The property namespace is disabled, attempting to declare a type or other property specific characteristics for this property is not possible.
"Date" is a type and predefined property provided by Semantic MediaWiki to represent date values. 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.
Date uses an ISO 8601 date standard. For example: 1958-02-17 formats to 1958-02-17.