I want to print old date on invoice

Hi Support team,
Could you please advise how can I print old date on invoice, by default I am getting current date or invoice created date, even I change and write the old date in invoice. I want to create back dated invoices.
The field value is Invoice Date: $aos_invoices_date_entered.

Regards,
Hamad.

The date_entered refers to the date when the record was created. You may use invoice_date in your template. $aos_invoices_invoice_date