Fandango let's you but tickets at least a week in advance
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For Star Wars: The Last Jedi, we ordered our tickets 2 months in advance. Again, it also depends on what kind of movie it is.
2 weeks and sometimes more depending on the movie, ill suggeste you tonuse Fandando to buy your tickets.
I would say about 2 weeks out. Since its AMC, your best bet is to check their site. As of this writing, they have advance tickets available for movies like The Opera House and Paddington 2, both of which open around Jan 12-13.
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