Cal. Gov. Code § 19996.26

All persons employed in reduced worktime positions pursuant to Section 19996.21, shall receive, on a pro rata basis, except for benefits provided under the Public Employees’ Retirement Law and under the Public Employees’ Medical and Hospital Care Act, all benefits customarily available to full-time employees of state agencies in similar classes or positions. With regard to benefits provided under the Public Employees’ Retirement Law and under the Public Employees’ Medical and Hospital Care Act, persons employed in reduced worktime positions shall receive such benefits as are provided by law for persons employed for less than full time.