Is there an official FAA source for time zone of an airport? Looking at this answer, from TypeIA, to the question How to get timezone from airport code (IATA/FAA) .

This person is recommending the NASR database, which is good because it's official FAA stuff, but like other users I'm not able to find any information about time zone for an airport in NASR.

Is this information available via NASR or from any other official FAA source?

I do know that I can derive the information from lat/long etc., but what I'm looking for is the official FAA time zone designation for each airport, if such a thing exists. 

EDIT: Sorry, to be clear, I'm looking for a digital version of this data suitable for use in a database or app.
Each airports timezone is listed in the Airport/Facility Directory. I think the FAA is starting to call these "Chart Supplements" now though. You can search for specific airports here but it looks like the results are in .pdf format. The value you want is circled in red here:



EDIT: As far as digital sources, explicit time zone information seems missing from the NASR airport (APT) data here. The next best thing is Latitude/Longitude it seems.