California Code
ARTICLE 3 - Differential Compensation
Section 45185.

45185. An employee receiving differential compensation on the basis of his shift shall not lose such compensation if he is temporarily, for 20 working days or less, assigned to a shift not entitled to such compensation. The regular rate of pay for all purposes of an employee assigned to a shift which provides differential compensation shall be the differential rate.

(Enacted by Stats. 1976, Ch. 1010.)