Choose link/share expiration based on time span instead of calendar

[kulmann]

Description

Some users prefer selecting the expiry date of a link or share based on a validity duration (e.g. 30 days) instead of finding the appropriate date in the calendar.

User Stories

• As a user, I want to define an expiry of a link or share by a number of days so that I don't have to calculate in my head a date from the current date + a certain amount of days or weeks.

Value

Fast expiry input without cognitive load.

Acceptance Criteria

• user can decide in preferences whether they want to enter expiry dates by number of days or by calendar input
• any place where an expiration date can be picked now adheres to this preference

Definition of ready

• [ ] Everybody needs to understand the value written in the user story
• [ ] Acceptance criteria have to be defined
• [ ] All dependencies of the user story need to be identified
• [ ] Feature should be seen from an end user perspective
• [ ] Story has to be estimated
• [ ] Story points need to be less than 20

Definition of done

• Functional requirements
  • [ ] Functionality described in the user story works
  • [ ] Acceptance criteria are fulfilled
• Quality
  • [ ] Code review happened
  • [ ] CI is green (that includes new and existing automated tests)
  • [ ] Critical code received unit tests by the developer
• Non-functional requirements
  • [ ] No sonar cloud issues

[kulmann]

cc @tbsbdr @dj4oC

[AlexAndBear]

Thanks for opening the ticket, even if we want to add this setting. For the current date picker itself, I'd still like to show the relative date: this is tackled by https://github.com/owncloud/web/pull/11534