Rent increase of 10% or less (Civ. Code 827(b)(2)): earliest effective date, at least 30 days after notice delivered

(b) (1) In all leases of a residential dwelling, commercial real property by a qualified commercial tenant, or of any interest therein, from week to week, month to month, or other period less than a month, the landlord may increase the rent provided in the lease or rental agreement, upon giving written notice to the tenant, as follows, by either of the following procedures:(A) By delivering a copy to the tenant personally.(B) By serving a copy by mail under the procedures prescribed in Section 1013 of the Code of Civil Procedure.(2) If the proposed rent increase for that tenant is 10 percent or less of the rental amount charged to that tenant at any time during the 12 months before the effective date of the increase, either in and of itself or when combined with any other rent increases for the 12 months before the effective date of the increase, the notice shall be delivered at least 30 days before the effective date of the increase, and subject to Section 1013 of the Code of Civil Procedure if served by mail.

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." Gov. Code 6707: "When the last day for filing any instrument or other document with a state agency falls upon a Saturday or holiday, such act may be performed upon the next business day with the same effect as if it had been performed upon the day appointed." FRCP 6(a): "The following rules apply in computing any time period specified in these rules, in any local rule or court order, or in any statute that does not specify a method of computing time. (1) ... (A) exclude the day of the event that triggers the period; (B) count every day, including intermediate Saturdays, Sundays, and legal holidays; and (C) include the last day of the period, but if the last day is a Saturday, Sunday, or legal holiday, the period continues to run until the end of the next day that is not a Saturday, Sunday, or legal holiday."