law: Code of Criminal Procedure Act, 1973
  418.Execution of sentence of imprisonment.-
  (1) Where the accused is sentenced to
  
  imprisonment for life or to imprisonment for a term in cases other than those
  
  provided for by section 413, the Court passing the sentence shall forthwith
  
  forward a warrant to the jail or other place in which he is, or is to be,
  
  confined, and, unless the accused is already confined in such jail or other
  
  place, shall forward him to such jail or other place, with the warrant:
  
  Provided that where the accused is sentenced to imprisonment till the
  
  rising of the Court, it shall not be necessary to prepare or forward a warrant
  
  to a jail, and the accused may be confined in such place as the Court may
  
  direct.
  (2) Where the accused is not present in Court when he is sentenced to such
  
  imprisonment as is mentioned in sub-section (1), the Court shall issue a warrant
  
  for his arrest for the purpose of forwarding him to the jail or other place in
  
  which he is to be confined; and in such case, the sentence shall commence on
  
  the date of his arrest.