docs: static String createDateStringFromIntegerInput(
              @IntRange(from = 1, to = 12) int month,
              @IntRange(from = 0, to = 9999) int year) {
          String monthString = String.valueOf(month);
          if (monthString.length() == 1) {
              monthString = "0" + monthString;
          }
  
          String yearString = String.valueOf(year);
          // Three-digit years are invalid.
          if (yearString.length() == 3) {
              return "";
          }
  
          if (yearString.length() > 2) {
              yearString = yearString.substring(yearString.length() - 2);
          } else if (yearString.length() == 1) {
              yearString = "0" + yearString;
          }
  
          return monthString + yearString;
      }