All of my dating is YYYYMMDD or YYYYMM. Anything that comes before the '.' (e.g. 41.Eberron Campaign) is a two digit code to describe the file, the first digit = type of document and the second digit = personal priority.
It's probably convoluted from the outside looking in, but it works for me.
I see - and of course, that it works for you is most important.
I was thrown off by "11.2020 PRIMARY TASKS", which looked like November 2020 at first glance. Now that you mention it, I see that you have a YYYYMMDD filename on that same line.
It's probably convoluted from the outside looking in, but it works for me.