text date input validation

isValidDateLiteral.js

isValidDateLiteral: function (input){
  var validformat = /^\d{1,2}\/\d{1,2}\/\d{4}$/; //Basic check for format validity
  if (!input.match(validformat)) return false;
  var monthfield=input.split("/")[0];
  var dayfield=input.split("/")[1];
  var yearfield=input.split("/")[2];
  var dayobj = new Date(yearfield, monthfield-1, dayfield);
  if ((dayobj.getMonth()+1!=monthfield)||(dayobj.getDate()!=dayfield)||(dayobj.getFullYear()!=yearfield)) {
    return false;
  } else {
    return true;
  }
}