docs: protected static int[] toYYYYMM_DD(long timestampMs) {
          Calendar cal = Calendar.getInstance();
          cal.setTimeInMillis(timestampMs);
  
          int yyyy = cal.get(Calendar.YEAR);
          int mm = cal.get(Calendar.MONTH) + 1;
          int dd = cal.get(Calendar.DAY_OF_MONTH);
  
          return new int[] { yyyy * 100 + mm, dd };
      }