Writ petition from order on summary judgment / summary adjudication motion (other than entry of summary judgment): 20 days after service of notice of entry

CCP 437c(m)(1): "Upon entry of an order pursuant to this section, except the entry of summary judgment, a party may, within 20 days after service upon the party of a written notice of entry of the order, petition an appropriate reviewing court for a peremptory writ. If the notice is served by mail, the initial period within which to file the petition shall be increased by five days if the place of address is within the State of California, 10 days if the place of address is outside the State of California but within the United States, and 20 days if the place of address is outside the United States. If the notice is served by facsimile transmission, express mail, or another method of delivery providing for overnight delivery, the initial period within which to file the petition shall be increased by two court days. The superior court may, for good cause, and before the expiration of the initial period, extend the time for one additional period not to exceed 10 days."

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."