I am a landlord and a renter, so speaking from experience, the laws in California favor renters, as it should IMO.
In, California, if a lease is month to month then you need to only give 30 day notice, if it is a week then one week notice. I was month to month. The landlord acknowledges receipt at the next day Eastern Time. I believe that if you use regular mail, then the time clock starts the day of the postmark. Again the laws favor renters. The property is in California, so I would guess that time zone dictates the time clock.