查询不输出时间

Question

我无法得到

$result = DatabaseHandler::query($query);
            while ($row = $result->fetch_assoc()) {
                $this->mTaskDateCreated[] = $row;
            }

在用户提交表单后输出时间。由于其他两个$result返回输入到字段中的文本，因此我不确定问题的确切位置。 如何让$result返回datetime的值？

<?php
    class ProjectBody {
        public $mTasks = array();
        public $mTaskName = array();
        public $mTaskDateCreated = array();

        public function __construct() {


            if(isset($_POST['task_name']) && isset($_POST['task'])) {
                $task_name = DatabaseHandler::escape($_POST['task_name']);
                $task = DatabaseHandler::escape($_POST['task']);

                $query = "INSERT INTO `project` (name, task, date_created) VALUES ('$task_name', '$task', NOW())";
                $result = DatabaseHandler::query($query);
            }

            $query = "SELECT * FROM `project` ORDER BY `id` DESC";
            $result = DatabaseHandler::query($query);


            while ($row = $result->fetch_assoc()) {
                $this->mTaskName[] = $row;
            }
            $result = DatabaseHandler::query($query);

            while ($row = $result->fetch_assoc()){
              $this->mTasks[] = $row;  
            }
            $result = DatabaseHandler::query($query);

            while ($row = $result->fetch_assoc()) {
                $this->mTaskDateCreated[] = $row;
            }
        }
    }
?>

感谢。