About two models of modern chronology. To the problem of history chronology

The problem of the dispute, arising at the turn of the centuries — when a new century or millennium comes — is viewed in the article from mathematical point. Controversy about starting chronology points is related to Anno Domini chronology invention. The fact that some researchers took "zero" year as a starting point and others — the first year, resulted in occurrence of the dispute about the correct choice of modern chronology. Authors deem that the first group of researchers use continuous model of chronology, and the other — discreet one. Continuous as well as discreet models are used in modern life in different field of activity.