law: Code of Criminal Procedure Act, 1973
  469.Commencement of the period of limitation.-
  (1) The period of limitation, in relation to an offender, shall
  
  commence, -
  (a) on the date of the offence; or
  (b) where the commission of the offence was
  
  not known to the person aggrieved by the offence or to any police officer, the
  
  first day on which such offence comes to the knowledge of such person or to any
  
  police officer, whichever is earlier; or
  (c) where it is not known by whom the offence
  
  was committed, the first day on which the identity of the offender is known to
  
  the person aggrieved by the offence or to the police officer making
  
  investigation into the offence, whichever is earlier.
  (2) In computing the said period, the day from which such period
  
  is to be computed shall be excluded.