Can the certificate of origin of China and South Korea be co

Recently, there are bills of goods exported to South Korea. We need to do the certificate of origin of China and South Korea FTA. When I first contacted the certificate of origin, I saw a lot of information on the Internet saying that the date of the certificate of origin should not be later than the date of shipment. Then some said that it can be handled seven days before and after the date of bill of lading. I don't know which is correct. There is a departure date on the certificate of origin of China and South Korea FTA. This is the date of sailing, right? Do you know the shipping date until the ship leaves? If you want to be earlier than the sailing date, you have to get the confirmation copy of the bill of lading and start to apply for the certificate of origin. Now I would like to ask, can you do the certificate of origin of China and South Korea FTA certificate of origin to get the confirmation copy of bill of lading?