In Webcenter Sites, every type of attribute is paired with a "native" editor provided by WCS which allows your entering the corresponding attribute value, even if you have not assigned an ad-hoc attribute editor to that attribute.
One of those attribute types is the "date". WCS provides a native editor which greatly simplifies your entering such an attribute's value in the right format (i.e. as expected by WCS and the underlying database) without much of a hassle.
This native editor comprises a text field where the...