Section 90(2) of the Principal Act is amended as follows:

(a) by omitting from paragraph (d) "while the prisoner is serving his or her sentence" and substituting "while the prisoner is in custody or as an incentive to, or reward for, engaging, while the prisoner is in custody, in activities that are rehabilitative or of a kind approved by the Director" ;

(b) by inserting the following paragraph after paragraph (d) :

(da) the granting under section 87 of special management days; and