California Code, Code of Civil Procedure - CCP § 995.420

(a) Unless the statute providing for a bond provides that the bond becomes effective at a different time, a bond is effective at the time it is given or, if the statute requires that the bond be approved, at the time it is approved.

(b) If the statute providing for a bond provides that the bond becomes effective at a time other than the time it is given or approved, the bond is effective at the time provided unless an objection is made to the bond before that time. If an objection is made to a bond before the time provided, the bond becomes effective when the court makes an order determining the sufficiency of the bond.