The worst UX I ever saw was a bunch of dates in a row of 5-7 boxes starting with Sunday (date), Monday (date), and so on. Now if you thought the “and so on” made the row look like SMTWTFS, you would be wrong. It was SMTTSMW. They had decided to only show the next available days, not showing unavailable days, but displaying it in the style of what a normal, sane person would think looked like a calendar.