Alert: We are in Beta until mid 2022. When you see something not working as expected, please have a look at known bugs in development and/or drop us a line. Thank you!
Property:Creation date
From tangowiki.org
"Creation date" is a predefined property that corresponds to the date of the first revision of a subject and is provided by Semantic MediaWiki. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.