CROATIA CRIMINAL CODE
GENERAL PART
CHAPTER TWO (ii) – APPLICABILITY OF THE CRIMINAL LEGISLATION OF THE REPUBLIC OF CROATIA
Article 17
In the cases of the application of the criminal legislation of the Republic of Croatia, when the perpetrator has been deprived of his liberty in a foreign state due to a criminal offense, the time spent in pre-trial detention or imprisonment, or any other deprivation of liberty, shall be included in the sentence pronounced by the domestic court for the same criminal offense, and if the sentences are not of the same type, the inclusion shall be made in accordance with an equitable assessment of the court.
Reduction of national sentence following pre-trial detention - national proceedings
EDIT.