09:00–18:00), dusk means awake but off work, night means asleep (23:00–07:00). Columns where both rows are gold are good meeting times.
Shared working hours: 09:00–12:00 in Chicago is 15:00–18:00 in London.
Working (09–18) Awake, off the clock Asleep (23–07)
Pick a time and share it
06:27 Wed 7 Oct Chicago = 12:27 Wed 7 Oct London
Hour-by-hour conversion
| Chicago (CST)Every hour of today in the first city, with the matching time in the second. “Next day” means the calendar date is already tomorrow there. The highlighted row is right now. | London (GMT) | |
|---|---|---|
| 00:00 | 06:00 | |
| 01:00 | 07:00 | |
| 02:00 | 08:00 | |
| 03:00 | 09:00 | |
| 04:00 | 10:00 | |
| 05:00 | 11:00 | |
| 06:00 | 12:00 | Now |
| 07:00 | 13:00 | |
| 08:00 | 14:00 | |
| 09:00 | 15:00 | Both at work |
| 10:00 | 16:00 | Both at work |
| 11:00 | 17:00 | Both at work |
| 12:00 | 18:00 | |
| 13:00 | 19:00 | |
| 14:00 | 20:00 | |
| 15:00 | 21:00 | |
| 16:00 | 22:00 | |
| 17:00 | 23:00 | |
| 18:00 | 00:00next day | |
| 19:00 | 01:00next day | |
| 20:00 | 02:00next day | |
| 21:00 | 03:00next day | |
| 22:00 | 04:00next day | |
| 23:00 | 05:00next day |
About this conversion
CST here means Central Time, represented by Chicago (America/Chicago), currently UTC−5. GMT means Greenwich Mean Time, represented by London (Europe/London), currently UTC+1.
CST is used by 15 zones, including United States. If you meant a different one, see every meaning of CST.
GMT is used by 22 zones, including United Kingdom. See every meaning of GMT.
Working hours are shown as 09:00–18:00 local, and sleeping hours as 23:00–07:00. The hour table is anchored on the current day in Chicago; day boundaries are marked where the date differs.
Quick answers
- 09:00 CST is 15:00 GMT
- 12:00 CST is 18:00 GMT
- 15:00 CST is 21:00 GMT
- 18:00 CST is 00:00 GMT
Related conversions
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- Cape Verde Time to Greenwich Mean TimeCVT → GMT
- Davis Time to Greenwich Mean TimeDAVT → GMT
- Fiji Time to Greenwich Mean TimeFJT → GMT
- Greenwich Mean Time to Line Islands TimeGMT → LINT
- Central Time to India TimeCST → IST
- Greenwich Mean Time to India TimeGMT → IST
- Time in Chicagonow, DST, offset
- Time in Londonnow, DST, offset