To avoid unnecessary processing of stale data, I need to find out when a GTFS dataset was published or last updated.
In some cases, I can check the time stamp of the zip file, but that doesn't work in other cases.
The GTFS standard specifies a feed_info.txt file, which can be used but it's an optional file and I don't find it in sources I have to deal with.
This should be a question that has been discussed in this group, but my search didn't turn up anything. Sorry if it's an old topic.