date_interval_create_from_date_string

<?

$datetime = "1 day";

$return = date_interval_create_from_date_string($datetime);

echo date_interval_format($return, "%d");

?>

1

<?

$second = date_interval_create_from_date_string("1 second");
$minute = date_interval_create_from_date_string("1 minute");
$hour = date_interval_create_from_date_string("1 hour");
$day = date_interval_create_from_date_string("1 day");
$week = date_interval_create_from_date_string("1 week");
$month = date_interval_create_from_date_string("1 month");
$year = date_interval_create_from_date_string("1 year");

$format = "Y-m-d H:i:s";

$date = date_create();
echo date_format($date, $format) . PHP_EOL;

$date = date_create();
date_add($date, $second);
echo date_format($date, $format) . PHP_EOL;

$date = date_create();
date_add($date, $minute);
echo date_format($date, $format) . PHP_EOL;

$date = date_create();
date_add($date, $hour);
echo date_format($date, $format) . PHP_EOL;

$date = date_create();
date_add($date, $day);
echo date_format($date, $format) . PHP_EOL;

$date = date_create();
date_add($date, $week);
echo date_format($date, $format) . PHP_EOL;

$date = date_create();
date_add($date, $month);
echo date_format($date, $format) . PHP_EOL;

$date = date_create();
date_add($date, $year);
echo date_format($date, $format);

?>

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