Problem:
I filtered my film collection by last viewed before 2018, but I realized my history doesn’t go that far back because I’ve reinstalled Plex without having backup data.
I’d like to know the date when my current server first went online.
Troubleshooting:
I’ve done none because I have no idea where to start.
Look at the folder date of the main folders in your Plex data folder
Or you try this: http://192.168.1.2:32400/status/sessions/history/all (can take a long time)
(replace the IP address with the actual local IP of your Plex server device)
The first <Video line of the output has the viewedAt value which holds the date of the first played item in UNIX epoch format.