multiple CICSplexes, and so manage the enterprise CICS systems as though they belonged to more than one enterprise. 

Much of CICSPlex SM’s activity is time-dependent. For example, it can be specified that a monitor definition or an analysis definition is to be active during a particular time period. CICSPlex SM does not require every instance in a single CICSplex to be running in the same time zone, and so must be able to accommodate any time zone differences between entities. Therefore: 

GLYPH<SM590000> Whenever a time period definition (using the CICSPlex SM PERIODEF view) is created, a time zone must be specified in the definition. For example, a time period definition called MORNING can be created for the hours 08:00 through 11:59 Eastern standard time. 

GLYPH<SM590000> A time zone must be specified for each CICSPlex SM address space (CMAS) in its data repository initialization job, EYU9XDUT. A permanent change to the CICSPlex SM address space time zone value can be made, even while the CMAS is running, via the CICSPlex SM user interface. 

GLYPH<SM590000> A time zone must be established for each managed CICS system. When a CICS system is defined in a CICSPlex SM, the time zone in which the system is running can be specified. Alternatively, if no time zone is specified in the CICS system definition, the CICS system is assumed to be running in the time zone that is the default for the CICSPlex SM address space to which it connects. Allow the time zone of a managed CICS system to default to that of its CICSPlex SM address space. The time zone of a managed CICS system can be altered subsequently while the CICS system is running. Any change made in this way lasts for the lifetime of the CICS system, or until it is next changed, whichever is sooner. 

GLYPH<SM590000> A time zone must be specified for every CICSplex when it is first defined. This time zone is used by the CICSPlex SM monitor function to determine the actual time at which the monitor interval for the CICSplex expires. The CICSplex time zone can be altered via the CICSPlex SM user interface. 

Time zones are specified using single-character codes in the range B through Z. For example, code S represents Mountain Standard Time, code T represents Central Standard 

Time, and code C represents Eastern Europe Time. A complete list of the codes can be found in CICSPlex SM Setup and Administration - Volume 1. CICSPlex SM allows offsets (known as time zone adjustments) in the range 0 through 59 minutes to be specified to accommodate regions that are not running in the standard time zones. Also, daylight saving time can be specified. 

Because multiple CICSPlex SM entities require a time zone to be specified, there is obvious potential for conflicting time zones to be specified. For example, it is possible that a CMAS and a CICS instance in the same CICSplex could be in different time zones. CICSPlex SM always honors the time zone of the CICS-managed application system. Suppose the following conditions exist: 

GLYPH<SM590000>  The time period definition time zone is S. 

GLYPH<SM590000>  The CICSPlex SM address space time zone is B. 

GLYPH<SM590000>  The CICS-managed application system time zone is C. 

Time zone C is used by the CICS-managed application system, and the CMAS makes any necessary adjustments between time zones B, C, and S to ensure that the time zone is honored. 

## Manage the multiple time zone environment 

Note:  In this section, it might be preferable to use the new z/OS SET TIMEZONE command instead of the z/OS SET CLOCK command. Refer to “SET TIMEZONE” on page 88 for more information. 

