California Code, Code of Civil Procedure - CCP § 703.050

(a) The determination whether property is exempt or the amount of an exemption shall be made by application of the exemption statutes in effect (1) at the time the judgment creditor's lien on the property was created or (2) if the judgment creditor's lien on the property is the latest in a series of overlapping liens created when an earlier lien on the property in favor of the judgment creditor was in effect, at the time the earliest lien in the series of overlapping liens was created.

(b) This section applies to all judgments, whether based upon tort, contract, or other legal theory or cause of action that arose before or after the operative date of this section, and whether the judgment was entered before or after the operative date of this section.

(c) Notwithstanding subdivision (a), in the case of a levy of execution, the procedures to be followed in levying upon, selling, or releasing property, claiming, processing, opposing, and determining exemptions, and paying exemption proceeds, shall be governed by the law in effect at the time the levy of execution is made on the property.