With respect to a worker whom an employer, at the time this Act comes into effect, is to have work under the provisions of Article 32, paragraph (2) of the Labor Standards Act prior to amendment by this Act (hereinafter referred to as the "former Act"), with regard to working hours for the period that includes March 31, 1988 among the fixed periods of not more than four weeks provided for in the rules of employment or other equivalent instrument based on the provisions of that paragraph, the provisions then in force continue to govern, notwithstanding the provisions of Article 32, Article 32-2, Article 33, Article 36, Article 37, Article 64-2 and Article 66, paragraph (2) of the new Act.