Default dates and times are returned in the time zone of the DFSMSrmm system processing the subcommand. The TZ SFI provides the time zone offset so if necessary, the application can convert dates and times to any other required time zone. When issuing subcommands that specify date or time values, such as ADDDATASET or CHANGEVOLUME, you can specify the TZ operand to indicate to the DFSMSrmm system the time zone offset the application is using. DFSMSrmm converts dates and times to UTC/GMT/local time in order to store them in the DFSMSrmm control data set. Refer to z/OS DFSMSrmm Implementation and Customization Guide for more information on creating or updating the DFSMSrmm control data set control record and setting up DFSMSrmm common time support.