Actually, you are to receive written notice about your deposit.
That means you could receive the entire amount, or a smaller amount less any deductions claimed by the landlord.
Don't rely on a specific date, although the law may says so many days, it could take longer (and often does) to receive a check or an explanation and bill.
Plus, you might have a $1,000 deposit, but could end up owing $2,000 to the landlord, if damages are alleged.
I suggest you contact the landlord and ask him/her when you'll be receive the deposit.
The law in your state:
Under California law, 21 calendar days or less after you move, your landlord must either:
Send you a full refund of your security deposit, or
Mail or personally deliver to you an itemized statement that lists the amounts of any deductions from your security deposit and the reasons for the deductions, together with a refund of any amounts not deducted.218
The landlord also must send you copies of receipts for the charges that the landlord incurred to repair or clean the rental unit and that the landlord deducted from your security deposit. The landlord must include the receipts with the itemized statement.219 The landlord must follow these rules:
If the landlord or the landlord's employees did the work - The itemized statement must describe the work performed, including the time spent and the hourly rate charged. The hourly rate must be reasonable.
If another person or business did the work - The landlord must provide you copies of the person's or business' invoice or receipt. The landlord must provide the person's or business' name, address, and telephone number on the invoice or receipt, or in the itemized statement.
If the landlord deducted for materials or supplies - The landlord must provide you a copy of the invoice or receipt. If the item used to repair or clean the unit is something that the landlord purchases regularly or in bulk, the landlord must reasonably document the item's cost (for example, by an invoice, a receipt or a vendor's price list)220
If the landlord made a good faith estimate of charges - The landlord is allowed to make a good faith estimate of charges and include the estimate in the itemized statement in two situations: (1) the repair is being done by the landlord or an employee and cannot reasonably be completed within the 21 days, or (2) services or materials are being supplied by another person or business and the landlord does not have the invoice or receipt within the 21 days. In either situation, the landlord may deduct the estimated amount from your security deposit. In situation (2), the landlord must include the name, address and telephone number of the person or business that is supplying the services or materials.
Within 14 calendar days after completing the repairs or receiving the invoice or receipt, the landlord must mail or deliver to you a correct itemized statement, the invoices and receipts described above, and any refund to which you are entitled.
Your deposit could be reduced if you were supposed to be out on the 1st of December, but left on the 7th of December.
That includes the scenario where you left some of you stuff behind in the unit for seven days!
If that is what happened in your case, you'll owe another month's rent in FULL for those seven days of usage.
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California Tenants - California Department of Consumer Affairs