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Sets or returns the workbook's creation date. By default, CreationDate returns the spreadsheet's actual creation date. You can set CreationDate to a different date, but this will not change the creation date displayed in the spreadsheet's Properties sheet.

public System.DateTime CreationDate{ get; set; }

Public Property CreationDate() As Date

          //--- Get CreationDate
          DateTime createDate = docProps.CreationDate;

          //--- Set CreationDate
          docProps.CreationDate = new DateTime(2005, 08, 04);

          '--- Get CreationDate
          Dim createDate As DateTime = docProps.CreationDate

          '--- Set CreationDate
          docProps.CreationDate = New DateTime(2005, 08, 04)