Altering WinSCP timestamp, get file(s) from a specified date-named folder

Reposting from Stack Overflow:
Altering WinSCP timestamp, get file(s) from a specified date-named folder

I have a directory that has multiple folders that are date-named YYYYMMDD and they have text file(s) in them.

I want to be able to get the files from the folder that was named with the date 5 days ago.

The script below gets the current date named folder by using %TIMESTAMP#yyyymmdd%:
For instance, lets say today is 20180724. It will get all the text file(s) from the folder named 20180724; however, I want it to get the text file(s) from the folder named 20180719 which will be 5 days previous. How do I approach this?

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