California CodesCode of Civil Procedure - CCPPreliminary ProvisionsSection 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.
Notes
Sets the method for computing a legally prescribed time period by excluding the first day and including the last day. If the last day is a holiday, that day is also excluded; the provision states no different rule based on the type of act, party, proceeding, or length of the period.
Use as reference
Lexinter.net | California Code, Code of Civil Procedure - CCP § 12 | https://laws.lexinter.net/codes/california/code-of-civil-procedure/preliminary-provisions/section-12