This happened to me once. I thought my appointment was on Friday 24th. I was in the procress of having my hair done when my therapist called. She said, "We had an appointment at 2:00 today." By now it was 15 minutes past that time. I was like, "No, it is the tomorrow the 24th."

She clairfied for me that the 24th was on a THURSDAY not a FRIDAY as I had thought. I was so upset thinking I had missed my time for that week. She graciously offered me a time the next day. It went over okay. Session went well, so I didn't get burned too bad by it.