To complicate things further some airfields will accept you "out of hours" as an insurance indemnity. (Provided they are happy with your insurance documents, certain weather minima are met and it is daytime).
You usually have to be based there but moaning ad nauseam can occasionally open doors.
I rarely arrive and depart during "open" hours at one the the fields I regularly commute into as I need to be at work earlier than ATC start and usually finish work later than they finish.
Am I in the wrong job?
SB