So, it happens when the individual appears in court. Usually, in the legal system, the rule is at the time of release, except as set out by section 515. The justice is the one who will have to indicate the reason he or she wants to make use of an exception authorizing a sentence credit ratio of 1.5. Therefore, it is the justice who will keep those statistics.
On June 1st, 2009. See this statement in context.