(1) For this Act, an offender's reporting day for a detention period is—
(a) the day of the week stated by the sentencing court for the offender's first detention period to start; or
(b) if another day is fixed under subsection (2)—that day.
(2) The chief executive may, by written notice given to the offender, fix a reporting day for the offender that is different to the day of the week stated by the sentencing court for the offender's first detention period to start.
(3) If the chief executive fixes a different reporting day under subsection (2), the offender's periodic detention period is automatically amended so that the number of detention periods for the offender for the periodic detention period of the offender's sentence of imprisonment remains unchanged.
(4) A notice under subsection (2) takes effect—
(a) when it is given to the offender; or
(b) if a later date of effect is stated in the notice—on the date stated.
(5) The notice must tell the offender when the periodic detention period ends because of the changed reporting day.