Criminal Code Warning: this is not an official translation. Under all circumstances the original text in Dutch language of the Criminal Code (Wetboek van Strafrecht) prevails

4.  In the application of subsections (1) and (2), the period of time that the convicted offender has 
served prior to the enforcement of the sentence, either in police custody, pre-trial detention or in 
detention abroad in response to an application for extradition from the Netherlands, shall be 
considered part of that term, unless under application of section 68(1, last sentence) of the Code of 
Criminal Procedure that period has already been deducted from another sentence served by the 
convicted offender. 
5.  If the convicted offender has to serve more than one custodial sentence, these sentences shall run 
consecutively, wherever possible. In that case, fully unconditional custodial sentences to be 
enforced, with the exception of default detention, shall be considered one custodial sentence to 
which this section and sections 15a to 15l inclusive shall apply. 
6.  Sections 570 and 570a of the Code of Criminal Procedure shall apply.