With regard to paid leave for a worker whose base date (meaning the day following the day on which the period of continuous service prescribed in Article 39, paragraph (1) of the new Act ends; the same applies hereinafter in this Article) is a day other than April 1 at the time this Act comes into effect, the provisions then in force continue to govern until the day before the first base date after the date on which this Act comes into effect, notwithstanding the provisions of Article 39, paragraphs (1) through (3) of the new Act.