First Book
General Provisions
Section One
Preliminary Provisions
CHAPTER TWO
Applicability of the Law
PART ONE
Applicability of the Law from the point of view of place and persons
Article 20 :
The period of arrest and imprisonment that the accused or convict has spent outside Afghanistan as a result of application of punitive verdicts shall be deducted from the duration of the punishment to which the person will be sentenced for commitment of the same crime in Afghanistan or from the punishment that is being implement upon him.
Reduction of national sentence following pre-trial detention - national proceedings
EDIT.