docs: private GregorianCalendar getLastReleventDate(GregorianCalendar currentDate) {
  		int age=this.getProperties().getMaxFileAge();
  		GregorianCalendar result=new GregorianCalendar(currentDate.get(Calendar.YEAR),currentDate.get(Calendar.MONTH),currentDate.get(Calendar.DAY_OF_MONTH));
  		result.add(Calendar.DAY_OF_MONTH, -age);
  		return result;
  	}