<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>「YYYY/MM/DD」形式の日付を利用したい</title>
</head>
<body>
<?php
$originalDate = '2009/02/28';
$timeStamp = strtotime($originalDate);
$timeStamp2 = strtotime('+1 day', $timeStamp);
echo '<p>元の日付: ' . $originalDate . '<br />';
echo 'UNIXタイムスタンプ: ' . $timeStamp . '<br />';
echo 'date()関数で変換処理: ' . date('Y/m/d', $timeStamp) . '<br />';
echo 'date()関数で1日加算後の変換処理: ' . date('Y/m/d', $timeStamp2);
echo '</p>';
$originalDate = '2009-2-28';
$timeStamp = strtotime($originalDate);
$timeStamp2 = strtotime('+1 day', $timeStamp);
echo '<p>元の日付: ' . $originalDate . '<br />';
echo 'UNIXタイムスタンプ: ' . $timeStamp . '<br />';
echo 'date()関数で変換処理: ' . date('Y/m/d', $timeStamp) . '<br />';
echo 'date()関数で1日加算後の変換処理: ' . date('Y/m/d', $timeStamp2);
echo '</p>';
?>
</body>
</html>