code: public Integer getDay() {
  		String dateValue = getValue();
  
  		if (dateValue != null && dateValue.length() == DAY_END) {
  			return parseDateComponent(dateValue.substring(DAY_START, DAY_END), getPaddingChar());
  		} else {
  			return null;
  		}
  	}
docs: Returns the day of the month value.
  
  @return the day of the month, or null if unspecified.