Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between cet and gmt?
Central European Time (cet) is UTC+2 and Greenwich Mean Time (gmt) is UTC+1. The difference between them is 1 hours.
Where is cet used?
Central European Time (cet) is used in France and surrounding regions. The IANA timezone identifier is Europe/Paris.
Where is gmt used?
Greenwich Mean Time (gmt) is used in United Kingdom and surrounding regions. The IANA timezone identifier is Europe/London.
How do I convert cet to gmt?
Use the interactive converter above. Drag the time slider to any cet time and the gmt equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
CET (Paris) is 1 hour ahead of GMT (London). Midday in CET (Paris) lines up with 11:00 in GMT (London).
CET (Paris) observes Europe/Paris and GMT (London) observes Europe/London — a 1 hour gap between them.
Mutual working hours
There is a 7-hour window each day where both CET (Paris) and GMT (London) are within standard business hours (09:00–17:00).
00:0006:0012:0018:0024:00
CET (Paris)
GMT (London)
Overlap (7h)
Optimal meeting slots
CET (Paris) and GMT (London) share 7 hours of business hours overlap daily. Showing the 3 most balanced slots — see the time table below for the full window.
10:00 Paris / 09:00 London✓ Both working
11:00 Paris / 10:00 London✓ Both working
12:00 Paris / 11:00 London✓ Both working
Assumes a standard 9 AM–5 PM workday in each location's local timezone.
Upcoming public holidays
⚡ Watch out — upcoming holidays on both sides. Verify availability in advance.
CET (Paris)5 holidays
Jul 14Bastille Day
Aug 15Assumption Day
Nov 1All Saints' Day
Nov 11Armistice Day
Dec 25Christmas Day
GMT (London)7 holidays
Jun 15World Cup Bank HolidaySOON
Jul 13Battle of the Boyne
Aug 3Summer Bank Holiday
Aug 31Summer Bank Holiday
Nov 30Saint Andrew's Day
How to work with CET (Paris) and GMT (London) time zones
Coordinating between CET (Paris) (France) and GMT (London) (United Kingdom) means working around a 1-hour time difference. The 7-hour overlap window gives both teams a natural slot for real-time collaboration without anyone working outside normal hours.
💡 How to schedule across these time zones
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Schedule at 10:00–11:00 (CET (Paris)) for a 09:00–10:00 slot in GMT (London) — the sweet spot where both teams are working.
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Schedule at 11:00–12:00 (CET (Paris)) for a 10:00–11:00 slot in GMT (London) — the sweet spot where both teams are working.
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Schedule at 12:00–13:00 (CET (Paris)) for a 11:00–12:00 slot in GMT (London) — the sweet spot where both teams are working.
Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.
Drag the slider at the top to convert any CET (Paris) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.
