Hemdat Yamim is a book dealing with Jewish customs and laws (particularly of Jewish holidays), including many musar exhortations. It is based on kabbalah in general, and the kabbalah of the Ari in particular. The book was first published by Israel Yaakov Algazi in Izmir in about 1731. The question of the authorship and nature of the book - whether early or late, whether or not the author was a Sabbatean - were once in dispute, and as a result also the attitude towards customs recorded in the book.