Copyright Act Article 35

All terms of duration specified in Articles 30 through 34 terminate as of the last day of the last year of the term.Where the term of economic rights for works released to the public continuously or successively is calculated on the basis of the date of the public release of the work, if each public release can constitute an independent work, the term of economic rights of each work shall be calculated from the date of each public release; if each public release cannot constitute an independent work, the term shall be calculated from the date of the public release(s) that can constitute an independent work.With respect to the circumstances described in the preceding paragraph, if the continuing part has not been publicly released within three years of the date of public release of its preceding part, the term of the economic rights shall be calculated from the date of public release of its preceding part.
中文原文 著作權法第35條
第三十條至第三十四條所定存續期間,以該期間屆滿當年之末日為期間之終止。
繼續或逐次公開發表之著作,依公開發表日計算著作財產權存續期間時,如各次公開發表能獨立成一著作者,著作財產權存續期間自各別公開發表日起算。
如各次公開發表不能獨立成一著作者,以能獨立成一著作時之公開發表日起算。
前項情形,如繼續部分未於前次公開發表日後三年內公開發表者,其著作財產權存續期間自前次公開發表日起算。

English translation for reference only; the Chinese text prevails. Not legal advice.