Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between gmt and cet?
Greenwich Mean Time (gmt) is UTC+1 and Central European Time (cet) is UTC+2. The difference between them is 1 hours.
Where is gmt used?
Greenwich Mean Time (gmt) is used in United Kingdom and surrounding regions. The IANA timezone identifier is Europe/London.
Where is cet used?
Central European Time (cet) is used in France and surrounding regions. The IANA timezone identifier is Europe/Paris.
How do I convert gmt to cet?
Use the interactive converter above. Drag the time slider to any gmt time and the cet equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
GMT (London) is 1 hour behind CET (Paris). Midday in GMT (London) lines up with 13:00 in CET (Paris).
GMT (London) is in the Europe/London timezone. CET (Paris) is in Europe/Paris. The difference is 1 hour.
Daily overlap window
There is a 7-hour window each day where both GMT (London) and CET (Paris) are within standard business hours (09:00–17:00).
00:0006:0012:0018:0024:00
GMT (London)
CET (Paris)
Overlap (7h)
When to schedule across time zones
Both GMT (London) and CET (Paris) are in standard hours simultaneously for 7h per day. 3 recommended slots shown below.
09:00 London / 10:00 Paris✓ Both working
10:00 London / 11:00 Paris✓ Both working
11:00 London / 12:00 Paris✓ Both working
Based on standard 09:00–17:00 working hours in each location's local time.
Upcoming public holidays
⚡ Watch out — upcoming holidays on both sides. Verify availability in advance.
GMT (London)6 holidays
Jul 13Battle of the Boyne
Aug 3Summer Bank Holiday
Aug 31Summer Bank Holiday
Nov 30Saint Andrew's Day
Dec 25Christmas Day
CET (Paris)5 holidays
Jul 14Bastille Day
Aug 15Assumption Day
Nov 1All Saints' Day
Nov 11Armistice Day
Dec 25Christmas Day
How to work with GMT (London) and CET (Paris) time zones
Working across GMT (London) (United Kingdom) and CET (Paris) (France) involves a 1-hour gap. The good news: there is a 7-hour mutual window in standard business hours that lets both sides collaborate without anyone joining at an unreasonable hour.
💡 How to schedule across these time zones
✅
09:00–10:00 in GMT (London) = 10:00–11:00 in CET (Paris). Both sides are in standard business hours during this window.
✅
10:00–11:00 in GMT (London) = 11:00–12:00 in CET (Paris). Both sides are in standard business hours during this window.
✅
11:00–12:00 in GMT (London) = 12:00–13:00 in CET (Paris). Both sides are in standard business hours during this window.
DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.
Use the time slider above to find the exact equivalent time for any moment in GMT (London). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.
