The date this resource was authored. pav:authoredBy gives the authoring agent. Note that pav:authoredOn is different from pav:createdOn, although they are often the same. See pav:createdBy for a discussion. This property is normally used in a functional way, indicating the last time of authoring, although PAV does not formally restrict this. The value is of type xsd:dateTime, for instance "2013-03-26T14:49:00+01:00"^^xsd:dateTime. The timezone information (Z for UTC, +01:00 for UTC+1, etc) SHOULD be included unless unknown. If the time (or parts of time) is unknown, use 00:00:00Z. If the day/month is unknown, use 01-01, for instance, if we only know September 1983, then use "1983-09-01T00:00:00Z"^^xsd:dateTime.