Unless your expired lease provides otherwise, California law provides that a tenant can give a 30 day notice on any day of the month. (See CA Civil Code 1946 and 1946.1). Civil Code section 1946 uses the phrase "at any time" with regard to the 30 day notice.
Frank W. Chen has been licensed to practice law in California since 1988. The information presented here is general in nature and is not intended, nor should be construed, as legal advice for a particular case. This Avvo.com posting does not create any attorney-client relationship with the author. For specific advice about your particular situation, please consult with your own attorney.