16. (1) A detainee may make application in writing to the Director requesting the Director to make an order varying the day on which the detainee's detention period during the whole or part of the detainee's sentence is to commence.
(2) Where a detainee makes application under subsection (1), the Director may—
(a) grant the application and order that the day in respect of which the application is made be varied as requested in the application; or
(b) refuse to grant the application.