Dynamic "pivot group" names for Unpivot

Hi,
We receive a csv that contains dates in the header row. The values for each date is a quantity associated to an item part number. See attached for an example file.
We are able to successfully use the unpivot function to normalize these.

Our issue is this:
The dates change and are very important. When a date has passed, it is no longer given to us, and we see a new date in the future. For example in the file provided, once 10/17/2019 is over, it will no longer be given and we will see the next date in the future of 11/28/2019.

When using the unpivot function, in the "pivot group" tab, we have manually entered the dates under "pivot group." This cannot work for us due to consistantly changing values.

Is there a way to dynamically set a "pivot group" name to the header value?

Hello

Is number of headers always the same?

Yes.

OK in this case what you need to do is to convert your data into something like this.
We will create a working example for you

Here is the examples screenshots

I have attached the actual example for your convenience