The issue addressed in this publication is the interpretation of the provisions on the term under Article 8 § 3 The Family and Guardianship Code in the context of the interpretation of Article 10, para. 1, point 3 of the Concordat. The conducted research shows that statutory provisions recognize the preparation of a marriage certificate as a necessary condition for contracting a marriage, and not the observance of the five-day period under Article 8 § 3 of the Family and Guardianship Code. They are consistent with the provisions of the Concordat, even despite its literal interpretation, which may suggest a different interpretation. It should be noted that the current jurisprudence and the views of most doctrines fall within the framework specified not only by the Act – the Family and Guardianship Code, but also by the provisions of the Concordat. As a consequence, the ineffective expiry of the period under Article 8 § 3 of the Family and Guardianship Code will not affect the conclusion of a concordat marriage, if a marriage certificate is drawn up (Article 1 § 2 of the Family and Guardianship Code).