Anika. I have a terrible sense of time. And yes, "even" looking at the calendar... me too. It can be sooo disconcerting. I have a calendar that is on the desk in front of the laptop. I cross off days, use highlighter around anything I have to go to and still miss stuff. Heck, it's not even unusual for me to be mentally off by months(!) Like others, I also use my cell phone and will set it for two times. One, "get up" or "get ready" and a second one for "actually go". Before I got in this habit, I'd keep thinking, "remember, remember, remember" over and over all day. Then shortly before that time, zooop! Totally space it. If the phone needs to wake me up, I also put a sticky on it to remember why it is going off. Yup.

I rarely know what day of the week it is (without checking anyway, and still can get mixed up).

Appointments. Have shown up wrong time, wrong day, wrong week. You name it. It's embarrasing, but... guess at least that it's not for lack of trying.
So, yeah... hear ya, Anika

(And I can't even blame meds, I've always been "time oblivious".)