<script>
lp.jQuery(function($) {
  var ruleID = 'dob'
  var field = 'date_of_birth';
  var message = 'Please enter a date in this format: MM/DD/YYYY';
  var rules = module.lp.form.data.validationRules[field];
  $.validator.addMethod(ruleID, function(value, field) {
var valid = /^([0-9]{2})\/([0-9]{2})\/([0-9]{4})$/.test(value);
return valid || (!rules.required && !value);
}, message);
rules[ruleID] = true;
});
</script>