gentelella/vendors/parsleyjs/src/extra/validator/dateiso.js

Gentelella Admin is a free to use Bootstrap admin template

// Load this after Parsley for additional comparison validators

window.Parsley.addValidator('dateiso', {
  validateString: function (value) {
    return /^(\d{4})\D?(0[1-9]|1[0-2])\D?([12]\d|0[1-9]|3[01])$/.test(value);
  },
  priority: 256
});