如何在运行查找的条件下将数据类型（日期时间）更改为（日期）？

I need get all posts from the current day (today), with the find below I'm not getting anything because the field pub_date (datetime) has time and the new \Datetime() returns the current date and time so, the date will match but the time not.

    $posts = $this->find('all', [
        'fields' => [
            'Posts.id',
            'Posts.title',
            'Posts.body',
            'Posts.pub_date',
        ],
        'conditions' => [
            'Posts.is_active' => true,
            'Posts.pub_date' => new \Datetime()
        ],
    ]);

In short terms, I need get all posts with date equal "today" dont matter the time.