Cal. Code Regs. tit. 2 § 633.2
An employee whose salary is established on a monthly basis shall receive his monthly salary for any 21-day period in which he works 21 days or 168 hours, or for any 22-day pay period in which he works 22 days or 176 hours. For the purpose of computing the number of days or hours worked, time during which an employee is excused from working because of holidays, sick leave, vacation, compensating time off or other leave with pay shall be considered as time worked by the employee.
If an employee is required to work more than the normal amount of time in any pay period because his work schedule is other than five days a week, Monday through Friday, the extra time worked shall be credited the same as overtime. If such schedule requires him to work less than the normal amount of time, compensating time off shall be charged toward making up the deficiency.
An employee who is entitled to less than his full monthly salary for any pay period shall receive only that part of his monthly salary as the number of days he worked during the pay period bears to the total number of work days in the pay period.
Cal. Code Regs. Tit. 2, § 633.2