title: Javascript Opening hours countdown
body: <p>I would like to use an opening time countdown for individual days on my website for a local shop. The shop has opening hours from monday to friday from 09:00 to 18:00 and is open on saturdays from 10:00 to 16:30.
  I would like to show the users how long the store is open for the day they visit the website. For example a user is on the site on tuesday at 16:30 I want to display something like "Dear customer, our shop is open for another 1,5  hrs.".
  If the shop is already closed, I would like to display something like "We are currently closed, but you are welcome to visit the store on Monday at 9 o'clock.".</p>
  
  <p>I did a lot of research here and elsewhere, but i just couldn't find a proper solution for this task, so I really hope you could help me.</p>