Method _dateToISO

lib/Requestable.js:130–136

* if a `Date` is passed to this function it will be converted to an ISO string * @param {*} date - the object to attempt to coerce into an ISO date string * @return {string} - the ISO representation of `date` or whatever was passed in if it was not a date

(date)

    * @return {string} - the ISO representation of `date` or whatever was passed in if it was not a date
    */
   _dateToISO(date) {
      if (date && (date instanceof Date)) {
         date = date.toISOString();
      }

      return date;
   }

   /**
    * A function that receives the result of the API request.