Hi xor

Yes, I think your solution does address this problem well.

And well spotted

The trouble is that this sheet might be used either in France or outside of it, and I don't want it to break when opened on a non-French PC. Any ideas on how to make the solution robust? Can I set the "Region settings" on a sheet to not change when opened on another PC? (I will post another question about this...)

Best regards
P