The resource is related to a source which was originally accessed or consulted on the given date as part of creating or authoring the resource. The source(s) should be specified using pav:sourceAccessedAt. For instance, if the source accessed described the weather forecast for the next day, the time of source access can be crucial information. This property is normally used in a functional way, although PAV does not formally restrict this. If the source is subsequently checked again (say to verify validity), this should be indicated with pav:sourceLastAccessedOn. In the case multiple sources being accessed at different times or by different agents, PAV does not distinguish who accessed when what. If such details are required, they may be provided by additionally using prov:qualifiedInfluence. 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.