C'est en anglais; je dois ecrire en anglais ces dates: Lundi 1 septembre. Mardi 15 decembre. Jeudi 11 janvier. vendredi 5 avril.

Monday, first of September  ( monday, september 1st ) 
Tuesday, fifteenth of December ( tuesday, deccember 15th)
Thursday, eleventh of January ( thursday, january 11th ) 
Friday, fifth of April ( friday, april 5th )

Lundi 1 septembre.: September the first
Mardi 15 decembre.: Tuesday the 15th of December
Jeudi 11 janvier : Thursday the 11th of January
vendredi 5 avril. : Friday the 5th of April