The methodology of school praxis, especially as regards the constructing of encyclopaedic knowledge, is based primarily on factual and historical classification of social phenomena. In this sense, the codification of written Stur's standard Slovak is primarily treated as a current historical event that should have its specific date. The problem is that indication of date which is in school classes traditionally signed to this event (year 1843) and generations of teachers present it to the students as a historical fact is not accurate. The aim of this paper is to show opportunity to choose the date from three major events associated with the codification ambition of Stur and his fellows. The paper deals with the detailed characteristics of these events and their interpretation as regards the codification of Stur's standard Slovak.