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解答例

PHP

<?php
header("Content-type: text/html; charset=utf-8");

date_default_timezone_set("Asia/Tokyo");

$year = 2006;
$month = 9;
$day = 30;

if(checkdate($month, $day, $year)){
	echo "{$year}年{$month}月{$day}日は実在する日付です！<br>";
}
else{
	echo "{$year}年{$month}月{$day}日は実在しない日付です！<br>";
}

$year = 2006;
$month = 9;
$day = 31;

if(checkdate($month, $day, $year)){
	echo "{$year}年{$month}月{$day}日は実在する日付です！<br>";
}
else{
	echo "{$year}年{$month}月{$day}日は実在しない日付です！<br>";
}
?>

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