Can't find element for Date Picker when building formula for a collection request

Hi,

I am trying to map form fields into a Retrieve collection. The form has 3 fields - a Date Picker, a Text field and an Autocomplete. I can see mappings for the Text field and the Autocomplete fields but not the Date Picker.

I have also noticed that while the Text field and the Autocomplete have fieldnames, the Date Picker does not.

How can I get this done?

Thanks