This paper explores the role and meaning of the consecration of days in the Catholic Church. The research was done in such a way that we first studied how the concept of consecration of the day came about in the first place. What influenced such religious behavior? Devotion has been learned from the foundations of its existence, from the first religions until today. Inevitably, dedication stems from human fear of the unknown. Pagan religions sacrificed their first-born to appease the gods and provide them with prosperity and peace. The Christian consecration of time is tied to that same history. During the Christianization of pagans, Christians necessarily Christianized their customs as well. When adopting other people's customs, there is a great influence on the development of Christian prayer and customs. So we meet holidays that are equivalent to some pagan holidays. And we find in mountain areas or various temples coloring with a double meaning, which were once dedicated to pagan gods, and today are dedicated to saints who are attributed similar powers. The development of the Christian consecration of the day was regulated multiple times, by various councils, documents, and decrees approved by the popes. So even today's form of consecration of the day is not eternal but is subject to changes over time.