Issue When Input Date in Form

[Ravindrage]

When I enter Date in Form . Date and DateTime both input fields in not submiting on salesforce
I am using Javascript and jQuery to submit Form . All data going through Ajax.

[{"errorCode":"APEX_ERROR","message":"System.SObjectException: Illegal assignment from String to Date\n\nClass.WEB_FormAnyObject_REST.doAnything: line 40, column 1"}]