Jack: Mommy, is it tomorrow yet?
Me: No, it's not tomorrow yet. Actually it's never tomorrow.
(I've heard this question before. It's so hard to explain it to him so I thought I'd just be blunt for this conversation.)
Jack: Then what day is it?
Me: Today is Sunday. It's always today.
Jack: When is it going to be tomorrow?
Me: Why do you want it to be tomorrow?
Jack: Because I want to eat my cookie and you said I could eat it tomorrow.
Me: Oh, okay, yes it is tomorrow. Let's go eat your cookie.