Can you leave a couple of days after your departure date for 14 advanced purchase on greyhound?

I was wondering if; well lets say the tickets were ordered today. Today is the 19th of June. If I had the 14 day advanced purchase, would I have to leave 14 days after it was bought which would be on the 3rd of July, or would I be able to leave 3 days after on July 7th?