Show HN: A JavaScript calendar for real world appointments

I made this calendar app a few years ago after being frustrated by the calendar app jQueryUI and not wanting to load jQuery for a calendar.

The calendar was designed for real world businesses to take appointments and set opening or closing hours, hence localization is implicit (based on the location of the business.

The calendar is JS plus CSS but could easily be pure JS. It uses no libraries and has no dependencies, so it is quite "plug and play".

I'm not a professional developer, but am looking to become one so any criticism of my work is more than welcome!