Time zone issue in schedules

[rimi-itk]

Link to ticket

https://leantime.itkdev.dk/#/tickets/showTicket/872

Description

• Fixes – hopefully – time zone issues in playlist schedules.
• Cleans up documentation.

This has been tested in numerous time zones – all from the comfort of my couch.

Checklist

• My code is covered by test cases.
• My code passes our test (all our tests).
• My code passes our static analysis suite.
• My code passes our continuous integration process.

If your code does not pass all the requirements on the checklist you have to add a comment explaining why this change
should be exempt from the list.