You can't describe a movie with an adjective derived from the time the movie finishes. How would the listener know that "quarter past six" is the end time rather than the start time? And certainly the end time is not an inherent part of the movie.
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BarbaraPAWe might say "Do you want to go to the 6:15 show or the 8:20 show?"And we would be referring to the start times, not the end times!