If the time and place of birth are not known, the petition shall contain all of the facts known to the petitioner or otherwise available and a statement of the probable time and place of birth as accurately as the circumstances permit. The petition shall be verified as to the known facts only.
Source:
Section 103460, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=103460..