A user setting to define office hours for calendar scheduling

[ChristophWurst]

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Is your feature request related to a problem? Please describe.

The Nextcloud CalDAV back-end has some powerful scheduling capabilities that help schedule meetings with participants and resources. Especially in teams with people across multiple time zones it becomes tricky to find time slots that not only don't have blocked slots but also fall into the office hours of all individuals.

Describe the solution you'd like

Add a user setting where one can define the usual office ours (~availability). This can be a simple 9-5 Mo-Fr or more complicated. I took a look at Google Calendar for comparison and they allow you to pick which of the seven weekdays you are available and then you'll have to select at least one slot for each of those days. This will cover the majority of availabilities and should be reasonable to do as a UI. In the end we have to translate this into a recurrence rule for DAV and back when the UI is rendered.

Describe alternatives you've considered

Have the UI in Calendar. This is fine for those who use the Calendar app, but any one who uses Thunderbird instead won't have the option to ever make use of this feature if Calendar is not installed. Therefore I would rather have the UI in server.

Additional context

• This will require Not all custom DAV properties should be scoped to a user #27421

[ChristophWurst]

I kicked this off with a UI prototype: #27466

[tcitworld]

Should we add default values (both in the backend and the UI)?

[ChristophWurst]

Something like a fallback availability that an admin can set, e.g. the infamous Mo-Fr 9-5, and users can the overwrite? We could do that, but I'd leave it opt-in.

One important factor for the working hours is a user's timezone. We'll also need a setting for that. Without time zone you can't have a decent fallback for the hours, can you?

[ChristophWurst]

Another slight related topic could be for users to pick certain public holiday that then count towards availability.

[tcitworld]

Related to nextcloud/calendar#962 then