"Tomorrow might be difficult." -> Is this sentence is natural for real?

Question

I wonder the sentence "Tomorrow might be difficult." is natural.

For meaning like this context :

A : how about having dinner with me tomorrow?

B : Tomorrow might be difficult. I have to do work.

Thanks for your answer in advance!!

Answer 1

Yes, this is an idiomatic way of saying

It might be difficult for me to (have dinner) tomorrow.

Similarly you can say

Tomorrow is good.

Tomorrow can function both as a noun and as an adverb.