No person under the age of sixteen (16) years shall be employed or permitted to work in any of the occupations set out in Section 71 of this title between the hours of seven o'clock p.m. and seven o'clock a.m.; except, during the summer (June 1 through Labor Day) and, if the employer is not covered by the Fair Labor Standards Act,¹ during the remainder of the year on days followed by a nonschool day when the prohibited hours will be between the hours of nine o'clock p.m. and seven o'clock a.m.