product ID php code

[arjundass]

I have 2 products in my website. I have added an creation date field and expiration date field in orders table. I have populated the creation date field with date when order is placed , need to populate the expiration field .

I am using product id to fill expiration field , If product id = 5 , then expiration_date = creation date + 30 days
Else
product id = 10 then expiration_date = creation date + 60 days

Kindly help with PHP code .