docs: private String getDateSuffix() {
  		
  		Calendar cal = Calendar.getInstance();
  		int year = cal.get(Calendar.YEAR);
  		int month = cal.get(Calendar.MONTH); // 0 to 11
  		int day = cal.get(Calendar.DAY_OF_MONTH);
  		int hour = cal.get(Calendar.HOUR_OF_DAY);
  		int minute = cal.get(Calendar.MINUTE);
  		int second = cal.get(Calendar.SECOND);
  
  		return String.format("-%4d-%02d-%02d_%02dh%02dm%02ds", year,
  				(month + 1), day, hour, minute, second);
  	}