Add a transition to this daily timetable at the specified time having the specified code. If time is already a transition point, replace the existing code with code. Return true if the value returned by finalTransitionCode() prior to this operation is not equal to the value returned by finalTransitionCode() after this operation, and false otherwise. The behavior is undefined unless 24 > time.hour() and 0 <= code || k_UNSET_TRANSITION_CODE == code.