law: Factories Act, 1948 
  57. Night shifts 
  Where a worker in a factory works on a shift which extends
  
  beyond midnight,- 
  (a) for the purposes of sections 52 and 53, a holiday for a
  
  whole day shall mean in his case a period of twenty-four consecutive hours
  
  beginning when his shift ends;
  (b) the following day for him shall be deemed to be the period
  
  of twenty-four hours beginning when such shift ends, and the hours he has
  
  worked after midnight shall be counted in the previous day.