GENERAL PART
CHAPTER TWO
APPLICATION OF CRIMINAL LEGISLATION OF THE REPUBLIC OF SERBIA
Calculating Detention and Time Served Abroad
Article 11
Detention, any other depriving of liberty in respect of a criminal offence, depriving of liberty during extradition procedure, as well as the punishment that the offender has served abroad pursuant to the judgement of a foreign court shall be calculated in the punishment imposed by a domestic court for the same criminal offence, and if the punishment is not of the same kind, calculation shall be done according to the assessment of the court.
Reduction of national sentence following pre-trial detention - national proceedings
EDIT.