GMT to CLT Time Converter
CLT is 4 hours behind GMT. The UK and Ireland are currently on BST (UTC+1:00), and Chile is currently on UTC-3:00.
Best Time to Call Between GMT and CLT
Both zones are inside normal business hours between 1:00 PM and 5:00 PM GMT — that's 9:00 AM to 1:00 PM CLT. That's a 4-hour window.
both at work GMT only CLT only neither — hours along the strip are GMT.
Common Times Converted
GMT on the left, CLT on the right.
GMT to CLT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| GMT | CLT | Working hours |
|---|---|---|
| 12:00 AM | 8:00 PM prev day | — |
| 1:00 AM | 9:00 PM prev day | — |
| 2:00 AM | 10:00 PM prev day | — |
| 3:00 AM | 11:00 PM prev day | — |
| 4:00 AM | 12:00 AM | — |
| 5:00 AM | 1:00 AM | — |
| 6:00 AM | 2:00 AM | — |
| 7:00 AM | 3:00 AM | — |
| 8:00 AM | 4:00 AM | — |
| 9:00 AM | 5:00 AM | GMT only |
| 10:00 AM | 6:00 AM | GMT only |
| 11:00 AM | 7:00 AM | GMT only |
| 12:00 PM | 8:00 AM | GMT only |
| 1:00 PM | 9:00 AM | Both zones |
| 2:00 PM | 10:00 AM | Both zones |
| 3:00 PM | 11:00 AM | Both zones |
| 4:00 PM | 12:00 PM | Both zones |
| 5:00 PM | 1:00 PM | CLT only |
| 6:00 PM | 2:00 PM | CLT only |
| 7:00 PM | 3:00 PM | CLT only |
| 8:00 PM | 4:00 PM | CLT only |
| 9:00 PM | 5:00 PM | — |
| 10:00 PM | 6:00 PM | — |
| 11:00 PM | 7:00 PM | — |
What GMT and CLT Actually Are
GMT — Greenwich Mean Time
The UK and Ireland in winter, plus Iceland, Portugal and much of West Africa. Standing at UTC as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, October 25, 2026, to GMT. Often used loosely as a synonym for UTC. They differ by less than a second, so for scheduling they are interchangeable.
Britain ran an experiment from 1968 to 1971 on permanent UTC+1, abandoning GMT entirely. It was scrapped after complaints about dark winter mornings in Scotland.
CLT — Chile Standard Time
Santiago, Valparaíso, Concepción. Standing at UTC-4:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Saturday, April 3, 2027, to -04. Chile still changes its clocks, moving to CLST (UTC-3) for the southern summer.
Chile is one of very few countries still moving its clocks, and the Magallanes region in the far south stays on UTC-3 permanently while the rest of the country switches.
What This Means in Practice
Both sides change clocks, on different dates
Both regions observe daylight saving but do not switch on the same day, so for a week or two each spring and fall the gap between them is an hour different from the rest of the year. Those short windows are where recurring invitations quietly break.
Major Cities in Each Zone
Cities on GMT
Cities on CLT
Frequently Asked Questions
What is the time difference between GMT and CLT?
CLT is 4 hours behind GMT.
What is 9:00 AM GMT in CLT?
9:00 AM GMT is 5:00 AM CLT.
What are the best hours to schedule a call between GMT and CLT?
Between 1:00 PM and 5:00 PM GMT, which is 9:00 AM to 1:00 PM CLT. Both sides are inside normal business hours through that window.
Does the difference between GMT and CLT change during the year?
Yes. Both regions observe daylight saving, and they do not switch on the same dates, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, October 25, 2026.
Does GMT always mean Greenwich Mean Time?
Often used loosely as a synonym for UTC. They differ by less than a second, so for scheduling they are interchangeable.
Does CLT always mean Chile Standard Time?
Chile still changes its clocks, moving to CLST (UTC-3) for the southern summer.