Is it passed or past my bedtime?

Is it passed or past my bedtime? Is it “past your bedtime” or “passed your bedtime?” Past your bedtime is a prepositional phrase, and thus it should use “past” not “passed.

Is it “past your bedtime” or “passed your bedtime?” Past your bedtime is a prepositional phrase, and thus it should use “past” not “passed.
See also  What is the longest kiss world record?