CA Civ Code Section 3426.10

This title does not apply to misappropriation occurring prior to January 1, 1985. If a continuing misappropriation otherwise covered by this title began before January 1, 1985, this title does not apply to the part of the misappropriation occurring before that date. This title does apply to the part of the misappropriation occurring on or after that date unless the appropriation was not a misappropriation under the law in effect before the operative date of this title.