code: public void setMaxDayCharacters(int maxDayCharacters) {
  		if (maxDayCharacters == this.maxDayCharacters) {
  			return;
  		}
  
  		if (maxDayCharacters < 0 || maxDayCharacters > 4) {
  			this.maxDayCharacters = 0;
  		} else {
  			this.maxDayCharacters = maxDayCharacters;
  		}
  		drawDayNames();
  		drawDays();
  		invalidate();
  	}
docs: Sets the maximum number of characters per day in the day bar. Valid
  values are 0-4. If set to 0, dateFormatSymbols.getShortWeekdays() will be
  used, otherwise theses strings will be reduced to the maximum number of
  characters.
  
  @param maxDayCharacters
  the maximum number of characters of a day name.