Amend once without leave after demurrer or motion to strike filed

A party may amend its pleading once without leave of the court at any time before the answer, demurrer, or motion to strike is filed, or after a demurrer or motion to strike is filed but before the demurrer or motion to strike is heard if the amended pleading is filed and served no later than the date for filing an opposition to the demurrer or motion to strike. A party may amend the pleading after the date for filing an opposition to the demurrer or motion to strike, upon stipulation by the parties. The time for responding to an amended pleading shall be computed from the date of service of the amended pleading.

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."