It's okay.
I've been having an off day too, if that helps. But if you ever want to find out when someone was last on, go to their profile and there's a line that tells you when they last logged in.
Don't know if you knew that, but it's a good think to check when looking at people's trades. *shrugs* I'm sorry if I sound like I'm talking down to you, I'm really not. ^^;