code: public static boolean isLeapDay(TemporalAccessor temporal) {
      checkArgument(
          temporal.isSupported(MONTH_OF_YEAR), "%s does not support MONTH_OF_YEAR", temporal);
      checkArgument(temporal.isSupported(DAY_OF_MONTH), "%s does not support DAY_OF_MONTH", temporal);
      MonthDay monthDay = MonthDay.from(temporal);
      return monthDay.equals(LEAP_DAY);
    }
docs: Returns whether or not the given {@link TemporalAccessor} is leap day (February 29th).
  
  @return whether or not the given {@link TemporalAccessor} is leap day
  @throws IllegalArgumentException if the given {@link TemporalAccessor} does not support {@link
  ChronoField#MONTH_OF_YEAR} or {@link ChronoField#DAY_OF_MONTH}