The do's and don'ts of the days of the moon based on the text of the MAdayAn I Sih-ROzag)

In the ancient calendar, the year was based on twelve thirty-day months, each of the thirty days of the month was attributed to one of the gods and angels of  Zoroastrian religion.. There have been do’s and don’ts for doing things among Iranians, and every day has been desirable for doing something. In the Pahlavi piece called MAdayAn I Sih-ROzag , thirty days are mentioned, what is suitable and good for which day. The main question of this research is whether the belief in the misfortune of deeds is related to the selfishness of the gods who observe the days of the month and is it influenced or not? In the book of Farziyat-Nameh of Darab Pahlan’s and a piece called “Truth Days” from Azarbad Mehraspandan, the works that should be included in Each of the thirty days of the month did is listed. This research examines the thirty-day requirements of the Iranian month by means of documentary-library study. First, the Pahlavi text of MAdayAn I Sih ROzag is translated into Persian and examined linguistically, and it is matched with the Farziyat-Nameh and advice of Azarbad Mehraspandan. This research shows that the belief that things are unlucky on the days of the month has been common among Iranians and is related to the names and duties of  Gods of  thirty days of the month.