This part applies to proceedings begun on or after January 1, 2016, to establish a support order or determine parentage of a child or to register, recognize, enforce, or modify a prior support order, determination, or agreement, whenever issued or entered.
Source:
Section 5700.902, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=FAM§ionNum=5700.902..