Adding a date to the image name

[omarphp]

Hello All,

I'm new to php and this my first post here my problem is that i want to add the date() function before the image name when the user upload his image. below is the sql statement that is used to save the image name:
if (isset($data['image'])) {
$this->db->query("UPDATE " . DB_PREFIX . "product SET image = '" . $this->db->escape($data['image']) . "' WHERE product_id = '" . (int)$product_id . "'");

Thanks in advance