Add 'clear date' option?

[davoutuk]

Can I suggest adding a 'clear date' option to your date picker?

This could be implemented in several ways: 1). A 'clear date' button placed to the right of the date_field widget 2). A 'clear date' button in the pop up date selector form

Both of these could be enacted by a new 'allowClearDate' property

[torbenkeller]

This got implemented with the ^4.0.0 release