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.