POSIX-Compliant_Access_Dates_(Alpha_Only)

   To support POSIX-compliant file timestamps on ODS-5 disks, file
   attributes have been extended to include the following three
   access dates:

   o  The last access date (XAB$Q_ACC)

   o  The last attribute modification date (XAB$Q_ATT)

   o  The last data modification date (XAB$Q_MOD)

   The XABITM SENSEMODE interface can be used with the following
   item codes on $OPEN or $DISPLAY operations to sense each of these
   three access dates:

   o  XAB$_ACCDATE

   o  XAB$_ATTDATE

   o  XAB$_MODDATE

   Sensing these dates requires that access date support be
   enabled on the ODS-5 volume. (See the DCL SET VOLUME/VOLUME_
   CHARACTERISTICS command in the OpenVMS DCL Dictionary: N-Z.)

   A SETMODE can be used with a $CLOSE operation with any of these
   item codes to update these dates regardless of the volume
   setting. A user may inhibit the update of the access dates by
   using the XAB$_NORECORD XABITM.

   Each of these item codes requires a quadword buffer.

   If a SENSEMODE using any of these item codes is requested for a
   non-ODS-5 file, a zero is returned. A SETMODE using any of these
   item codes for a non-ODS-5 file will be ignored.

   These items are ignored for DECnet operations. If a SENSEMODE
   is attempted for any of these items, the user buffer is left
   unchanged.