For pre-filling the date field via URL parameters, the Field code can be found under the Advanced properties.
The date input field has 2 supported attributes. Date and time.
To pre-fill these attributes, you can use the field code along with the attribute.
date_input.date (Should be in YYYY-MM-DD format)
date_input.time (Can be in HH:mm: ss or HH: mm or HH format.)
Using the above, we can append the URL parameters to the form's URL:
https://example.neetoform.com/8abc2aa31ef7d12f288e?date_input.date=2023-09-12&date_input.time=21:12:12