code: function isIso8601DateTimeString(value) {
      var regex = /^(([+-]\d{6}|\d{4})(-(0[1-9]|1[0-2])(-(0[1-9]|[12]\d|3[01]))?)?)(T((([01]\d|2[0-3])(:[0-5]\d)(:[0-5]\d(\.\d{1,3})?)?)|(24:00(:00(\.0{1,3})?)?))(Z|([+-])([01]\d|2[0-3]):([0-5]\d))?)?$/;
  
      // Verify that it's in ISO 8601 format (via the regex) and that it represents a valid point in time (via Date.parse)
      return regex.test(value) && !isNaN(Date.parse(value));
    }
docs: Check that a given value is a valid ISO 8601 format date string with optional time and time zone components