Juvenile petitioner's commitment to Division of Juvenile Facilities (DJF) for a maximum period of confinement for burglary and battery is affirmed where: 1) amendments to Welfare and Institutions Code sections 731 and 733 did not apply to a disposition that occurred before September 1, 2007; 2) the common-law rule requiring application of statutes that mitigate punishment to all cases not yet final on their effective dates was inapplicable; 3) the amendments did not mitigate punishment but only limited the places in which a ward could be defined; and 4) since the juvenile court committed minor-defendant to the DJF before September 1, 2007, he was not entitled to reversal of the commitment.