California Code
ARTICLE 3 - Proof of Service
Section 684.210.

684.210. If service of notice of a court hearing is required under this title, proof of service of the notice shall be made at or before the hearing to the satisfaction of the court.

(Added by Stats. 1982, Ch. 1364, Sec. 2. Operative July 1, 1983, by Sec. 3 of Ch. 1364.)