Editor Question

Hi,

In our Editor instance, when someone clicks 'New', in the modal is like:

label1:  textbox
label2:  textbox
label3:  textbox
label4:  textbox

but I also want to add at the end

date:   YYYY-MM-YY

but for Editor to automatically fill it in with a real YYYY-MM-YY, but also allow the user to change it if need be.

Is it possible? :)