Date Picker - JavaScript API

Is your feature request related to a problem? Please describe.
Selecting a date in the Command Bar is difficult as we can’t select a date and we don’t know if the the natural language input is valid while typing.

Describe the solution you'd like
From the Command Bar API, request to show a date picker for the user to select a date.
It would be ideal to have a top area where I can time in natural language "3 months", "in 2 weeks" etc, and a lower area with the more normal kind of calendar view. If the top part is used, then the lower view updates.

Describe alternatives you've considered
The alternative is to use a callback function so we can change the results while the user types a date.