The author deals with the basic conceptions of the time perception in the Middle Ages and with their application in the Bohemian intellectual milieu of the High Middle Ages. The representative of that milieu is the dean of the Prague bishopric chapter Cosmas, author of the first Bohemian national chronicle.
In the Cosmas' chronicle, the profane time proceeding from the antique tradition and from Cosmas' astronomical experience pervades through the gradually asserting ecclesiastical understanding of the time, which penetrated into Cosmas' chronicle mainly via the Christian calendar.