Filing fee check returned unpaid: pay filing fee and administrative charge within 20 days of clerk's mailing of notice, or filing is voided

(b) The clerk shall void the filing if the party who tendered a returned check or on whose behalf a returned check was tendered has not paid the full amount of the fee and the administrative charge by a means specified in subdivision (a) within 20 days of the date on which the notice required by subdivision (a) was mailed. Any filing voided by this section can be disposed of immediately after the 20 days have elapsed without preserving a copy in the court records, notwithstanding Section 68152 of the Government Code. ... (e) If any trial or other hearing is scheduled to be heard prior to the expiration of the 20-day period provided for in subdivision (a), the fee shall be paid prior to the trial or hearing.

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."