When in the Plex web page, TV Recordings show the date of recording in US format (eg September 30, 2016). I prefer and am quicker to grasp the date in the logical (and near-universal) format: 30 September 2016.
Yea, the major players in the big game of life tried to get us (US) to conform to the metric system, but that went over like a lead balloon… Some 30 years (?) after those first feeble attempts failed our rulers still come marked in feet and inches and we buy gasoline by the US Gallon just like the pioneers did when they forged this land into a nation - after stealing it from the Native Americans… and the British.
AFAIK TVDB is still working on the assumption that the month comes before the year and the day goes in the middle. There could be an Agent out there somewhere that alters this setup, but I am not aware of it’s existence.
Actually if you edit a title you see that it’s YEAR-Month-Day, but then Plex turns it around to really confuse the issue… so what are ya gonna do?
I’ve just started using Plex and noticed the date is still in US format. As @mdubash said, it should be easy to get this changed on the web page. Ideally, there could be a setting to allow to change to whatever format you want.