We post screening times for most of the films showing at the main cinemas around Beijing as part of our weekly Tuesday Film Roundup. For other days, aside from a few cinemas with English language websites, it's not easy to get info in English. Two options, not ideal but do give you an idea, one is to follow the advice given in this post and then enter the results into a translation site like this one. Similarly you could put this site through the translation machine too.