(a) In addition to all actions concerning a juvenile offender commenced on or after January 1, 2007, this code also applies to proceedings commenced before January 1, 2007, unless the court finds that application of a particular provision of the code would substantially interfere with the effective conduct of judicial proceedings or prejudice the rights of a party, in which case the particular provision of this code does not apply and the previous code applies.
(b) If a right is acquired, extinguished or barred upon the expiration of a prescribed period that has commenced to run under any other statute before January 1, 2007, that statute continues to apply to the right, even if it has been repealed or superceded.