PHP Date_format警告

Question

我有一个带有下拉标记的表单：

MONTH   DAY  YEAR  HOURS  MINS

当我在提交表单时检索值时：

$selMonth = htmlentities($_POST['regmonth']);
$selDay = htmlentities($_POST['regday']);
$selYear = htmlentities($_POST['regyear']);
$selHours = htmlentities($_POST['reghours']);
$selMins = htmlentities($_POST['regmins']);

$date = date_create("".$selDay."-".$selMonth."-".$selYear." ".$selHours.":".$selMins."");
$actual_date = date_format($date, 'd-M-Y H:i');
$timestamp = strtotime($actual_date);
//echo $actual_dt.','.$timestamp;

我得到了正确的日期但始终有警告：

Warning: date_format() expects parameter 1 to be DateTime, boolean given in C:\wamp\www\source\form.php on line 37.

有人能说明为什么我会收到此警告。

Answer 1

$selMonth = htmlentities($_POST['regmonth']);
$selDay = htmlentities($_POST['regday']);
$selYear = htmlentities($_POST['regyear']);
$selHours = htmlentities($_POST['reghours']);
$selMins = htmlentities($_POST['regmins']);

$date = ("".$selYear."-".$selMonth."-".$selDay." ".$selHours.":".$selMins."");
$timestamp = Date("Y-m-d H:i",strtotime($date));