This is what I ended up doing to fix the issue on the front end
edited this file
/wp-content/plugins/wp-application-deadline/assets/js/deadline.js
Changed line 17 from
var date = new Date( jQuery(this).val() );
to
var date = new Date( jQuery(this).val().replace(/-/g, ‘\/’).replace(/T.+/, ”));
Question is there a way for me to do this in a function or child theme override?
Thanks
Jeremy