Cal. Unemp. Ins. Code § 1326.5

An individual shall, to maintain his or her eligibility to file continued claims during a continuous period of unemployment, submit a continued claim not more than 14 days from the end of the last week’s ending date shown on the continued claim, or not more than 14 days from the date the department issued that continued claim, whichever is later, unless the department finds good cause for the individual’s delay in submitting the continued claim. An unemployed individual may not be disqualified for unemployment compensation benefits solely on the basis that the continued claim was submitted 15 to 21 days, inclusive, from the end of the last week’s ending date shown on the continued claim, or 15 to 21 days inclusive, from the date the department issued that continued claim, whichever is later.