Mapping of Dublin Core qualified dates. Date available is defined as the Date that the resource will become or did become available. Field 307 was originally defined in the Community Information Format for hours or dates that an event or program was available or accessible. It was extended to the bibliographic format especially for electronic resources, to provide for dates associated with the availability of electronic systems and services. This mapping is appropriate for the sort of information expected.
Date created is a primary date that is used for resource discovery.
As noted above, this subfield is used for a creation date for material that is not formally published. In the current crosswalk, a mapping for this type of date has not been provided. Field 005 is used for a modification date, but this is the date the record was modified rather than the resource. It needs to be considered whether this date is an important one that needs to be identified as such, particularly for electronic resources. In general, cataloging rules call for the creation of a new record when changes are made to an item.