The sects emerge in a certain geographical region within a certain time period. However, when they encounter different cultures and basins, they develop and differentiate by taking the place where they are. There are important time periods for each religion/ religious movements, which are symbolic. The more persistence of a sectarian societal life, the more persistence and persuasiveness it will increase. As in all other religions/religious movements, there are also time periods in Islam that give special importance to keep social consensus among the members of the people and to keep them holy up to date. Among the Islamic sects, the emphasis on holy times seems to be mostly in Shiism. The importance of sacredness to holy days and nights has been renewed and renewed in the historical process of the sect, and it has continued to be active in society as much as the day. Our work aims to explain the importance of today's days and nights, which are considered holy for one year in Iran, and therefore the Shia of Imamiya. However, the lines between them stayed and were not only the days and nights shown on the calendar leaves, but those with visible effects in Iran's religious life were preferred