DocumentSort |
SortDate can be used to sort documents by a common property date that is meaningful across document formats. For parent documents, this property is set to the PrimaryDate property value, and for child documents of non-container parent types, this property is set to the SortDate of the parent document.
See DatePrecedenceType for the metdata field precedence rules (in order of DatePrecedenceType enumeration values) used in calculating a document's SortDate.