Calendar View for Daily Cards#328

I would like to have a date picker for creating a daily card. I would like to be able to create not only a daily card for today, but for any day. Furthermore, there should be only one “real” daily card for each date to avoid confusion. These daily cards should be selectable via the date picker.

Ideally, you should also be able to select this date picker via the slash commands to assign a card to a specific date.