Unless otherwise specified by agreement, in undertakings, establishments, workshops, departments or teams where an arrangement of working time applies under the conditions laid down in article L. 3121-44, or in article D. 3121-27, the notice shall indicate the number of weeks comprising the reference period set by the agreement or decree and, for each week included in this reference period, the working hours and the breakdown of working hours.
Changes to working hours or hours of work shall be posted within the seven-day period provided for in Article L. 3121-47 or within the period provided for in the collective labour agreement referred to in Article L. 3121-44.