Cal. Educ. Code § 87475

If an employee of a community college district has served as a contract employee of the district in a faculty position, for one complete school year, and in the year immediately preceding the service as contract employee has served as a temporary faculty member for at least 75 percent of the number of days the regular schools of the district were maintained, the governing board of the district may count the year of employment as a temporary employee as one year of the probationary period which he or she is required by law to serve as a condition to being classified as a regular employee of the district.