Kitab-i dedem Korkut, or The Book of Dede Korkut, is the only medieval epic of the Turkic people that has come down to us in a written form. The stories that comprise The Book of Dede Korkut display a clear connection with both the common Turkic literary and folk tradition and more recent strata. Most vividly in this epic appears the idea of “the age of the Oghuz” – the time when, on the one hand, the action of the legends of the epic appears as a whole, and on the other – this time is characterized as a kind of “idyllic”. Most likely, the idea of “the age of the Oghuz” dates back to the traditional epic specific to the Turkic and Mongolian oral and written epics, traditionally referring to cosmogony, “prehistoric”, the initial state of the world. The concept of “the age of the Oghuz” in “Kitab-i dedem Korkut” also correlates in spatial relation to the idea of “the land of the Oghuz”, opposed to the hostile world of the infidels. The traditional way of nomadic life and the change of seasons is practically not reflected in the epic. The action of the stories takes place “on the green meadows”, in the steppes, probably during the summer; winter is mentioned in the epic several times. But at the same time the idea of the juxtaposition of winter and summer in “Kitab-i dedem Korkut” can be the echo of the “Dispute of Summer and Winter” reflected in the Turkic literature tradition of the 11th century. Differentiation by time of a day is the most clearly expressed in the epic. The morning time is the time when the Oghuz heroes go to the war campaigns, or exploits, the time, when important decisions are made. Thus, “Kitab-i dedem Korkut” reflected the ideas of time that existed among the Oghuz Turks for a long period during their migration to the West through the Transcaucasia, Iran and Asia Minor and the cyclization of the legends of this book epic.