codeigniter: Obtener datos publicados entre dos fechas

Prueba Esto:

$this->db->where('sell_date BETWEEN "'. date('Y-m-d', strtotime($start_date)). '" and "'. date('Y-m-d', strtotime($end_date)).'"');

Espero que esto funcione

Esto funcionó muy bien para mí

$this->db->where('sell_date BETWEEN "'. date('Y-m-d', strtotime($start_date)). '" and "'. date('Y-m-d', strtotime($end_date)).'"');

Puede que esto le ayude.... Con la unión de Tres Tablas

public function get_details_beetween_dates()
    {
        $from = $this->input->post('fromdate');
        $to = $this->input->post('todate');

        $this->db->select('users.first_name, users.last_name, users.email, groups.name as designation, dailyinfo.amount as Total_Fine, dailyinfo.date as Date_of_Fine, dailyinfo.desc as Description')
                    ->from('users')
                    ->where('dailyinfo.date >= ',$from)
                    ->where('dailyinfo.date <= ',$to)
                    ->join('users_groups','users.id = users_groups.user_id')
                    ->join('dailyinfo','users.id = dailyinfo.userid')
                    ->join('groups','groups.id = users_groups.group_id');

        /*
        $this->db->select('date, amount, desc')
                 ->from('dailyinfo')
                 ->where('dailyinfo.date >= ',$from)
                 ->where('dailyinfo.date <= ',$to);
        */

        $q = $this->db->get();

        $array['userDetails'] = $q->result();
        return $array;
    }

$query = $this->db
              ->get_where('orders',array('order_date <='=>$first_date,'order_date >='=>$second_date))
              ->result_array();

Si desea comparar fechas SQL, puede probar esto:

$this->db->select();
$this->db->from('table_name');
$this->db->where(' date_columnname >= date("'.$from.'")');
$this->db->where( 'date_columnname <= date("'.$to.'")');

Eso funcionó para mí (PHP y MySQL).

Si desea forzar el uso ENTRE palabras clave en Codeigniter query helper. Puede usar donde sin escape false como este código. Funciona bien en CI versión 3.1.5. Espero que ayude a alguien.

if(!empty($tglmin) && !empty($tglmax)){
        $this->db->group_start();
        $this->db->where('DATE(create_date) BETWEEN "'.$tglmin.'" AND "'.$tglmax.'"', '',false);
        $this->db->group_end();
    }