Oath Act Article 3

Civil servants specified in the preceding article shall take an oath when assuming office.The persons specified in Subparagraph 1 of the preceding article shall take an oath on alternative dates when they fail to take an oath on designated dates.The persons specified in Subparagraphs 2 to 11 shall take an oath on alternative dates within 3 months if they start to hold the post under specific circumstances earlier than the designated date.
中文原文 宣誓條例第3條
前條公職人員應於就職時宣誓。
前條第一款人員,因故未能於規定之日宣誓就職者,應另定日期舉行宣誓。
前條第二款至第十一款人員,因特殊情形先行任事者,應於三個月內補行宣誓。

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