This is the ".halo:creation date" template. It should be called in the following format:

{{.halo:creation date
|date values, each on a separate line
|ns:pagenames, each on a separate line
|subobject names, each on a separate line

|set property=property name (default=.halo:creation date)
|value count=max || min:max (default=0:*)
|value constraint=
}}

Best Practices:Planned facets