A summons may be served on a Sunday or other legal holiday. (Strange v. Coryell, 3 CA 2d 635) But an officer has no duty to serve civil process on a holiday. (Whitney v. Butterfield, 13 C 336)
Generally a summons must be served within three (3) years after the action has commenced. A return shall be made within sixty (60) days after the time the summons and complaint must be served. (CCP 583.210) The time within which to complete service may be extended under certain conditions. Because of this possibility, a summons shall be served when so instructed, regardless of the time the suit was filed. (Barrington v. A.H. Robbins, 39 CA 3d 146)