Cal. Government Code § 19998.4

(a) An employee who entered county employment pursuant to a resolution or agreement effecting the transfer of that employee by the State Department of Mental Health to a local mental health services program in accordance with Chapter 1330 of the Statutes of 1984, shall, upon reentry into state service, be credited with vacation and sick leave owed to that employee by the county, except as provided by subdivisions (b) and (c). (b) Any hours of vacation and sick leave for which the employee receives monetary compensation upon separation from the county, shall be deducted from the total hours of vacation and sick leave to which the employee is entitled. The credit for accumulated vacation and sick leave shall not exceed that to which each employee would be entitled if he or she had been continuously employed by the State of California in the classification in which he or she held permanent status at the time of separation from state service. (c) The separation from state service shall be considered permanent for purposes of subdivision (a) and no vacation or sick leave credit for time employed by the county shall be granted by the state if either of the following has occurred: (1) The employee permanently separated from county service for six months or longer. (2) More than five years elapsed since the employee was transferred by the department to the county.