So why does it HAVE to be YYYY-MM-DD?
Because Chrome uses the OS’s date format any form submitted from Chrome using the HTML5 picker on a system that is not using YYYY-MM-DD fails.
I was able to set the Jquery datapicker in CF7 to submit the date as DD-MM-YYYY which would match what would be submitted from Chrome in my country, and then I thought I would alter the validation script to match but I am not having any luck with that as I can’t locate what code I should be changing.
It is seeming to me that I because I am in a country that uses DD-MM-YYY on most of its systems, that until I nut out the validation I am not going to be able to use a date picker at all in CF7, either JQuery or HTML5.