**Steps** 1. Go to http://projekty.wojtekmaj.pl/react-calendar/ 2. On the calendar select the month of february 2018 3. Click on the last row the number 2 (For march 2nd) **The problem:** The month / date changes to March 2nd, but the button / element that has focus is March 30 and has a gray background. **Expected** The element with focus is March 2nd ( or none? )