Convert UK time (GMT/BST) to Central Time (CST/CDT), with daylight saving applied for the exact date you pick.
Tue, Oct 27
Tue, Oct 27 Same day
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|
GMT 9 to 5 CDT 9 to 5
CDT is 5 hours behind GMT.
The same conversion works for every city on these clocks, such as London to Chicago, London to Texas and England to Chicago.
Shaded areas follow the official zone boundaries, so a country split across zones is split here too. Hover or tap a region for its local time.
Every hour of Tuesday, October 27, 2026, side by side. Days with a clock change show 23 or 25 rows.
Shaded rows fall inside working hours in both places.
| London (GMT) | Chicago (CDT) | Working hours |
|---|---|---|
| 12:00 AM | 7:00 PM previous day | |
| 1:00 AM | 8:00 PM previous day | |
| 2:00 AM | 9:00 PM previous day | |
| 3:00 AM | 10:00 PM previous day | |
| 4:00 AM | 11:00 PM previous day | |
| 5:00 AM | 12:00 AM | |
| 6:00 AM | 1:00 AM | |
| 7:00 AM | 2:00 AM | |
| 8:00 AM | 3:00 AM | |
| 9:00 AM | 4:00 AM | |
| 10:00 AM | 5:00 AM | |
| 11:00 AM | 6:00 AM | |
| 12:00 PM | 7:00 AM | |
| 1:00 PM | 8:00 AM | |
| 2:00 PM | 9:00 AM | Both working |
| 3:00 PM | 10:00 AM | Both working |
| 4:00 PM | 11:00 AM | Both working |
| 5:00 PM | 12:00 PM | |
| 6:00 PM | 1:00 PM | |
| 7:00 PM | 2:00 PM | |
| 8:00 PM | 3:00 PM | |
| 9:00 PM | 4:00 PM | |
| 10:00 PM | 5:00 PM | |
| 11:00 PM | 6:00 PM |
Every hour of the UK time day, plus the common half hours, and their CST equivalents. The second column covers the part of the year when the clocks are on a different gap.
| UK time | CDT or CST 6 h behind, most of the year (337 days in 2026) | CDT 5 h behind, about 4 weeks in 2026 |
|---|---|---|
| 12:00 AM | 6:00 PM (previous day) | 7:00 PM (previous day) |
| 1:00 AM | 7:00 PM (previous day) | 8:00 PM (previous day) |
| 2:00 AM | 8:00 PM (previous day) | 9:00 PM (previous day) |
| 3:00 AM | 9:00 PM (previous day) | 10:00 PM (previous day) |
| 4:00 AM | 10:00 PM (previous day) | 11:00 PM (previous day) |
| 5:00 AM | 11:00 PM (previous day) | 12:00 AM |
| 6:00 AM | 12:00 AM | 1:00 AM |
| 7:00 AM | 1:00 AM | 2:00 AM |
| 8:00 AM | 2:00 AM | 3:00 AM |
| 9:00 AM | 3:00 AM | 4:00 AM |
| 9:30 AM | 3:30 AM | 4:30 AM |
| 10:00 AM | 4:00 AM | 5:00 AM |
| 10:30 AM | 4:30 AM | 5:30 AM |
| 11:00 AM | 5:00 AM | 6:00 AM |
| 11:30 AM | 5:30 AM | 6:30 AM |
| 12:00 PM | 6:00 AM | 7:00 AM |
| 12:30 PM | 6:30 AM | 7:30 AM |
| 1:00 PM | 7:00 AM | 8:00 AM |
| 1:30 PM | 7:30 AM | 8:30 AM |
| 2:00 PM | 8:00 AM | 9:00 AM |
| 2:30 PM | 8:30 AM | 9:30 AM |
| 3:00 PM | 9:00 AM | 10:00 AM |
| 3:30 PM | 9:30 AM | 10:30 AM |
| 4:00 PM | 10:00 AM | 11:00 AM |
| 4:30 PM | 10:30 AM | 11:30 AM |
| 5:00 PM | 11:00 AM | 12:00 PM |
| 5:30 PM | 11:30 AM | 12:30 PM |
| 6:00 PM | 12:00 PM | 1:00 PM |
| 7:00 PM | 1:00 PM | 2:00 PM |
| 8:00 PM | 2:00 PM | 3:00 PM |
| 9:00 PM | 3:00 PM | 4:00 PM |
| 10:00 PM | 4:00 PM | 5:00 PM |
| 11:00 PM | 5:00 PM | 6:00 PM |
Each row is a stretch of days with one constant difference, split at every clock change.
| Dates | UK time | CST | Difference |
|---|---|---|---|
| Thu, Jan 1, 2026 until Sun, Mar 8, 2026 | GMT | CST | CST 6 h behind |
| Sun, Mar 8, 2026 until Sun, Mar 29, 2026 | GMT | CDT | CDT 5 h behind |
| Sun, Mar 29, 2026 until Sun, Oct 25, 2026 | BST | CDT | CDT 6 h behind |
| Sun, Oct 25, 2026 until Sun, Nov 1, 2026 | GMT | CDT | CDT 5 h behind |
| Sun, Nov 1, 2026 until Sun, Mar 14, 2027 | GMT | CST | CST 6 h behind |
| Sun, Mar 14, 2027 until Sun, Mar 28, 2027 | GMT | CDT | CDT 5 h behind |
| Sun, Mar 28, 2027 until Sun, Oct 31, 2027 | BST | CDT | CDT 6 h behind |
| Sun, Oct 31, 2027 until Sun, Nov 7, 2027 | GMT | CDT | CDT 5 h behind |
| Sun, Nov 7, 2027 until Sat, Jan 1, 2028 | GMT | CST | CST 6 h behind |
UK time is Greenwich Mean Time (GMT, UTC+0) in winter and British Summer Time (BST, UTC+1) from the last Sunday in March to the last Sunday in October.
Central Time follows the clock in Chicago: Central Standard Time (CST, UTC−6) in winter and Central Daylight Time (CDT, UTC−5) during US daylight saving time.
CST is also used for China Standard Time (UTC+8) and Cuba Standard Time. Here CST means US Central Time (America/Chicago).
CDT is 6 hours behind BST for most of the year (210 days in 2026). The gap is 5 hours for about 4 weeks in 2026.
Chicago uses Central Time. CDT is 6 hours behind BST for most of the year (210 days in 2026). The gap is 5 hours for about 4 weeks in 2026. Type any UK time time into the UK time to CST converter to see the Chicago time for any date.
9:00 AM BST or GMT is 3:00 AM CDT or CST for most of the year (337 days in 2026). 9:00 AM GMT is 4:00 AM CDT for about 4 weeks in 2026.
12:00 PM BST or GMT is 6:00 AM CDT or CST for most of the year (337 days in 2026). 12:00 PM GMT is 7:00 AM CDT for about 4 weeks in 2026.
10:00 AM BST or GMT is 4:00 AM CDT or CST for most of the year (337 days in 2026). 10:00 AM GMT is 5:00 AM CDT for about 4 weeks in 2026.
5:00 PM BST or GMT is 11:00 AM CDT or CST for most of the year (337 days in 2026). 5:00 PM GMT is 12:00 PM CDT for about 4 weeks in 2026.
No, CST is behind UK time. CDT is 6 hours behind BST for most of the year (210 days in 2026). The gap is 5 hours for about 4 weeks in 2026.
Working days of 9 AM to 5 PM overlap from 3:00 PM to 5:00 PM BST, which is 9:00 AM to 11:00 AM CDT while BST and CDT apply.
Both zones change their clocks, on their own dates, so the gap can shift during the year. The next change is on Sunday, November 1, 2026 in Central Time.
CST is also used for China Standard Time (UTC+8) and Cuba Standard Time. Here CST means US Central Time (America/Chicago).