I’m just another user, so it’s definitely not my Ticketing app. But when I start a new app using the Ticketing App as a starting point, I don’t see the error you mention (I can view the details of a ticket without an error about datetime vs date). So to know what’s going wrong, we’ll have to see the code you’re actually running.
The docs cover how to share a clone link, complete with screenshots: Anvil Docs | Cloning Apps