World Book Day/World Book Days/International Day of the Book = Dia Mundial do Livro
World Book and Copyright Day = Dia Mundial do Livro e do Direito to Autor
World Book Day or World Book and Copyright Day (also known as International Day of the Book or World Book Days) is a yearly event on April 23rd, organized by the United Nations Educational, Scientific and Cultural Organization (UNESCO), to promote reading, publishing and copyright. In the United Kingdom, the day is recognized on the first Thursday in March. World Book Day was celebrated for the first time on 23 April 1995.