PHP Date_format警告

Question

我有一個帶有下拉標簽的表單：

MONTH   DAY  YEAR  HOURS  MINS

當我在提交表單時檢索值時：

$selMonth = htmlentities($_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;

我得到的日期正確，但始終會發出警告：

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

誰能說出我為什么收到這個警告。

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));