law: 1[32. Night shift.-
  Where a person employed in a mine works on a shift which extends beyond midnight-
  (a) for the purposes of sections 28 and 29, a weekly day of rest 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.]