Times and even movies received sometimes vary. Things get pushed back or even bumped so while they have a tentative schedule they only publish them a few days out. Exceptions would be advanced Ticket sales but even those have been known to change...it's rare but happens.
Consider getting Fandango app. Very good at finding theaters movies showtimes
Go on there website and look at their list of movies and their showtime and it's there, when they release the movie they show the times always
They do.
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