How does total time logged in works? I think I've been logged in way longer than what it is showing above on the left side.
It's just your 'active' browsing time on the forum. I don't know how accurate it is though.
And also, is there a way to see on which date I registered here at bitcointalk forum, I want to see how many days I've been registered here. Does it tell somewhere on the profile section, or do I have to count it manually?
It's in your profile: May 30, 2017, 02:39:05 PM. Surely you could have figured this out for yourself.