(1) In DFSMSrmm, the date that a data set is written to tape.
(2) The date that a data set was read if it was created before DFSMSrmm was in use. The create date is updated each time a data set is replaced and not extended.
(3) The date that volumes and other resources are defined to DFSMSrmm or the date specified on the command as the create date.