CET to GMT
Paris to London.
- Nothing leaves your browser
- Free, no sign-up
Related tools
All date & timeQuestions
What time is GMT when it is 12:00 CET?
11:00. Greenwich Mean Time is 1 hour behind Central European Time, all year round. A 9-to-5 day in Paris overlaps a 9-to-5 day in London for 7 hours, between 10:00 and 17:00 CET.
Is the difference between CET and GMT the same all year?
Yes. Greenwich Mean Time is 1 hour behind Central European Time, all year round. Both zones change their clocks, and close enough to the same dates that the gap between them holds — apart from a week or two each spring and autumn when one has shifted and the other has not.
What do CET and GMT actually stand for?
CET is Central European Time, the zone covering Paris, currently UTC+1 in January. GMT is Greenwich Mean Time, covering London, at UTC+0. One zone covers most of the continent — Paris, Berlin, Madrid, Rome, Warsaw and Stockholm all read the same clock, despite Madrid sitting almost as far west as London. Spain's clocks were moved to match Berlin in 1940 and never moved back.
Anything worth knowing about Greenwich Mean Time?
GMT and UK time are the same thing only in winter. From late March to late October London runs on British Summer Time, an hour ahead of GMT, so a meeting booked as 'GMT' with someone in London is an hour out for most of the year.
When is a good time to call between Paris and London?
A 9-to-5 day in Paris overlaps a 9-to-5 day in London for 7 hours, between 10:00 and 17:00 CET. If the call has to happen outside that, the fairer arrangement is usually to alternate which side takes the awkward hour rather than always asking the same one.
How it works, and more about cet → gmt
The difference, and whether you can rely on it
In January, Greenwich Mean Time is 1 hour behind Central European Time — UTC+1 against UTC+0. It stays that way all year, so the number is worth memorising if you work across these two often.
When you can both be at a desk
A standard working day in Paris overlaps one in London between 10:00 and 17:00 CET — 7 hours. Anything outside that asks somebody to start early or finish late.
Reading the abbreviations literally will mislead you
CET strictly means one fixed offset, but almost nobody uses it that way. People write it to mean the time in Paris, which shifts if that city observes daylight saving — and it does. This page follows the common usage rather than the strict one, because the strict reading gives an answer that is wrong for a good part of the year.
One zone covers most of the continent — Paris, Berlin, Madrid, Rome, Warsaw and Stockholm all read the same clock, despite Madrid sitting almost as far west as London. Spain's clocks were moved to match Berlin in 1940 and never moved back. GMT and UK time are the same thing only in winter. From late March to late October London runs on British Summer Time, an hour ahead of GMT, so a meeting booked as 'GMT' with someone in London is an hour out for most of the year.
Scheduling something recurring
For a one-off, the converter above is the whole job. For a standing meeting across zones it is worth putting the invitation in a calendar that stores the zone rather than the time — then the changeover is handled for you and nobody has to remember. If you are trying to find a slot across more than two places at once, the meeting planner shows a whole day at a glance instead.