Good timing on this thread.
I've been out with girls, only to later learn that they thought it was a date. And then, I've gone out, and I thought it was a date and they didn't.
For example, very recently, I spent two consecutive nights with a girl who I've known for 4 months (after she broke up with her boyfriend and clearly told me that she wanted to go out with me).
I paid for everything on both nights. We ended up kissing both nigths.
Yet she told my friend that I still have to ask her out, which I did on Valentine's Day while we were in my bed 🙂
My date-test:
1. Did you pay?
2. How did the night end?
3. Were you both single at the time?