code: function() {
  				if (typeof monthNames === 'function') {
  					var month = doubled('M') ?
  						monthNames.call(calendar, value.substring(iValue)) :
  						monthNamesShort.call(calendar, value.substring(iValue));
  					iValue += month.length;
  					return month;
  				}
  
  				return getName('M', monthNamesShort, monthNames);
  			}
docs: Extract a month number from the string value