8480ch03.fm Draft Document for Review January 6, 2020 11:24 pm 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. 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 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: 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. 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. Manage the multiple time zone environment Chapter 3. Configuration and operations  93