(1) For this Act, a "detention period", for an offender, is each period during the periodic detention period of the offender's sentence of imprisonment that—
(a) starts at the reporting time on the reporting day; and
(b) ends at the finishing time on the 2nd day after the reporting day.
(2) However, a period mentioned in subsection (1) is not a detention period if it includes any part of—
(a) Christmas Day, Good Friday or Easter Sunday; or
(b)
another day prescribed by regulation.