The teaching of science is considered one of the most complex and comprehensive teaching subject during the elementary education. During the year, there are various events and dates that we celebrate, at home or at school, such as birthdays, holidays or some important dates that we all celebrate on the same day such as Statehood Day. Accordingly to this, the aim of this thesis is to investigate the prevalance of marking significant date sin textbooks, used in teaching, and the Curriculum for the subject Nature and Society. For comparison I used three different publishers with three different textbooks and the Curriculum for the subject Nature and Society. The results of the research indicate that significant dates are represented in textbooks for 1st and 2nd grade related to catholic holidays and Statehood Day, Independence Day, Bread Days, Remembrance Day for the victims of the Homeland War and Remembrence Day for the victims of Vukovar and Škabrnja. In the 4th grade, significant dates are extended to commemorations related to the participation of the Republic of Croatia in Europe. The marking of significant dates related to natural sciences is insufficiently represented. The textbooks of all three publishers contain more educational content aimed at marking significant dates than the Curriculum itself.