CST to GMT Time Zone Converter
This converts US Central Time (CST, or CDT in summer — locals say CT) into London time, shown as GMT in winter and BST in summer. London sits about 6 hours ahead of Central Time for most of the year. The converter handles the daylight-saving switches on both sides, so you always get the right hour for the date you pick.
Enter a date and time to convert.
Daylight saving is applied automatically for the date you pick. Labels like PST/EST name the zone (Pacific/Eastern); the real abbreviation shifts to PDT/EDT during daylight saving, and gmt here means London (GMT in winter, BST in summer) while utc stays fixed.
The time difference
London runs ahead of US Central Time by 6 hours for most of the year — the same gap in winter and in summer, because both places shift their clocks by an hour. The catch is timing: the US springs forward on March 8, 2026, but London not until March 29; the US falls back on November 1, but London on October 25. During those late-March and late-October windows the two haven't both switched yet, so the gap is briefly an hour off.
A worked example
Take 9:00 AM Central Time.
- Winter (Jan 15, 2026): 9:00 AM CST becomes 3:00 PM in London the same day.
- Summer (Jul 15, 2026): 9:00 AM CDT becomes 3:00 PM in London the same day.
Same result both times, because at those dates both clocks are settled into their season.
Daylight saving & the abbreviation caveat
The slug says "CST," but from spring to fall Central Time is on CDT — people in Chicago, Dallas, and Houston just say "CT." London, meanwhile, flips between GMT and BST. Because the US and UK change on different dates, the gap wobbles for about two weeks each spring and fall. The converter picks the correct offset for your exact date, so a briefly unusual gap in those windows is right, not a bug.
When you'll use it
Handy for scheduling calls with a London office, catching a Premier League kickoff or a BBC broadcast, timing a flight arrival, or coordinating work with UK-based teammates and clients.
Frequently asked questions
How many hours ahead is London than Central Time?
Usually 6 hours. London is 6 hours ahead of US Central Time for most of the year, because both regions observe daylight saving and their clocks stay in step outside a couple of short transition windows.
Why does the gap sometimes look off by an hour?
The US and Europe start and end daylight saving on different dates. For roughly two weeks in late March and late October 2026, one side has switched and the other hasn't, so the usual 6-hour gap is briefly 5 or 7.
What's the difference between GMT and BST?
GMT is London's winter time; BST (British Summer Time) is its summer time, one hour ahead. London shows GMT from late October to late March and BST the rest of the year.