thanks for yr answers
some of you keep telling that calibre can't do what i want
but it's not so
I CAN do that (look at the second option in my first message)
it looks like this it the left panel:
http://piccy.info/view3/12806064/06f...ba06693cb8377/
but in order for calibre make an hierarchy like that I have to create a column with type "Comma-separated text, like tags, shown in the Tag browser."
(according to
https://manual.calibre-ebook.com/sub_groups.html)
and this custom column looks like this:
http://piccy.info/view3/12806069/9e3...21c87a58c712d/
so I can do that, but instead of autofilling date I will have to fill in in each time manually and in the format which is wierd for me
ADDED later: it seems i was wrong, it does autofils todays date when I click on this field
so part of the problem is gone
i have problem only with several hundreds books which i have read earlier and for which I will have to enter date in that strange format manually
but that is not really a big deal once there wont be such problem with future books.