If the deal of the day sign is posted upon entering, and then it's changed AFTER ordering that deal, should management still offer the discount?

Yes definitely

Absolutely! Unless you ask about it and they tell you otherwise.

Of couse they should. It is the managers responsibility to make sure all offers are current and charged correctly.

I would think so.

Thanks for the responses. To answer the question, no they did not honor the deal, because they said that was yesterday's deal. After I ordered, they switched deals, and would not honor the post. I won't ever return there...

Absolutely

I wouldn't eat there, last time I ate there my date and I both got sick and we ate two different dishes, we were both so violently ill that we both ended up in the hospital. An expensive dinner $$$

Yes they should, that is if they want return business.