Cal. Fam. Code § 7635.5

In any action brought pursuant to this article, if the alleged father is present in court for the action, the court shall inform the alleged father of his right to have genetic testing performed to determine if he is the biological father of the child. The court shall further inform the alleged father of his right to move to set aside or vacate a judgment of paternity pursuant to Section 7646 within two years of the date he received notice of the action to establish paternity, and that after that time has expired he may not move to set aside or vacate the judgment of paternity, regardless of whether genetic testing shows him not to be the biological father of the child.