code: function(date, useLongName) {
  				if (useLongName) {
  					return (typeof monthNames === 'function') ?
  						monthNames.call(calendar, date) :
  						monthNames[date.month() - calendar.minMonth];
  				} else {
  					return (typeof monthNamesShort === 'function') ?
  						monthNamesShort.call(calendar, date) :
  						monthNamesShort[date.month() - calendar.minMonth];
  				}
  			}
docs: Format a month name, short or long as requested