You are -I guess you mean for the future. (Rather than you are posting on this site or you are my friend). You are going to work on Monday - I know this because you have a job and there is evidence/ my experience that tells me so.
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AnonymousI want to know about the difference between you are to and you have toIn the words of Swann (Practical English Usage, 3rd edn, § 91.1 and 91.2)
1. Plans and arrangements: He is to visit Nigeria
We use this structure in a formal style to talk about official and other plans and arrangements.
The President