GOV §915.2: (a) If a claim, amendment to a claim, or application to a public entity for leave to present a late claim is presented or sent by mail under this chapter, or if any notice under this chapter is given

(a) If a claim, amendment to a claim, or application to a public entity for leave to present a late claim is presented or sent by mail under this chapter, or if any notice under this chapter is given by mail, the claim, amendment, application, or notice shall be mailed in the manner prescribed in this section. The claim, amendment, application, or notice shall be deposited in the United States post office, a mailbox, sub-post office, substation, mail chute, or other similar facility regularly maintained by the government of the United States, in a sealed envelope, properly addressed, with postage paid. The claim, amendment, application, or notice shall be deemed to have been presented and received at the time of the deposit. (b) Any period of notice and any duty to respond after receipt of service of a claim, amendment, application, or notice is extended 5 days upon service by mail, if the place of address is within the State of California, 10 days if the place of address is within the United States, and 20 days if the place of address is outside the United States. This subdivision shall not apply to the written notice set forth in Section 945.6 or the filing of a complaint after denial of a claim. (c) As applied to this section, proof of mailing may be made in the manner prescribed by Section 1013a of the Code of Civil Procedure. (d) If a claim, amendment to a claim, or application to a public entity for leave to present a late claim is submitted electronically, or if any notice under this chapter is given electronically, proof of electronic service may be made in a manner prescribed by Section 1013b of the Code of Civil Procedure, and proof of electronic service may be signed as provided in subparagraph (B) of paragraph (2) of subdivision (e) of Section 1010.6 of the Code of Civil Procedure.