GENERAL PART
TITLE TWELVE
APPLICABILITY OF CRIMINAL LEGISLATIONOF MONTENEGRO
Inclusion of Time of Detention and Punishment Served Abroad
Article 139
Detention, any other deprivation of liberty in relation to a criminal offence, deprivation of liberty during an extradition procedure, as well as the punishment served by a perpetrator under a judgment of a foreign court, shall be included in the term of punishment imposed by a national court for the same criminal offence; and where punishments are not of the same kind, such calculation shall be subject to court assessment.
Reduction of national sentence following pre-trial detention - national proceedings
EDIT.