Article D3121-36 of the French Labour Code
The request of an employee who has entered into a fixed number of days agreement to work reduced hours, in application ofarticle L. 3121-60-1, shall be sent to the employer by registered letter with acknowledgement of receipt. The request shall specify the desired working hours and the planned effective date for the implementation of the new conditions of the fixed number of days. It shall be sent at least two…