Flight Instructor reported the published airport operating hours are incorrect for AVX; Catalina Airport. After landing; another pilot informed the instructor the airport had closed at 1700 local time. The published time; as open 1600-0100Z; converts to 1800 local time in the month of June.

Narrative

On an instruction flight we departed ZZZ for AVX to conduct the practice VOR-A approach into AVX and make a full stop landing to provide a checkout flight for my student for the AVX airport as the airport and approach have unique hazards to be aware of. I (instructor) checked NOTAMS for AVX and briefly read the AFD regarding AVX. We received VFR flight following to and during the practice approach into AVX. Upon landing and taxiing to transient parking we were informed by a local pilot that the airport was closed and had closed at 1700 local time (2400 UTC); we had landed at approximately 1730 local time. I had not read the AFD closely enough to note that the airport is closed to operations when un attended which it states is at (0100 UTC) with a conversion (-8(-7 DT))of -7 during day light savings time which it currently is (date of incident). So according to the AFD the airport attended hours are 1600-0100Z which when using the time conversion would indicate the airport closes at 1800 local time and not 1700 local time. I think the AFD should be updated to show that the airport is closed at 1700 LCL and or a NOTAM be issued as many pilots could easily gloss over the airport remarks section as I did.