Quick Reference: http://rs.tdwg.org/dwc/terms/index.htm#ResourceRelationship

• relationshipEstablishedDate

relationshipEstablishedDate

Quick Reference: http://rs.tdwg.org/dwc/terms/index.htm#relationshipEstablishedDate

Further explanation of the International Standards Organization standard ISO 8601 can be found at http://en.wikipedia.org/wiki/ISO_8601.