Insert auto date

Hello,

I am trying to insert automatic date but unable to do so.

mysql:

content_article
content_date
content_id
content_name


models\Pages_model.php

PHP Code:

public function insert_content()
        {
                
                $data = array(
                    'content_id' => $this->input->post('content_id'),
                    'content_name'  => $this->input->post('content_name'),
                    'content_article'  => $this->input->post('content_article')
                );
            
                return $this->db->insert('content', $data);
        } 


but I unable to see the actual current date printed there.  I wonder how to make it printed automatically just by inserting an article?

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