law: Sashastra Seema Bal Act, 2007 
  134.  Commencement of sentence of imprisonment.
  Whenever any person is sentenced by a Force Court under this Act
  
  to imprisonment, the term of his sentence shall, whether it has been revised or
  
  not, be reckoned to commence on the day on which the original proceedings were
  
  signed by the presiding officer, or in the case of a Summary Force Court, by
  
  the Court:
  Provided that if for any reason beyond the control of the
  
  commanding officer or superior officer, the sentence of imprisonment cannot be
  
  executed in full or in part, the convict shall be liable to undergo the whole
  
  or unexpired portion of sentence, as the case may be, when it becomes possible
  
  to carry out the same:
  Provided further that the period of detention or confinement, if
  
  any, undergone by an accused person during the investigation, inquiry or trial
  
  of the case in which he is sentenced and before the date of which the original
  
  proceedings were signed shall be set off against the term of his sentence and
  
  the liability of such person to undergo imprisonment shall be restricted to the
  
  remainder, if any of the term of his sentence.