CST to GMT converter
GMT time is 5 hours ahead of Central time in summer and 6 hours ahead of it in winter.
Right now it's in Chicago (CT) and in Greenwich (GMT).
How to convert
To convert CT to GMT, add 5 hours while the US is on daylight saving time (March to early November) and add 6 hours the rest of the year.
GMT never changes. The UK uses GMT only in winter; in summer it switches to BST (UTC+1). For UK time, use time in London.
Hourly chart
| Central (CT) | GMT, summer | GMT, winter |
|---|---|---|
| 12:00 AM CT | 5:00 AM GMT | 6:00 AM GMT |
| 1:00 AM CT | 6:00 AM GMT | 7:00 AM GMT |
| 2:00 AM CT | 7:00 AM GMT | 8:00 AM GMT |
| 3:00 AM CT | 8:00 AM GMT | 9:00 AM GMT |
| 4:00 AM CT | 9:00 AM GMT | 10:00 AM GMT |
| 5:00 AM CT | 10:00 AM GMT | 11:00 AM GMT |
| 6:00 AM CT | 11:00 AM GMT | 12:00 PM GMT |
| 7:00 AM CT | 12:00 PM GMT | 1:00 PM GMT |
| 8:00 AM CT | 1:00 PM GMT | 2:00 PM GMT |
| 9:00 AM CT | 2:00 PM GMT | 3:00 PM GMT |
| 10:00 AM CT | 3:00 PM GMT | 4:00 PM GMT |
| 11:00 AM CT | 4:00 PM GMT | 5:00 PM GMT |
| 12:00 PM CT | 5:00 PM GMT | 6:00 PM GMT |
| 1:00 PM CT | 6:00 PM GMT | 7:00 PM GMT |
| 2:00 PM CT | 7:00 PM GMT | 8:00 PM GMT |
| 3:00 PM CT | 8:00 PM GMT | 9:00 PM GMT |
| 4:00 PM CT | 9:00 PM GMT | 10:00 PM GMT |
| 5:00 PM CT | 10:00 PM GMT | 11:00 PM GMT |
| 6:00 PM CT | 11:00 PM GMT | 12:00 AM (next day) GMT |
| 7:00 PM CT | 12:00 AM (next day) GMT | 1:00 AM (next day) GMT |
| 8:00 PM CT | 1:00 AM (next day) GMT | 2:00 AM (next day) GMT |
| 9:00 PM CT | 2:00 AM (next day) GMT | 3:00 AM (next day) GMT |
| 10:00 PM CT | 3:00 AM (next day) GMT | 4:00 AM (next day) GMT |
| 11:00 PM CT | 4:00 AM (next day) GMT | 5:00 AM (next day) GMT |
US daylight saving time: March 14 to November 7, 2027.
Questions people ask
Is GMT ahead of CST?
GMT time is 5 hours ahead of Central time in summer and 6 hours ahead of it in winter. The converter above uses the right offset for any date.
What is GMT right now?
See the live clocks at the top of this page. They show the current time in Chicago and Greenwich, corrected by an internet time check.
People say CST all year. Is that right?
In everyday use, "CST" usually just means Central time. Strictly, CST is the winter name and the summer name ends in DT. This page converts Central time for the date you pick.
More conversions
See also: time zone converter · meeting planner · US time zones