California Code, Business and Professions Code - BPC § 2982

(a) All licenses expire and become invalid at 12 midnight on the last day of February, 1980, and thereafter shall expire at 12 midnight of the last date of the two-year period from the date the license was issued.

(b) To renew an unexpired license, the licensee, on or before the date on which it would otherwise expire, shall apply for renewal on a form provided by the board, accompanied by the prescribed renewal fee.