How do I set a lock code to work only between certain times?

[csteele]

Lock code by time of day

This could be done with Rule Machine. You can use a Custom Action to create a lock code, or to remove one. So you could do some scheduling to create the code you want at the time you want, and remove it at some other time.

That thread is a couple years old and an older RuleMachine UI. The concepts still exist in RM v5:

This uses a Custom Command, which is tricky to find: