I don't use their mobile app, but in the past Amazon has quietly changed the delivery date without notifying me. I've gotten confirmation emails from them that

I don't use their mobile app, but in the past Amazon has quietly changed the delivery date without notifying me. I've gotten confirmation emails from them that have a later date than what was on the website, and the order history showing later dates than what was in the emails. I noticed this about two years ago, these days I have more leeway in time and don't pay as close attention