CA 1 provides expiration and retention for tape data sets through specific criteria supplied as values on the JCL EXPDT, RETPD, or ACCODE parameters. If the JCL does not supply either value, the CA 1 Default Retention (CA 1 system option RP) is assigned when the data set is opened.
You can optionally establish retention in batch program TMSEXPDT or the Real-time Expiration feature using the CA 1 Retention Data Set.
CA 1 does treat certain Julian dates as EXPDT keywords with special retention characteristics. They are expressed in Julian format in JCL and in a special keyword format to CA 1 batch utilities.
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