Billbee API Invoice Date Issue

[firatgk]

I cannot set the invoice date in the SDK I am using. When I try to create an invoice for a past date, Billbee does not accept it and sets the invoice date as the day I created the invoice. I cannot provide dates using setInvoiceDate or setCreatedAt. It always takes the date the invoice was created. I want to learn how to set the date via the API.

i use this sdk: https://github.com/billbeeio/billbee-php-sdk.git