for me I do it slightly diffrently, it's not good/ bad experiences, I base it on what I am (or not) doing that day

like for me: how was my previous night

have I eaten today

have I drank enough

have I got much on?

how is my chronic pain

all that information helps me know if I'm having a good day or not

I could be having a really bad day and then listen to one of my favorite songs, but it wouldn't make a diffrence- the day's still bad

today is bad: I spent the night reliving abuse, I have horrible chronic pain in my back, I have nothing planned (accept for being on here and checking emails), and all I've eaten of any use is a few grapes.