how to fix a JavaScript Warning to disable a date field

Hello all, I'm revisiting this error that I can't seem to shake. It's kind of weird that when I turn off the custom formatting in the field I am trying to hide, the function works then I change it back. It works after changing it back. Then somewhere along the way it reverts and give off the error warning: JavaScript Window -

"Invalid date/time: please ensure that the date/time exists. Field [ArrestFile.1.Person.DOA ] should match format yyyy/mm/dd"

It does match this custom date format. I'm scracthing my head at this point. Had this form way too long now. Someone help if possible... much appreciated any help at all.