GMT to CET
London to Paris.
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All date & timeQuestions
What time is CET when it is 12:00 GMT?
13:00. Central European Time is 1 hour ahead of Greenwich Mean Time, all year round. A 9-to-5 day in London overlaps a 9-to-5 day in Paris for 7 hours, between 09:00 and 16:00 GMT.
Is the difference between GMT and CET the same all year?
Yes. Central European Time is 1 hour ahead of Greenwich Mean 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 GMT and CET actually stand for?
GMT is Greenwich Mean Time, the zone covering London, currently UTC+0 in January. CET is Central European Time, covering Paris, at UTC+1. 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.
Anything worth knowing about Central European Time?
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.
When is a good time to call between London and Paris?
A 9-to-5 day in London overlaps a 9-to-5 day in Paris for 7 hours, between 09:00 and 16:00 GMT. 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 gmt → cet
The difference, and whether you can rely on it
In January, Central European Time is 1 hour ahead of Greenwich Mean Time — UTC+0 against UTC+1. 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 London overlaps one in Paris between 09:00 and 16:00 GMT — 7 hours. Anything outside that asks somebody to start early or finish late.
Reading the abbreviations literally will mislead you
GMT strictly means one fixed offset, but almost nobody uses it that way. People write it to mean the time in London, 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.
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. 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.
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.