Petition for writ of administrative mandamus against a local agency (CCP 1094.6): 90 days after decision becomes final

CCP 1094.6(b): "(b) Any such petition shall be filed not later than the 90th day following the date on which the decision becomes final. If there is no provision for reconsideration of the decision, or for a written decision or written findings supporting the decision, in any applicable provision of any statute, charter, or rule, for the purposes of this section, the decision is final on the date it is announced. ... If there is a provision for reconsideration, the decision is final for purposes of this section upon the expiration of the period during which such reconsideration can be sought; provided, that if reconsideration is sought pursuant to any such provision the decision is final for the purposes of this section on the date that reconsideration is rejected. If there is a provision for a written decision or written findings, the decision is final for purposes of this section upon the date it is mailed by first-class mail, postage prepaid, including a copy of the affidavit or certificate of mailing, to the party seeking the writ. Subdivision (a) of Section 1013 does not apply to extend the time, following deposit in the mail of the decision or findings, within which a petition shall be filed."

CCP 12: "The time in which any act provided by law is to be done is computed by excluding the first day, and including the last, unless the last day is a holiday, and then it is also excluded." CCP 12a(a): "If the last day for the performance of any act provided or required by law to be performed within a specified period of time is a holiday, then that period is hereby extended to and including the next day that is not a holiday. For purposes of this section, “holiday” means all day on Saturdays, all holidays specified in Section 135 and, to the extent provided in Section 12b, all days that by terms of Section 12b are required to be considered as holidays." CCP 12b: "If any city, county, state, or public office, other than a branch office, is closed for the whole of any day, insofar as the business of that office is concerned, that day shall be considered as a holiday for the purposes of computing time under Sections 12 and 12a." CCP 10: "Holidays within the meaning of this code are every Sunday and any other days that are specified or provided for as judicial holidays in Section 135."