"haber de" being used as "to have to"?
 

So, I was browsing the Word Reference forums and I saw the phrase "has de" being used as "you have to", and I was wondering if this is correct? Is it an appropriate alternative to "tener que"? Is it only used in Spain?

Any help would be appreciated.

The phrase 'haber de' can have three meanings - the one you mentioned (obligation), expressing an imminent or future event, and expressing a probable or sure thing.
These meanings are used universally.

Ha de prender la luz al entrar. You must turn on the light as you enter.
Ha de llover. Mira las nubes. It's about to rain. Look at the clouds.
Bien has de saber que no la quiero. You should already know that I don't love her.

Ahh, I see...Thank you! :)