If I purchased a ticket that’s valid for the same night but I meant to buy for a different night and I don’t use it would I be able to switch it ?

As long as it never got scanned

Can we stay after 6pm

It's possible. Best to check with them first first before going and get screwed

Check with universal... there's a reason why they are dated..

I'd check the restrictions on the ticket or call Universal.

Call 1-800-universal

As long as it's not a special event you should be fine

I don't see why not as long as you got the receipt.

What can I do if I want to change the dates I have? I can not go I was presented with a family situation

You can

The answer is no you cannot