Time zones

IBM Z Workload Scheduler can support several z/OS® systems. The tracker collects information about activity on the z/OS system it supports, such as when a job has started, or when a print has been processed. This information is recorded in an event record and sent to the controlling system. Each event contains a time stamp, which records the date and time that the event record was created.

The systems that IBM Z Workload Scheduler supports might be in different time zones. The event record contains a field that specifies the difference between the local time of the system that collected the record and Greenwich mean time (GMT). This time difference is automatically calculated and placed in event records. If you intend to change the local clock GMT offset by using the z/OS SET CLOCK command, all IBM Z Workload Scheduler systems running on the affected z/OS should be shut down and then restarted after the SET CLOCK command has been issued. The GMT offset is stored when the subsystem is started.

To avoid shutting down and restarting the IBM Z Workload Scheduler systems for daylight savings time, set record 90 in member SMFPRMxx of the SYS1.PARMLIB. At daylight savings time, the time is updated automatically. For more information, see Updating SMF parameters in Planning and Installation.

The controller processes event records from all the systems in your IBM Z Workload Scheduler complex. Because all event records contain a local time difference field, the controller can convert time stamps to the local time of the controlling system. This is necessary because all time values stored in IBM Z Workload Scheduler databases and data sets are expressed in the local time of the controlling system.

Time values appearing printed reports are also expressed in the local time of the IBM Z Workload Scheduler controlling processor.