I am using a code that I found here to make a Datepicker (I need two, I want to distinguish by dates some queries) . I'm quite new to web development, this is my second major project, so it's probably a simple thing, but I'm eating my head.
I know it must be something related to the JS code, since it is the least expert I have, but my question is what may be failing so that it does not open the way it should.
Annex my code. Anyway, if you have any advice to give me, it will be well received