Customization: date for Point of Sale

Hi everyone:

I want to perform what I think is a small customization of the Point of Sale page in ERPNext v15

When users are entering the sale details, besides selecting the customer and items, should be also provided with a date field to inform about the date of the transaction. That date will ultimatelly be the posting_date of the related POS Invoice.

The reason for this, is that some new user won’t be able to register the sales on the moment, but when having access to the app. I guess I can ask them to switch to the form view of the POS to edit the field, but I want to make the process as simple as possible.

I have prepared a custom app, and I’m able to perform customizations of DocType but I have realized that the interface for the Point of Sale is a Frape Page. How to achieve the customization in this case?

Any pointers would be highly appreciated