Scheduling Things on the Wrong Day

I wonder if this is a sign of getting better or backsliding?

I planned a picnic at Gallup Park for the ADHD group, date: Sunday June 13, time: 11:30 a.m. I made flyers and announced it on the meetup site. Then today, I added it to my calendar. Date: Saturday June 12, time: 11:30 a.m. Caught it right away and fixed it in my calendar.

So, does the fact that I put it in wrong mean I am not on top of things? Or does the fact that I caught it and fixed it mean that I am?

Which came first, the chicken or the egg?