Enforcement Rules of the Labor Standards Act Article 20

In any of the following situations, an employer shall give public notice immediately:1.Reschedule regular working hours in accordance with Paragraphs 2 to 3 of Article 30 or Subparagraph 1 of Paragraph 1 of Article 30-1 of the Act.2.Extend working hours in accordance with Subparagraph 2 of Paragraph 1 of Article 30-1 or Paragraphs 1, 2 and 4 of Article 32 of the Act.3.Reschedule rest periods at the time of shift changes in accordance with Paragraph 2 of Article 34 of the Act.4.Adjust regular leaves or rest days in accordance with Paragraph 2 or 4 of Article 36 of the Act.
中文原文 勞動基準法施行細則第20條
雇主有下列情形之一者,應即公告周知:
一、依本法第三十條第二項、第三項或第三十條之一第一項第一款規定變更勞工正常工作時間。
二、依本法第三十條之一第一項第二款或第三十二條第一項、第二項、第四項規定延長勞工工作時間。
三、依本法第三十四條第二項但書規定變更勞工更換班次時之休息時間。
四、依本法第三十六條第二項或第四項規定調整勞工例假或休息日。

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