code: function defaultLongDateFormatter(date) {
          // Example: 'Thursday June 18 2015'
          return [
            service.days[date.getDay()],
            service.months[date.getMonth()],
            service.dates[date.getDate()],
            date.getFullYear()
          ].join(' ');
        }
docs: Default formatter for date cell aria-labels.
  @param {!Date} date
  @returns {string}