(a) This part is operative on July 1, 2012.
(b) Notwithstanding subdivision (a), the effectiveness of a notice given or other action taken on a work of improvement before July 1, 2012, is governed by the applicable law in effect before July 1, 2012, and not by this part.
(c) A provision of this part, insofar as it is substantially the same as a previously existing provision relating to the same subject matter, shall be construed as a restatement and continuation thereof and not as a new enactment.