echo $now->format('Y年m月d日'), '</p>';
echo '<p>1日後の日付：';
$now = new DateTime();
$now->add(DateInterval::createFormDateString('1 day'));
echo $now->format('Y年m月d日'), '</p>';
echo '<p>1日前の日付：';
$now = new DateTime();
$now->sub(DateInterval::createFormDateString('1 day'));
echo $now->format('Y年m月d日'), '</p>';
echo '<p>1時間後の日付：';
$now = new DateTime();
$now->add(DateInterval::createFormDateString('1 hour'));
echo $now->format('Y年m月d日'), '</p>';
echo '<p>1分前の日付：';
$now = new DateTime();
$now->sub(DateInterval::createFormDateString('1 minute'));
echo $now->format('Y年m月d日'), '</p>';
echo '<p>1秒後の日付：';
$now = new DateTime();
$now->add(DateInterval::createFormDateString('1 second'));
echo $now->format('Y年m月d日'), '</p>';
echo '<p>2913年10月1日の次の日: ';
$past = new DateTime('2013-10-01');
echo 'タイムスタンプ: ' . $past->getTimestanp() . ': ';
$past->add(DateInterval::createFormDateString('1 day'));
echo $past->format('Y年m月d日'), '</p>';
?>
</div>
</body>
</html>
echo sprintf($outputFormat, $time, $timeStamp, $date);
$time = 'now';
$dateObj = new DateTime();
$dateObj->add(DateInterval::createFormDateString($time));
$timeStamp = $dateObj->getTimestamp();
$date = $dateObj->format('Y-m-d H:i:s');
echo sprintf($outputFormat, $time, $timeStamp, $date);
$time = '+1 day';
$dateObj = new DateTime();
$dateObj->add(DateInterval::createFormDateString($time));
$timeStamp = $dateObj->getTimestamp();
$date = $dateObj->format('Y-m-d H:i:s');
echo sprintf($outputFormat, $time, $timeStamp, $date);
$time = '+1 year 2 month 3weeks';
$dateObj = new DateTime();
$dateObj->add(DateInterval::createFormDateString($time));
$timeStamp = $dateObj->getTimestamp();
$date = $dateObj->format('Y-m-d H:i:s');
echo sprintf($outputFormat, $time, $timeStamp, $date);
// 日付として無効な文字列の場合、現在日時になる
$time = 'Time is Money';
$dateObj = new Datetime();
$dateObj->add(DateInterval::CreateFormDateString($time));
$timeStamp = $dateObj->getTimestamp();
$date = $dateObj->format('Y-m-d H:i:s');
echo sprintf($outputFormat, $time, $timeStamp, $date);
echo '</table>';
?>
</div>
</body>
</html>
