DateFormPr
type DateFormPr = FormPrBase | DateFormPrBaseDescription
Date form properties.
Try It
var oDateFormPr = {"key": "Nowadays", "tip": "Enter current date", "required": true, "placeholder": "Your date here", "format": "mm.dd.yyyy", "lang": "en-US"};
var oDateForm = Api.CreateDateForm(oDateFormPr);