We are using Adaptive form datepicker is not working on internet explorer 11. Though we enter the date, on submit it does not recognise the date from date picker. This was working fine on AEM 6.4, it started failing in AEM 6.5
IE 11 isn't actually supported by AEM 6.5.
You can see the the browser compatibility matrix here: https://docs.adobe.com/content/help/en/experience-manager-65/deploying/introduction/technical-requir...
Here is the line in question:
A similar issue is fixed on AEM forms 6.5.5+Hotfix, please test on the same.