Capability to only select a day, month, year or combination

[jaques-sam]

The problem
The datepicker has a lot of functionality but it should be simple to start from a simple picker with e.g. a day and a month only if I don't need the year. Or differently, when you only want to set a month and a year when you want to predict something that will hapen in the future (a day is just simply unneeded).

A solution
It makes sense to have a way on the datepicker to leave out the date, the month and/or the year just like you can leave out the arrow buttons.

Alternative / workaround
It feels stupid to have the same feature request where I have to create 2 drop down lists for the day & the month.